General Description
A7121 is a monolithic CMOS integrated circuit for wireless applications in 2.4GHz ISM band. The device is provided in a 32-lead plastic QFN5X5 packaging and is designed as a complete GFSK transceiver up to 3Mbps data rate. The chip features a fully programmable frequency synthesizer with integrated VCO circuitry.

FEATUREs
  2400MHz~2484MHz worldwide license free frequency band
  Up to 79 selectable channels
  2.2 V – 2.8 V voltage supply
  Programmable output power up to 0dBm
  Channel switching time < 200us
  1 or 3Mbps high speed data rate
  -20 ºC to 85 ºC operating temperature
  -87dBm sensitivity
  Direct / FIFO mode operation
  Modem interface for low speed, low cost microcontroller
  Low IF architecture with few external components
 
Typical Applications
  Wireless digital audio
  Wireless Mouse and Keyboard
  2.4GHz ISM Band Communication System
  Wireless game pad
  Wireless toy