Wireless 27MHz Dual Receiver

The TRF7900 is a dual integrated RF transceiver designed for human-interface devices (HID). Operating at 27 MHz, it integrates multiple components (PLL, RF Mixer simulated SAW Filter tuning circuit, and miscellaneous passive components) to provide frequency selection from 8 Discrete channels. This integration lowers component, manufacturing and system costs.
The TRF7900 simplifies system design by reducing system component count and manual circuit tuning. By integrating the PLL SAW Filter and RF Mixer the TRF7900 eliminates the manual tuning of RLC circuits required in traditional implementations.
The receiver also generates 8 frequencies that CAN be programmatically selected via the I2C Interface bus for both the mouse channel and/or the keyboard channel. Another 6-MHz Clock is internally generated to Clock the USB microcontroller; this enables a single crystal to be used to supply the Clock needs for the receiver channels and the Microcontroller
The optimized receiver design enables simultaneous reception on both parallel channels up to 5 kHz (10 kbps Miller encoding) per channel. A receive strength signal indicator Register CAN be read via the I2C bus to determine the signal strength. Correlating the RSSI reading to the packet error rate enables the controller to diagnose the signal and understand the user condition.
By Texas Instruments
TRF7900A 's PackagesTRF7900A 's pdf datasheet

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TRF7900A Application circuits
TRF7900A circuits
This is one application circuit of TRF7900A,If you need more circuits,please download TRF7900A's pdf datasheet.

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