Microchip MICRF505 Handleiding

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MICRF505

850MHz and 950MHz ISM Band

Transceiver

October 20061

M9999-103106

+1 408-944-0800

General Description

The MICRF505 is a true single-chip, frequency shift

keying (FSK) transceiver intended for use in half-

duplex, bidirectional RF links. The multi-channeled

FSK transceiver is intended for UHF radio

equipment in compliance with the North American

Federal Communications Commission (FCC) part

15.247 and the European Telecommunication

Standard Institute (ETSI) specification, EN300 220.

The transmitter consists of a 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 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 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 which 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 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 Micrel’s web site at www.micrel.com.

RadioWire®

Features

•True single chip transceiver

•Digital bit synchronizer

•Received signal strength indicator (RSSI)

•RX and TX power management

• Power down function

•Reference crystal tuning capabilities

•Frequency error estimator

• Baseband shaping

•Three-wire programmable serial interface

•Register read back function

Applications

• Telemetry

• Remote metering

• Wireless controller

•Remote data repeater

•Remote control systems

• Wireless modem

•Wireless security system

Product specificaties