RF9904

The RF9904 is a kind of transceiver IC which includes a transmit BPSK modulator, and a receive quadrature demodulator, as well as a splitter for the local oscillator signal, and seperate transmit and receive LO buffer amplifiers. The device operates over the 700 to 1100 MHz ISM band spread-spectrum systems as well as first IF stages for higher-frequency systems. The IC contains all circuits required for quadrature demodulation, using an integrated LO phase shift network, as well as all circuits for bi-phase modulation.

There are some features of RF9904 as follows: (1)single 4.0 to 6.5 V power supply; (2)direct modulation and demodulation; (3)separate RX and TX power down mode; (4)DC to 15 MHz baseband frequency; (5)700 MHz to 1100 MHz RF frequency; (6)compatible with RF2403 front end IC. The typical applications include: (1) digital communication systems; (2)spread spectrum communication systems; (3)915 MHz cordless phones; (4)915 MHz ISM band systems; (5)POS terminals; (6)commercial handheld systems.

The following is about the absolute maximum ratings of RF9904: (1)supply voltage: -0.5 to 7.0 V; (2)RX/TX enable voltage: -0.5 to VCC V; (3)input RF power: +10 dBm; (4)operating ambient temperature: -40 to +85; (5)storage temperature: -40 to +150. Then is about the specifications about the power supply: (1)operating voltage: 4.0 V min and 6.5 V max; (2)RX current consumption: 20 mA min, 25 mA typ and 35 mA max; (3)TX current consumption: 7 mA min, 10 mA typ and 20 mA max; (4)power down current: 200A max when VCC=5.0 V, ENABLE=TX, ENABLE=0 V.