MK2771-12S Integrated Circuit Systems, MK2771-12S Datasheet

MK2771-12S

Manufacturer Part Number

MK2771-12S

Description

VCXO and Set-Top Clock Source

Manufacturer

Integrated Circuit Systems

Datasheet

1.MK2771-12S.pdf (4 pages)

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MDS 2771-12 A

MicroClock Division of ICS • 525 Race Street • San Jose • CA • 95126•(408)295-9800tel•(408)295-9818fax

Description

The MK2771-12 is a low cost, low jitter, high

performance VCXO and clock synthesizer

designed for set-top boxes. The on-chip Voltage

Controlled Crystal Oscillator accepts a 0 to 3V

input voltage to cause the output clocks to vary by

±100 ppm. Using MicroClock’s patented VCXO

and analog Phase-Locked Loop (PLL) techniques,

the device uses an inexpensive 13.5 MHz crystal

input to produce multiple output clocks including

a selectable processor clock, selectable UART and

audio clocks, a fixed 11.0592 MHz, and two low

skew copies of the 27 MHz. All clocks are

frequency locked to the 27.00 MHz output (and

to each other) with zero ppm error, so any output

can be used as the VCXO output.

This chip directly replaces the MK2771-02 when a

13.5 MHz input crystal is substituted for the

14.31818 MHz used on the -02. Additionally, the

-12 adds 24.576 MHz to the ACLK.

Block Diagram

13.5 MHz

pullable

crystal

PCS1:0

UCS

ACS

VIN

I C R O

Controlled

Oscillator

Voltage

Crystal

AVDD

LOC K

VDD

Synthesis

Circuitry

GND

Clock

VCXO and Set-Top Clock Source

• Packaged in 20 pin SOIC

• Pin for pin and functional upgrade to MK2771-02

• Uses an inexpensive 13.5 MHz crystal

• On-chip patented VCXO with pull range

• VCXO tuning voltage of 0 to 3 V

• Processor frequency of 16.67 MHz, 20 MHz,

• Zero ppm synthesis error in all clocks (all exactly

• 25 mA output drive capability at TTL levels

• Advanced, low power, sub-micron CMOS process

• 5 V operating voltage

Features

of 200 ppm

32 MHz, 40 MHz, or 50 MHz

track 27MHz VCXO) - patented

÷ 2

Output

Buffer

Buffers

Buffer

Revision 061699

11.0592 MHz

Processor Clock

49.152 MHz

or 24.576 MHz

3.6864 MHz

or 18.432 MHz

27.000 MHz

13.500 MHz

MK2771-12

Printed 11/16/00

Related parts for MK2771-12S

MK2771-12S Summary of contents

Page 1

... Description The MK2771- low cost, low jitter, high performance VCXO and clock synthesizer designed for set-top boxes. The on-chip Voltage Controlled Crystal Oscillator accepts input voltage to cause the output clocks to vary by ±100 ppm. Using MicroClock’s patented VCXO and analog Phase-Locked Loop (PLL) techniques, the device uses an inexpensive 13 ...

Page 2

... MHz clock output. Connect to ground. Connect to +5V. 27.00 MHz VCXO clock output. Connect to ground. 27.00 MHz VCXO clock output. UART Clock Select. Selects UCLK on pin 9. See table above. ACLK Select. Selects ACLK on pin 10. See table above. 2 MK2771-12 PCS0 PCLK (MHz 50.000 0 1 16.667 ...

Page 3

... With a pullable crystal that conforms to ICS’ specifications. External Components The MK2771-12 requires a minimum number of external components for proper operation. Decoupling capacitors of 0.01µF should be connected between each VDD and GND, and betweeen AVDD and GND, as close to the MK2771-12 as possible. A series termination resistor of 33 output ...

Page 4

... MicroClock Division of ICS • 525 Race Street • San Jose • CA • 95126•(408)295-9800tel•(408)295-9818fax C LOC K VCXO and Set-Top Clock Source 45° c Marking Shipping packaging MK2771-12S tubes MK2771-12S tape and reel 4 MK2771-12 20 pin SOIC Inches Inches Symbol Min Max Min A ...

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