The MICRF506 is a single chip, frequency shift keying (FSK) transceiver intended for use in half-duplex, bidirectional RF links. This multichanneled FSK transceiver from Micrel is intended for UHF radio equipment in compliance with the FCC part 15.247 and 249, as well as ETSI specification, EN300 220.
The transmitter consists of a PLL frequency synthesiser and a power amplifier. The frequency synthesiser consists of a VCO, a crystal oscillator, dual modulus prescaler, programmable frequency dividers, and a phase-detector. The loop-filter is external for flexibility and can be a simple passive circuit. The output power of the power amplifier can be programmed to seven levels. A lock-detect circuit detects when the PLL is in lock. In receive mode, the PLL synthesiser generates the local oscillator (LO) signal.
The receiver is a zero IF type that makes channel filtering possible with low-power, integrated low-pass filters. The receiver consists of a low noise amplifier (LNA) that drives a quadrature mixer pair. The mixer outputs feed two identical signal channels in phase quadrature. Each channel includes a pre-amplifier, a third order Sallen-Key RC low-pass filter that protects the following switched-capacitor filter from strong adjacent channel signals, and a limiter.
The main channel filter is a switched-capacitor implementation of a six-pole elliptic low-pass filter. The cut-off frequency of the RC filter can be programmed to four different frequencies: 100, 150, 230 and 340 kHz. The I and Q channel outputs are demodulated and produce a digital data output.
If the phase of the I channel signal lags behind the Q channel, the FSK tone frequency is above the LO frequency (data '1' is output). If it leads the Q channel, the FSK tone is below the LO frequency (data '0' is output). A receive signal strength indicator indicates the received signal level.
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