ICST MK3713S, MK3713STR Datasheet
PRELIMINARY INFORMATION
Low Cost 3.3 Volt VCXO
MK3713
Description
The MK3713 is ICS/MicroClock’s lowest cost,
low jitter, high performance 3.3 Volt VCXO
designed to replace expensive VCXO modules.
The on-chip Voltage Controlled Crystal Oscillator
accepts a 0 to 3.3 V 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 external pullable crystal input
to produce the output clock.
ICS/MicroClock manufactures the largest variety
of communications, set-top box, and multimedia
clock synthesizers for all applications. If more
clock outputs are needed, see the MK3732 or
MK377x family of parts. Consult
ICS/MicroClock to eliminate VCXOs, crystals
and oscillators from your board.
Features
• Packaged in 8 pin SOIC
• Ideal for T1 and E1 VCXOs
• Output range of 1.25 MHz to 10 MHz
• For a 10-20 MHz output range, use the MK3711
• For higher than 20 MHz, use the MK3732-05
• 3.3 V only operating voltage
• Uses an inexpensive 10 - 20 MHz external crystal
• On-chip VCXO (patented) with pull range of
200ppm (minimum)
• VCXO tuning voltage of 0 to 3.3 V
• 12mA output drive capability at TTL levels
• Advanced, low power, sub-micron CMOS process
Block Diagram
VIN
X1
10 -20 MHz
pullable
crystal
S1, S0
MDS 3713 B 1 Revision 020900
Integrated Circuit Systems, Inc. • 525 Race Street • San Jose •CA •95126• (408)295-9800tel • www.icst.com
X2
Voltage
Controlled
Crystal
Oscillator
÷N
Output
Buffer
VCXOCLK
Pin Assignment
X1
VDD
PRELIMINARY INFORMATION
MK3713
1 8
2
MK3713
Low Cost 3.3 Volt VCXO
Divider Select Table
S1 S0 VCXOCLK (MHz)
0 0 Crystal ÷2
X2
7
S1
0 1 Crystal ÷4
1 0 Crystal ÷6
1 1 Crystal ÷8
VIN
GND
3
4
6
VCXOCLK
5
S0
Application Tip
For 1.544 MHz (T1), use 12.352 MHz crystal ÷8
8 pin (150 mil) SOIC
For 2.048 MHz (E1), use 12.288 MHz crystal ÷6
Pin Descriptions
Number Name Description
1 X1 Crystal connection. Connect to a pullable 10 to 20 MHz crystal.
2 VDD VDD. Connect to + 3.3 V.
3 VIN Voltage input to VCXO. Zero to 3.3 V analog input which controls the frequency of the VCXO.
4 GND Connect to ground.
5 S0 Select pin for VCXO divider. See table above.
6 VCXOCLK VCXO clock output. Full CMOS output amplitude.
7 S1 Select pin for VCXO divider. See table above.
8 X2 Crystal connection. Connect to a pullable 10 to 20 MHz crystal.
Pullable Crystal Specifications:
Correlation (load) Capacitance 14 pF
C0/C1 240 max
ESR 35 Ω max
Operating Temperature 0 to 70 °C
Initial Accuracy ±20 ppm
Temperature plus Aging Stability ±50 ppm
MDS 3713 B 2 Revision 020900
Integrated Circuit Systems, Inc. • 525 Race Street • San Jose •CA •95126• (408)295-9800tel • www.icst.com
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