CT266
Universal VCO/Buffer for CT0 Designs
Features
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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
Eight-pin SOIC package
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
Figure 2).
The on-chip highly efficient
buffer amplifier will provide enough power to the 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 the buffer amplifier transmit power cut-off feature
provides design choice to lock detection for monitoring trans-
mitted power at out-of-lock condition of the PLL frequency
synthesizer. This chip is designed at Cypress using special
CMOS processing technology that provides wide working
supply voltage and low current consumption advantages.
Applications
This versatile VCO circuit with buffer chip can be used in
general phase-locked loop (PLL) frequency synthesizer appli-
cations such as: cordless phone, CATV, AM/FM radio, TV
tuning, satellite receiver, and other telecommunication
designs.
Block Diagram
Pin Configuration
8
STP
3
SB
4
VCO Circuit
5
VCOu
1
VD
VD
6
7
VSS
High Efficiency
AMPLIFIER
2
Fout
VDD
Fout
SB
VCOin
1
2
3
4
8
7
6
5
STP
VSS
VDD
VCOut
VCOin
8 - Pin SOIC
Cypress Semiconductor Corporation
Document #: 38-07341 Rev. **
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3901 North First Street
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San Jose
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CA 95134 • 408-943-2600
Revised January 24, 2002
CYPRESS [ CYPRESS SEMICONDUCTOR ]
