RFB915B

Part No.:
RFB915B
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Download
Description:
434MHz ISM Band Transceiver Module
File Size:
257 K
Page:
18 Pages
Logo:
Maker:
MICREL [ MICREL SEMICONDUCTOR ]
PCB Prototype

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PCB Datasheet:1PCB Datasheet:1PCB Datasheet:1
MICRF620
434MHz ISM Band Transceiver Module
General Description
The MICRF620 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 European Telecommunication
Standard Institute (ETSI) specification, EN300 220.
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 “1”). If the I channel leads the Q
channel, then 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 Micrel’s web site at:
www.micrel.com.
RadioWire
®
Module
Features
“Drop in” RF solution
Small size: 11.5x14.1mm
RF tested
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.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (
408
) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
December 2005
M9999-120205