MK3722 Datasheet, PDF (1/7 Pages) Integrated Circuit Systems – VCXO PLUS AUDIO CLOCK FOR STB

VCXO PLUS AUDIO CLOCK FOR STB
DATASHEET
MK3722
Description
The MK3722 is a low cost, low jitter, high performance
VCXO and PLL clock synthesizer designed to replace
expensive discrete VCXOs and multipliers. The patented
on-chip Voltage Controlled Crystal Oscillator accepts a 0 to
3.3 V input voltage to cause the output clocks to vary by
±115 ppm. Using IDT’s analog/digital Phase-Locked Loop
(PLL) techniques, the device uses an inexpensive 27 MHz
pullable crystal input to produce a reference output and a
selectable audio clock.
IDT manufactures the largest variety of VCXO based timing
devices for all applications. Consult IDT to eliminate
VCXOs, crystals, and oscillators from your board.
The frequency of the on-chip VCXO is adjusted by an
external control voltage connected to VIN. Because VIN is
a high impedance input, it can be driven directly from an
PWM RC integrator circuit.
Features
• Packaged in 16-pin TSSOP
• Pb (lead) free package
• Replaces a VCXO and oscillator
• Operating voltage of 3.3V
• Provides output of 27 MHz plus audio clock
• Uses an inexpensive 27 MHz pullable crystal
• On-chip patented VCXO with pull range of 230 ppm
(minimum)
• VCXO tuning voltage of 0 to 3.3 V
• Advanced, low power, sub-micron CMOS process
Block Diagram
S2:S0 ³
VIN
X1
27 MHz
Pullable
Crystal _X2
VDD
3
PLL/Clock
Synthesis
Circuitry
Voltage
Controlled
Crystal
Oscillator
3
GND
PDTS
ACLK
27MHz
IDT™ VCXO PLUS AUDIO CLOCK FOR STB
1
MK3722
REV G 051310