
MK3711
MDS 3711 H
1
Revision 072904
Integrat ed Circuit Systems ● 525 Race Stre et, San Jo se, CA 9 5126 ● te l (40 8 ) 2 97-12 01 ● www.ics t.co m
LOW COST 8 - 16 MHZ 3.3 VOLT VCXO
Description
The MK3711D is a drop-in replacement for the original
MK3711S device. Compared to these earlier devices,
the MK3711D offers a wider operating frequency range
and improved power supply noise rejection.
Used in conjunction with an external pullable quartz
crystal, this monolithic integrated circuit replaces more
costly hybrid (canned) VCXO devices. The MK3711 is
designed primarily for data and clock recovery
applications within end products such as ADSL
modems, set-top box receivers, and telecom systems.
The MK3711D exhibits a moderate VCXO gain of
120ppm/V typical, when used with a high quality
external pullable quartz crystal.
The frequency of the on-chip VCXO is adjusted by an
external control voltage input into pin VIN. Since VIN is
a high impedance input, it can be driven directly from
an PWM RC integrator circuit. Frequency output
increases with VIN voltage input. The usable range of
VIN is 0 to 3V.
Features
MK3711D is a drop-in replacement for the earlier
MK3711S device
MK3711D offers an 8-16 MHz output frequency
range and improved power supply noise rejection
Uses an inexpensive 8 to 16 MHz external crystal
On-chip VCXO with guaranteed pull range of ±115
ppm minimum
VCXO tuning voltage 0 to 3.3 V
Packaged in 8 pin SOIC (150 mil wide)
MK3711B is Obsolete
Block Diagram
8-16 MHz
Voltage
Controlled
Crystal
Oscillator
X1
X2
VIN
8-16 MHz
Pullable
Crystal
VDD
GND