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MICRF600 Datasheet, PDF (1/19 Pages) Micrel Semiconductor – 902-928MHz ISM Band Transceiver Module | |||
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MICRF600
902-928MHz ISM Band Transceiver
Module
General Description
The MICRF600 is a self-contained frequency shift keying (FSK)
transceiver module, intended for use in half-duplex, bidirectional
RF links. The multi-channeled FSK transceiver module is intended
for UHF radio equipment in compliance with the North American
Federal Communications Commission (FCC) part 15.247 and
249.
The transmitter consists of a fully programmable PLL frequency
synthesizer and power amplifier. The frequency synthesizer
consists of a voltage-controlled oscillator (VCO), a crystal
oscillator, dual modulus prescaler, programmable frequency
dividers, and a phase-detector. 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 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.
The receiver is a zero intermediate frequency (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 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 350kHz. 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 â1â). If the I channel
leads the Q channel, then the FSK tone is below the LO
frequency (data â0â). 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 Micrelâs web site at: www.micrel.com.
Features
RadioWire® Module
⢠âDrop inâ RF solution
⢠Small size: 11.5x14.1mm
⢠RF tested
⢠FCC Compliant
⢠Low Power
⢠Surface Mountable
⢠Tape & Reel
⢠Digital Bit Synchronizer
⢠Received Signal Strength Indicator (RSSI)
⢠RX and TX power management
⢠Power down function
⢠Register read back function
Applications
⢠Telemetry
⢠Remote metering
⢠Wireless controller
⢠Remote data repeater
⢠Remote control systems
⢠Wireless modem
⢠Wireless security system
RadioWire® is a trademark of Micrel, Inc
Power, Connect and Protect is a registered trademark of Micrel, Inc.
Micrel Inc. ⢠2180 Fortune Drive ⢠San Jose, CA 95131 ⢠USA ⢠tel +1 (408) 944-0800 ⢠fax + 1 (408) 474-1000 ⢠http://www.micrel.com
September 2005
M9999-091905
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