BT2577

The BT2577 is a high-performance transceiver for worldwide 2.4GHz ISM band applications.  It includes on-chip features such as the LNA, Modulator / Demodulator, RF VCO,  image-rejection mixer and upconversion mixer.

The receiver section of the BT2577 contains a Low Noise Amplifier (LNA), a downconverter (image rejection mixer), IF AMP, Limiter, FM demodulator, data slicer, RSSI, and RF Voltage Control Oscillator (VCO).  The receiver is designed to require a minimal number of external components and pin count for cost effectiveness.

The transmitter BT2577 section will share the same RF VCO with the receiver, but also includes FSK modulator, upconverter, and power amplifier.  The transmitter also requires minimal external components for reducing mass production cost.

Since there is no IF or RF PLL included on the BT2577, the design engineer can choose the most appropriate RF-IF PLL to use based upon their unique system power consumption, cost and performance requirements.
 
Keeping the PLL Synthesizer separate from the rest of the RFIC Transceiver also makes it possible to accomplish lower noise, and higher peformance designs, due to the improved isolation between the high and low frequency synthesizer sections and the RX and TX signal conversion chains.