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TRF4400 Datasheet(PDF) 2 Page - Texas Instruments |
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TRF4400 Datasheet(HTML) 2 Page - Texas Instruments |
2 / 21 page TRF4400 SINGLECHIP 433MHz RF TRANSMITTER SLWS113D −NOVEMBER 2000 − REVISED FEBRUARY 2005 2 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 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 TRF4400 RF transmitter is suitable for use in applications that include the TRF6900 RF transceiver. baseband interface The TRF4400 can easily be interfaced to a baseband processor such as the Texas Instruments MSP430 ultralow-power microcontroller (see Figure 1). The TRF4400 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 TRF4400 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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