replace oscillators and PLL circuits in set-top box
and multimedia systems. Using our patented
analog Phase-Locked Loop (PLL) techniques, the
device uses a fundamental 27 MHz crystal or clock
input to produce a buffered reference clock and a
selectable audio clock. The audio clock is
frequency locked to the 27 MHz clock, assuring
that the audio with zero ppm error and video will
always track perfectly.
MK2704
PLL Audio Clock Synthesizer
Features
• Packaged in 8 pin SOIC
• Uses an inexpensive fundamental crystal, or clock
• Output clocks of 16.9344 MHz, 18.432 MHz,
and 36.864 MHz
• Supports 384x MPEG sampling rates of 44.1 kHz,
48 kHz and 96 kHz
• Patented zero ppm synthesis error in all clocks
• All frequencies are frequency locked
• Advanced, low power, sub-micron CMOS process
• 3.3 V or 5 V operating voltage
Block Diagram
VDD
GND
S1:0
2
PLL
Clock
Synthesis
and
Control
Circuitry
Crystal
Oscillator
Output
Buffer
CLK
27 MHz
crystal or
clock
X1
Output
Buffer
27.000 MHz
X2
(Capacitors are required for crystal tuning)
MDS 2704 A
1
Revision 062700
Integrated Circuit Systems, Inc. • 525 Race Street • San Jose •CA•95126•(408) 295-9800tel • www.icst.com
PRELIMINARY INFORMATION
I C R O
C
LOC K
Pin Assignment
MK2704
PLL Audio Clock Synthesizer
Audio Clock Output Select Table (MHz)
S1
0
0
1
1
Key:
S0
0
1
0
1
CLK
36.864
Test
16.9344
18.432
MK2704
X1
VDD
GND
27M
1
2
3
4
8
7
6
5
X2
S0
S1
CLK
0 = connect pin directly to ground
1 = connect pin directly to VDD
8 pin SOIC
Pin Descriptions
Number
1
2
3
4
5
6
7
8
Name
X1
VDD
GND
27M
CLK
S1
S0
X2
Type
XI
P
P
O
O
I(PU)
I(PU)
XO
Description
Crystal Connection. Connect to a 27.0 MHz fundamental crystal or clock.
Connect to +3.3V or +5V.
Connect to ground.
27.00 MHz buffered reference clock output.
Audio Clock Output per table above.
Audio Clock Frequency Select Input #1. Determines CLK output per table above.
Audio Clock Frequency Select Input #0. Determines CLK output per table above.
Crystal Connection to a 27.0 MHz crystal, or leave unconnected for clock input.
Key: XI, XO = Crystal connections; I(PU) = Input with internal pull-up resistor; O = output;
P = power supply connection
MDS 2704 A
2
Revision 062700
Integrated Circuit Systems, Inc. • 525 Race Street • San Jose •CA•95126•(408) 295-9800tel • www.icst.com
PRELIMINARY INFORMATION
I C R O
C
LOC K
Electrical Specifications
Parameter
Supply voltage, VDD
Inputs and Clock Outputs
Ambient Operating Temperature
Soldering Temperature
Storage temperature
Operating Voltage, VDD
Input High Voltage, VIH, X1 pin only
Input Low Voltage, VIL, X1 pin only
Input High Voltage, VIH
Input Low Voltage, VIL
Output High Voltage, VOH
Output Low Voltage, VOL
Output High Voltage, VOH, CMOS level
Operating Supply Current, IDD
Short Circuit Current
Input Capacitance
Frequency synthesis error
Input Crystal Frequency
Input Crystal Accuracy
Output Clock Rise Time
Output Clock Fall Time
Output Clock Duty Cycle
Maximum Absolute Jitter, short term
Notes:
Conditions
MK2704
PLL Audio Clock Synthesizer
Minimum
Typical
Maximum
7
VDD+0.5
70
260
150
5.50
(VDD/2)-1
2
0.8
Units
V
V
°C
°C
°C
V
V
V
V
V
V
V
V
mA
mA
pF
ppm
MHz
ppm
ns
ns
%
ps
ABSOLUTE MAXIMUM RATINGS (note 1)
Referenced to GND
Referenced to GND
MK2704S
Max of 10 seconds
-0.5
0
-65
3.13
(VDD/2)+1
DC CHARACTERISTICS (VDD = 3.3V unless noted)
Note 2
Note 2
IOH=-12mA
IOL=12mA
IOH=-4mA
No Load
Each output
S1, S0
All clocks
2.4
0.4
VDD-0.4
10
±50
5
0
27.00
AC CHARACTERISTICS (VDD = 3.3V unless noted)
±30
1.5
1.5
60
±190
0.8 to 2.0V
2.0 to 0.8V
At 1.4V
40
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. CMOS level input. Nominal trip point is VDD/2 for 3.3 V or 5 V operation.
External Components
The MK2704 requires a minimum number of external components for proper operation. For a crystal input,
one load capacitor should be connected from each of the X1 and X2 pins to ground. The value (in pF) of
each crystal load capacitor should equal (CL -16)•2, where CL is the crystal’s load (correlation) capacitance
in pF. The input crystal must be connected as close to the chip as possible. The input crystal should be a
parallel resonant, fundamental, AT cut 27 MHz. For a clock input, connect to X1 and leave X2
unconnected. Decoupling capacitors of 0.01µF should be connected between VDD and GND on pins 2
and 3, as close to the MK2704 as possible. A series termination resistor of 33
Ω
may be used for the clock
output.
MDS 2704 A
3
Revision 062700
Integrated Circuit Systems, Inc. • 525 Race Street • San Jose •CA•95126•(408) 295-9800tel • www.icst.com
PRELIMINARY INFORMATION
I C R O
C
LOC K
MK2704
PLL Audio Clock Synthesizer
Package Outline and Package Dimensions
(
For current dimensional specifications, see JEDEC Publication No. 95.)
8 pin SOIC
Symbol
A
A1
E
INDEX
AREA
H
B
C
1
2
D
A1
e
C
h x 45°
D
E
e
H
h
L
Inches
Min
Max
0.0532 0.0688
0.0040 0.0098
0.0130 0.0200
0.0075 0.0098
0.1890 0.1968
0.1497 0.1574
.050 BSC
0.2284 0.2440
0.0099 0.0195
0.0160 0.0500
Millimeters
Min
Max
1.35
1.75
0.10
0.24
0.33
0.51
0.19
0.24
4.80
5.00
3.80
4.00
1.27 BSC
5.80
6.20
0.25
0.50
0.41
1.27
A
L
B
Ordering Information
Part/Order Number
MK2704S
MK2704STR
Marking
MK2704S
MK2704S
Shipping packaging
tubes
tape and reel
Package
8 pin SOIC
8 pin SOIC
Temperature
0 to 70 °C
0 to 70 °C
While the information presented herein has been checked for both accuracy and reliability, Integrated Circuit Systems, Inc. (ICS) 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 2704 A
4
Revision 062700
Integrated Circuit Systems, Inc. • 525 Race Street • San Jose •CA•95126•(408) 295-9800tel • www.icst.com
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