RF2890 0 DUAL-BAND CDMA CELLULAR/GPS LOW NOISE AMPLIFIER/MIXER Typical Applications • CDMA Cellular/GPS Applications • CDMA Modem/Data Cards • JCDMA/GPS Applications • Commercial and Consumer Systems • AMPS/GPS Applications • Portable Battery-Powered Equipment Product Description -A- The RF2890 is a high performance dual band CDMA Cellular and GPS LNA/mixer. An integrated optional LO prescaler allows VCO flexibility. The device is designed to exceed all sensitivity, intermodulation and single-tone requirements. The RF2890 is designed for three state gain control solutions (17.5dB of gain control) for cellular band IMD testing. The device offers a dedicated low current (15.5mA) GPS LNA/mixer with 32.5dB gain. An integrated TX LO buffer is also included. The design is flexible, in that the bias currents may be set using off-chip current reference resistors for the mixer and LNA blocks. Noise figure, IIP3, and other specifications are designed to be compatible with the TIA/EIA 98D standard for CDMA cellular communications. The device is packaged in a plastic, 4mmx4mm QFN. GaAs HBT GaAs MESFET Si Bi-CMOS SiGe HBT Si CMOS InGaP/HBT GaN HEMT ENABLE DIV SEL NC CELL MIX IN ISET1 ISET2 9SiGe Bi-CMOS 24 23 22 21 20 19 2.00 TYP 0.15 C B 2 PLCS 2 PLCS 0.15 C B 1.87 TYP 0.15 C A 2 PLCS -B- 3.75 SQ Top View 0.05 C 0.90 0.85 0.70 0.65 0.10 M C A B 0.60 0.24 TYP 0.05 0.00 0.30 2 0.18 PIN 1 ID 0.20 R Dimensions in mm 2.49 SQ. 2.19 0.50 0.30 TYP 12° MAX -C- SEATING PLANE 0.50 Bottom View NOTES: 1 Shaded lead is pin 1. Optimum Technology Matching® Applied Si BJT 0.15 C A 2 PLCS 4.00 SQ 3 2 Dimension applies to plated terminal: to be measured between 0.20 mm and 0.25 mm from terminal end. 3 Pin 1 identifier must exist on top surface of package by identification mark or feature on the package body. Package Style: QFN, 24-Pin, 4x4 Features • Optional Divide-by-Two LO Prescaler allows VCO Flexibility • Three Gain State Cellular LNA CELL 1 LNA OUT 18 GPS IF+ • High IIP3 (8.5dBm) Cellular Mixer CELL 2 LNA EMITTER 17 GPS IF- • Full ESD Protection on all Pins 16 CDMA IF+ • 15.5mA GPS LNA/Mixer Solution CELL 3 LNA IN GPS 4 LNA IN 15 CDMA IF- /2 14 VG1 5 GPS 6 LNA OUT TX BUFF ENAB 7 8 9 10 11 12 GPS MIX IN VG2 BAND SEL VCC1 LO IN VCC2 13 LO OUT Functional Block Diagram Rev A4 040421 Ordering Information RF2890 RF2890PCBA-410 Dual-Band CDMA Cellular/GPS Low Noise Amplifier/Mixer Fully Assembled Evaluation Board RF Micro Devices, Inc. 7628 Thorndike Road Greensboro, NC 27409, USA Tel (336) 664 1233 Fax (336) 664 0454 http://www.rfmd.com 8-409 RF2890 Absolute Maximum Ratings Parameter Supply Voltage Input LO and RF Levels Operating Ambient Temperature Storage Temperature Parameter Rating Unit -0.5 to +5.0 +6 -40 to +85 -40 to +150 VDC dBm °C °C Caution! ESD sensitive device. RF Micro Devices believes the furnished information is correct and accurate at the time of this printing. However, RF Micro Devices reserves the right to make changes to its products without notice. RF Micro Devices does not assume responsibility for the use of the described product(s). Specification Min. Typ. Max. Unit 800 to 900 1575.42 183.6 400 MHz MHz MHz 2.75 3.15 Overall RF Frequency Range IF Frequency Range 0.1 Condition T = 25°C, VCC =2.75V Cellular band GPS band Power Supply Supply Voltage Logic High Logic Low Power Down Current 2.65 1.8 0.4 10 V V V µA Cellular Band JCDMA Band LNA (High Gain) Gain Noise Figure Input IP3 LNA 50Ω match 13.0 +9.0 Current Isolation 14.5 1.0 +11.0 16.0 1.3 7.0 19 dB dB dBm IIP3 can be increased further by decreasing the value of ISET1. mA dB LNA (Mid Gain) Gain Noise Figure Input IP3 Current ENABLE=0 Freq=869MHz to 894MHz Freq=832MHz to 870MHz LNA 50Ω match 5.5 +9.0 7.0 2.5 +12.0 4.0 8.5 2.8 dB dB dBm mA -3.0 3.0 +23.0 0 -1.5 4.0 dB dB dBm mA LNA (Low Gain) Gain Noise Figure Input IP3 Current -4.0 +20.0 LO IN=-4dBm See Notes 1, 2 and 3. Mixer - CDMA/JCDMA Gain Noise Figure Input IP3 Current LO Frequency Range 10.0 +6.5 IF Frequency Range 0.1 11.5 7.5 +8.5 13.5 2300 dB dB dBm mA MHz 2105.2-2155.2 183.6 400 MHz MHz 27.5 37.0 mA 600 13.0 8.0 High and Low Side LO Injection. See note 3 and 4. /2 enabled, 183.6MHz IF Typical IF frequencies: 111.85MHz, 183.6MHz Cellular Mode (High Gain) Total Current 8-410 LO/2 enabled, TX LO Buffer enabled Rev A4 040421 RF2890 Parameter Specification Min. Typ. Max. Unit GPS Band Freq=1575.42MHz LNA (High Gain) Gain Noise Figure Input IP3 Current Isolation LNA 50Ω match 15.0 +3.5 16.5 1.4 +6.0 7.0 20 18.0 1.7 dB dB dBm mA dB LO IN=-4dBm See note 1. Mixer Gain Noise Figure Input IP3 Current LO Frequency Range IF Frequency Range Condition 16.0 -5.5 1300 125 17.5 7.0 -3.0 8.0 19.0 7.5 183.6 1450 275 dB dB dBm mA MHz MHz 15.5 20.0 mA 1 pF Mixer/LO Input Amps Low Side LO Injection Typical IF frequency: 183.6MHz GPS Mode Total Current Control Lines Input Capacitance BAND SEL, VG1, VG2, ENABLE, DIV SEL, TX BUFF ENAB Local Oscillator Input Cellular - CDMA/FM/JCDMA Input Power GPS Input Power -10 -4 0 dBm -10 -4 0 dBm -7.0 600 -4.5 -2.0 1078 dBm MHz mA TX (Local Oscillator) Buffer Cellular - CDMA/FM/JCDMA Output Power Output Frequency Current Consumption 2 Single-ended 50Ω load See note 3. High and Low Side LO Injection. NOTE 1. Mixer performance can be changed with external IF load/tuning. NOTE 2. Specifications apply for conditions of LO Divider enabled or disabled. NOTE 3. Mixer performance applies to both high and low side LO injection. Rev A4 040421 8-411 RF2890 Evaluation Board Current Measurement BAND SEL ENABLE CDMA Cellular High Gain Mode, TX Buffer Off, /2 Off Mid Gain Mode, TX Buffer Off, /2 Off Low Gain Mode, TX Buffer Off, /2 Off Alternate Low Gain Mode, TX Buffer Off, /2 Off GPS GPS Mode VG1 VG2 TX BUFF ENAB DIV SEL 0 1 0 0 0 1 IDC (mA) ISET2=7.5kΩ 23.5 0 1 1 0 0 1 20.5 0 1 1 1 0 1 16.5 0 1 0 1 0 1 16.5 1 1 X X X 1 ISET2=7.5kΩ 15.5 NOTES: All IDC current numbers include bias circuitry current of 1.5mA to 2.0mA (dependent on mode). TX Buffer On (=1): Add 2mA to total current. DIV SEL On (=0): Add 2mA to total current. “X” denotes setting does not impact current. Cascaded Performance (Typical Values for VCC =2.75V) NOTE: All total current numbers include bias circuitry current of 1.5mA to 2.0mA (dependent on mode). Parameter Cascaded: Gain (dB) Noise Figure (dB) Input IP3 (dBm) HIGH GAIN CELL CDMA MID GAIN LOW GAIN 23.5 2.0 -3.7 16.0 5.5 +3.4 6.0 13.0 +13.5 Total Current (mA) 23.5 20.5 16.5 NOTE: Assumes 2.5dB image filter insertion loss. The TX Buffer is off (TX BUFF ENAB=0). DIV SEL function is off (=1). Parameter GPS Cascaded: Gain (dB) 32.5 Noise Figure (dB) 1.8 Input IP3 (dBm) -18.0 Total Current (mA) 15.5 NOTE: Assumes 1.5dB image filter insertion loss. 8-412 Rev A4 040421 RF2890 Operation Mode Control Table Mode Cellular CDMA GPS BAND SEL 0 1 Gain Control Logic Table Gain Setting VG1 0 1 1 0 VG2 0 0 1 1 Cellular LNA High Gain Mid Gain Low Gain Low Gain Resulting Gain State GPS Comments LNA High Gain Cellular CDMA IMD Test 1 and 2 High Gain Cellular CDMA IMD Test 3 and 4 High Gain Cellular CDMA IMD Test 5 and 6 High Gain Cellular CDMA IMD Test 5 and 6 VCO Options and Divider Logic Table Dual-Band Application Dual VCO Configuration 2GHz CDMA VCO 1.4GHz GPS VCO DIV SEL pin tied to BAND SEL MODE CDMA Cellular GPS CONTROL PINS DIV SELECT 0 1 BAND SEL 0 1 ON-CHIP LO PRESCALER RESULT Divide-by-2 ON OFF Dual-Band Application Dual VCO Configuration 1GHz CDMA VCO 1.4GHz GPS VCO DIV SEL pin tied to VCC MODE CDMA Cellular GPS Rev A4 040421 CONTROL PINS DIV SELECT 1 1 BAND SEL 0 1 ON-CHIP LO PRESCALER RESULT Divide-by-2 OFF OFF 8-413 RF2890 Pin 1 2 3 Function CELL LNA OUT CELL LNA EMITTER CELL LNA IN Type Description AO Cellular LNA output. Simple external L-C components Interface Schematic See pin 3. required for matching and VCC supply. AO Cellular LNA emitter. A small inductor connects this pin to ground. Cellular LNA gain can be adjusted by the inductance. AI Cellular LNA input. See pin 3. VCC CELL LNA OUT CELL LNA IN CELL LNA EMITTER 4 GPS LNA IN AI GPS LNA input. For best performance, simple external matching required. VCC GPS LNA OUT GPS LNA IN 5 VG1 DI Logic input. See Gain Control Logic table. VG1 6 7 GPS LNA OUT GPS MIX IN AO GPS LNA output. Simple external L-C components required for matching and VCC supply. AI GPS mixer RF single-end input. Externally matched to 50Ω. See pin 4. GPS MIX IN 8 VG2 DI Logic input. See Gain Control Logic table. VG2 9 BAND SEL DI Logic input. High level selects GPS band; low level selects cellular band. BAND SEL 10 VCC1 P 11 LO IN AI VCC connection with internal RF bypass capacitor. External bypass capacitor between 1nF and 47nF recommended. LO single-end input. Matched to 50Ω. LO IN 70 Ω 12 VCC2 DI 13 14 LO OUT TX BUFF ENAB AO DI 8-414 VCC connection with internal RF Bypass capacitor. External bypass capacitor between 1nF and 47nF recommended. LO output. Internal DC block. Logic input. High enables TX LO output buffer amplifiers. TX BUFF ENAB Rev A4 040421 RF2890 Pin 15 16 Function CDMA IFCDMA IF+ 17 18 GPS IFGPS IF+ AO AO GPS IF output. Open collector. 19 ISET2 AO 20 ISET1 AO 21 CELL MIX IN AI Resistor to ground sets mixer currents in both bands. Higher resistance results in lower currents. Resistor to ground sets the LNA current in boost mode (both LNAs). Higher resistance results in lower current. Cellular mixer RF single-end input. Externally matched to 50Ω. 22 23 24 NC DIV SEL ENABLE Type Description AO CDMA IF output. Open collector. AO CDMA IF output. Open collector. GPS IF output. Open collector. Interface Schematic See pin 16. CDMA IF+ CDMA IF- See pin 18. GPS IF+ GPS IF- CELL MIX IN No connection. DI DI Logic input. Logic low enables LO divide-by-2 in cellular mode, DIV SEL must be set high in GPS mode. See VCO options table. DIV SEL Logic input. Low level powers down the IC. ENABLE Pkg Base GND P Ground connection. The backside of the package should be soldered to a top side ground pad which is connected to the ground plane with multiple vias. Legend: DI=Digital Input from Baseband Chip AI=Analog Input AO=Analog Output P=VCC or GND Rev A4 040421 8-415 RF2890 Application Schematic Differential Configuration CELL RF SAW 33 nH 33 nH VCC VCC 33 nF 33 nF 10 nH 6.2 pF 16 kΩ 7.5 kΩ DIV ENABLE SEL C4 24 0Ω 0Ω 33 nH 22 21 20 1 18 2 17 3 16 C1 4 1.2 pF C5 R2 VCC 33 nF GPS LNA IN L5 (0603 Wire-wound Coilcraft) 19 33 nF CELL LNA IN 1.8 nH 23 L4 (0603 Wire-wound Coilcraft) L1 L2 (0603 Wire-wound Coilcraft) C2 15 /2 GPS IF (IFSAW2) SAW GPS CDMA IF (IFSAW1) SAW CDMA C6 (0603 Wire-wound Coilcraft) R1 L6 (0603 Wire-wound Coilcraft) L3 (0603 Wire-wound Coilcraft) C3 DNI TX BUFF ENAB 14 5 G1 13 6 LO OUT 33 nF 7 22 nH 30 Ω 4.7 nH 10 pF 8 9 10 12 15 nH 8.2 nH VCC1 GPS RF SAW 5.6 nH 33 nF 33 nF VCC 11 *Note 3 G2 BAND SEL VCC2 LO IN CDMA IF OUTPUT IF Frequency C1 R1 L1 L3 IF SAW1 184 MHz 1.8 pF DNI 68 nH 68 nH 5.6 pF 5.6 pF 47 nH EPCOS B4955 85 MHz 22 pF DNI 68 nH 68 nH 7.5 pF 7.5 pF L2 C2 C3 270 nH LG 0085G2 GPS IF OUTPUT for use with SAW FILTER IF Frequency C4 184 MHz DNI C5 C6 5.6 pF 5.6 pF L4 L5 L6 R2 IF SAW2 180 nH 180 nH 47 nH 10 kΩ Murata SAFCC183MCA1 Note 1: L1, L2, and L3 may be substituted with 0402 wire-wound inductors of the same value. Note 2: For single-ended configurations, C3 and C6 are removed. Note 3: If system specifications allow the removal of the GPS RF SAW Filter, see diagram below for pin 6 and pin 7 connections. 6 7 22 nH 30 Ω 10 pF 4.7 nH 15 nH 33 nF 8.2 nH 33 nF VCC 8-416 Rev A4 040421 RF2890 Application Schematic GPS LC Filter CDMA IF SAW Filter CELL RF SAW 33 nH 33 nH VCC VCC 33 nF 33 nF 10 nH 6.2 pF 16 kΩ L2 7.5 kΩ (0603 Wire-wound Coilcraft) DIV ENABLE SEL L1 C1 24 0Ω 0Ω 33 nH 22 21 20 18 2 17 3 16 C7 33 nF 4 GPS C2 L5 L6 (0603 Wire-wound Coilcraft) (0603 Wire-wound Coilcraft) C8 R1 15 /2 C6 C3 L3 (0603 Wire-wound Coilcraft) C5 L4 (0603 Wire-wound Coilcraft) VCC 33 nF GPS LNA IN 1.2 pF 19 1 CELL LNA IN 1.8 nH 23 (0603 Wire-wound Coilcraft) R1 C4 L7 (0603 Wire-wound Coilcraft) CDMA IF (IFSAW1) SAW CDMA C9 DNI TX BUFF ENAB 14 5 G1 13 6 LO OUT 33 nF 7 22 nH 30 Ω 4.7 nH 10 pF 8 9 11 10 12 33 nF 15 nH 8.2 nH 33 nF VCC1 VCC GPS RF SAW 5.6 nH *Note 4 G2 BAND SEL VCC2 LO IN CDMA IF OUTPUT IF Frequency C7 184 MHz 1.8 pF 85 MHz 22 pF R1 DNI L5 68 nH L6 C8 C9 68 nH 5.6 pF 5.6 pF L7 47 nH IF SAW 1 EPCOS B4955 DNI 68 nH 68 nH 7.5 pF 7.5 pF 270 nH LG LG0085G2 IF Frequency C1 R1 L1 184 MHz DNI 10 kΩ 330 nH GPS IF OUTPUT L2 C2 C3 220 nH 5.6 pF 9 pF L3 C4 C5 L4 C6 82 nH 10 nF 9 pF 82 nH 1 nF Note 1: L3, L4, L5, L6, and L7 may be substituted with 0402 wire-wound inductors of the same value. Note 2: For single-ended configurations, C3 and C6 are removed. Note 3: L1 and L2 must be 0603 wire-wound inductors to achieve datasheet performance. Note 4: If system specifications allow the removal of the GPS RF SAW Filter, see diagram below for pin 6 and pin 7 connections. 6 7 22 nH 30 Ω 10 pF 4.7 nH 15 nH 33 nF 8.2 nH 33 nF VCC Rev A4 040421 8-417 RF2890 Evaluation Board Schematic IF Freq=183.6MHz (Cellular and GPS IF) (Download Bill of Materials from www.rfmd.com.) ENABLE DIV SEL 50 Ω µstrip L66 27 nH VCC C1 33 nF J1 CELL LNA OUT 50 Ω µstrip C16 33 nF L1 8.2 nH C14 3.3 pF C4 33 nF 24 0Ω J2 CELL LNA IN J5 GPS LNA IN 0Ω C15 24 pF 50 Ω µstrip 50 Ω µstrip L6 39 nH C17 33 nF C2 33 nF L16 1.8 nH 23 22 21 C29 1.2 pF DNI C24 33 nF R4 16 kΩ 20 C19 2.0 pF 19 18 2 17 3 16 L4 5.6 nH 4 VCC R5 7.5 kΩ 1 L12 270 nH C32 33 nF 5 14 6 13 L19 22 nH R8 30 Ω J7 GPS MIXER IN 8-418 50 Ω µstrip C33 33 nF C35 10 pF 7 L20 4.7 nH L21 15 nH 8 9 10 11 J12 GPS C18 2.7 pF R3 7.5 kΩ L3 220 nH C11 6.8 pF 50 Ω µstrip 12 C38 33 nF C40 33 nF C41 33 nF J11 CDMA VCC C8 2.7 pF L2 110 nH C43 33 nF 50 Ω µstrip L22 2.2 nH C36 33 nF L9 8.2 nH 50 Ω µstrip R6 22 kΩ C10 33 nF C34 33 nF C26 4.3 pF C20 2.0 pF VG1 J6 GPS LNA OUT L11 150 nH 15 /2 J14 CELL MIXER IN 50 Ω µstrip TX BUF ENAB J9 LO OUT VCC2 J8 LO IN VCC1 VCC BAND SEL 50 Ω µstrip VG2 Rev A4 040421 RF2890 IF Output Interface Network Single-End IF Matching C1 C3 IF+ 10 4 IF- 9 5 IF+ VCC L2 L1 R C2 IF- IF Saw 100 pF C1 L1, C1, C2, and R form a current combiner which performs a differential to single-ended conversion at the IF frequency and sets the output impedance. In most cases, the resonance frequency is independent of R and can be set according to the following equation: 1 f IF = ----------------------------------------------------------L1 2π ------ ( C 1 + 2C 2 + C EQ ) 2 Where CEQ is the equivalent stray capacitance and capacitance looking into pins 9 and 10. An average value to use for CEQ is 2.5pF. R can then be used to set the output impedance according to the following equation: 1 –1 1 R = --------------------- – ------ 4 ⋅ R OUT R P where ROUT is the desired output impedance and RP is the parasitic equivalent parallel resistance of L1. C2 should first be set to 0 and C1 should be chosen as high as possible (not greater than 39pF), while maintaining an RP of L1 that allows for the desired ROUT. If the self-resonant frequencies of the selected C1 produce unsatisfactory linearity performance, their values may be reduced and compensated for by including C2 capacitor with a value chosen to maintain the desired FIF frequency. L2 and C3 serve dual purposes. L2 serves as an output bias choke, and C3 serves as a series DC block. In addition, L2 and C3 may be chosen to form an impedance matching network if the input impedance of the IF filter is not equal to ROUT. Otherwise, L2 is chosen to be large (suggested 120nH) and C3 is chosen to be large (suggested 22nF) if a DC path to ground is present in the IF filter, or omitted if the filter is DC-blocked. Rev A4 040421 8-419 RF2890 Differential IF Matching C2 IF Saw IF+ VCC IF+ IF- 10 4 9 5 L1 R C1 IF- L2 100 pF C2 L1 L1 and C1 are chosen to resonate at the desired IF frequency. C1 can be omitted and the value of L1 increased and utilized solely as a choke to provide VCC to the open-collector outputs, but it is strongly recommended that at least some small-valued C1 (a few pF) be retained for better mixer linearity performance. R is normally selected to match the input impedance of the IF filter. However, mixer performance can be modified by selecting an R value that is different from the IF filter input impedance, and inserting a conjugate matching network between the Resistive Output Network and the IF filter. C2 serve dual purposes. C2 serves as a series DC block when a DC path to ground is present in the IF filter. In addition, C2 may be chosen to improve the combine performance of the mixer and IF filter. L2 should choose to resonate with the internal capacitance of the SAW filter. Usually, SAW filter has some capacitance. Otherwise, L2 could be eliminated. A practical approach to obtain the differential matching is to tune the mixer to the correct load point for gain, IIP3, and NF using the single-end current combiner method. Second, use the component values found in the single-end approach as starting point for the differential matching. The two-shunt capacitors in the single-end could be converted in a parallel capacitor and the parallel inductor in the single-end need to be converted in two-choke inductor. Third, set the DC block capacitors (C2) in the differential-end matching to a high value (i.e., 100pF) and retune the resonate circuit (C1 & L1) and the resistor (R) for optimal performance. After optimal performance is achieved and if performance is not satisfactory, decrease the series capacitors until optimal performance is achieved. 8-420 Rev A4 040421 RF2890 PCB Design Requirements PCB Surface Finish The PCB surface finish used for RFMD’s qualification process is electroless nickel, immersion gold. Typical thickness is 3µinch to 8µinch gold over 180µinch nickel. PCB Land Pattern Recommendation PCB land patterns are based on IPC-SM-782 standards when possible. The pad pattern shown has been developed and tested for optimized assembly at RFMD; however, it may require some modifications to address company specific assembly processes. The PCB land pattern has been developed to accommodate lead and package tolerances. PCB Metal Land Pattern A = 0.64 x 0.28 (mm) Typ. B = 0.28 x 0.64 (mm) Typ. C = 2.50 (mm) Sq. 2.50 Typ. 0.50 Typ. Dimensions in mm. Pin 24 B Pin 1 0.50 Typ. B B B B B Pin 18 A A A A A A C A A A A A A 1.25 2.50 Typ. 0.55 Typ. B B B B B B Pin 12 0.55 Typ. 1.25 Figure 1. PCB Metal Land Pattern (Top View) Rev A4 040421 8-421 RF2890 8-422 Rev A4 040421