TRF7900A

Features:

` 23 Discrete Components Intgrated into One Chip
          Only External Components are Bypass and Filter Capacitors, and One Crystal
` RF Tuner, Mixer, Transistors, Passives, Coils, and Ceramic Filter Functionality All on One Chip
` Integrated Phase Locked Loop
` 8 User-Selectable Frequencies
          Each Channel (Mouse and Keyboard) Can Independently Select Any of the Available Frequencies
` Internally Generated 6-MHz Clock to Drive USB Microcontroller
` High Data Throughput Rate
          5-kHz Square Wave Simultaneously per Channel
          10 kbps Miller Encoded Data
` I2C Control Interface
` Received Signal Strength Indicator
` 5-V Supply
` Available in 28-Pin TSSOP (PW) Pacakge


Application

· 27-MHz Wireless Mouse and Keyboard Systems
· Human Interface Devices
· Wireless Control
· Remote Control Toys
· Wireless Headset
· Remote instrumentation


Specifications

		VALUE	UNIT(1)
VSto VS+	Supply voltage	5.5	V
VI	Input voltage	±VS± 0.5	V
VID	Differential input voltage	±2	V
	Continuous power dissipation	See Dissipation Rating Table
TJ	Maximum junction temperature, any condition(2)	150
TJ	Maximum junction temperature, continuous operation, long term reliability(3)	125
Tstg	Storage temperature range	-65 to 150
	Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds	300
	ESD ratings: Human Body Model	4000	V
	ESD ratings: Charged Device Model	1500	V
	ESD ratings: Machine Model	200	V

Description

The TRF7900A 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 TRF7900A simplifies system design by reducing system component count and manual circuit tuning. By integrating the PLL, SAW filter, and RF mixer, the TRF7900A eliminates the manual tuning of RLC circuits required in traditional implementations.