MK2772-01
VCXO and Set-Top Clock Source
Description
The MK2772-01 is a low cost, low jitter, high
performance VCXO and clock synthesizer 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’
patented VCXO and analog Phase-Locked Loop (PLL)
techniques, the device uses an inexpensive 13.5 MHz
crystal input to produce multiple output clocks. All
clocks are frequency locked to the 27.00MHz output
(and to each other) with zero ppm error. The MK2772
includes a glitch-free multiplexer to switch input
sources during operation.
ICS manufactures the largest variety of Set-Top Box
and multimedia clock synthesizers for all applications.
Consult ICS to eliminate VCXOs, crystals and
oscillators from your board.
Features
• Packaged in 20 pin SOIC (Pb free available)
• Uses an inexpensive 13.5 MHz crystal
• On-chip VCXO (patented) with pull range
of 200ppm (minimum)
• Ability to switch input sources “on-the-fly”
• VCXO tuning voltage of 0 to 3V
• Zero ppm synthesis error (patented) in all
clocks. All exactly track 27MHz VCXO
• All clocks are frequency locked. All will vary the
same amount (in ppm) as the VCXO
• Selectable Audio clock for 256x, 384x, and 512x.
• 25mA output drive capability at TTL levels
• Advanced, low power, sub-micron CMOS process
• 5V operating voltage
Block Diagram
VDD
GND
3
3
Output
Buffer
Output
Buffer
Output
Buffer
Output
Buffer
ACS1:0
2
Audio Clock
INMUXSEL
EXTCLKIN
VIN
X1
Voltage Controlled
Crystal Oscillator
and x2 PLL
Clock
Synthesis
Circuitry
16.6667 MHz
11.0592 MHz
3.6864 MHz
3
13.5 MHz
pullable
crystal
X2
deglitched
mux
Output
Buffers
27.000 MHz
MDS 2772-01 D
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Revision 102704
MK2772-01
VCXO and Set-Top Clock Source
Pin Assignment
ACS1
X2
X1
VDD
VIN
VDD
GND
16.67M
3.68M
ACLK
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
ACS0
EXTCLKIN
27M
GND
27M
VDD
GND
27M
11.06M
INMUXSEL
Audio Clock Select
ACS1 ACS0 ACLK (MHz)
0
0
8.192
0
M
16.384
0
1
11.2896
M
0
16.9344
M
M
22.5792
M
1
18.432
1
0
12.288
1
M
24.576
1
1
5.6448
Input Source Select
INMUXSEL
0
1
27 MHz Input
EXTCLKIN
Internal VCXO
Pin Descriptions
Number
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
Name
ACS1
X2
X1
VDD
VIN
VDD
GND
16.67M
3.68M
ACLK
INMUXSEL
11.06M
27M
GND
VDD
27M
GND
27M
EXTCLKIN
ACS0
Type Description
TI
X
X
P
VI
P
P
O
O
O
I
O
O
P
P
O
P
O
I
TI
Audio Clock Select 1. Determines ACLK frequency, as per table above.
Crystal connection. Connect to a pullable 13.5 MHz crystal.
Crystal connection. Connect to a pullable 13.5 MHz crystal.
Connect to +5V, and other VDDs.
Voltage Input to VCXO. Zero to 3V signal which controls the frequency of the VCXO.
Connect to +5V.
Connect to ground.
16.6667 MHz processor clock output.
3.6864 MHz clock output.
Audio Clock Output determined by ACS1,0. Per table above.
Input Multiplexer Select. Selects either the internal VCXO/PLL output, or the clock on pin 19.
11.0592 MHz clock output.
27.00 MHz clock output.
Connect to ground.
Connect to +5V.
27.00 MHz clock output.
Connect to ground.
27.00 MHz clock output.
External Clock Input. Connect an external 27 MHz clock to this pin for glitch free switching.
Audio Clock Select 0. Determines ACLK frequency, as per table above.
Key: I = Input, TI = tri-level input, VI = VCXO input, O = output, P = power supply connection, X = crystal connection
MDS 2772-01 D
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Revision 102704
MK2772-01
VCXO and Set-Top Clock Source
Electrical Specifications
Parameter
Conditions
Minimum Typical Maximum Units
ABSOLUTE MAXIMUM RATINGS (note 1)
Supply voltage, VDD
Referenced to GND
7
V
Inputs and Clock Outputs
Referenced to GND
-0.5
VDD+0.5
V
Ambient Operating Temperature
0
70
°C
Soldering Temperature
Max of 10 seconds
260
°C
Storage temperature
-65
150
°C
DC CHARACTERISTICS (VDD = 5.0V unless noted)
Operating Voltage, VDD
4.75
5.25
V
Input High Voltage, VIH, X1 pin only
3.5
2.5
V
Input Low Voltage, VIL, X1 pin only
2.5
1.5
V
Input High Voltage, VIH
ACS1, ACS0
VDD-0.5
V
Input High Voltage, VIH
INMUXSEL
2
V
Input Low Voltage, VIL
0.8
V
Output High Voltage, VOH
IOH=-25mA
2.4
V
Output Low Voltage, VOL
IOL=25mA
0.4
V
Output High Voltage, VOH, CMOS level
IOH=-8mA
VDD-0.4
V
Operating Supply Current, IDD
No Load, note 2
45
mA
Pull-up Resistor value
pin 11 only
250k
Ω
Input Capacitance
7
pF
Frequency synthesis error
All clocks as shown
0
1
ppm
VIN, VCXO control voltage
0
3
V
AC CHARACTERISTICS (VDD = 5.0V unless noted)
Input Crystal Frequency
13.50000
MHz
Input Crystal Accuracy
±30
ppm
Output Clock Rise Time
0.8 to 2.0V
1.5
ns
Output Clock Fall Time
2.0 to 0.8V
1.5
ns
Output Clock Duty Cycle
At 1.4V
40
60
%
Maximum Absolute Jitter, short term
300
ps
27 MHz output pullability, note 3
0V < VIN < 3V'
±100
ppm
Notes: 1. Stresses beyond those listed under Absolute Maximum Ratings could cause permanent damage to the
device. Prolonged exposure to levels above the operating limits but below the Absolute Maximums may affect
device reliability.
2. With ACLK at 12.288 MHz.
3. With a recommended crystal.
External Components/Crystal Selection
The MK2772-01 requires a minimum number of external components for proper operation. Decoupling capacitors
of 0.1µF should be connected between VDD (pin 15) and GND (14), and between VDD (4) and GND (7), as close to
the MK2772-01 as possible. A series termination resistor of 33Ω may be used for each clock output. The input
crystal must be connected as close to the chip as possible.
For the VCXO to operate correctly, a crystal properly specified and matched to the MK2772-01 must be used. For
more information, including a list of recommended crystals, refer to application note MAN05.
MDS 2772-01 D
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Revision 102704
MK2772-01
VCXO and Set-Top Clock Source
Package Outline and Package Dimensions
20 pin SOIC
Inches
Symbol
A
b
c
D
E
H
e
h
Min
0.092
0.014
0.009
0.490
0.290
0.394
Max
0.104
0.019
0.012
0.512
0.300
0.419
0.016
0.003
0.011
0.076
Millimeters
Min
2.3368
0.356
0.229
12.446
7.366
10.008
Max
2.6416
0.483
0.305
13.005
7.620
10.643
0.406
0.279
E
H
.050 BSC
1.27 BSC
h x 45°
D
Q
Q
e
b
c
A
Ordering Information
Part/Order Number
MK2772-01S
MK2772-01STR
MK2772-01SLF
Marking
MK2772-01S
MK2772-01S
MK2772-01SLF
Shipping packaging
tubes
tape and reel
tubes
tape and reel
Package
20 pin SOIC
20 pin SOIC
20 pin SOIC
20 pin SOIC
Temperature
0-70°C
0-70°C
0-70°C
0-70°C
MK2772-01SLFTR
MK2772-01SLF
While the information presented herein has been checked for both accuracy and reliability, ICS Incorporated assumes no
responsibility for either its use or for the infringement of any patents or other rights of third parties, which would result from its
use. No other circuits, patents, or licenses are implied. This product is intended for use in normal commercial applications. Any
other applications such as those requiring extended temperature range, high reliability, or other extraordinary environmental
requirements are not recommended without additional processing by ICS. ICS reserves the right to change any circuitry or
specifications without notice. ICS does not authorize or warrant any ICS product for use in life support devices or critical
medical instruments.
MDS 2772-01 D
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Revision 102704
Integrated Circuit Systems, Inc. • 525 Race Street • San Jose • CA • 95126 • (408)295-9800tel • www.icst.com
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