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MK2704SLF

P1-P3P4-P6
DATASHEET
PLL AUDIO CLOCK SYNTHESIZER MK2704
IDT™
PLL AUDIO CLOCK SYNTHESIZER 1
MK2704 REV E 051310
Description
The MK2704 is a low cost, low jitter, high-performance PLL
clock synthesizer designed to replace oscillators and PLL
circuits in set-top box and multimedia systems. Using IDT’s
patented analog Phase Locked Loop (PLL) techniques, the
device uses a 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
track perfectly.
IDT manufactures the largest variety of Set-Top Box and
multimedia clock synthesizers for all applications. Consult
IDT to eliminate VCXOs, crystals and oscillators from your
board.
Features
• Packaged in 8-pin SOIC
• Pb-free packaging
• Uses an inexpensive, fundamental crystal or clock
• Selectable audio output clock of 16.9344 MHz, 18.432
MHz, or 36.864 MHz
• Supports MPEG sampling rates of 384x, 44.1 kHz, 48
kHz, and 96 kHz
• Patented zero ppm synthesis error in all clocks
• All frequencies are frequency locked
• 25 mA output drive capability at TTL levels
• Advanced, low power, sub-micron CMOS process
• Operating voltage of 3.3 V or 5 V
Block Diagram
CLK
PLL Clock
Synthesis
and Control
Circuitry
27 MHz
crystal or
clock input
VDD
Crystal
Oscillator
S1:0
X1
X2
27M
GND
2
Capacitors are required for crystal tuning
MK2704
PLL AUDIO CLOCK SYNTHESIZER CLOCK SYNTHESIZER
IDT™
PLL AUDIO CLOCK SYNTHESIZER 2
MK2704 REV E 051310
Pin Assignment
8-pin (150 mil) SOIC
AUDIO CLOCK OUTPUT SELECT TABLE
Key: 0 = Connect pin directly to ground
1 = Connect pin directly to VDD
Pin Descriptions
External Components
Decoupling Capacitor
As with any high performance mixed-signal IC, the MK2704
must be isolated from system power supply noise to perform
optimally.
A decoupling capacitor of 0.01µF must be connected
between VDD and GND on pins 2 and 3. It must be
connected close to the MK2704 to minimize lead
inductance. No external power supply filtering is required for
the MK2704.
Series Termination Resistor
A 33Ω terminating resistor can be used next to the clock
outputs for trace lengths over one inch.
Crystal Load Capacitors
The total on-chip capacitance is approximately 16 pF. A
parallel resonant, fundamental mode, AT cut 27 MHz crystal
should be used. The device crystal connections should
include pads for small capacitors from X1 to ground and
from X2 to ground. These capacitors are used to adjust the
X1
VDD
GND
S0
27M
S1
CLK
X21
2
3
4
8
7
6
5
S1 S0 CLK (MHz)
0 0 36.864
01 Test
1 0 16.9344
1 1 18.432
Pin
Number
Pin
Name
Pin
Type
Pin Description
1 X1 XI Crystal Connection. Connect to a 27 MHz fundamental crystal or clock.
2 VDD Power Connect to +3.3 V or +5 V.
3 GND Power Connect to ground.
4 27M Output 27.00 MHz buffered reference clock output.
5 CLK Output Audio clock output per table above.
6 S1 Input Audio clock frequency select input #1. Determines CLK output per table
above. Internal pull-up resistor.
7 S0 Input Audio clock frequency select input #0. Determines CLK output per table
above. Internal pull-up resistor.
8 X2 XO Crystal connection to a 27 MHz crystal, or leave unconnected for clock
output.
MK2704
PLL AUDIO CLOCK SYNTHESIZER CLOCK SYNTHESIZER
IDT™
PLL AUDIO CLOCK SYNTHESIZER 3
MK2704 REV E 051310
stray capacitance of the board to match the nominally
required crystal load capacitance. Because load
capacitance can only be increased in this trimming process,
it is important to keep stray capacitance to a minimum by
using very short PCB traces (and no vias) between the
crystal and device. Crystal capacitors, if needed, must be
connected from each of the pins X1 and X2 to ground.
The value (in pF) of these crystal caps should equal (C
L
-16
pF)*2. In this equation, C
L
= crystal load capacitance in pF.
Example: For a crystal with an 18 pF load capacitance, each
crystal capacitor would be 4 pF [(18-16) x 2] = 4.
Absolute Maximum Ratings
Stresses above the ratings listed below can cause permanent damage to the MK2704. These ratings, which are
standard values for IDT commercially rated parts, are stress ratings only. Functional operation of the device at these
or any other conditions above those indicated in the operational sections of the specifications is not implied.
Exposure to absolute maximum rating conditions for extended periods can affect product reliability. Electrical
parameters are guaranteed only over the recommended operating temperature range.
Recommended Operation Conditions
DC Electrical Characteristics
VDD=3.3 V ±5% , Ambient temperature 0 to +70° C, unless stated otherwise
Item Rating
Supply Voltage, VDD 7 V
All Inputs and Outputs -0.5 V to VDD+0.5 V
Ambient Operating Temperature 0 to +70° C
Storage Temperature -65 to +150° C
Soldering Temperature 260° C
Parameter Min. Typ. Max. Units
Ambient Operating Temperature 0 +70 ° C
Power Supply Voltage (measured in respect to GND) +3.13 +5.50 V
Parameter Symbol Conditions Min. Typ. Max. Units
Operating Voltage VDD 3.13 5.50 V
Input High Voltage V
IH
X1 pin only
Note 1
(VDD/2)+1 VDD/2 V
Input Low Voltage V
IL
X1 pin only
Note 1
VDD/2 (VDD/2)-1 V
Input High Voltage V
IH
S0, S1 pins 2.0 V
Input Low Voltage V
IL
S0, S1 pins 0.8 V
Output High Voltage V
OH
I
OH
= -12 mA 2.4 V
Output Low Voltage V
OL
I
OL
= 12 mA 0.4 V
P1-P3P4-P6

MK2704SLF

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