MICRF506 410MHz and 450MHz ISM Band Transceiver General Description RadioWire The MICRF506 is a true single-chip, frequency shift keying (FSK) transceiver intended for use in half-duplex, Features bidirectional RF links. The multi-channeled FSK transceiver True single chip transceiver is intended for UHF radio equipment in compliance with the European Telecommunication Standard Institute (ETSI) Digital bit synchronizer specification, EN300 220. Received signal strength indicator (RSSI) The transmitter consists of a PLL frequency synthesizer RX and TX power management and power amplifier. The frequency synthesizer consists of Power down function a voltage-controlled oscillator (VCO), a crystal oscillator, Reference crystal tuning capabilities dual modulus prescaler, programmable frequency dividers, Frequency error estimator and a phase-detector. The loop-filter is external for flexibility and can be a simple passive circuit. The output power of Baseband shaping the power amplifier can be programmed to seven levels. A Three-wire programmable serial interface lock-detect circuit detects when the PLL is in lock. In Register read back function receive mode, the PLL synthesizer generates the local oscillator (LO) signal. The N, M, and A values that give the LO frequency are stored in the N0, M0, and A0 registers. Applications The receiver is a zero intermediate frequency (IF) type Telemetry which makes channel filtering possible with low-power, Remote metering integrated low-pass filters. The receiver consists of a low Wireless controller noise amplifier (LNA) that drives a quadrature mix pair. The mixer outputs feed two identical signal channels in phase Remote data repeater quadrature. Each channel includes a pre-amplifier, a third Remote control systems order Sallen-Key RC low-pass filter that protects the Wireless modem following switched-capacitor filter from strong adjacent Wireless security system 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 Sallen-Key RC filter can be programmed to four different frequencies: 100kHz, 150kHz, 230kHz, and 340kHz. The I and Q channel outputs are demodulated and produce a digital data output. The demodulator detects the relative phase of the I and the Q channel signal. If the I channel signal lags behind the Q channel, the FSK tone frequency is above the LO frequency (data 1 ). If the I channel leads the Q channel, the FSK tone is below the LO frequency (data 0 ). The output of the receiver is available on the DataIXO pin. A receive signal strength indicator (RSSI) circuit indicates the received signal level. All support documentation can be found on Micrels web site at www.micrel.com. M9999-092904 July 2006 1 +1 408-944-0800 Micrel MICRF506BML/YML General Description....................................................................................................................................................1 Features......................................................................................................................................................................1 Applications ................................................................................................................................................................1 RadioWire RF Selection Guide................................................................................................................................4 Ordering Information...................................................................................................................................................4 Block Diagram ............................................................................................................................................................4 Pin Configuration ........................................................................................................................................................5 Pin Description............................................................................................................................................................5 (1) Absolute Maximum Ratings .....................................................................................................................................6 (2) Operating Ratings ....................................................................................................................................................6 (4) Electrical Characteristics .........................................................................................................................................6 Programming ..............................................................................................................................................................9 Writing to the control registers in MICRF506 ...........................................................................................................10 Writing to a Single Register ......................................................................................................................................10 Writing to All Registers .............................................................................................................................................11 Writing to n Registers having Incremental Addresses..............................................................................................11 Writing to n Registers having Non-Incremental Addresses......................................................................................12 Reading from the control registers in MICRF506 .....................................................................................................12 Programming interface timing...................................................................................................................................12 Power on Reset ........................................................................................................................................................13 Programming summary ............................................................................................................................................14 Frequency Synthesizer.............................................................................................................................................15 Crystal Oscillator (XCO)........................................................................................................................................16 VCO ......................................................................................................................................................................17 Charge Pump........................................................................................................................................................18 PLL Filter...............................................................................................................................................................18 Lock Detect ...........................................................................................................................................................18 Modes of Operation ..............................................................................................................................................18 Transceiver Sync/Non-Synchronous Mode..............................................................................................................19 Data Interface ...........................................................................................................................................................19 Receiver....................................................................................................................................................................20 Front End ..............................................................................................................................................................20 Sallen-Key Filters..................................................................................................................................................20 Switched Capacitor Filter......................................................................................................................................21 RSSI......................................................................................................................................................................21 FEE .......................................................................................................................................................................22 Bit Synchronizer....................................................................................................................................................23 Transmitter................................................................................................................................................................24 Power Amplifier.....................................................................................................................................................24 Modulator ..............................................................................................................................................................26 Using the XCO-tune Bits ..........................................................................................................................................28 Typical Application....................................................................................................................................................30 M9999-092904 July 2006 2 +1 408-944-0800