MICRF505 850MHz and 950MHz ISM Band Transceiver General Description RadioWire The MICRF505 is a true single-chip, frequency shift keying (FSK) transceiver intended for use in half- Features duplex, bidirectional RF links. The multi-channeled True single chip transceiver FSK transceiver is intended for UHF radio Digital bit synchronizer equipment in compliance with the North American Federal Communications Commission (FCC) part Received signal strength indicator (RSSI) 15.247 and the European Telecommunication RX and TX power management Standard Institute (ETSI) specification, EN300 220. Power down function The transmitter consists of a PLL frequency Reference crystal tuning capabilities synthesizer and power amplifier. The frequency Frequency error estimator synthesizer consists of a voltage-controlled oscillator (VCO), a crystal oscillator, dual modulus prescaler, Baseband shaping programmable frequency dividers, and a phase- Three-wire programmable serial interface detector. The loop-filter is external for flexibility and Register read back function 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 Applications in lock. In receive mode, the PLL synthesizer Telemetry generates the local oscillator (LO) signal. The N, M, Remote metering and A values that give the LO frequency are stored in the N0, M0, and A0 registers. Wireless controller The receiver is a zero intermediate frequency (IF) Remote data repeater type which makes channel filtering possible with low- Remote control systems power, integrated low-pass filters. The receiver Wireless modem consists of a low noise amplifier (LNA) that drives a Wireless security system quadrature mix 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 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. M9999-103106 October 2006 1 +1 408-944-0800 Micrel MICRF505BML/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 MICRF505........................................................................................................... 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 MICRF505 .................................................................................................... 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 M9999-103106 October 2006 2 +1 408-944-0800