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TRF4900 Datasheet(PDF) 2 Page - Texas Instruments |
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TRF4900 Datasheet(HTML) 2 Page - Texas Instruments |
2 / 23 page TRF4900 SINGLE-CHIP RF TRANSMITTER SLWS092F – JULY 2000 – REVISED JANUARY 2002 2 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 ISM band standards Europe has assigned a new unlicensed frequency band of 868 MHz to 870 MHz. This new band is specifically defined for short range devices with duty cycles from 0.1% to 100% in several sub-bands. The existing 433-MHz band for short-range devices in Europe has the great disadvantage of very high usage. The new European frequency band, due to the duty cycle assignment, allows a reliable RF link and makes many new applications possible. The North American unlicensed ISM (industrial, scientific, and medical) band covers 902 MHz to 928 MHz (center frequency of 915 MHz) and is suitable for short range RF links. transmitter The transmitter consists of an integrated VCO, a complete fully-programmable direct digital synthesizer, and a power amplifier. The internal VCO can be used with an external tank circuit or an external VCO. The divider, prescaler, and reference oscillator require only the addition of an external crystal and a loop filter to provide a complete DDS with a typical frequency resolution of 230 Hz. The 8-bit FSK frequency deviation register determines the frequency deviation in FSK mode. The modulation itself is done in the direct digital synthesizer, hence no additional external components are necessary. Since the typical RF output power is approximately 7 dBm, no additional external RF power amplifier is necessary in most applications. The TRF4900 RF transmitter is suitable for use in applications that include the TRF6900 RF transceiver. baseband interface The TRF4900 can easily be interfaced to a baseband processor such as the Texas Instruments MSP430 ultralow-power microcontroller (see Figure 1). The TRF4900 serial control registers are programmed by the MSP430, and the MSP430 performs baseband operations in software. Transmit Data Lock Detect Mode Select Serial Control Data Serial Control Clock Serial Control Strobe TX_DATA LOCKDET MODE STDBY DATA CLOCK STROBE PA_OUT TRF4900 TRANSMITTER + DISCRETES RF Section Programmable Digital I/O Pins MSP430 Family µC Microcontroller Section Antenna Standby RF Out Figure 1. System Block Diagram for Interfacing to the MSP430 Microcontroller |
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