Wideband, 37 dB Isolation at 1 GHz, CMOS 1.65 V to 2.75 V, 2:1 Mux/SPDT Switches ADG918/ADG919 FEATURES Wideband Switch: -3 dB @ 4 GHz Absorptive/Reflective Switches High Off Isolation (37 dB @ 1 GHz) Low Insertion Loss (0.8 dB @1 GHz) Single 1.65 V to 2.75 V Power Supply CMOS/LVTTL Control Logic 8-Lead MSOP and Tiny 3 mm 3 mm LFCSP Packages Low Power Consumption (<1 A) FUNCTIONAL BLOCK DIAGRAMS ADG918 RF1 RFC RF2 CTRL 50 APPLICATIONS Wireless Communications General-Purpose RF Switching Dual-Band Applications High Speed Filter Selection Digital Transceiver Front End Switch IF Switching Tuner Modules Antenna Diversity Switching ADG919 RF1 RFC RF2 CTRL GENERAL DESCRIPTION The ADG918/ADG919 are wideband switches using a CMOS process to provide high isolation and low insertion loss to 1 GHz. The ADG918 is an absorptive (matched) switch having 50 terminated shunt legs, while the ADG919 is a reflective switch. These devices are designed such that the isolation is high over the dc to 1 GHz frequency range. They have on-board CMOS control logic, thus eliminating the need for external controlling circuitry. The control inputs are both CMOS and LVTTL compatible. The low power consumption of these CMOS devices makes them ideally suited to wireless applications and generalpurpose high frequency switching. PRODUCT HIGHLIGHTS 1. -37 dB Off Isolation @ 1 GHz 2. 0.8 dB Insertion Loss @ 1 GHz 3. Tiny 8-Lead MSOP/LFCSP Packages 0 -10 -0.4 VDD = 2.5V TA = 25C -0.6 -0.8 -20 -1.0 INSERTION LOSS (dB) -30 ISOLATION (dB) 50 -40 -50 S12 -60 -70 -80 -1.2 -1.4 -1.6 -1.8 -2.0 -2.2 -2.4 -2.6 S21 -90 -100 10k -2.8 -3.0 100k 1M 10M 100M FREQUENCY (Hz) 1G 10G -3.2 10k VDD = 2.5V TA = 25C 100k 1M 10M 100M FREQUENCY (Hz) 1G 10G Figure 1. Off Isolation vs. Frequency Figure 2. Insertion Loss vs. Frequency Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective companies. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781/329-4700 www.analog.com Fax: 781/326-8703 (c) 2003 Analog Devices, Inc. All rights reserved. REV. 0 = 1.65 V to 2.75 V, GND = 0 V, input power = 0 dBm, T to T , unless otherwise noted.) ADG918/ADG919-SPECIFICATIONS1 (Vall specifications DD MIN Parameter Symbol AC ELECTRICAL CHARACTERISTICS Operating Frequency3 -3 dB Frequency4 Input Power4 Conditions MAX Min B Version Typ2 Max DC Insertion Loss S21, S12 Isolation--RFC to RF1/RF2 S21, S12 Isolation--RF1 to RF2 (Crosstalk) S21, S12 Return Loss (On Channel)4 S11, S22 Return Loss (Off Channel)4 ADG918 S11, S22 On Switching Time4 Off Switching Time4 Rise Time4 Fall Time4 1 dB Compression4 Third Order Intermodulation Intercept Video Feedthrough5 tON tOFF tRISE tFALL P-1 dB IP3 0 V dc Bias 0.5 V dc Bias DC to 100 MHz; VDD = 2.5 V 10% 500 MHz; VDD = 2.5 V 10% 1000 MHz; VDD = 2.5 V 10% 100 MHz 55 500 MHz 43 1000 MHz 34 100 MHz 54 500 MHz 39 1000 MHz 31 DC to 100 MHz 21 500 MHz 22 1000 MHz 22 DC to 100 MHz 18 500 MHz 17 1000 MHz 16 50% CTRL to 90% RF 50% CTRL to 10% RF 10% to 90% RF 90% to 10% RF 1000 MHz 900 MHz/901 MHz, 4 dBm 30 DC ELECTRICAL CHARACTERISTICS Input High Voltage VINH VINH Input Low Voltage VINL VINL Input Leakage Current II VDD = 2.25 V to 2.75 V VDD = 1.65 V to 1.95 V VDD = 2.25 V to 2.75 V VDD = 1.65 V to 1.95 V 0 VIN 2.75 V CAPACITANCE4 RF1/RF2, RF Port On Capacitance CTRL Input Capacitance CRF ON CCTRL f = 1 MHz f = 1 MHz POWER REQUIREMENTS VDD Quiescent Power Supply Current IDD Digital inputs = 0 V or VDD 0.4 0.5 0.8 60 47 37 57 42 33 27 27 26 23 21 20 6.6 6.5 6.1 6.1 17 36 2.5 2 4 7 16 0.7 0.8 1.25 10 9.5 9 9 1.7 0.65 VCC 0.1 0.7 0.35 VCC 1 1.6 2 1.65 0.1 Unit GHz GHz dBm dBm dB dB dB dB dB dB dB dB dB dB dB dB dB dB dB ns ns ns ns dBm dBm mV p-p V V V V A pF pF 2.75 1 V A NOTES 1 Temperature range B Version: -40C to +85C. 2 Typical values are at V DD = 2.5 V and 25C, unless otherwise stated. 3 Point at which insertion loss degrades by 1 dB. 4 Guaranteed by design, not subject to production test. 5 The dc transience at the output of any port of the switch when the control voltage is switched from high to low or low to high in a 50 test setup, measured with 1 ns rise time pulses and 500 MHz bandwidth. Specifications subject to change without notice. -2- REV. 0 ADG918/ADG919 ABSOLUTE MAXIMUM RATINGS 1 LFCSP Package JA Thermal Impedance (2-layer board) . . . . . . . . . . 84C/W JA Thermal Impedance (4-layer board) . . . . . . . . . . 48C/W Lead Temperature, Soldering (10 sec) . . . . . . . . . . . . . 300C IR Reflow, Peak Temperature (<20 sec) . . . . . . . . . . . . 235C ESD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 kV (TA = 25C, unless otherwise noted.) VDD to GND . . . . . . . . . . . . . . . . . . . . . . . . . . -0.5 V to +4 V Inputs to GND . . . . . . . . . . . . . . . . . . -0.5 V to VDD + 0.3 V2 Continuous Current . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 mA Input Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 dBm Operating Temperature Range Industrial (B Version) . . . . . . . . . . . . . . . . -40C to +85C Storage Temperature Range . . . . . . . . . . . . -65C to +150C Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . 150C MSOP Package JA Thermal Impedance . . . . . . . . . . . . . . . . . . . . . 206C/W NOTES 1 Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions above those listed in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Only one absolute maximum rating may be applied at any one time. 2 RF1/RF2 Off Port Inputs to Ground .............................. -0.5 V to VDD - 0.5 V ORDERING GUIDE Model Temperature Range Package Description Package Option Branding ADG918BRM ADG918BRM-REEL7 ADG918BCP ADG918BCP-REEL7 ADG919BRM ADG919BRM-REEL7 ADG919BCP ADG919BCP-REEL7 -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C Mini Small Outline Package (MSOP) Mini Small Outline Package (MSOP) Lead Frame Chip Scale Package (LFCSP) Lead Frame Chip Scale Package (LFCSP) Mini Small Outline Package (MSOP) Mini Small Outline Package (MSOP) Lead Frame Chip Scale Package (LFCSP) Lead Frame Chip Scale Package (LFCSP) RM-8 RM-8 CP-8* CP-8* RM-8 RM-8 CP-8* CP-8* W4B W4B W4B W4B W5B W5B W5B W5B *Contact factory for availability. CAUTION ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection. Although the ADG918/ADG919 features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of functionality. PIN CONFIGURATION 8-Lead MSOP (RM-8) 8-Lead 3 mm 3 mm LFCSP (CP-8) ADG918/ ADG919 Mnemonic Function 1 VDD 2 CTRL 3, 6, 7 GND 4 5 8 RFC RF2 RF1 Power Supply Input. These parts can be operated from 1.65 V to 2.75 V, and VDD should be decoupled to GND. CMOS or TTL Logic Level; 0 RF2 to RFC 1 RF1 to RFC Ground Reference Point for All Circuitry on the Part COMMON RF Port for Switch RF2 Port RF1 Port 7 GND 6 GND TOP VIEW RFC 4 (Not to Scale) 5 RF2 GND 3 Table I. Truth Table REV. 0 Pin No. 8 RF1 VDD 1 CTRL 2 PIN FUNCTION DESCRIPTIONS CTRL Signal Path 0 1 RF2 to RFC RF1 to RFC -3- ADG918/ADG919 TERMINOLOGY Parameter Description VDD IDD GND CTRL VINL VINH IINL (IINH) CIN tON tOFF tRISE tFALL Off Isolation Most positive power supply potential Positive supply current Ground (0 V) reference Logic control input Maximum input voltage for Logic 0 Minimum input voltage for Logic 1 Input current of the digital input Digital input capacitance Delay between applying the digital control input and the output switching on. Delay between applying the digital control input and the output switching off. Rise time. Time for the RF signal to rise from 10% to 90% of the ON level. Fall time. Time for the RF signal to fall from 90% to 10% of the ON level. The attenuation between input and output ports of the switch when the switch control voltage is in the OFF condition. Insertion Loss The attenuation between input and output ports of the switch when the switch control voltage is in the ON condition. 1 dB compression point. The RF input power level at which the switch insertion loss increases by 1 dB over its P-1 dB low level value. It is a measure of how much power the ON switch can handle before the insertion loss increases by 1 dB. Third order intermodulation intercept. This is a measure of the power in false tones that occur when closely spaced IP3 tones are passed through a switch, whereby the nonlinearity of the switch causes these false tones to be generated. Return Loss The amount of reflected power relative to the incident power at a port. Large return loss indicates good matching. By measuring Return Loss the VSWR can be calculated from conversion charts. VSWR (voltage standing wave ratio) indicates degree of matching present at a switch RF port. Video Feedthrough Spurious signals present at the RF ports of the switch when the control voltage is switched from high to low or low to high without an RF signal present. -4- REV. 0 Typical Performance Characteristics-ADG918/ADG919 -0.40 VDD = 2.5V -0.45 VDD = 2.75V -0.50 VDD = 2.25V -0.55 -0.60 -0.65 -0.70 -0.75 TA = 25C 100k 1M 10M 100M FREQUENCY (Hz) 1G 10G 100k 1M 10M 100M FREQUENCY (Hz) 1G 10G TPC 2. Insertion Loss vs. Frequency over Supplies (RF1/RF2, S12, and S21) (Zoomed TPC 1 Plot) 0 V = 1.65V TO 2.75V -10 T DD= 25C A -20 0 -40C -10 VDD = 1.65V TO 2.75V TA = 25C -20 -30 -30 -40 S12 -50 -60 1G 10G 100k 1M 10M 100M FREQUENCY (Hz) 1G 10G TPC 5. Isolation vs. Frequency over Supplies (RF1/RF2, ADG918) S12 (+85C) S12 (+25C) -70 S12 (-40C) S21 (-40C, +25C, +85C) 100k 1M 10M 100M FREQUENCY (Hz) 1G 10G TPC 7. Isolation vs. Frequency over Temperature (RF1/RF2, ADG919) REV. 0 -15 OFF SWITCH (ADG918) X-TALK (dB) RETURN LOSS (dB) -10 -40 -20 -25 -30 ON SWITCH -35 -40 10k 100k 1M 10M 100M FREQUENCY (Hz) 1G 10G TPC 8. Return Loss vs. Frequency (RF1/RF2, S11) -5- S21 100k 1M 10M 100M FREQUENCY (Hz) 1G 10G TPC 6. Isolation vs. Frequency over Supplies (RF1/RF2, ADG919) TA = 25C -5 VDD = 2.5V -30 -90 -70 -100 10k 0 -100 10k S12 -60 -90 S21 -90 10k VDD = 2.5V -80 -50 -80 -80 -10 -60 -40 -70 TPC 4. Insertion Loss vs. Frequency over Temperature (RF1/RF2, S12, and S21) -50 10G TPC 3. Insertion Loss vs. Frequency over Supplies (RF1/RF2, S12, and S21) ISOLATION (dB) 10k TA = 25C -0.80 10k ISOLATION (dB) INSERTION LOSS (dB) VDD = 2.75V INSERTION LOSS (dB) VDD = 2.25V -0.2 -0.4 -0.6 -0.8 +25C +85C -1.0 -1.2 -1.4 -1.6 -1.8 -2.0 -2.2 -2.4 -2.6 -2.8 VDD = 2.5V -3.0 -3.2 10k 100k 1M 10M 100M FREQUENCY (Hz) ISOLATION (dB) VDD = 2.5V -0.35 TPC 1. Insertion Loss vs. Frequency over Supplies (RF1/RF2, S12, and S21) -20 -0.2 -0.4 -0.6 -0.8 VDD = 1.8V VDD = 1.65V -1.0 -1.2 -1.4 -1.6 -1.8 -2.0 -2.2 -2.4 VDD = 1.95V -2.6 -2.8 TA = 25C -3.0 -3.2 10k 100k 1M 10M 100M 1G FREQUENCY (Hz) -0.30 INSERTION (dB) INSERTION LOSS (dB) -0.2 -0.4 -0.6 -0.8 -1.0 -1.2 -1.4 -1.6 -1.8 -2.0 -2.2 -2.4 -2.6 -2.8 -3.0 -3.2 -10 -15 TA = 25C -20 VDD = 2.5V -25 -30 -35 -40 -45 -50 -55 -60 -65 -70 -75 -80 10k 100k 1M 10M 100M FREQUENCY (Hz) 1G TPC 9. Crosstalk vs. Frequency (RF1/RF2, S12, S21) 10G ADG918/ADG919 40 35 CH1 IP3 (dBm) 30 CTRL CH2/3 RFC 25 20 15 10 CH1 = CTRL = 1V/DIV CH2 = RF1 = 100mV/DIV CH3 = RF2 = 100mV/DIV TRISE = 6.1ns TFALL = 6.1ns CH2 p-p 2.002mV CH1 500mV CH2 1mV m 10.0ns TPC 11. Video Feedthrough TPC 10. Switch Timing 5 0 250 VDD = 2.5V TA = 25C 350 450 550 650 750 FREQUENCY (MHz) 850 TPC 12. IP3 vs. Frequency 20 18 16 P-1dB (dBm) 14 12 10 8 6 4 VDD = 2.5V TA = 25C 2 0 0 250 500 750 1000 1250 1500 FREQUENCY (MHz) TPC 13. P-1dB vs. Frequency -6- REV. 0 ADG918/ADG919 Test Circuits* VDD 0.1F VDD 0.1F VDD RF1 VDD VCTRL RL 50 CTRL 50% 50% RF2 CTRL 90% VOUT VOUT NETWORK ANALYZER 50 RFC VOUT RFx RFC VS RL 50 ADG919 50 VS 10% VCTRL GND t ON GND INSERTION LOSS = 20log t OFF Test Circuit 1. Switching Timing: tON, tOFF VOUT VS Test Circuit 4. Insertion Loss VDD 0.1F VDD 0.1F VDD VDD RF1 RFx RFC VOUT 50% RL 50 CTRL 50 50% 50 VOUT 90% 10% 90% VCTRL t RISE RF2 CTRL 10% GND RL 50 t FALL CROSSTALK = 20log VOUT VS Test Circuit 5. Crosstalk VDD VDD 0.1F 0.1F VDD 50 ADG919 RF1 RL 50 RFC VS VDD RF2 CTRL RF1 RF2 CTRL VCTRL GND OFF ISOLATION = 20log GND VOUT VS Test Circuit 3. Off Isolation Test Circuit 6. Video Feedthrough *Similar setups for ADG918. -7- NC RFC NETWORK ANALYZER 50 ADG919 VOUT OSCILLOSCOPE REV. 0 VOUT GND Test Circuit 2. Switch Timing: tRISE, tFALL VCTRL VS RFC VCTRL VS NETWORK ANALYZER ADG919 NC ADG918/ADG919 VDD VDD 0.1F 0.1F VDD VDD ADG919 RF1 SPECTRUM ANALYZER 50 RFC RF2 CTRL VCTRL ADG919 RF1 RF SOURCE SPECTRUM ANALYZER COMBINER RF2 CTRL RF SOURCE VCTRL GND Test Circuit 7. IP3 50 RFC RF SOURCE VS GND Test Circuit 8. P-1dB -8- REV. 0 ADG918/ADG919 APPLICATIONS Filter Selection The ADG918/ADG919 are ideal solutions for low power, high frequency applications. The low insertion loss, high isolation between ports, low distortion, and low current consumption of these parts make them excellent solutions for many high frequency switching applications. The most obvious application is in a transmit/receive block, as shown in the wireless metering block diagram in Figure 3. The ADG919 can be used as a 2:1 demultiplex to switch high frequency signals between different filters and also to multiplex the signal to the output. RFIN Other applications include switching between high frequency filters, ASK generator, FSK generator, and antenna diversity switch in many tuner modules. RFC ADG919 RF1 RF1 RF2 RF2 ADG919 RFC RFOUT Figure 5. Filter Selection ADG9xx EVALUATION BOARD The ADG9xx evaluation board allows designers to evaluate the high performance wideband switches with a minimum of effort. Absorptive vs. Reflective The ADG918 is an absorptive (matched) switch with 50 terminated shunt legs, and the ADG919 is a reflective switch with 0 terminated shunts to ground. The ADG918 absorptive switch has a good VSWR on each port, regardless of the switch mode. An absorptive switch should be used when there is a need for a good VSWR that is looking into the port but not passing the through signal to the common port. The ADG918 is therefore ideal for applications that require minimum reflections back to the RF source. It also ensures that the maximum power is transferred to the load. To prove that these devices meet the user's requirements, the user only requires a power supply and a network analyzer along with the evaluation board. An application note is available with the evaluation board and gives complete information on operating the evaluation board. The RFC port (see Figure 6) is connected through a 50 transmission line to the top left SMA connector J1. RF1 and RF2 are connected through 50 transmission lines to the top two SMA connectors J2 and J3, respectively. A through transmission line connects J4 and J5 and this transmission line is used to estimate the loss of the PCB over the environmental conditions being evaluated. The ADG919 reflective switch is suitable for applications where high off port VSWR does not matter and the switch has some other desired performance feature. It can be used in many applications, including high speed filter selection. In most cases, an absorptive switch can be used instead of a reflective switch, but not vice versa. The board is constructed of a 4-layer, FR4 material with a dielectric constant of 4.3 and an overall thickness of 0.062 inches. Two ground layers with grounded planes provide ground for the RF transmission lines. The transmission lines were designed using a coplanar waveguide with ground plane model using a trace width of 0.052 inches, clearance to ground plane of 0.030 inches, dielectric thickness of 0.029 inches, and a metal thickness of 0.0014 inches. Wireless Metering The ADG918 can be used in wireless metering applications. It can be used in conjunction with the ADF7020 transceiver IC for a utility metering transceiver application, providing the required isolation between the transmit and receive signals. The SPDT configuration isolates the high frequency receive signal from the high frequency transmit. LNA ANTENNA ADG918 TX/RX SWITCH PA Figure 3. Wireless Metering Tuner Modules The ADG918 can be used in a tuner module to switch between the cable TV input and the off-air antenna. This part is also ideal for use as an antenna diversity switch, switching different antenna to the tuner. Figure 6. ADG9xx Evaluation Board Top View VGA ANTENNA ADG918/ ADG919 TUNER CABLE Figure 4. Tuner Modules REV. 0 -9- ADG918/ADG919 OUTLINE DIMENSIONS 8-Lead Mini Small Outline Package [MSOP] (RM-8) Dimensions shown in millimeters 3.00 BSC 8 5 4.90 BSC 3.00 BSC 1 4 PIN 1 0.65 BSC 1.10 MAX 0.15 0.00 0.38 0.22 COPLANARITY 0.10 0.80 0.60 0.40 8 0 0.23 0.08 SEATING PLANE COMPLIANT TO JEDEC STANDARDS MO-187AA 8-Lead Lead Frame Chip Scale Package [LFCSP] 3 mm 3 mm Body (CP-8) Dimensions shown in millimeters 3.00 BSC SQ 0.50 0.40 0.30 0.60 MAX PIN 1 INDICATOR 0.45 PIN 1 INDICATOR 0.90 0.85 0.80 TOP VIEW 0.50 BSC 0.25 MIN 0.80 MAX 0.65 TYP 12 MAX SEATING PLANE 1 8 2.75 BSC SQ 1.50 REF BOTTOM VIEW 5 1.90 1.75 1.60 4 1.60 1.45 1.30 0.05 MAX 0.02 NOM 0.30 0.23 0.18 0.20 REF -10- REV. 0 -11- -12- C03335-0-8/03(0)