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PRELIMINARY INFORMATION
ICS3727XP
LOW COST 24 TO 36 MHZ 3.3 VOLT VCXO
Description
The ICS3727XP c...
www.DataSheet4U.com
PRELIMINARY INFORMATION
ICS3727XP
LOW COST 24 TO 36 MHZ 3.3 VOLT VCXO
Description
The ICS3727XP combines the functions of a VCXO (
Voltage Controlled Crystal Oscillator) and PLL (Phase-Locked Loop) frequency doubler onto a single chip. It is designed primarily for data and clock recovery applications within end products such as set-top box receivers. The ICS3727XP exhibits a moderate VCXO gain of 200 ppm/V typical, when used with a high quality external pullable quartz crystal. The frequency of the on-chip VCXO is adjusted by an external control
voltage input into pin VIN. Because VIN is a high impedance input, it can be driven directly from an PWM RC integrator circuit. Frequency output increases with VIN
voltage input. The usable range of VIN is 0 to 3.3 V.
Features
ICS3727XP offers 24 to 36 MHz output frequency
range (output frequency = 2x crystal frequency) and improved power supply noise rejection
Uses an inexpensive 12 to 18 MHz external crystal Ideal for DV CODEC applications using 27 MHz
external pullable crystal with extended pull range to generate locked 27 MHz clock transport video clock
On-chip VCXO with guaranteed pull range of ±200
ppm minimum
VCXO input tuning
voltage 0 to 3.3 V Packaged in 8-pin SOIC (150 mil wide)
Block Diagram
VIN
12-18 MHz Pullable Crystal
X1
X2
Voltage Controlled Crystal Oscillator
PLL Frequency Doubler
24-36 MHz (2x Crystal Frequency)
MDS 3727XP A I n t e gra te d C i r c u i t S y s t e m s
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