TRF4900

SINGLE-CHIP RF TRANSMITTER

SLWS092F – JULY 2000 – REVISED JANUARY 2002

1

POST OFFICE BOX 655303

and 915-MHz ISM Bands

11-Bit DAC

(VCO) and Phase-Locked Loop (PLL)

230 Hz

Implementation

Modes

Microcontroller

Package (TSSOP)

1

2

3

4

5

6

7

8

9

10

11

12

24

23

22

21

20

19

18

17

16

15

14

13

PW PACKAGE

(TOP VIEW)

PD_OUT1

PLL_VCC

PD_SET

VCO_TANK1

VCO_TANK2

PLL_GND

DIG_GND

CLOCK

DATA

STROBE

MODE

STDBY

PD_OUT2

LOCKDET

PA_OUT

PA_GND

PA_VCC

GND

DIG_VCC

XOSC2

XOSC1

DIG_GND

TX_DATA

NC

description

The TRF4900 single-chip solution is an integrated circuit intended for use as a low cost FSK transmitter to

establish a frequency-agile RF link. The device is available in a 24-lead TSSOP package and is designed to

provide a fully-functional multichannel transmitter. The chip is intended for linear (FM) or digital (FSK) modulated

applications in the new 868-MHz European band and the North American 915-MHz ISM band. The single chip

transmitter operates down to 2.2 V and is expressly designed for low power consumption. The synthesizer has

a typical channel spacing of approximately 230 Hz to allow narrow-band as well as wide-band applications. Due

to the narrow channel spacing of the direct digital synthesizer (DDS), the DDS can be used to adjust the TX

frequency and allows the use of inexpensive reference crystals.

Two fully-programmable operation modes, Mode0 and Mode1, allow extremely fast switching between two

preprogrammed settings (e.g., TX_frequency_0/TX_frequency_1) without reprogramming the device. Each

functional block of the transmitter can be specifically enabled or disabled via the serial interface.

These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam

during storage or handling to prevent electrostatic damage to the MOS gates.

Copyright

 2002, Texas Instruments Incorporated

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 Texas Instruments

standard warranty. Production processing does not necessarily include

testing of all parameters.