MK2771-13 Ver la hoja de datos (PDF) - Integrated Circuit Systems
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MK2771-13 Datasheet PDF : 4 Pages
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MK2771-13
VCXO and Set-Top Clock Source
Description
The MK2771-03 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 ICS/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, a selectable audio clock, a fixed 33.33 MHz
or 24.576 MHz, two low skew copies of the
27MHz, and a fixed 13.5 MHz. All clocks are
frequency locked to the 27.00MHz output (and to
each other) with zero ppm error, so any output can
be used as the VCXO output.
This chip directly replaces the MK2771-03 when a
13.5 MHz input crystal is substituted for the
14.31818 MHz used on the -03. Additionally, the
-13 adds 25 MHz to the processor clock selection,
and 24.576 MHz on the BCLK.
Features
• Packaged in 20 pin SOIC
• Pin for pin and functional upgrade to MK2771-03
• Ideal for systems using Oak’s MPEG decoders
• On-chip patented VCXO with pull range
of 200ppm
• VCXO tuning voltage of 0 to 3V
• Processor frequency of 16.67 MHz, 20 MHz,
25 MHz, 32 MHz, 40 MHz, or 50 MHz
• Audio clocks of 8.192, 11.2896, and 12.288 MHz
• Zero ppm synthesis error in all clocks (all exactly
track 27MHz VCXO) - patented
• Uses an inexpensive 13.5 MHz crystal
• 25mA output drive capability at TTL levels
• Advanced, low power, sub-micron CMOS process
• 5V operating voltage
Block Diagram
VDD GND
33
PCS1:0
2
Output
Buffer
Processor Clock
ACS1:0
2
BCS
VIN
13.5 MHz X1
Voltage
pullable
Controlled
crystal
Crystal
X2 Oscillator
Clock
Synthesis
Circuitry
÷2
Output
Buffer
Audio Clock
Output
Buffer
Output
Buffers
Output
Buffer
33.3 MHz or
24.576 MHz
2
27.000 MHz
13.500 MHz
MDS 2771-13 A
1
Revision 110298
Printed 11/16/00
Integrated Circuit Systems • 525 Race Street•San Jose•CA•95126•(408)295-9800tel•www.icst.com
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