TRF7900A Datasheet, PDF (1/3 Pages) Texas Instruments – Fully Integrated Analog Front-End Dual Receiver Base Unit for 27-MHz Wireless Mouse and Keyboard Systems

TRF7900A
www.ti.com
SWRS031 – OCTOBER 2005
Fully Integrated Analog Front-End Dual Receiver Base Unit for 27-MHz Wireless Mouse
and Keyboard Systems
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
APPLICATIONS
• 27-MHz Wireless Mouse and Keyboard
Systems
• Human Interface Devices
• Wireless Control
• Remote Control Toys
• Wireless Headset
• Remote instrumentation
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.
USB or PS/2
Power
TPS71533
PCB Loop
Antenna
MSP430
I2C Control
2 Data Channels
6MHz for uP
TRF7900A
12 MHz
Crystal
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.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2005, Texas Instruments Incorporated