MK3725 Datasheet, PDF (1/6 Pages) Integrated Circuit Systems – DUAL OUTPUT 3.3 VOLT VCXO

MK3725
DUAL OUTPUT 3.3 VOLT VCXO
Description
The MK3725 is a low cost, high-performance, two
output 3.3 Volt VCXO and PLL clock synthesizer
designed to replace expensive VCXOs and crystals.
The patented on-chip Voltage Controlled Crystal
Oscillator accepts a 0 to 3.3 V input voltage to cause
the output clocks to vary by ±115 ppm minimum. Using
our analog Phase Locked Loop (PLL) techniques, the
device uses an external, fundamental mode pullable
crystal input to produce output clocks of 2x the input
frequency.
The frequency of the on-chip VCXO is adjusted by an
external control voltage input into pin VIN. Because
VIN is a high impedance input, it can be driven directly
from an PWM RC integrator circuit.
Features
• Packaged in 8-pin SOIC
• Operating voltage of 3.3 V (±5%)
• Two pullable output clocks of 24-36 MHz
• Uses a fundamental mode 12-18 MHz pullable
crystal
• On-chip patented VCXO with pull range of 230 ppm
(minimum)
• VCXO tuning voltage of 0 to 3.3 V
• 12 mA output drive capability at TTL levels
• Advanced, low power, sub-micron CMOS process
Block Diagram
VIN
X1
X2
12-18 MHz
Pullable
Crystal
VDD
V o lta g e
C o n tro lle d
Crystal
O s cilla to r
Frequency
C lo c k
D o u b le r
GND
2
24-36 MHz
MDS 3725 A
1
Revision 100803
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