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MK3724

VCXO PLUS AUDIO CLOCK FOR STB

Integrated Circuit Systems 

MK3724

VCXO PLUS AUDIO CLOCK FOR STB

Description

The MK3724 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 ICS’ 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.

ICS manufactures the largest variety of VCXO based

timing devices for all applications. Consult ICS 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

• Available in Pb free packaging

• Replaces a VCXO and oscillator

• Operating voltage of 3.3 V

• 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

• Industrial temperature range available

• For other standard audio frequencies see the

MK3722

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

MDS 3724 C

1

Revision 121904

Integrated Circuit Systems ● 525 Race Street, San Jose, CA 95126 ● tel (408) 297-1201 ● www.icst.com

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