LT5500 1.8GHz to 2.7GHz Receiver Front End U DESCRIPTIO FEATURES The LT(R)5500 is a receiver front end IC designed for low voltage operation. The chip contains a low noise amplifier (LNA), a Mixer and an LO buffer. The IC is designed to operate over a power supply voltage range from 1.8V to 5.25V. 1.8V to 5.25V Supply Dual LNA Gain Setting: +13.5dB/-14dB at 2.5GHz Double-Balanced Mixer Internal LO Buffer LNA Input Internally Matched Low Supply Current: 23mA Low Shutdown Current: 2A 24-Lead Narrow SSOP Package The LNA can be set to either high gain or low gain mode. At 2.5GHz, the high gain mode provides 13.5dB gain and a noise figure (NF) of 4dB. The LNA in low gain mode provides -14dB gain and an IIP3 of + 8dBm at 2.5GHz. U APPLICATIO S The mixer has 5dB of conversion gain and an IIP3 of - 2.5dBm at 2.5GHz, with -10dBm LO input power. IEEE 802.11 and 802.11b DSSS and FHSS High Speed Wireless LAN Wireless Local Loop , LTC and LT are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. U TYPICAL APPLICATIO GAIN SELECT ENABLE 100pF 100pF LT5500 EN RF INPUT FILTER 2V L4 LO - LNA_GND LO + 2V C4 C17 L3 LO INPUT VCC 100pF x4 1nF LO MIX_GND RF MIX_IN IF IF + L5 * L7 C23 INTERSTAGE FILTER 5.8 13.8 5.6 13.7 5.4 13.6 5.2 13.5 5.0 13.4 4.8 13.3 4.6 13.2 4.4 13.1 4.2 13.0 1.5 2 2.5 3 3.5 4 4.5 5 5.5 4.0 VCC (V) T2 8:1 IF OUTPUT IF - L9 6.0 fRF = 2.5GHz 13.9 TA = 25C MIXER CONVERSION GAIN (dB) GND 14.0 L2 LNA_OUT LNA GAIN (dB) LNA_IN RF INPUT 1F LNA Gain (High Gain Mode) and Mixer Conversion Gain 100pF x2 GS * 5500 TA02 2V 100pF 5500 F01 Figure 1. 2.5GHz Receiver. Interstage Filter is Optional 5500f 1 LT5500 W U U U W W W ABSOLUTE MAXIMUM RATINGS PACKAGE/ORDER I FOR ATIO (Note 1) Power Supply Voltage ........................................... 5.5V LNA RF Input Power ............................................ 5dBm Mixer RF Input Power ........................................ 10dBm LO Input Power (Note 2) ................................... 10dBm All Other Pins ......................................................... 5.5V Operating Ambient Temperature Range ............................... - 40C to 85C Storage Temperature Range ................ - 65C to 150C Lead Temperature (Soldering, 10 sec)................. 300C ORDER PART NUMBER TOP VIEW EN 1 24 GS VCC 2 23 GND LNA_IN 3 22 LNA_OUT GND 4 21 VCC LNA_GND 5 20 GND LNA_GND 6 19 LO - LNA_GND 7 18 LO + LNA_GND 8 VCC 9 17 VCC 16 GND MIX_GND 10 GND 11 IF + 12 LT5500EGN 15 MIX_IN 14 GND 13 IF - GN PACKAGE 24-LEAD PLASTIC SSOP TJMAX = 150C, JA = 85C/W Consult LTC Marketing for parts specified with wider operating temperature ranges. ELECTRICAL CHARACTERISTICS (Test circuit shown in Figure 3 for 1.8GHz application) VCC = 3V DC, LNA: fLNA_IN = 1.8GHz, Mixer: fMIX_IN = 1.8GHz, fLO = 1.52GHz, PLO = -10dBm, TA = 25C, unless otherwise noted. (Notes 3, 4) SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS LNA High Gain: EN = 1.35V, GS = 1.35V Frequency Range (Note 3) Forward Gain 15.5 Reverse Gain (Isolation) 1.8 to 2.7 GHz 18.5 dB -39 dB Noise Figure Terminated 50 Source 2.5 dB Input Return Loss No External Matching 10.5 dB Output Return Loss With External Matching 15 dB -24 dBm -12 dBm 1.8 to 2.7 GHz Input 1dB Compression Input 3rd Order Intercept Two Tone Test, f = 2MHz -18 LNA Low Gain: EN = 1.35V, GS = 0.3V Frequency Range (Note 4) Forward Gain -10 dB Reverse Gain (Isolation) -13 -34 dB Noise Figure 16.5 Input 1dB Compression Input 3rd Order Intercept Two Tone Test, f = 2MHz 4.5 dB 0 dBm 9 dBm 1.8 to 2.7 GHz 8.5 dB Mixer: EN = 1.35V, GS = 1.35V RF Frequency Range (Note 4) Conversion Gain SSB Noise Figure 5.5 Terminated 50 Source Input P1dB Input 3rd Order Intercept Two Tone Test, f = 2MHz -6 7.5 dB -13 dBm - 2.5 dBm 5500f 2 LT5500 ELECTRICAL CHARACTERISTICS (Test circuit shown in Figure 3 for 1.8GHz application) VCC = 3V DC, LNA: fLNA_IN = 1.8GHz, Mixer: fMIX_IN = 1.8GHz, fLO = 1.52GHz, PLO = -10dBm, TA = 25C, unless otherwise noted. (Notes 3, 4) SYMBOL PARAMETER LO Frequency Range (Note 4) IF Frequency Range (Note 3) LO-IF Isolation LO-RF Isolation RF-LO Isolation CONDITIONS Matching Required Matching Required MIN TYP MAX 0.01 to 3.15 10 to 450 36 36 40 UNITS GHz MHz dB dB dB (Test circuit shown in Figure 3 for 2.5GHz application) VCC = 3V DC, LNA: fLNA_IN = 2.5GHz, Mixer: fMIX_IN = 2.5GHz, fLO = 2.22GHz, PLO = -10dBm, TA = 25C, unless otherwise noted. SYMBOL PARAMETER LNA High Gain: EN = 1.35V, GS = 1.35V Forward Gain Reverse Gain (Isolation) Noise Figure Input Return Loss Output Return Loss Input 1dB Compression Input 3rd Order Intercept LNA Low Gain: EN = 1.35V, GS = 0.3V Forward Gain Reverse Gain (Isolation) Noise Figure Input 1dB Compression Input 3rd Order Intercept Mixer: EN = 1.35V, GS = 1.35V Conversion Gain SSB Noise Figure Input P1dB Input 3rd Order Intercept LO-IF Isolation LO-RF Isolation RF-LO Isolation CONDITIONS MIN TYP MAX UNITS Two Tone Test, f = 2MHz 13.5 -35 4 12 15 -15 -3.5 dB dB dB dB dB dBm dBm Two Tone Test, f = 2MHz -14 -39 19 -1 8 dB dB dB dBm dBm 5 9.5 -11 - 2.5 33 37 32 dB dB dBm dBm dB dB dB Terminated 50 Source No External Matching With External Matching Terminated 50 Source Two Tone Test, f = 2MHz VCC = 3V DC, TA = 25C (Note 4) SYMBOL PARAMETER Power Supply VCC Supply Voltage ICC HG Rx High Gain Mode ICC LG Rx Low Gain Mode ICC Off Shutdown Current IEN Enable Current IGS Gain Select Current CONDITIONS MIN EN = 1.35V, GS = 1.35V EN = 1.35V, GS = 0.3V EN = 0.3V, GS = 0.3V EN = 1.35V (Note 5) GS = 1.35V (Note 6) Note 1: Absolute Maximum Ratings are those values beyond which the life of the device may be impaired. Note 2: LO Absolute Maximum Ratings apply for each LO pin separately. Note 3: Component values listed in Figure 3 for 1.8GHz evaluation board were used to guarantee 1.8GHz performance. TYP 1.8 to 5.25 23 18 2 21 21 MAX 33 31 25 UNITS V mA mA A A A Note 4: Specifications over the -40C to 85C operating temperature range are assured by design, characterization and correlation with statistical process controls. Note 5: When EN 0.3V, enable current is <10A. Note 6: When GS 0.3V, gain select current is <10A. 5500f 3 LT5500 U W TYPICAL PERFOR A CE CHARACTERISTICS 0 20 -40C, 1.8GHz -2 25C, 1.8GHz -4 18 IIP3 (dBm) 16 15 14 4.5 -40C, 2.5GHz -8 -40C, 1.8GHz -10 25C, 1.8GHz -12 85C, 1.8GHz -14 -40C, 2.5GHz -16 85C, 2.5GHz 13 12 1.5 2.5 3 3.5 4 4.5 SUPPLY VOLTAGE (V) 5 1.5 5.5 2 3 3.5 2.5 4 4.5 SUPPLY VOLTAGE (V) 5 19.5 IIP3 (dBm) -40C, 2.5GHz 85C, 2.5GHz 25C, 1.8GHz 25C, 2.5GHz 8 -13.0 -40C, 1.8GHz 6 25C, 2.5GHz -14.0 -14.5 1.5 2 2.5 3 3.5 4 4.5 SUPPLY VOLTAGE (V) 5 4 1.5 5.5 2 4 4.5 2.5 3 3.5 SUPPLY VOLTAGE (V) 5500 G04 85C, 1.8GHz 25C, 2.5GHz 6 1.8GHz 2.5 3.5 4.5 SUPPLY VOLTAGE (V) 5.5 5500 G06 Mixer SSB Noise Figure vs Supply Voltage TA = 25C 2.5GHz 9.5 85C, 2.5GHz -1 85C, 1.8GHz 25C, 2.5GHz -2 25C, 1.8GHz -3 -40C, 2.5GHz 5 5 5.5 5500 G07 8.5 8.0 1.8GHz 7.5 -5 -6 1.5 9.0 -40C, 1.8GHz -40C, 2.5GHz 85C, 2.5GHz 4 4.5 2.5 3 3.5 SUPPLY VOLTAGE (V) 17.0 10.0 -4 2 17.5 0 25C, 1.8GHz IIP3 (dBM) CONVERSION GAIN (dB) 1 -40C, 1.8GHz 7 18.0 16.0 1.5 5.5 2 8 18.5 Mixer IIP3 vs Supply Voltage and Temperature 10 9 2.5GHz 5500 G05 Mixer Conversion Gain vs Supply Voltage and Temperature 4 1.5 5 TA = 25C 16.5 -40C, 2.5GHz 85C, 2.5GHz NOISE FIGURE (dB) GAIN (dB) -11.5 NOISE FIGURE (dB) 10 25C, 1.8GHz 5.5 19.0 85C, 1.8GHz -11.0 5 LNA Noise Figure vs Supply Voltage (Low Gain Mode) 12 85C, 1.8GHz 4 4.5 2.5 3 3.5 SUPPLY VOLTAGE (V) 2 5500 G03 -40C, 1.8GHz -13.5 1.8GHz 2.0 1.5 5.5 LNA IIP3 vs Supply Voltage and Temperature (Low Gain Mode) -10.0 -12.5 3.0 5500 G02 LNA Gain vs Supply Voltage and Temperature (Low Gain Mode) -12.0 3.5 -18 5500 G01 -10.5 2.5GHz 2.5 -20 2 TA = 25C 4.0 85C, 2.5GHz -6 85C, 1.8GHz 17 25C, 2.5GHz 25C, 2.5GHz NOISE FIGURE (dB) 19 GAIN (dB) LNA Noise Figure vs Supply Voltage (High Gain Mode) LNA IIP3 vs Supply Voltage and Temperature (High Gain Mode) LNA Gain vs Supply Voltage and Temperature (High Gain Mode) 2 2.5 3 3.5 4 4.5 SUPPLY VOLTAGE (V) 5 5.5 5500 G08 7.0 1.5 2 4 4.5 2.5 3 3.5 SUPPLY VOLTAGE (V) 5 5.5 5500 G09 5500f 4 LT5500 U W TYPICAL PERFOR A CE CHARACTERISTICS Mixer SSB Noise Figure vs LO Power Mixer IIP3 vs LO Power 9 -1.0 8 -1.2 1.8GHz 15 IF = 280MHz VCC = 3V TA = 25C -1.4 7 13 4 3 NOISE FIGURE (dB) 2.5GHz 5 -1.8 -2.0 1.8GHz -2.2 -2.4 2 1 0 0 -30 -5 -15 -20 -10 P(LO) (dBm) LNA Input Return Loss vs Supply Voltage 18 RF = 2.5GHz 14 TA = 25C 9 8 12 10 8 3.5 6 -50 5.5 VCC (V) 12 6 1.5 100 0 50 TEMPERATURE (C) ICC vs Supply Voltage (Low Gain Mode) 26 85C 25 23 85C 24 ICC (mA) ICC (mA) 16 5.5 28 27 10 4.5 5500 G15 29 12 3.5 2.5 VCC (V) 31 LOW GAIN LOW GAIN 14 ICC vs Supply Voltage (High Gain Mode) HIGH GAIN RETURN LOSS (dB) 16 5500 G14 RF = 2.5GHz VCC = 3V 14 HIGH GAIN 18 8 5500 G13 LNA Output Return Loss vs Temperature -30 10 LOW GAIN 4.5 -25 RF = 2.5GHz 22 TA = 25C LOW GAIN 2.5 -20 -15 P(LO) (dBm) 20 14 7 6 1.5 -10 24 RETURN LOSS (dB) RETURN LOSS (dB) RETURN LOSS (dB) 10 -5 LNA Output Return Loss vs Supply Voltage HIGH GAIN 11 0 5500 G11 RF = 2.5GHz VCC = 3V 16 HIGH GAIN 12 18 7 -30 LNA Input Return Loss vs Temperature 15 20 -25 5500 G12 5500 G10 13 2.5GHz 10 1.8GHz -3.0 -25 11 8 -2.8 -10 -15 -20 P(LO) (dBm) -5 0 12 9 2.5GHz -2.6 IF = 280MHz VCC = 3V TA = 25C IF = 280MHz VCC = 3V TA = 25C 14 -1.6 6 IIP3 (dBm) CONVERSION GAIN (dB) Mixer Conversion Gain vs LO Power 25C 22 20 25C 21 18 19 16 17 14 -40C 8 -40C 6 -50 50 0 TEMPERATURE (C) 100 15 1.5 2.5 3.5 4.5 5.5 VCC (V) 5500 G16 12 1.5 2.5 3.5 4.5 5.5 VCC (V) 5500 G17 5500 G18 5500f 5 LT5500 U U U PIN FUNCTIONS EN (Pin 1): Enable Pin. A voltage less than 0.3V (Logic Low) disables the part. An input greater than 1.35V (Logic High) enables the part. This pin should be bypassed to ground with a 100pF capacitor. To shut down the part, this pin and GS (Pin 24) must be logic low. Voltage on this pin should not exceed VCC nor fall below ground. The output can be taken differentially or transformed into a single ended output, depending on user preference and performance requirements. VCC (Pins 2, 9, 17, 21): Power Supply Pins. See Figure 6 for recommended power supply bypassing. LO +, LO - (Pins 18, 19): LO Input Pins. These pins are used to provide the LO drive to the mixer. The signal can be provided either single ended or differentially. These pins are internally biased to VCC - 0.2V and must be AC coupled. LNA_IN (Pin 3): LNA Input Pin. The LT5500 has better than 10dB input return loss from 1.8GHz to 2.7GHz. This pin is internally biased to 0.8V and must be AC coupled. GND (Pin 4, 11, 14, 16, 20, 23): Ground Pins. These pins should be connected directly to ground. LNA_GND (Pins 5, 6, 7, 8): LNA Ground Pins. These pins control the gain of the LNA. At higher frequencies, these pins must be connected directly to ground to maximize the gain. MIX_GND (Pin 10): Mixer Ground Pin. To optimize the performance of the mixer, a 4.7nH inductor to ground is required for this pin. IF +, IF - (Pins 12, 13): Intermediate Frequency (IF) Mixer Output Pins. These pins must be inductively tied to VCC. MIX_IN (Pin 15): Mixer RF Input. This pin is internally biased to 0.83V and must be AC coupled. An external matching network is necessary to match to a 50 system. LNA_OUT (Pin 22): The Output Pin for the LNA. An external matching network is necessary to match to a 50 system. This pin must be DC coupled to the power supply. GS (Pin 24): Gain Select Pin. This pin is used to select between high gain and low gain modes. High gain mode is selected when an input voltage greater than 1.35V (Logic High) is applied to this pin. Low gain mode is selected when the applied voltage is less than 0.3V (Logic Low). This pin should be bypassed to ground with a 100pF capacitor. To shut down the part, this pin must be logic low. Voltage on this pin should not exceed VCC nor fall below ground. 5500f 6 LT5500 W BLOCK DIAGRA 1 EN 3 4, 11, 14, 16, 20, 23 5 6 7 8 2, 9, 17, 21 LT5500 GS 24 BIAS LNA_IN LNA_OUT 22 GND LNA_GND LO - 19 LO + 18 VCC LO 10 MIX_GND RF MIX_IN 15 IF IF + IF - 12 13 5500 BD Figure 2. LT5500 Block Diagram U W U U APPLICATIONS INFORMATION The LT5500 consists of an LNA, a Mixer, an LO buffer and the associated bias circuitry. The chip is designed to be compatible with IEEE802.11b wireless local area network (WLAN), MMDS and other wireless applications. The LNA and Mixer are designed to operate over an input frequency range of 1.8GHz to 2.7GHz with a supply voltage of 1.8V to 5.25V. The Mixer IF output frequency range is typically 10MHz to 450MHz with proper matching. The typical LO drive is -10dBm. The LO buffer operation is broadband. LNA The LNA has two modes of operation: high gain and low gain. In the high gain mode, the LNA is a cascode amplifier. Package inductance is used to achieve better than 10dB input return loss over the entire frequency range. The input of the LNA must be AC coupled. The linearity of the high gain mode of the LNA can be increased by adding inductance to LNA_GND. This will reduce the gain and improve input return loss while having little impact on the low gain mode. In low gain mode, the LNA uses a capacitively coupled diode and a resistively degenerated cascode to attenuate the incoming signal and maintain a moderate VSWR. The LNA output is an open collector, and the matching circuit requires a shunt inductor connected to the power supply to provide the bias current. The component configuration for matching and example component values are listed in Figure 3. If it is desirable to reduce the gain further and simultaneously broaden the LNA bandwidth, an additional shunt resistor to the power supply can be added to the output to reduce the output quality factor (Q). The LT5500 is designed to allow an interstage bandpass filter to be introduced between the output of the LNA and the input of the Mixer. If such an interstage filter is unnecessary, the output of the LNA can be connected to the Mixer input through a blocking capacitor and small value resistor. Mixer The Mixer consists of a single-ended input differential pair followed by a double-balanced mixer cell. The input matching configuration for the Mixer is shown in Figure 3. The Mixer uses a 4.7nH external inductance to act as a high frequency current source at the MIX_GND pin. Example component values for matching the mixer input are tabulated in Figure 3. 5500f 7 LT5500 U U W U APPLICATIONS INFORMATION GAIN 100pF SELECT ENABLE 100pF VCC 100pF 100pF EN LT5500 BIAS GS L4 LNA_IN L2 LNA_OUT RF OUT RF INPUT GND APPLICATION DEPENDENT COMPONENT VALUES 2.5GHz RF INPUT 1.8GHz 2.7nH 4.7nH L4 4.7nH 12nH L2 1.8nH 4.7nH L3 220pF 220pF C4 10pF 10pF C17 2.7nH 5.6nH L9 1.5pF 1.8pF C23 280MHz IF OUTPUT L7 15nH T1 TC8-1 MINI-CIRCUITS C4 LO - LNA_GND LO + VCC C17 L3 LO INPUT VCC * LO MIX_GND RF L9 MIX_IN IF IF + L5 4.7nH T1 IF OUTPUT * L7 * MIXER RF INPUT C23 IF - VCC C2 100pF *REFER TO FIGURE 6 FOR POWER SUPPLY PINS BYPASSING RECOMMENDATION 5500 F03 Figure 3. Simplified Test Schematic for 1.8GHz and 2.5GHz Applications An IF transformer can be used to create a single-ended output. The additional discrete components necessary to achieve a 50 match are tabulated in Figure 3. Alternatively, the discrete solution shown in Figure 4 can be used to perform differential to single-ended conversion. For best LO and RF signal suppression at the IF output, a transformer should be used. If it is desirable to reduce the gain of the mixer, a resistor between the IF outputs can be used. 12 IF + LT5500 IF - 19 LO - 100pF C14 50 IF OUTPUT The LO inputs can be driven either differentially or single ended. A single-ended configuration is shown along with example component values in Figure 3. Optionally, the LO can be driven differentially as shown in Figure 5. 13 VCC L11 L10 LO Buffer IF OUTPUT 280MHz L10, L11 27nH C12 3.3pF C14 2.2pF TX1 4:1 LO INPUT LT5500 LO + L3 18 5500 F05 C12 5500 F04 Figure 4. Alternative Mixer IF Output Matching LO INPUT 2.22GHz L3 3.3nH TX1 TOKO-BF4 Figure 5. Optional Transformer-Based Differential LO Drive 5500f 8 LT5500 U U W U APPLICATIONS INFORMATION Modes of Operation evaluation of both transformer based and discrete component based matching. The LT5500 has three operating modes: 1. Shutdown 2. LNA High Gain 3. LNA Low Gain For shutdown, the EN pin and the GS pin must be at logic Low. Logic Low is defined as a control voltage below 0.3V. LNA High gain mode requires that both EN and GS pins be at logic High. Logic High is defined as a control voltage above 1.35V. LNA Low gain mode requires that the EN pin be at logic High and that the GS pin be at logic Low. Mixer operation is independent of the GS pin. The Mixer is enabled when the EN pin is at logic High. Table 1: Mode Selection EN GS LNA MIXER High High High Gain On High Low Low Gain On Low Low Shutdown Shutdown Evaluation Board Figure 6 shows the circuit schematic of the evaluation board. Each signal terminal of the evaluation board has provisions for three matching components in a T-formation. In practice, two or fewer components are needed to achieve the match. In the case of the LNA input, no external components are necessary if the band select filter provides the necessary AC coupling. Otherwise AC coupling must be provided. A similar consideration applies to the Mixer input pin. The LO terminal of the evaluation board was designed to permit evaluation of both single ended and differential matching configurations. The differential configuration anticipates the use of a transformer. Similarly, the IF output board layout was designed to permit The evaluation board employs primarily 0402 surface mount components, particularly near the signal paths. All surface mount inductors must have a high self-resonance frequency. The component values necessary for 1.8GHz and 2.5GHz applications are tabulated in Figure 3. RF Layout Tips * Use 50 impedance transmission lines up to the matching networks. Use of ground planes is a must, particularly beneath the IC. * Keep the matching networks as close to the pins as possible. * Surface mount 0402 outline (or smaller) parts are recommended to minimize parasitic capacitances and inductances. * Improve LO isolation and maximize component density by putting the LO signal trace on the bottom of the board. This permits either the matching components or an interstage filter to be placed directly between the LNA output and the Mixer input. * Place bypass capacitors to ground in close proximity to the pull-up inductors on the LNA and Mixer outputs to improve component behavior and assure a good smallsignal ground. * VCC lines must be decoupled with low impedance, broadband capacitors to prevent instability. The capacitors should be placed as close as possible to the VCC pins. * Avoid use of long traces whenever possible. Long RF traces in particular lead to signal radiation, degraded isolation and higher losses. 5500f 9 LT5500 U W U U APPLICATIONS INFORMATION VCC2 R1 5.1k E1 R2 5.1k VCC1 E2 4 3 C2 1F 2 J2 LNA_IN R3 0 R4 0 C6 1F 3 4 5 6 7 C9 100pF 8 9 10 L5 4.7nH 11 12 1 2 C24 100pF C22 100pF C25 100pF C3 100pF 1 SW1 EN VCC GS LT5500 LNA_IN GND GND LNA_OUT VCC LNA_GND GND LNA_GND LO- LNA_GND LO + LNA_GND VCC VCC MIX_GND GND IF + GND MIX_IN GND IF - VCC1 24 L4 2.7nH L2 4.7nH VCC1 23 22 C16 8.2pF J1 LNA_OUT 21 20 19 C4 220pF C17 10pF C5 100pF 18 C8 1F R6 0 J3 LO_IN L3 1.8nH 17 C10 100pF 16 15 14 L6 2.7nH 13 C28 1.5pF 3 T1 4 2 C13 1nF C1 100pF C15 100pF 1* R5 0 *6 L7 15nH J5 MIX_IN J6 IF_OUT E4 E5 5500 F06 Figure 6. 2.5GHz Evaluation Circuit Schematic 5500f 10 LT5500 U W U U APPLICATIONS INFORMATION Figure 7. Component Side Silkscreen of Evaluation Board Figure 8. Component Side Layout of Evaluation Board Figure 9. RF Ground (Layer 2) Layout of Evaluation Board Figure 10. Routing (Layer 3) Layout of Evaluation Board Figure 11. Bottom Side Silkscreen of Evaluation Board Figure 12. Bottom Side Layout of Evaluation Board 5500f 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. 11 LT5500 U PACKAGE DESCRIPTION GN Package 24-Lead Plastic SSOP (Narrow .150 Inch) (Reference LTC DWG # 05-08-1641) .337 - .344* (8.560 - 8.738) .033 (0.838) REF 24 23 22 21 20 19 18 17 16 15 1413 .045 .005 .229 - .244 (5.817 - 6.198) .254 MIN .150 - .157** (3.810 - 3.988) .150 - .165 1 .0165 .0015 2 3 4 5 6 7 8 9 10 11 12 .0250 TYP RECOMMENDED SOLDER PAD LAYOUT .015 .004 x 45 (0.38 0.10) .007 - .0098 (0.178 - 0.249) .053 - .068 (1.351 - 1.727) .004 - .0098 (0.102 - 0.249) 0 - 8 TYP .016 - .050 (0.406 - 1.270) .008 - .012 (0.203 - 0.305) NOTE: 1. CONTROLLING DIMENSION: INCHES INCHES 2. DIMENSIONS ARE IN (MILLIMETERS) 3. DRAWING NOT TO SCALE *DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE **DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE .0250 (0.635) BSC GN24 (SSOP) 0502 RELATED PARTS PART NUMBER DESCRIPTION COMMENTS LT5502 400MHz Quadrature Demodulator with RSSI 1.8V to 5.25V Supply, 70MHz to 400MHz IF, 84dB Limiting Gain, 90dB RSSI Range LT5503 1.2GHz to 2.7GHz Direct IQ Modulator and Upconverting Mixer 1.8V to 5.25V Supply, Four-Step RF Power Control, 120MHz Modulation Bandwidth LT5504 800MHz to 2.7GHz RF Measuring Receiver 80dB Dynamic Range, Temperature Compensated, 2.7V to 5.5V Supply LTC5505 300MHz to 3.5GHz RF Power Detector >40dB Dynamic Range, Temperature Compensated, 2.7V to 6V Supply LT5506/LTC5446 500MHz Quadrature IF Demodulator with VGA 1.8V to 5.25V Supply, 40MHz to 500MHz IF, Linear Power Gain LTC5507 100kHz to 1GHz RF Power Detector 48dB Dynamic Range, Temperature Compensated, 2.7V to 6V Supply LTC5508 300MHz to 7GHz RF Power Detector SC70 Package LTC5509 300MHz to 3GHz RF Power Detector 36dB Dynamic Range, SC70 Package LT5511 High Signal Level Upconverting Mixer RF Output to 3GHz, 17dBm IIP3, Integrated LO Buffer LT5512 High Signal Level Downconverting Mixer DC-3GHz, 20dBm IIP3, Integrated LO Buffer LT5515 1.5GHz to 2.5GHz Direct Conversion Quadrature Demodulator 20dBm IIP3,Integrated LO Quadrature Generator LT5516 0.8GHz to 1.5GHz Direct Conversion Quadrature Demodulator 21.5dBm IIP3,Integrated LO Quadrature Generator LT5522 600MHz to 2.7GHz High Signal Level Mixer 25dBm IIP3 at 900MHz, 21.5dBm IIP3 at 1.9GHz, Single-Ended 50 Matched RF and LO Ports, Integrated LO Buffer LTC5532 300MHz to 7GHz Precision RF Power Detector Precision VOUT Offset Control, Adjustable Gain and Offset Voltage ThinSOT is a trademark of Linear Technology Corporation. 5500f 12 Linear Technology Corporation LT/TP 0305 1K * PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 FAX: (408) 434-0507 www.linear.com (c) LINEAR TECHNOLOGY CORPORATION 2005