CT266
Universal VCO/Buffer for CT0 Designs
Approved Product
Features
Applications
This versatile VCO circuit with buffer chip can be used
in general PLL frequency synthesizer applications such
as: Cordless phone, CATV, AM/FM Radio, TV tuning,
Satellite Receiver, and other telecommunication
designs.
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Wide range VCO (>70 MHz) for all CT0 designs
Highly efficient on-chip buffer amplifier
Real standby VCO with zero chip current
consumption
Transmit power cut-off for out-of-lock condition
2.0V to 5V working voltage supply
Low current consumption
Excellent frequency stability vs. VDD.
8 pin narrow SOIC package
Product Description
The IMICT266 is extremely versatile for worldwide CT-0 cordless phone applications in matching all present associated
PLL frequency synthesizer product designs. The VCO circuit provides a very easy way to build the particular high quality
VCO (see application Figure 2). The on-chip highly efficient buffer amplifier will provide enough power to antenna or final
power amplifier. This output is normally connected with a fixed low pass filter to remove unwanted harmonics. The
VCO stand-by function stops all power consumption of the chip and buffer amplifier transmit power cut-off feature
provides design choice to lock detection for monitoring transmitted power at out-of-lock condition of phase-locked loop
(PLL) frequency synthesizer. This chip is designed at IMI using special CMOS processing technology that provides wide
working supply voltage and low current consumption advantages.
International Microcircuits,Inc.
525 Los Coches St., Milpitas, 95035 408-263-6300, FAX 408-263-6571
http:/www.imicorp.com
5/17/2000
Rev. 2.0
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