PDF RF2870PCBA Data sheet ( Hoja de datos )

Número de pieza	RF2870PCBA
Descripción	CDMA LOW NOISE AMPLIFIER/MIXER 900MHz DOWNCONVERTER
Fabricantes	RF Micro Devices
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No Preview Available ! 0 Typical Applications • CDMA Cellular Systems • JCDMA Cellular Systems • AMPS Cellular Systems RF2870 CDMA LOW NOISE AMPLIFIER/MIXER 900MHz DOWNCONVERTER • General Purpose Downconverter • Commercial and Consumer Systems • Portable Battery-Powered Equipment Product Description The RF2870 is a receiver front-end for CDMA cellular applications. It is designed to amplify and downconvert RF signals, while providing 28.5dB of stepped gain con- trol range. Features include digital control of LNA gain, mixer gain, and power down mode. Another feature of the chip is adjustable IIP3 of the mixer using an off-chip cur- rent setting resistor. Noise figure, IP3, and other specs are designed to be compatible with the IS-98B interim standard for CDMA cellular communications. The IC is manufactured on an advanced Silicon Germanium Bi- CMOS process and is assembled in a 3mmx3mm, 16- pin, QFN package. Optimum Technology Matching® Applied Si BJT GaAs HBT GaAs MESFET Si Bi-CMOS InGaP/HBT SiGe HBT Si CMOS 9GaN HEMT SiGe Bi-CMOS 16 15 14 13 IF OUT+ 1 12 LNA OUT IF OUT- 2 11 LNA EMITTER GND 3 10 LNA IN LO IN 4 9 LNA GAIN 5678 Functional Block Diagram 0.10 C A -A- 3.00 2 PLCS 1.50 TYP 2 PLCS 0.10 C B 0.70 0.65 0.05 C 0.90 0.85 0.05 0.00 3.00 2 PLCS 0.10 C B 2 PLCS 0.10 C A 2.75 SQ -B- 1.37 TYP 0.60 0.24 TYP NOTES: 1. Shaded lead is pin 1. 2 Dimension applies to plated terminal: to be measured between 0.20 mm and 0.25 mm from terminal end. 12° MAX Dimensions in mm. SEATING -C- PLANE 0.10 M C A B 0.30 0.18 2 PIN 1 ID R.20 0.50 0.30 1.65 1.35 SQ. 0.50 Package Style: QFN, 16-Pin, 3x3 Features • 3mmx3mm LNA/Mixer Solution • Adjustable Mixer Current/IIP3 • Meets IMD Tests with Three Gain States/Two Logic Control Lines • Integrated TX LO Buffer Amplifier • All Pins ESD Protected Ordering Information RF2870 CDMA Low Noise Amplifier/Mixer 900MHz Downcon- verter RF2870 PCBA 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 Rev A8 030507 8-1 1 page Pin Function Description 1 IF OUT+ CDMA IF output. Open collector. RF2870 Interface Schematic CDMA+ CDMA- 2 IF OUT- CDMA IF output. Open collector. 3 GND 4 LO IN LO single-end input. Matched to 50Ω. See pin 1. LO IN 70 Ω 5 VCC External bypass capacitor may be required. 6 LO OUT LO output. Internal DC block. Drives 50Ω. 7 TX BUFF Logic input. High enables TX LO output buffer amplifiers. ENABLE TX BUF 8 ENABLE Logic input. Low level powers down the IC. ENABLE 9 LNA GAIN Logic input. See Gain Control State table. LNA GAIN 10 LNA IN Cellular LNA input. CELL LNA IN VCC CELL LNA OUT CELL LNA EMITTER 11 LNA Cellular LNA emitter. A small inductor connects this pin to ground. Cel- See pin 10. EMITTER lular LNA gain can be adjusted by the inductance. 12 LNA OUT Cellular LNA output. Simple external L-C components required for See pin 10. matching and VCC supply. 13 MIX GAIN Logic input. See Gain Control State table. MIX GAIN 14 ISET2 An external resistor R2 connected to this pin sets the current of the mixer. Decreasing resistance increases current. 15 ISET1 Sets internal voltage reference. External resistor required. 16 MIX IN Cellular mixer RF single-end input. Matched to 50Ω. CELL MIX IN Pkg Base GND Ground connection. The backside of the package should be soldered to a top side ground pad which is connected to the ground plane with mul- tiple vias. Rev A8 030507 8-5 5 Page RF2870 Evaluation Board Schematic IF Frequency=183.6MHz J7 CELL MIX IN J2 CDMA IF J4 LO IN VCC J5 LO OUT 50 Ω µstrip 50 Ω µstrip C2 33 nF C12 DNI C10 DNI 50 Ω µstrip 50 Ω µstrip L2 DNI C11 DNI P1-1 C54 33 nF P1-2 C46 33 nF P1-3 C53 33 nF P1-4 C55 33 nF P2 1 ENABLE P3-1 2 TX BUF EN C20 + 1 µF 3 MIX GAIN 4 LNA GAIN CON4 P3 1 VCC1 2 GND 3 GND CON3 C6 33 nF FL2 IF Saw DNI 10 4 95 C8 DNI L26 C17 DNI 8.2 pF VCC L6 L8 220 nH 68 nH R2 9.1 kΩ C22 100 pF L7 DNI C31 DNI C35 DNI C9 0.1 µF C13 1.2 pF L9 3.9 nH C56 DNI 6 GND 3 GND FL4 RF Saw GND 4 GND 1 C3 16 pF C5 16 pF R5 4.3 kΩ 16 1 2 3 4 5 R4 6.8 kΩ 15 14 67 C58 DNI 13 12 11 10 9 8 C69 3.0 pF L21 VCC C25 10 nH 100 pF 50 Ω µstrip L5 1.5 nH C4 33 nF 50 Ω µstrip L1 33 nH C7 33 nF L17 2.2 nH MIX GAIN J8 CELL LNA OUT J9 CELL LNA IN LNA GAIN ENABLE TX BUF EN Evaluation Board Schematic IF Frequency=85.38MHz (Stock Evaluation Boards are at this IF) J6 CELL MIX IN 50 Ω µstrip J1 CDMA IF 50 Ω µstrip C2 33 nF C12 DNI C10 DNI FL2 IF SAW C6 33 nF L2 9 5 C8 DNI 10 4 DNI L26 DNI C11 DNI J2 LO IN 50 Ω µstrip VCC J3 LO OUT 50 Ω µstrip P1-1 P1-2 P1-3 P2 1 ENABLE P3-1 2 TX BUF EN C20 + 1 µF 3 MIX GAIN P1-4 4 LNA GAIN CON4 P3 1 VCC1 2 GND 3 GND CON3 C9 0.1 µF C53 33 nF MIX GAIN C17 18 pF VCC C22 100 pF C31 DNI L8 220 nH L11 150 nH R2 DNI L7 DNI L3 3.9 nH C13 1.2 pF C56 DNI FL6 Filter SAWTEK_2x2_5 C3 43 pF C35 DNI C5 43 pF C7 10 pF R5 4.3 kΩ R4 6.8 kΩ C58 C69 DNI 3.0 pF 16 15 14 13 1 12 L21 VCC C25 10 nH 33 nF 50 Ω µstrip J5 CELL LNA OUT 2 11 L3 L4 L5 L6 DNI 1.2 nH DNI DNI 3 10 49 5678 C55 33 nF C4 33 nF L1 33 nH 50 Ω µstrip J4 CELL LNA IN LNA GAIN ENABLE L17 2.2 nH C54 33 nF 2870400, Rev. - TX BUF EN C46 33 nF Rev A8 030507 8-11 11 Page

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Número de pieza	Descripción	Fabricantes
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