CMX017
UHF FM/FSK
Transmitter
D/017/3 April 1999
Advance Information
Features
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Applications
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Direct FM/FSK UHF Modulator
Adjustable Modulator Output Power
Integrated Power Amplifier with Output
Power up to +20dBm (100mW)
Low Power 2.7V Operation
Powersave and Zero-Power (<10
µ
A) Modes
28-Pin SSOP Package
General Radio Link 860-965 MHz
General 915MHz ISM Band (USA)
Spread Spectrum Wireless Systems
Fixed Frequency Transmissions
Analogue/Digital Cordless Phones
Handheld Data Terminals
So-Ho Wireless Data Links
GAIN
MODOUT
PAIN
IPAOUT
FM/FSK
MODULATOR
POWER
AMPLIFIER
DRIVER
POWER
AMPLIFIER
PAOUT
MODIN
TANK
BUFFERED
OSCILLATOR
OUTPUT
BANDGAP & BIAS
CONTROL
OSCOUT
ENLMOD
ENLPA
1.1
Brief Description
The CMX017 is a single chip UHF FM/FSK transmitter that combines both the RF VCO Modulator and
RF Power Amplifier. It is suitable for both audio FM and digital FSK transmissions.
A buffered oscillator output provides the RF signal drive to an external synthesizer or fixed frequency
phase-locked loop for channel frequency selection. Modulator output power is adjustable over a 20dB
range and the integrated power amplifier delivers up to +20dBm. The device also includes a powersave
mode: “Transmit Standby” and a zero-power mode: “Sleep”. These allow independent power down
control of both the modulator and power amplifier, thereby maximising battery life. The device can be
used in conjunction with the CMX018, a double-conversion super-heterodyne receiver, to implement a
complete UHF radio link.
©
1999
Consumer Microcircuits Limited
CMLMICRO [ CML MICROCIRCUITS ]
