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FEATURES
APPLICATIONS
DESCRIPTION
USB or PS/2
Power
I2C Control
12 MHz
Crystal
PCB Loop
Antenna
MSP430
TPS71533
2 Data Channels
6MHz for uP
TRF7900A
TRF7900A
SWRS031 – OCTOBER 2005
Fully Integrated Analog Front-End Dual Receiver Base Unit for 27-MHz Wireless Mouseand Keyboard Systems
•High Data Throughput Rate•23 Discrete Components Intgrated into One – 5-kHz Square Wave Simultaneously perChip Channel– Only External Components are Bypass and – 10 kbps Miller Encoded DataFilter Capacitors, and One Crystal
•I
2
C Control Interface•RF Tuner, Mixer, Transistors, Passives, Coils,
•Received Signal Strength Indicatorand Ceramic Filter Functionality All on One
•5-V SupplyChip
•Available in 28-Pin TSSOP (PW) Pacakge•Integrated Phase Locked Loop•8 User-Selectable Frequencies– Each Channel (Mouse and Keyboard) Can
•27-MHz Wireless Mouse and KeyboardIndependently Select Any of the Available
SystemsFrequencies
•Human Interface Devices•Internally Generated 6-MHz Clock to Drive
•Wireless ControlUSB Microcontroller
•Remote Control Toys•Wireless Headset•Remote instrumentation
The TRF7900A is a dual integrated RF transceiver designed for human-interface devices (HID). Operating at 27MHz, it integrates multiple components (PLL, RF mixer, simulated SAW filter, tuning circuit, and miscellaneouspassive components) to provide frequency selection from 8 discrete channels. This integration lowerscomponent, manufacturing and system costs.
The TRF7900A simplifies system design by reducing system component count and manual circuit tuning. Byintegrating the PLL, SAW filter, and RF mixer, the TRF7900A eliminates the manual tuning of RLC circuitsrequired in traditional implementations.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of TexasInstruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Copyright © 2005, Texas Instruments IncorporatedProducts conform to specifications per the terms of the TexasInstruments standard warranty. Production processing does notnecessarily include testing of all parameters.
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ABSOLUTE MAXIMUM RATINGS
DISSIPATION RATINGS
TRF7900A
SWRS031 – OCTOBER 2005
The receiver also generates 8 frequencies that can be programmatically selected via the I
2
C interface bus forboth the mouse channel and/or the keyboard channel. Another 6-MHz clock is internally generated to clock theUSB microcontroller; this enables a single crystal to be used to supply the clock needs for the receiver channelsand the microcontroller.
The optimized receiver design enables simultaneous reception on both parallel channels up to 5 kHz (10 kbpsMiller encoding) per channel. A receive strength signal indicator register can be read via the I
2
C bus to determinethe signal strength. Correlating the RSSI reading to the packet error rate enables the controller to diagnose thesignal and understand the user condition.
ORDERING INFORMATION
PACKAGED DEVICES PACKAGE TYPE TRANSPORT MEDIA, QUANTITY
TRF7900APW TSSOP - 28 Rails, 50TRF7900APWR TSSOP - 28 Tape and Reel, 2000
over operating free-air temperature range (unless otherwise noted)
VALUE UNIT
(1)
V
S–
to Supply voltage 5.5 VV
S+
V
I
Input voltage ±V
S
±0.5 VV
ID
Differential input voltage ±2 VContinuous power dissipation See Dissipation Rating TableT
J
Maximum junction temperature, any condition
(2)
150 °CT
J
Maximum junction temperature, continuous operation, long term 125 °Creliability(3)
T
stg
Storage temperature range -65 to 150 °CLead temperature 1,6 mm (1/16 inch) from case for 10 seconds 300 °CESD ratings: Human Body Model 4000 VESD ratings: Charged Device Model 1500 VESD ratings: Machine Model 200 V
(1) The absolute maximum ratings under any condition is limited by the constraints of the silicon process. Stresses above these ratings maycause permanent damage. Exposure to absolute maximum conditions for extended periods may degrade device reliability. These arestress ratings only, and functional operation of the device at these or any other conditions beyond those specified is not implied.(2) The maximum junction temperature for continuous operation is limited by package constraints. Operation above this temperature mayresult in reduced reliability and/or lifetime of the device.
POWER RATING
(2)PACKAGE θ
JC
θ
JA
(1)
T
A
≤25 °C T
A
= 85 °C
PW (28) 13.7 56.5 1.77 W 708 mW
(1) This data was taken using the JEDEC standard high-K test PCB.(2) Power rating is determined with a junction temperature of 125 °C. This is the point where distortion starts to substantially increase.Thermal management of the final PCB should strive to keep the junction temperature at or below 125 °C for best performance and longterm reliability.
2
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RECOMMENDED OPERATING CONDITIONS
ELECTRICAL CHARACTERISTICS
TRF7900A
SWRS031 – OCTOBER 2005
over operating free-air temperature range (unless otherwise noted)
MIN NOM MAX UNIT
V
S–
to V
S+
Suppy voltage, analog 4.0 5.5 V
V
S
= 5 V, T
A
= 25 °C (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
I
O
Output current 100 100 mA
RF Specifications
Precision of required external 50 ppm12-MHz crystalChannel spacing 50 kHz26.995 MHz27.045 MHz27.095 MHz27.145 MHzCommunication spacing
27.195 MHz27.295 MHzOptional channel 27.245 MHzOptional channel 26.945 MHzDC Differential <100 k ΩAntenna Input Resistance
27 MHz 5 k ΩR
O
Output resistance, Out_1 and Out_2 1.2 k Ω
3
TAPE AND REEL INFORMATION
*All dimensions are nominal
Device Package
Type Package
Drawing Pins SPQ Reel
Diameter
(mm)
Reel
Width
W1 (mm)
A0
(mm) B0
(mm) K0
(mm) P1
(mm) W
(mm) Pin1
Quadrant
TRF7900APWR TSSOP PW 28 2000 330.0 16.4 6.9 10.2 1.8 12.0 16.0 Q1
PACKAGE MATERIALS INFORMATION
www.ti.com 14-Jul-2012
Pack Materials-Page 1
*All dimensions are nominal
Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm)
TRF7900APWR TSSOP PW 28 2000 367.0 367.0 38.0
PACKAGE MATERIALS INFORMATION
www.ti.com 14-Jul-2012
Pack Materials-Page 2
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