LTC5591 Dual 1.3GHz to 2.3GHz High Dynamic Range Downconverting Mixer Description Features n n n n n n n n n n n n n n Conversion Gain: 8.5dB at 1950MHz IIP3: 26.2dBm at 1950MHz Noise Figure: 9.9dB at 1950MHz 15.5dB NF Under 5dBm Blocking High Input P1dB 47dB Channel-to-Channel Isolation 1.25W Power Consumption at 3.3V Low Power Mode: <800mW Consumption Independent Channel Shutdown Control 50 Single-Ended RF and LO Inputs LO Input Matched In All Modes 0dBm LO Drive Level Small Package and Solution Size -40C to 105C Operation The LTC(R)5591 is part of a family of dual-channel high dynamic range, high gain downconverting mixers covering the 600MHz to 4.5GHz RF frequency range. The LTC5591 is optimized for 1.3GHz to 2.3GHz RF applications. The LO frequency must fall within the 1.4GHz to 2.1GHz range for optimum performance. A typical application is a LTE or W-CDMA multichannel or diversity receiver with a 1.7GHz to 2.2GHz RF input and low side LO. The LTC5591's high conversion gain and high dynamic range enable the use of lossy IF filters in high selectivity receiver designs, while minimizing the total solution cost, board space and system-level variation. A low current mode is provided for additional power savings and each of the mixer channels has independent shutdown control. High Dynamic Range Dual Downconverting Mixer Family Applications PART NUMBER RF RANGE LO RANGE LTC5590 600MHz to 1.7GHz 700MHz to 1.5GHz LTC5591 1.3GHz to 2.3GHz 1.4GHz to 2.1GHz LTC5592 1.6GHz to 2.7GHz 1.7GHz to 2.5GHz LTC5593 2.3GHz to 4.5GHz 2.1GHz to 4.2GHz 3G/4G Wireless Infrastructure Diversity Receivers (LTE, W-CDMA, TD-SCDMA, UMTS, GSM1800) n Remote Radio Unit n MIMO Multichannel Receivers n L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Typical Application Wideband Receiver 190MHz SAW VCCIF 3.3V or 5V 1F 22pF + IFA LNA IFA RFA 150nH 22pF 4.7pF SYNTH IF AMP 8.0 6.5 6.0 160 VCCB VCC 22pF 150nH 1nF 8.5 7.0 ENB (0V/3.3V) BIAS IFB- 9.0 26 IIP3 LO = 1760MHz PLO = 0dBm RF = 1950 30MHz TEST CIRCUIT IN FIGURE 1 24 22 20 18 GC 16 14 7.5 ENB IFB+ VCCIF LO LO AMP RFB 10.5 9.5 LO 1760MHz 28 11.0 ENA (0V/3.3V) ENA LO AMP LNA VCC 3.3V 1F 10.0 BIAS IMAGE BPF 2.7pF RF 1920MHz TO 1980MHz 22pF VCCA - IF AMP ADC 1nF 190MHz SAW IIP3 (dBm), SSB NF (dB) IMAGE BPF 2.7pF RF 1920MHz TO 1980MHz IF AMP 1nF 150nH 150nH Wideband Conversion Gain, IIP3 and NF vs IF Frequency (Mixer Only, Measured on Evaluation Board) 190MHz BPF GC (dB) 1nF 12 NF 10 210 180 170 200 190 IF OUTPUT FREQUENCY (MHz) 8 220 5591 TA01b 190MHz BPF IF AMP ADC 5591 TA01a 5591f 1 LTC5591 Absolute Maximum Ratings Pin Configuration (Note 1) Supply Voltage (VCC)................................................4.0V IF Supply Voltage (VCCIF)..........................................5.5V Enable Voltage (ENA, ENB)...............-0.3V to VCC + 0.3V Bias Adjust Voltage (IFBA, IFBB)..........-0.3V to VCC + 0.3V Power Select Voltage (ISEL) .............-0.3V to VCC + 0.3V LO Input Power (1GHz to 3GHz)..............................9dBm LO Input DC Voltage................................................ 0.1V RFA, RFB Input Power (1GHz to 3GHz).................15dBm RFA, RFB Input DC Voltage..................................... 0.1V Operating Temperature Range (TC)......... -40C to 105C Storage Temperature Range................... -65C to 150C Junction Temperature (TJ)..................................... 150C VCCA IFBA IFA- IFA+ IFGNDA GND TOP VIEW 24 23 22 21 20 19 RFA 1 18 ISEL CTA 2 17 ENA GND 3 16 LO 25 GND GND 4 15 GND 13 GND IFBB VCCB 9 10 11 12 IFB- 8 IFB+ 7 GND 14 ENB RFB 6 IFGNDB CTB 5 UH PACKAGE 24-LEAD (5mm x 5mm) PLASTIC QFN TJMAX = 150C, JC = 7C/W EXPOSED PAD (PIN 25) IS GND, MUST BE SOLDERED TO PCB Order Information LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE LTC5591IUH#PBF LTC5591IUH#TRPBF 5591 24-Lead (5mm x 5mm) Plastic QFN -40C to 105C Consult LTC Marketing for parts specified with wider operating temperature ranges. Consult LTC Marketing for information on non-standard lead based finish parts. For more information on lead free part marking, go to: http://www.linear.com/leadfree/ For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/ V DC Electrical Characteristics CC = 3.3V, VCCIF = 3.3V, ENA = ENB = High, ISEL = Low, TC = 25C, unless otherwise noted. Test circuit shown in Figure 1. (Note 2) PARAMETER CONDITIONS MIN TYP MAX UNITS VCCA, VCCB Supply Voltage (Pins 12, 19) 3.1 3.3 3.5 V VCCIFA, VCCIFB Supply Voltage (Pins 9, 10, 21, 22) 3.1 3.3 5.3 V Power Supply Requirements (VCCA, VCCB, VCCIFA, VCCIFB) Mixer Supply Current (Pins 12, 19) Both Channels Enabled 182 218 mA IF Amplifier Supply Current (Pins 9, 10, 21, 22) Both Channels Enabled 200 240 mA Total Supply Current (Pins 9, 10, 12, 19, 21, 22) Both Channels Enabled 382 458 mA Total Supply Current - Shutdown ENA = ENB = Low 500 A Enable Logic Input (ENA, ENB) High = On, Low = Off ENA, ENB Input High Voltage (On) 2.5 V ENA, ENB Input Low Voltage (Off) ENA, ENB Input Current -0.3V to VCC + 0.3V -20 0.3 V 30 A Turn On Time 0.9 s Turn Off Time 1 s 5591f 2 LTC5591 V DC Electrical Characteristics CC = 3.3V, VCCIF = 3.3V, ENA = ENB = High, ISEL = Low, TC = 25C, unless otherwise noted. Test circuit shown in Figure 1. (Note 2) PARAMETER CONDITIONS MIN TYP MAX UNITS Low Current Mode Logic Input (ISEL) High = Low Power, Low = Normal Power Mode ISEL Input High Voltage 2.5 V ISEL Input Low Voltage ISEL Input Current -0.3V to VCC + 0.3V -20 0.3 V 30 A Low Current Mode Current Consumption (ISEL = High) Mixer Supply Current (Pins 12, 19) Both Channels Enabled 119 143 mA IF Amplifier Supply Current (Pins 9, 10, 21, 22) Both Channels Enabled 120 144 mA Total Supply Current (Pins 9, 10, 12, 19, 21, 22) Both Channels Enabled 239 287 mA V AC Electrical Characteristics CC = 3.3V, VCCIF = 3.3V, ENA = ENB = High, ISEL = Low, TC = 25C, PLO = 0dBm, PRF = -3dBm (f = 2MHz for two tone IIP3 tests), unless otherwise noted. Test circuit shown in Figure 1. (Notes 2, 3, 4) PARAMETER CONDITIONS MIN LO Input Frequency Range TYP MAX UNITS 1400 to 2100 MHz 1600 to 2300 1300 to 1800 MHz MHz 5 to 500 MHz RF Input Frequency Range Low Side LO High Side LO IF Output Frequency Range Requires External Matching RF Input Return Loss ZO = 50, 1300MHz to 2300MHz >12 dB LO Input Return Loss ZO = 50, 1400MHz to 2100MHz >12 dB IF Output Impedance Differential at 190MHz 300||2.3pF R||C LO Input Power fLO = 1400MHz to 2100MHz -4 0 6 dBm LO to RF Leakage fLO = 1400MHz to 2100MHz <-30 dBm LO to IF Leakage fLO = 1400MHz to 2100MHz <-30 dBm RF to LO Isolation fRF = 1300MHz to 2300MHz >45 dB RF to IF Isolation fRF = 1300MHz to 2300MHz >30 dB Channel-to-Channel Isolation fRF = 1750MHz to 2150MHz >47 dB Low Side LO Downmixer Application: ISEL = Low, RF = 1700MHz to 2300MHz, IF = 190MHz, fLO = fRF - fIF PARAMETER CONDITIONS MIN TYP Conversion Gain RF = 1750MHz RF = 1950MHz RF = 2150MHz 7.0 8.7 8.5 8.0 dB dB dB Conversion Gain Flatness RF = 1950 30MHz, LO = 1760MHz, IF = 190 30MHz 0.25 dB -0.006 dB/C 26.9 26.2 26.2 dBm dBm dBm 9.4 9.9 10.8 dB dB dB Conversion Gain vs Temperature TC = -40C to 105C, RF = 1950MHz Input 3rd Order Intercept RF = 1750MHz RF = 1950MHz RF = 2150MHz SSB Noise Figure RF = 1750MHz RF = 1950MHz RF = 2150MHz 24.0 MAX UNITS 5591f 3 LTC5591 V AC Electrical Characteristics CC = 3.3V, VCCIF = 3.3V, ENA = ENB = High, TC = 25C, PLO = 0dBm, PRF = -3dBm (f = 2MHz for two tone IIP3 tests), unless otherwise noted. Test circuit shown in Figure 1. (Notes 2, 3) Low Side LO Downmixer Application: ISEL = Low, RF = 1700MHz to 2300MHz, IF = 190MHz, fLO = fRF - fIF PARAMETER CONDITIONS MIN SSB Noise Figure Under Blocking fRF =1950MHz, fLO = 1760MHz, fBLOCK = 2050MHz, PBLOCK = 5dBm PBLOCK = 10dBm 2RF-2LO Output Spurious Product (fRF = fLO + fIF/2) TYP MAX UNITS 15.5 20.2 dB dB fRF = 1855MHz at -10dBm, fLO = 1760MHz, fIF = 190MHz -69 dBc 3RF-3LO Output Spurious Product (fRF = fLO + fIF/3) fRF = 1823.33MHz at -10dBm, fLO = 1760MHz, fIF = 190MHz -74 dBc Input 1dB Compression fRF = 1950MHz, VCCIF = 3.3V fRF = 1950MHz, VCCIF = 5V 10.7 13.9 dBm dBm Low Power Mode, Low Side LO Downmixer Application: ISEL = High, RF = 1700MHz to 2300MHz, IF = 190MHz, fLO = fRF - fIF PARAMETER CONDITIONS Conversion Gain RF = 1950MHz MIN TYP 7.2 MAX UNITS dB Input 3rd Order Intercept RF = 1950MHz 21.4 dBm SSB Noise Figure RF = 1950MHz 10.3 dB Input 1dB Compression RF = 1950MHz, VCCIF = 3.3V RF = 1950MHz, VCCIF = 5V 10.7 11.7 dBm dBm High Side LO Downmixer Application: ISEL = Low, RF = 1300MHz to 1800MHz, IF = 190MHz, fLO = fRF + fIF PARAMETER CONDITIONS MIN TYP MAX UNITS Conversion Gain RF = 1450MHz RF = 1600MHz RF = 1750MHz 8.9 8.6 8.4 dB dB dB Conversion Gain Flatness RF = 1600 30MHz, LO = 1790MHz, IF = 190 30MHz 0.1 dB Conversion Gain vs Temperature TC = -40C to 105C, RF = 1600MHz -0.007 dB/C Input 3rd Order Intercept RF = 1450MHz RF = 1600MHz RF = 1750MHz 25.0 24.6 24.3 dBm dBm dBm SSB Noise Figure RF = 1450MHz RF = 1600MHz RF = 1750MHz 10.0 10.1 10.1 dB dB dB SSB Noise Figure Under Blocking fRF = 1600MHz, fLO = 1790MHz, fBLOCK = 1500MHz, PBLOCK = 5dBm PBLOCK = 10dBm 16.4 21.2 dB dB 2LO-2RF Output Spurious Product (fRF = fLO - fIF/2) fRF = 1695MHz at -10dBm, fLO = 1790MHz, fIF = 190MHz -64 dBc 3LO-3RF Output Spurious Product (fRF = fLO - fIF/3) fRF = 1726.67MHz at -10dBm, fLO = 1790MHz, fIF = 190MHz -75 dBc Input 1dB Compression RF = 1600MHz, VCCIF = 3.3V RF = 1600MHz, VCCIF = 5V 10.2 13.6 dBm dBm Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime. Note 2: The LTC5591 is guaranteed functional over the case operating temperature range of -40C to 105C. (JC = 7C/W) Note 3: SSB Noise Figure measured with a small-signal noise source, bandpass filter and 6dB matching pad on RF input, bandpass filter and 6dB matching pad on the LO input, and no other RF signals applied. Note 4: Channel A to channel B isolation is measured as the relative IF output power of channel B to channel A, with the RF input signal applied to channel A. The RF input of channel B is 50 terminated and both mixers are enabled. 5591f 4 LTC5591 Typical AC Performance Characteristics Low Side LO VCC = 3.3V, VCCIF = 3.3V, ENA = ENB = High, ISEL = Low, TC = 25C, PLO = 0dBm, PRF = -3dBm (-3dBm/tone for two-tone IIP3 tests, f = 2MHz), IF = 190MHz, unless otherwise noted. Test circuit shown in Figure 1. Conversion Gain and IIP3 vs RF Frequency 14 14 12 -40C 25C 85C 10 105C 12 IIP3 23 GC 19 17 1.6 2.3 1.7 1.8 1.9 2 2.1 2.2 RF FREQUENCY (GHz) 55 -40C 25C 85C 105C 50 10 8 8 6 2.4 6 1.6 2.3 1.7 1.8 1.9 2 2.1 2.2 RF FREQUENCY (GHz) 5591 G01 27 21 25 19 -40C 16 25C 85C 14 23 -40C 16 25C 85C 14 23 6 GC -4 2 -2 0 LO INPUT POWER (dBm) 6 4 21 19 10 15 8 13 6 4 11 2 9 0 7 GC -6 -4 2 -2 0 LO INPUT POWER (dBm) 6 4 Conversion Gain, IIP3 and NF vs Supply Voltage (Single Supply) 19 9 -40C 7 25C 85C 5 4 11 2 9 0 7 Conversion Gain, IIP3 and NF vs IF Supply Voltage (Dual Supply) 25 -40C 18 25C 85C 16 23 10 13 8 11 9 7 3 3.1 3.4 3.2 3.3 3.5 VCC, VCCIF SUPPLY VOLTAGE (V) 19 18 16 14 17 12 NF 15 10 13 8 11 4 9 2 3.6 7 5591 G07 RF = 1950MHz VCC = 3.3V 21 6 GC -40C 25C 85C 6 GC 3 3.3 4 3.6 3.9 4.2 4.5 4.8 5.1 VCCIF SUPPLY VOLTAGE (V) 2 5.4 5591 G08 SSB NF (dB) 12 NF 15 SSB NF (dB) 14 IIP3 GC (dB), IIP3 (dBm), P1dB (dBm) 27 20 GC (dB), IIP3 (dBm) 22 25 17 -6 -4 3 2 -2 0 LO INPUT POWER (dBm) 4 6 1 Conversion Gain, IIP3 and RF Input P1dB vs Temperature 27 19 GC 5591 G06 22 RF = 1950MHz VCC = VCCIF 11 13 20 21 13 NF 15 25 IIP3 15 17 27 23 17 21 5591 G05 5591 G04 GC (dB), IIP3 (dB) 12 NF 17 IIP3 SSB NF (dB) 10 IIP3 SSB NF (dB) 12 13 -6 2150MHz Conversion Gain, IIP3 and NF vs LO Power 20 8 7 5591 G03 18 15 9 2.4 25 NF 11 2.3 1.8 1.9 2.1 2.2 2 RF FREQUENCY (GHz) 27 GC (dB), IIP3 (dB) 21 1.6 1.7 20 SSB NF (dB) GC (dB), IIP3(dB) 23 -40C 25C 85C 105C 18 IIP3 19 30 2.4 1950MHz Conversion Gain, IIP3 and NF vs LO Power 27 17 40 5591 G02 1750MHz Conversion Gain, IIP3 and NF vs LO Power 25 45 35 GC (dB), IIP3 (dB) 21 SSB NF (dB) IIP3 (dBm) 16 GC (dB) 16 ISOLATION (dB) 27 25 Channel Isolation vs RF Frequency SSB NF vs RF Frequency 23 IIP3 RF = 1950MHz VCCIF = 5V VCCIF = 3.3V 21 19 17 15 13 P1dB 11 9 GC 7 -40 -25 -10 5 20 35 50 65 80 95 110 CASE TEMPERATURE (C) 5591 G09 5591f 5 LTC5591 Typical AC Performance Characteristics Low Side LO (continued) VCC = 3.3V, VCCIF = 3.3V, ENA = ENB = High, ISEL = Low, TC = 25C, PLO = 0dBm, PRF = -3dBm (-3dBm/tone for two-tone IIP3 tests, f = 2MHz), IF = 190MHz, unless otherwise noted. Test circuit shown in Figure 1. Single-Tone IF Output Power, 2 x 2 and 3 x 3 Spurs vs RF Input Power 20 20 10 10 IFOUT -40 -50 IM3 -60 -80 -12 -30 3RF-3LO (RF = 1823.33MHz) -40 -50 2RF-2LO (RF = 1855MHz) -60 IM5 -70 (LO = 1760MHz) -20 -80 3 -15 -12 -9 -6 -3 0 6 RF INPUT POWER (dBm) 6 5591 G10 9 -80 12 -6 LO LEAKAGE (dBm) PLO = -3dBm PLO = 0dBm 12 RF-LO 50 LO-RF -40 LO-IF 45 40 RF-IF 35 PLO = 3dBm 8 -25 -20 -60 -15 -10 -5 0 5 RF BLOCKER POWER (dBm) 10 1.2 1.4 2 1.6 1.8 LO FREQUENCY (GHz) Conversion Gain Distribution 25 -40C 25C 85C 25 RF = 1950MHz 20 DISTRIBUTION (%) 15 10 1.5 1.7 1.9 2.1 RF FREQUENCY (GHz) 2.3 2.5 -40C 25C 85C SSB Noise Figure Distribution 40 RF = 1950MHz RF = 1950MHz 35 -40C 25C 85C 30 15 10 25 20 15 10 5 5 1.3 5591 G15 IIP3 Distribution 20 0 7.8 30 2.2 5591 G14 5591 G13 30 6 RF Isolation vs RF Frequency -50 10 -2 0 2 4 LO INPUT POWER (dBm) 55 -30 16 -4 5591 G12 LO Leakage vs LO Frequency RF = 1950MHz LO = 1760MHz 20 BLOCKER = 2050MHz 14 3RF-3LO (RF = 1823.33MHz) -75 -20 22 SSB NF (dB) -70 5591 G11 SSB Noise Figure vs RF Blocker Power DISTRIBUTION (%) 2RF-2LO (RF = 1855MHz) -70 -9 3 -6 -3 0 RF INPUT POWER (dBm/TONE) 18 RF = 1950MHz PRF = -10dBm LO = 1760MHz -65 ISOLATION (dB) -30 -10 DISTRIBUTION (%) -20 -60 IFOUT (RF = 1950MHz) 0 RF1 = 1949MHz RF2 = 1951MHz LO = 1760MHz 2 x 2 and 3 x 3 Spurs vs LO Power RELATIVE SPUR LEVEL (dBc) 0 -10 OUTPUT POWER (dBm) OUTPUT POWER/TONE (dBm) 2-Tone IF Output Power, IM3 and IM5 vs RF Input Power 5 8.0 8.2 8.4 8.6 8.8 CONVERSION GAIN (dB) 9.0 5591 G16 0 23.7 24 24.3 24.6 24.9 25.2 25.5 25.8 26.1 26.4 26.7 IIP3 (dBm) 5591 G17 0 8.5 8.9 9.3 9.7 10.1 10.5 10.9 11.3 11.7 SSB NOISE FIGURE (dB) 5591 G18 5591f 6 LTC5591 Typical AC Performance Characteristics Low Power Mode, Low Side LO VCC = 3.3V, VCCIF = 3.3V, ENA = ENB = High, ISEL = High, TC = 25C, PLO = 0dBm, PRF = -3dBm (-3dBm/tone for two-tone IIP3 tests, f = 2MHz), IF = 190MHz, unless otherwise noted. Test circuit shown in Figure 1. Conversion Gain and IIP3 vs RF Frequency Channel Isolation vs RF Frequency SSB NF vs RF Frequency 23 21 15 16 55 13 14 50 11 12 9 13 1.6 1.7 1.8 1.9 2 2.1 2.2 RF FREQUENCY (GHz) 10 7 8 5 2.3 2.4 6 15 ISOLATION (dB) GC -40C 25C 85C 105C 1.6 1.7 1.8 1.9 2 2.1 2.2 RF FREQUENCY (GHz) 2.3 1750MHz Conversion Gain, IIP3 and NF vs LO Power 18 22 16 -40C 14 25C 85C 12 IIP3 24 18 22 20 16 18 -40C 14 25C 85C 12 20 NF 16 14 10 12 8 10 6 10 6 8 4 8 4 8 2 6 2 6 0 4 0 4 -6 -4 2 -2 0 LO INPUT POWER (dBm) 6 4 GC -6 -4 2 -2 0 LO INPUT POWER (dBm) Conversion Gain, IIP3 and NF vs Supply Voltage (Single Supply) IIP3 18 24 18 22 16 20 14 14 10 12 8 10 GC 8 6 3 -40C 25C 6 85C 4 3.1 3.4 3.2 3.3 3.5 VCC, VCCIF SUPPLY VOLTAGE (V) 2 3.6 5591 G25 16 14 NF 12 10 12 10 GC NF 26 18 24 14 12 10 14 12 10 GC 8 6 20 16 RF = 1950MHz VCC = 3.3V 16 3 3.3 -40C 25C 85C 8 6 4 3.6 3.9 4.2 4.5 4.8 5.1 VCCIF SUPPLY VOLTAGE (V) 6 4 2 -6 -4 2 -2 0 LO INPUT POWER (dBm) 6 4 0 Conversion Gain, IIP3 and RF Input P1dB vs Temperature IIP3 18 8 -40C 25C 85C 5591 G24 2 5.4 5591 G26 SSB NF (dB) 12 SSB NF (dB) NF 16 RF = 1950MHz VCC = VCCIF 20 GC (dB), IIP3 (dBm) 22 18 14 Conversion Gain, IIP3 and NF vs IF Supply Voltage (Dual Supply) 24 20 6 4 20 5591 G23 5591 G22 2.4 16 8 4 2.3 IIP3 18 12 GC (dB), IIP3 (dBm) P1dB (dBm) GC (dB), IIP3 (dBm) 20 IIP3 10 GC 1.8 1.9 2 2.1 2.2 RF FREQUENCY (GHz) 2150MHz Conversion Gain, IIP3 and NF vs LO Power 14 6 GC (dB), IIP3 (dBm) 1.6 1.7 5591 G21 SSB NF (dB) GC (dB), IIP3 (dBm) 22 NF 30 2.4 SSB NF (dB) 24 SSB NF (dB) 20 16 -40C 25C 85C 105C 1950MHz Conversion Gain, IIP3 and NF vs LO Power 24 18 40 5591 G20 5591 G19 20 45 35 GC (dB), IIP3 (dBm) 17 -40C 25C 85C 105C SSB NF (dB) 19 GC (dB) IIP3 (dBm) IIP3 22 IIP3 20 RF = 1950MHz VCCIF = 5V VCCIF = 3.3V 18 16 14 12 P1dB 10 8 GC 6 -40 -25 -10 5 20 35 50 65 80 95 110 CASE TEMPERATURE (C) 5591 G27 5591f 7 LTC5591 Typical AC Performance Characteristics High Side LO VCC = 3.3V, VCCIF = 3.3V, ENA = ENB = High, ISEL = Low, TC = 25C, PLO = 0dBm, PRF = -3dBm (-3dBm/tone for two-tone IIP3 tests, f = 2MHz), IF = 190MHz, unless otherwise noted. Test circuit shown in Figure 1. Conversion Gain and IIP3 vs RF Frequency 2-Tone IF Output Power, IM3 and IM5 vs RF Input Power SSB NF vs RF Frequency 16 16 24 14 14 20 18 10 1.35 12 10 6 1.25 6 1.85 1.45 1.55 1.65 1.75 RF FREQUENCY (GHz) -10 RF1 = 1599MHz RF2 = 1601MHz LO = 1790MHz -20 -30 -40 -50 IM3 -60 -70 IM5 1.35 1.45 1.55 1.65 1.75 RF FREQUENCY (GHz) -90 -12 1.85 0 -9 -6 0 -3 RF INPUT POWER (dBm/TONE) 5591 G29 1450MHz Conversion Gain, IIP3 and NF vs LO Power 3 5591 G30 1750MHz Conversion Gain, IIP3 and NF vs LO Power 1600MHz Conversion Gain, IIP3 and NF vs LO Power 26 18 24 16 22 16 22 14 20 14 20 14 18 12 16 10 IIP3 20 12 NF 10 14 8 -40C 25C 6 85C 4 8 6 GC -6 -4 2 -2 0 LO INPUT POWER (dBm) 6 4 12 10 14 8 NF -40C 25C 6 85C 4 12 10 GC 8 2 8 6 0 6 -4 2 -2 0 LO INPUT POWER (dBm) 20 26 23 18 24 14 12 15 10 13 8 11 GC 9 7 3 RF = 1600MHz VCC = VCCIF 3.1 3.4 3.2 3.3 3.5 VCC, VCCIF SUPPLY VOLTAGE (V) 6 4 2 3.6 5591 G34 SSB NF (dB) NF 17 16 GC (dB), IIP3 (dBm), P1dB (dBm) 25 -40C 25C 85C -40C 25C 85C GC 2 -4 -6 2 -2 0 LO INPUT POWER (dBm) 6 4 0 Single-Tone IF Output Power, 2 x 2 and 3 x 3 Spurs vs RF Input Power 20 10 IIP3 22 0 20 RF = 1600MHz VCCIF = 5V VCCIF = 3.3V 18 16 14 12 P1dB 10 8 6 4 5591 G33 Conversion Gain, IIP3 and RF Input P1dB vs Temperature IIP3 8 NF 5591 G32 Conversion Gain, IIP3 and NF vs Supply Voltage (Single Supply) 19 6 4 16 12 0 5591 G31 21 14 2 -6 18 IIP3 10 OUTPUT POWER (dBm) 12 10 18 16 20 SSB NF (dB) 18 16 IIP3 GC (dB), IIP3 (dBm) 20 24 GC (dB), IIP3 (dBm) 26 18 SSB NF (dB) 20 24 SSB NF (dB) 26 22 GC (dB), IIP3 (dBm) IFOUT 0 -80 5591 G28 GC (dB), IIP3 (dBm) 10 8 8 GC 16 1.25 SSB NF (dB) 12 -40C 25C 85C 105C GC (dB) IIP3 (dBm) IIP3 22 20 -40C 25C 85C 105C OUTPUT POWER TONE (dBm) 26 IFOUT (RF = 1600MHz) -10 (LO = 1790MHz) -20 -30 -40 2LO-2RF (RF = 1695MHz) -50 -60 -70 GC 6 -40 -25 -10 5 20 35 50 65 80 95 110 CASE TEMPERATURE (C) 5591 G35 -80 -12 -9 3LO-3RF (RF = 1726.67MHz) 6 9 -6 -3 0 3 RF INPUT POWER (dBm) 12 15 5591 G36 5591f 8 LTC5591 Typical DC Performance Characteristics ENA = ENB = High, test circuit shown in Figure 1. ISEL = Low VCC Supply Current vs Supply Voltage (Mixer and LO Amplifier) VCCIF Supply Current vs Supply Voltage (IF Amplifier) 192 260 85C 184 182 25C 180 -40C 3.1 220 25C 200 180 -40C 160 178 3 440 85C SUPPLY CURRENT (mA) 105C 186 176 460 105C 240 188 SUPPLY CURRENT (mA) SUPPLY CURRENT (mA) 190 Total Supply Current vs Temperature (VCC + VCCIF) 3.5 3.2 3.3 3.4 VCC SUPPLY VOLTAGE (V) 140 3.6 420 VCC = 3.3V, VCCIF = 5V (DUAL SUPPLY) 400 380 VCC = 3.3V, VCCIF = 3.3V (SINGLE SUPPLY) 360 3 3.3 3.6 3.9 4.2 4.5 4.8 5.1 VCCIF SUPPLY VOLTAGE (V) 5591 G37 340 -40 -25 -10 5 20 35 50 65 80 95 110 CASE TEMPERATURE (C) 5.4 5591 G38 5591 G39 ISEL = High VCC Supply Current vs Supply Voltage (Mixer and LO Amplifier) VCCIF Supply Current vs Supply Voltage (IF Amplifier) 280 124 105C 150 85C 120 25C 118 -40C 85C 130 25C 110 116 114 SUPPLY CURRENT (mA) SUPPLY CURRENT (mA) SUPPLY CURRENT (mA) 122 105C Total Supply Current vs Temperature (VCC + VCCIF) 260 VCC = 3.3V, VCCIF = 5V (DUAL SUPPLY) 240 VCC = VCCIF = 3.3V (SINGLE SUPPLY) 220 -40C 3 3.1 3.4 3.5 3.2 3.3 VCC SUPPLY VOLTAGE (V) 3.6 5591 G40 90 3 3.3 3.6 3.9 4.2 4.5 4.8 VCCIF SUPPLY VOLTAGE (V) 5.1 5.4 5591 G41 200 -40 -20 60 80 0 20 40 CASE TEMPERATURE (C) 100 5591 G42 5591f 9 LTC5591 Pin Functions RFA, RFB (Pins 1, 6): Single-Ended RF Inputs for Channels A and B. These pins are internally connected to the primary sides of the RF input transformers, which have low DC resistance to ground. Series DC-blocking capacitors should be used to avoid damage to the integrated transformer when DC voltage is present at the RF inputs. The RF inputs are impedance matched when the LO input is driven with a 06dBm source between 1.4GHz and 2.1GHz and the channels are enabled. CTA, CTB (Pins 2, 5): RF Transformer Secondary CenterTap on Channels A and B. These pins may require bypass capacitors to ground to optimize IIP3 performance. Each pin has an internally generated bias voltage of 1.2V and must be DC-isolated from ground and VCC. GND (Pins 3, 4, 7, 13, 15, 24, Exposed Pad Pin 25): Ground. These pins must be soldered to the RF ground plane on the circuit board. The exposed pad metal of the package provides both electrical contact to ground and good thermal contact to the printed circuit board. IFBB, IFBA (Pins 11, 20): Bias Adjust Pins for the IF Amplifiers. These pins allow independent adjustment of the internal IF buffer currents for channels B and A, respectively. The typical DC voltage on these pins is 2.2V. If not used, these pins must be DC isolated from ground and VCC. VCCB and VCCA (Pins 12, 19): Power Supply Pins for the LO Buffers and Bias Circuits. These pins must be connected to a regulated 3.3V supply with bypass capacitors located close to the pins. Typical current consumption is 91mA per pin. ENB, ENA (Pins 14, 17): Enable Pins. These pins allow Channels B and A, respectively, to be independently enabled. An applied voltage of greater than 2.5V activates the associated channel while a voltage of less than 0.3V disables the channel. Typical input current is less than 10A. These pins must not be allowed to float. IFGNDB, IFGNDA (Pins 8, 23): DC Ground Returns for the IF Amplifiers. These pins must be connected to ground to complete the DC current paths for the IF amplifiers. Chip inductors may be used to tune LO-IF and RF-IF leakage. Typical DC current is 100mA for each pin. LO (Pin 16): Single-Ended Local Oscillator Input. This pin is internally connected to the primary side of the LO input transformer and has a low DC resistance to ground. Series DC-blocking capacitors should be used to avoid damage to the integrated transformer when DC voltage is present at the LO input. The LO input is internally matched to 50 for all states of ENA and ENB. IFB+, IFB-, IFA-, IFA+ (Pins 9, 10, 21, 22): Open-Collector Differential Outputs for the IF Amplifiers of Channels B and A. These pins must be connected to a DC supply through impedance matching inductors, or transformer center-taps. Typical DC current consumption is 50mA into each pin. ISEL (Pin 18): Low Current Select Pin. When this pin is pulled low (<0.3V), both mixer channels are biased at the normal current level for best RF performance. When greater than 2.5V is applied, both channels operate at reduced current, which provides reasonable performance at lower power consumption. This pin must not be allowed to float. 5591f 10 LTC5591 Block Diagram 24 GND 23 22 IFGNDA IFA+ 21 IFA- 20 19 IFBA VCCA IF AMP 1 2 BIAS ISEL ENA RFA LO AMP CTA LO 18 17 16 3 GND 4 GND CTB 5 6 GND 15 LO AMP RFB ENB IF AMP 14 BIAS GND 13 7 GND IFB+ IFGNDB 8 9 IFB- 10 IFBB 11 VCCB 12 5591 BD 5591f 11 LTC5591 Test Circuit T1A 4:1 IFA 50 C7A L1A VCCIF 3.3V TO 5V C6 RFA 50 VCC 3.3V C5A 24 C1A 23 22 GND IFGNDA 21 IFA+ RF 0.015" L2A - IFA C3A 20 19 IFBA VCCA 1 RFA GND DC1710A EVALUATION BOARD BIAS STACK-UP GND (NELCO N4000-13) 0.062" 0.015" C4 ISEL 18 ISEL (0V/3.3V) ENA 17 ENA (0V/3.3V) LTC5591 2 CTA C8A C2 3 GND LO 50 LO 16 25 GND C8B RFB 50 4 GND GND 15 5 CTB ENB 14 ENB (0V/3.3V) C1B 6 RFB GND 13 GND IFGNDB 7 8 IFB+ IFB- IFBB VCCB 9 10 11 12 5591 TC01 C3B C5B L2B L1B C7B 4:1 T1B L1, L2 vs IF FREQUENCIES IF (MHz) L1, L2 (nH) 140 270 190 150 240 100 300 56 380 33 IFB 50 REF DES VALUE SIZE VENDOR C1A, C1B, C8A, C8B 2.7pF 0402 AVX C2 4.7pF 0402 AVX C3A, C3B C5A, C5B 22pF 0402 AVX C4, C6 1F 0603 AVX C7A, C7B 1000pF 0402 AVX L1, L2 150nH 0603 Coilcraft T1A, T1B TC1-1W-7ALN+ Mini-Circuits Figure 1. Standard Test Circuit Schematic (190MHz IF) 5591f 12 LTC5591 Applications Information Introduction The LTC5591 consists of two identical mixer channels driven by a common LO input signal. Each high linearity mixer consists of a passive double-balanced mixer core, IF buffer amplifier, LO buffer amplifier and bias/enable circuits. See the Pin Functions and Block Diagram sections for a description of each pin. Each of the mixers can be shutdown independently to reduce power consumption and low current mode can be selected that allows a trade-off between performance and power consumption. The RF and LO inputs are single-ended and are internally matched to 50. Low side or high side LO injection can be used. The IF outputs are differential. The evaluation circuit, shown in Figure 1, utilizes bandpass IF output matching and an IF transformer to realize a 50 single-ended IF output. The evaluation board layout is shown in Figure 2. if the source has DC voltage present, since the primary side of the RF transformer is internally DC-grounded. The DC resistance of the primary is approximately 3.6. The secondary winding of the RF transformer is internally connected to the channel A passive mixer core. The center-tap of the transformer secondary is connected to Pin 2 (CTA) to allow the connection of bypass capacitor, C8A. The value of C8A can be adjusted to improve the channel-to-channel isolation at specific RF operation frequency with minor impact to conversion gain, linearity and noise performance. The channel-to-channel isolation performance with different values of C8A is given in Figure 4. When used, it should be located within 2mm of Pin 2 for proper high frequency decoupling. The nominal DC voltage on the CTA pin is 1.2V. LTC5591 RFA TO CHANNEL A MIXER C1A 1 2 RFA CTA C8A 5591 F03 Figure 3. Channel A RF Input Schematic 5591 F02 Figure 2. Evaluation Board Layout RF Inputs The RF inputs of channels A and B are identical. The RF input of channel A, shown in Figure 3, is connected to the primary winding of an integrated transformer. A 50 match is realized when a series external capacitor, C1A, is connected to the RF input. C1A is also needed for DC blocking CHANNEL ISOLATION (dB) 55 50 45 40 35 30 1250 1450 C8 OPEN C8 = 2.2pF C8 = 2.7pF C8 = 3.3pF 1650 1850 2050 2250 RF FREQUENCY (MHz) 2450 5591 F04 Figure 4. Channel-to-Channel Isolation vs C8 Values 5591f 13 LTC5591 Applications Information For the RF inputs to be properly matched, the appropriate LO signal must be applied to the LO input. A broadband input match is realized with C1A = 2.2pF. The measured input return loss is shown in Figure 4 for LO frequencies of 1.4GHz, 1.75GHz and 2GHz. These LO frequencies correspond to lower, middle and upper values in the LO range. As shown in Figure 5, the RF input impedance is dependent on LO frequency, although a single value of C1A is adequate to cover the 1.3GHz to 2.3GHz RF band. LO Input The LO input, shown in Figure 6, is connected to the primary winding of an integrated transformer. A 50 impedance match is realized at the LO port by adding an external series capacitor, C2. This capacitor is also needed for DC blocking if the LO source has DC voltage present, since the primary side of the LO transformer is DC-grounded internally. The DC resistance of the primary is approximately 4.1. 0 RF PORT RETURN LOSS (dB) LTC5591 10 BIAS 20 ENA 30 18 17 TO MIXER A 40 LO TO MIXER B LO = 1.4GHz LO = 1.75GHz LO = 2GHz 50 60 ISEL 1 1.2 1.4 1.6 1.8 2 2.2 2.4 2.6 2.8 RF FREQUENCY (GHz) ENB 3 BIAS C2 LO 16 14 5591 F05 5591 F06 Figure 5. RF Port Return Loss Figure 6. LO Input Schematic The RF input impedance and input reflection coefficient, versus RF frequency, are listed in Table 1. The reference plane for this data is pin 1 of the IC, with no external matching, and the LO is driven at 1.75GHz. Table 1. RF Input Impedance and S11 (at Pin 1, No External Matching, fLO = 1.75GHz) S11 FREQUENCY (GHz) RF INPUT IMPEDANCE MAG ANGLE 1.0 25.3 + j34.6 0.51 100.8 1.2 33.7 + j38.7 0.46 88.1 1.4 43.8 + j38.6 0.39 76.8 1.6 56.0 + j33.5 0.31 62.3 1.8 48.1 + j9.1 0.09 96.4 2.0 38.5 + j21.4 0.27 104.6 2.2 40.1 + j28.3 0.32 91.8 2.4 44.0 + j34.7 0.35 79.6 2.6 52.1 + j40.7 0.37 65.3 2.8 64.1 + j44.1 0.38 51.2 3.0 78.8 + j42.0 0.38 37.5 The secondary of the transformer drives a pair of high speed limiting differential amplifiers for channels A and B. The LTC5591's LO amplifiers are optimized for the 1.4GHz to 2.1GHz LO frequency range; however, LO frequencies outside this frequency range may be used with degraded performance. The LO port is always 50 matched when VCC is applied, even when one or both of the channels is disabled. This helps to reduce frequency pulling of the LO source when 5591f 14 LTC5591 Applications Information LO1 PORT RETURN LOSS (dB) the mixer is switched between different operating states. Figure 7 illustrates the LO port return loss for the different operating modes. 0 2 4 6 BOTH CHANNELS OFF 8 10 12 14 16 18 20 22 24 26 ONE 28 BOTH CHANNELS ON CHANNEL ON 30 0.8 1 1.2 1.4 1.6 1.8 2 2.2 2.4 2.6 2.8 LO FREQUENCY (GHz) return pin (IFGNDA), and a pin for adjusting the internal bias (IFBA). The IF outputs must be biased at the supply voltage (VCCIFA), which is applied through matching inductors L1A and L2A. Alternatively, the IF outputs can be biased through the center tap of a transformer (T1A). The common node of L1A and L2A can be connected to the center tap of the transformer. Each IF output pin draws approximately 50mA of DC supply current (100mA total). An external load resistor, R2A, can be used to improve impedance matching if desired. IFGNDA (Pin 23) must be grounded or the amplifier will not draw DC current. Inductor L3A may improve LO-IF and RF-IF leakage performance in some applications, but is otherwise not necessary. Inductors should have small resistance for DC. High DC resistance in L3A will reduce the IF amplifier supply current, which will degrade RF performance. 5591 F07 Figure 7. LO Input Return Loss The nominal LO input level is 0dBm, though the limiting amplifiers will deliver excellent performance over a 6dBm input power range. Table 2 lists the LO input impedance and input reflection coefficient versus frequency. T1A C7A L1A L3A (OR SHORT) 100mA Table 2. LO Input Impedance vs Frequency (at Pin 16, No External Matching, ENA = ENB = High) S11 FREQUENCY (GHz) INPUT IMPEDANCE MAG ANGLE 1.0 39.4 + j46.4 0.47 75.5 1.2 55.3 + j40.8 0.36 61.4 1.4 61.9 + j26.8 0.25 52.6 1.6 56.5 + j16.1 0.16 59.5 1.8 47.6 + j14.0 0.14 91.6 2.0 41.6 + j18.0 0.21 103.9 2.2 38.4 + j23.5 0.29 101.5 2.4 37.1 + j30.7 0.36 93.3 2.6 38.4 + j38.3 0.42 83.3 2.8 42.0 + j47.6 0.47 72.2 3.0 48.6 + j56.1 0.49 61.8 IF Outputs The IF amplifiers in channels A and B are identical. The IF amplifier for channel A, shown in Figure 8, has differential open collector outputs (IFA+ and IFA-), a DC ground IFA 4:1 23 IGNDA L2A VCCIFA 22 IFA+ R1A (OPTION TO REDUCE DC POWER) C5A R2A LTC5591 21 20 IFBA IFA- VCCA IF AMP 4mA BIAS 5591 F08 Figure 8. IF Amplifier Schematic with Bandpass Match For optimum single-ended performance, the differential IF output must be combined through an external IF transformer or a discrete IF balun circuit. The evaluation board (see Figures 1 and 2) uses a 4:1 IF transformer for impedance transformation and differential to single-ended conversion. It is also possible to eliminate the IF transformer and drive differential filters or amplifiers directly. 5591f 15 LTC5591 Applications Information 22 21 IFA+ LTC5591 0.9nH IF A- 0.9nH RIF CIF Values of L1A and L2A are tabulated in Figure 1 for various IF frequencies. The measured IF output return loss for bandpass IF matching is plotted in Figure 10. 0 L1, L2 = 270nH 5 IF PORT RETURN LOSS (dB) At IF frequencies, the IF output impedance can be modeled as 300 in parallel with 2.3pF. The equivalent small-signal model, including bondwire inductance, is shown in Figure 9. Frequency-dependent differential IF output impedance is listed in Table 3. This data is referenced to the package pins (with no external components) and includes the effects of IC and package parasitics. 10 15 20 L1, L2 = 150nH L1, L2 = 100nH 25 L1, L2 = 56nH 30 50 100 150 200 250 300 350 400 450 IF FREQUENCY (MHz) 5591 F09 Figure 9. IF Output Small-Signal Model Lowpass IF Matching Bandpass IF Matching The bandpass IF matching configuration, shown in Figures 1 and 8, is best suited for IF frequencies in the 90MHz to 500MHz range. Resistor R2A may be used to reduce the IF output resistance for greater bandwidth and inductors L1A and L2A resonate with the internal IF output capacitance at the desired IF frequency. The value of L1A, L2A can be estimated as follows: L1A = L2A = 1 (2fIF ) 5591 F10 Figure 10. IF Output Return Loss with Bandpass Matching 2*2*C IF where CIF is the internal IF capacitance (listed in Table 3). Table 3. IF Output Impedance vs Frequency FREQUENCY (MHz) DIFFERENTIAL OUTPUT IMPEDANCE (RIF || XIF (CIF)) 90 321 || -j769 (2.3pF) 140 307 || -j494 (2.3pF) 190 300 || -j364 (2.3pF) 240 292 || -j286 (2.3pF) 300 285 || -j225 (2.4pF) 380 276 || -j177 (2.4pF) 500 264 || -j122 (2.6pF) For IF frequencies below 90MHz, the inductance values become unreasonably high and the lowpass topology shown in Figure 11 is preferred. This topology also can provide improved RF to IF and LO to IF isolation. VCCIFA is supplied through the center tap of the 4:1 transformer. A lowpass impedance transformation is realized by shunt elements R2A and C9A (in parallel with the internal RIF and CIF), and series inductors L1A and L2A. Resistor R2A is used to reduce the IF output resistance for greater bandwidth, or it can be deleted for the highest conversion gain. The final impedance transformation to 50 is realized by transformer T1A. The measured IF output return loss for T1A VCCIFA 3.1 TO 5.3V IFA 50 4:1 C6 C5A L1A L2A R2A C9A 22 IFA+ 21 LTC5591 IFA- 5591 F11 Figure 11. IF Output with Lowpass Matching 5591f 16 LTC5591 Applications Information lowpass IF matching with R2A and C9A open is plotted in Figure 12. The LTC5591 demo board (see Figure 2) has been laid out to accommodate this matching topology with only minor modifications. L1, L2 = 180nH IF PORT RETURN LOSS (dB) VCCIF (V) 3.3 0 5 Table 4. Performance Comparison with VCCIF = 3.3V and 5V (RF = 1950MHz, Low Side LO, IF = 190MHz, ENA = ENB = High) 5 L1, L2 = 56nH 10 15 20 25 L1, L2 = 100nH 30 35 50 90 130 170 210 IF FREQUENCY (MHz) 250 5591 F12 Figure 12. IF Output Return Loss with Lowpass Matching IF Amplifier Bias The IF amplifier delivers excellent performance with VCCIF = 3.3V, which allows a single supply to be used for VCC and VCCIF . At VCCIF = 3.3V, the RF input P1dB of the mixer is limited by the output voltage swing. For higher P1dB, in this case, resistor R2A (Figure 7) can be used to reduce the output impedance and thus the voltage swing, thus improving P1dB. The trade-off for improved P1dB will be lower conversion gain. With VCCIF increased to 5V the P1dB increases by over 3dB, at the expense of higher power consumption. Mixer P1dB performance at 1950MHz is tabulated in Table 4 for VCCIF values of 3.3V and 5V. For the highest conversion gain, high-Q wire-wound chip inductors are recommended for L1A and L2A, especially when using VCCIF = 3.3V. Low cost multilayer chip inductors may be substituted, with a slight reduction in conversion gain. R2A () ICCIF (mA) GC (dB) P1dB (dBm) IIP3 (dBm) NF (dB) Open 200 8.5 10.7 26.2 9.9 1k 200 7.4 11.5 26.5 9.9 Open 207 8.4 13.9 26.7 10.1 The IFBA pin (Pin 20) is available for reducing the DC current consumption of the IF amplifier, at the expense of IIP3. The nominal DC voltage at Pin 20 is 2.1V, and this pin should be left open-circuited for optimum performance. The internal bias circuit produces a 4mA reference for the IF amplifier, which causes the amplifier to draw approximately 100mA. If resistor R1A is connected to Pin 20 as shown in Figure 8, a portion of the reference current can be shunted to ground, resulting in reduced IF amplifier current. For example, R1A = 470 will shunt away 1.4mA from Pin 20 and the IF amplifier current will be reduced by 35% to approximately 65mA. Table 5 summarizes RF performance versus total IF amplifier current when both channels are enabled. Table 5. Mixer Performance with Reduced IF Amplifier Current RF = 1950MHz, Low Side LO, IF = 190MHz, VCC = VCCIF = 3.3V R1A, R1B ICCIF (mA) GC (dB) IIP3 (dBm) P1dB (dBm) NF (dB) Open 200 8.5 26.2 10.7 9.9 3.3k 176 8.4 25.7 10.8 9.9 1.0k 151 8.1 24.7 10.9 9.9 470 130 7.9 23.7 10.9 9.9 RF = 1600MHz, High Side LO, IF = 190MHz, VCC = VCCIF = 3.3V R1A, R1B ICCIF (mA) GC (dB) IIP3 (dBm) P1dB (dBm) NF (dB) Open 200 8.6 24.6 10.2 10.2 3.3k 176 8.4 24.3 10.4 10.3 1.0k 151 8.1 23.5 10.6 10.3 470 130 7.9 22.7 10.5 10.3 5591f 17 LTC5591 Applications Information Low Current Mode Both mixer channels can be set to low current mode using the ISEL pin. This allows flexibility to choose a reduced current mode of operation when lower RF performance is acceptable. Figure 13 shows a simplified schematic of the ISEL pin interface. When ISEL is set low (<0.3V), both channels operate at nominal DC current. When ISEL is set high (>2.5V), the DC currents in both channels are reduced, thus reducing power consumption. The performance in low power mode and normal power mode are compared in Table 6. 19 ISEL 500 18 19 CLAMP ENA 17 500 5591 F14 Figure 14. ENA Interface Schematic The Enable pins must be pulled high or low. If left floating, the on/off state of the IC will be indeterminate. If a three-state condition can exist at the enable pins, then a pull-up or pull-down resistor must be used. LTC5591 VCCA LTC5591 VCCA Supply Voltage Ramping BIAS A Fast ramping of the supply voltage can cause a current glitch in the internal ESD protection circuits. Depending on the supply inductance, this could result in a supply voltage transient that exceeds the maximum rating. A supply voltage ramp time of greater than 1ms is recommended. VCCB BIAS B 5591 F13 Figure 13. ISEL Interface Schematic Spurious Output Levels ISEL ITOTAL (mA) GC (dB) IIP3 (dBm) P1dB (dBm) NF (dB) Low 382 8.5 26.2 10.7 9.9 Mixer spurious output levels versus harmonics of the RF and LO are tabulated in Table 7. The spur levels were measured on a standard evalution board using the test circuit shown in Figure 1. The spur frequencies can be calculated using the following equation: High 239 7.2 21.4 10.7 10.3 fSPUR = (M * fRF)-(N * fLO) Table 6. Performance Comparison Between Different Power Modes RF = 1950MHz, Low Side LO, IF = 190MHz, ENA = ENB = High Enable Interface Figure 14 shows a simplified schematic of the ENA pin interface (ENB is identical). To enable channel A, the ENA voltage must be greater than 2.5V. If the enable function is not required, the enable pin can be connected directly to VCC. The voltage at the enable pin should never exceed the power supply voltage (VCC) by more than 0.3V. If this should occur, the supply current could be sourced through the ESD diode, potentially damaging the IC. Table 7. IF Output Spur Levels (dBc) RF = 1950MHz, PRF = -3dBm, PLO = 0dBm, PIF 190MHz, Low Side LO, VCC = 3.3V, VCCIF = 3.3V, ENA = ENB = High, ISEL = Low, TC = 25C N 0 1 2 3 4 5 6 7 8 9 0 -41 -54 -64 -84 -66 -74 -75 -81 -84 1 -49 0 -56 -42 -68 -77 -75 -70 * -92 2 -82 -83 -70 -77 * * * * * * M * * * * * 3 * -88 * -71 * 4 * * * * * * * * * * 5 * * * * * * * * * * 6 * * * * * * * * * 7 * * * * * * -84 * *Less than -100dBc 5591f 18 LTC5591 Package Description UH Package UH Package 24-Lead Plastic QFN (5mm x 5mm) 24-Lead LTC Plastic (5mm x 5mm) (Reference DWGQFN # 05-08-1747 Rev A) (Reference LTC DWG # 05-08-1747 Rev A) 0.75 0.05 5.40 0.05 3.90 0.05 3.20 0.05 3.25 REF 3.20 0.05 PACKAGE OUTLINE 0.30 0.05 0.65 BSC RECOMMENDED SOLDER PAD LAYOUT APPLY SOLDER MASK TO AREAS THAT ARE NOT SOLDERED 5.00 0.10 R = 0.05 TYP 0.75 0.05 0.00 - 0.05 BOTTOM VIEW--EXPOSED PAD R = 0.150 TYP 23 PIN 1 NOTCH R = 0.30 TYP OR 0.35 x 45 CHAMFER 24 0.55 0.10 PIN 1 TOP MARK (NOTE 6) 1 2 5.00 0.10 3.25 REF 3.20 0.10 3.20 0.10 (UH24) QFN 0708 REV A 0.200 REF NOTE: 1. DRAWING IS NOT A JEDEC PACKAGE OUTLINE 2. DRAWING NOT TO SCALE 3. ALL DIMENSIONS ARE IN MILLIMETERS 4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.20mm ON ANY SIDE 5. EXPOSED PAD SHALL BE SOLDER PLATED 6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION ON THE TOP AND BOTTOM OF PACKAGE 0.30 0.05 0.65 BSC 5591f Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights. 19 LTC5591 Typical Application Lowpass IF Matching, Low Side LO, VCC = 3.3V, VCCIF = 3.3V, ENA = ENB = High, ISEL = Low, TC = 25C, PLO = 0dBm, PRF = -3dBm (-3dBm/Tone for Two-Tone IIP3 Tests, f = 2MHz), IF = 190MHz T1A 4:1 VCCIF 3.3V TO 5V Conversion Gain, IIP3 and SSB NF vs RF Frequency IFA 50 28 56nH 56nH VCC 3.3V RFA 50 2.7pF 23 22 21 GND IFGNDA IFA+ IFA- 19 IFBA VCCA 1 RFA 2.7pF 22pF 20 ISEL ISEL 18 2 CTA 3 GND 4.7pF LO 16 TO CHANNEL B 14 22 13 20 12 18 11 NF 16 10 14 9 12 8 10 7 GC 8 ENA ENA 17 LTC5591 CHANNEL A 1F 15 IIP3 24 LO 50 6 1.6 SSB NF (dB) TO CHANNEL B 24 16 26 GC (dB), IIP3 (dBm) 22pF 1F 6 1.7 1.8 1.9 2.0 2.1 2.2 RF FREQUENCY (GHz) 2.3 5 2.4 5591 TA02b 4 GND GND 15 CHANNEL B NOT SHOWN 5591 TA02a Related Parts PART NUMBER DESCRIPTION COMMENTS Infrastructure LT5527 400MHz to 3.7GHz, 5V Downconverting Mixer 2.3dB Gain, 23.5dBm IIP3 and 12.5dB NF at 1900MHz, 5V/78mA Supply LT5557 400MHz to 3.8GHz, 3.3V Downconverting Mixer 2.9dB Gain, 24.7dBm IIP3 and 11.7dB NF at 1950MHz, 3.3V/82mA Supply LTC6416 2GHz 16-Bit ADC Buffer 40.25dBm OIP3 to 300MHz, Programmable Fast Recovery Output Clamping LTC6412 31dB Linear Analog VGA 35dBm OIP3 at 240MHz, Continuous Gain Range -14dB to 17dB LTC5540/LTC5541/ 600MHz to 4GHz Downconverting Mixer Family 8dB Gain, >25dBm IIP3, 10dB NF, 3.3V/200mA Supply LTC5542/LTC5543 LT5554 Ultralow Distort IF Digital VGA 48dBm OIP3 at 200MHz, 2dB to 18dB Gain Range, 0.125dB Gain Steps LT5578 400MHz to 2.7GHz Upconverting Mixer 27dBm OIP3 at 900MHz, 24.2dBm at 1.95GHz, Integrated RF Transformer LT5579 1.5GHz to 3.8GHz Upconverting Mixer 27.3dBm OIP3 at 2.14GHz, NF = 9.9dB, 3.3V Supply, Single-Ended LO and RF Ports RF Power Detectors LT5534 50MHz to 3GHz Log RF Power Detector with 1dB Output Variation over Temperature, 38ns Response Time, Log Linear 60dB Dynamic Range Response LT5581 6GHz Low Power RMS Detector 40dB Dynamic Range, 1dB Accuracy Over Temperature, 1.5mA Supply Current LTC5583 Dual 6GHz RMS Power Detector Measures 40MHz to 6GHz, Up to 60dB Dynamic Range, >40dB Channel-to-Channel VSWR Isolation, Difference Output for VSWR Measurement ADCs LTC2285 14-Bit, 125Msps Dual ADC 72.4dB SNR, >88dB SFDR, 790mW Power Consumption LTC2185 16-Bit, 125Msps Dual ADC Ultralow Power 76.8dB SNR, 185mW/Channel Power Consumption LTC2242-12 12-Bit, 250Msps ADC 65.4dB SNR, 78dB SFDR, 740mW Power Consumption 5591f 20 Linear Technology Corporation LT 0311 * PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 FAX: (408) 434-0507 www.linear.com LINEAR TECHNOLOGY CORPORATION 2011