TH7111

 Double superhet architecture for high degree of image rejection
 FSK for digital data and FM reception for analog signal transmission
FM/FSK demodulation either with phase-coincidence or PLL demodulator
 Low current consumption in active mode and very low standby current
 Switchable LNA gain for improved dynamic range
AFC feature allows wide carrier frequency acceptance range
RSSI allows signal strength indication and ASK detection
 Surface mount package LQFP44

 PLL synthesizer (PLL SYNTH) for generation of the first and second local oscillator signals LO1 and LO2
 Parts of the PLL SYNTH are the high-frequency VCO1, the feedback dividers DIV_16 and DIV_2,a phase-frequency detector (PFD) with charge pump (CP) and a crystal-based reference oscillator (RO)
Low-noise amplifier (LNA) for high-sensitivity RF signal reception
 First mixer (MIX1) for down-conversion of the RF signal to the first IF (IF1)
second mixer (MIX2) for down-conversion of the IF1 to the second IF (IF2)
 IF amplifier (IFA) to amplify and limit the IF2 signal and for RSSI generation
 Phase coincidence demodulator (DEMOD) with third mixer (MIX3) to demodulate the IF signal
Operational amplifier (OA) for data slicing, filtering, ASK detection and automatic-frequency control (AFC)
 Bias circuitry for bandgap biasing and circuit shutdown

TH7111