RF2449

Preliminary 8 Typical Applications • CDMA/FM Cellular Systems • Supports Dual-Mode CDMA/AMPS • Supports Dual-Mode CDMA/TACS RF2449 CDMA/FM LOW NOISE AMPLIFIER/MIXER 900MHZ DOWNCONVERTER • General Purpose Downconverter • Commercial and Consumer Systems • Portable Battery-Powered Equipment Product Description The RF2449 is a receiver front-end designed for the receive section of dual-mode CDMA/FM cellular applications. It is designed to amplify and downconvert RF signals, while providing 30dB of stepped gain control range. Features include digital control of LNA gain, mixer gain, LNA IIP3, and power down mode. Another feature of the chip is adjustable IIP3 of the LNA and mixer using an offchip current setting resistor. The LNA IIP3 can be digitally controlled between two levels to reduce current draw in CDMA standby and other conditions where high IIP3 is not required. Noise Figure, IP3, and other specs are designed to be compatible with the IS-98 specification for CDMA cellular communications. The IC is manufactured on an advanced Silicon Bipolar process and packaged in an SSOP-24. Optimum Technology Matching® Applied Si BJT GaAs HBT SiGe HBT GaAs MESFET Si CMOS 24 LO IN 23 GND2 22 GND2 21 VCC2 20 IF2+ 19 IF218 BYPASS 17 IF116 IF1+ 15 GND3A 14 MIX IN 13 GND3B 0.157 0.150 0.0098 0.0040 1 0.344 0.337 0.012 0.008 0.025 0.0688 0.0532 0.2440 0.2284 8°MAX 0°MIN 8 0.0098 0.0075 0.050 0.016 Package Style: SSOP-24 !Si Bi-CMOS ENABLE 1 IP SET 2 IF SEL 3 LNA GAIN 4 MIX GAIN 5 LNA IN 6 VCC1 7 GND1B 8 GND1A 9 LNA OUT 10 11 12 Features • Complete Receiver Front-End • Stepped LNA/Mixer Gain Control • Adjustable LNA/Mixer Bias Current • Adjustable LNA/Mixer IIP3 • Digital LNA IIP3 Control • Meets IS-98 IMD and Single Tone Ordering Information RF2449 RF2449 PCBA CDMA/FM Low Noise Amplifier/Mixer 900MHz Downconverter Fully Assembled Evaluation Board Tel (336) 664 1233 Fax (336) 664 0454 http://www.rfmd.com Functional Block Diagram RF Micro Devices, Inc. 7625 Thorndike Road Greensboro, NC 27409, USA Rev A4 001016 8-75 FRONT-ENDS RF2449 Absolute Maximum Ratings Parameter Supply Voltage Input LO and RF Levels Operating Ambient Temperature Storage Temperature Preliminary Rating -0.5 to +5.0 +6 -40 to +85 -40 to +150 Unit 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). Parameter Overall RF Frequency Range LO Frequency Range IF Frequency Range Specification Min. Typ. Max. Unit Condition T = 25°C, VCC =2.75V, RF=880MHz, LO=990MHz@0dBm, IF = 110MHz, VIPSET