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TRF6903PTG4 Datasheet(PDF) 3 Page - Texas Instruments |
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TRF6903PTG4 Datasheet(HTML) 3 Page - Texas Instruments |
3 / 39 page TRF6903 SINGLECHIP MULTIBAND RF TRANSCEIVER SWRS022D − MARCH 2004 − REVISED JUNE 2005 3 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 transmitter The transmitter consists of an integrated VCO and tank circuit, a complete integer-N synthesizer, and a power amplifier. The dividers, prescaler, and reference oscillator require only the addition of an external crystal and a loop filter to provide a complete PLL with a typical frequency resolution of better than 200 kHz. Since the typical RF output power is approximately 8 dBm, no additional external RF power amplifier is necessary in most applications. Four attenuation settings for the power amplifier are offered. This feature allows the user to fine tune the amplifier for optimal output power. receiver The integrated receiver is intended to be used as a single-conversion FSK/OOK receiver. It consists of a low noise amplifier, mixer, limiter, FM/FSK demodulator with an external LC tank circuit or ceramic resonator, LPF amplifier, and a data slicer with clock recovery and an integrated data bit synchronizer. The received strength signal indicator (RSSI) can also be used for fast carrier sense on/off keying, or amplitude shift keying, (OOK/ASK) demodulator. baseband interface The TRF6903 can easily be interfaced to a baseband processor such as the Texas Instruments MSP430 ultralow-power microcontroller (see Figure 1). The TRF6903 serial control registers are programmed by the MSP430 and the MSP430 performs baseband operations in the software. A synchronized data clock, programmable for most common data rates, is provided by the TRF6903. This feature reduces the need for extensive oversampling and data decision in the microcontroller during receive. During transmit, the data clock can be used to clock the transmit data from the microcontroller to the TRF6903 at predefined data rates. Data Clock Transmit Data Receive Data Mode Select Serial Control Data Serial Control Clock Serial Control Strobe TX_DATA RX_DATA MODE STDBY DATA CLOCK STROBE LNA_IN1, 2 PA_OUT TRF6903 Transceiver + Discretes RF Section MSP430 Family µC Microcontroller Section Antenna Standby RF In RF Out RSSI Out (Analog Signal) RSSI_OUT Lock Detect Out LOCK_DETECT Brownout Detector Out DET_OUT Learn/Hold Select LEARN/HOLD DCLK Receive Data Flag RX_FLAG Figure 1. System Block Diagram for Interfacing to the MSP430 Microcontroller |
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