M675 Datasheet, PDF (1/6 Pages) Integrated Circuit Systems – VOLTAGE CONTROLLED SAW OSCILLATOR

Preliminary Information
M675
VOLTAGE CONTROLLED SAW OSCILLATOR
GENERAL DESCRIPTION
The M675 is a VCSO (Voltage Controlled SAW
Oscillator) frequency source for low-jitter
clock generation. An integrated SAW
(surface acoustic wave) delay line
implements the high-Q VCO (voltage
controlled oscillator) function, which
results in low output phase noise and very low jitter.
The M675-01 is available in a range of center
frequencies from 125 to 175 MHz. The M675-02
provides 500 to 700 MHz. Guaranteed minimum
pull-range of ±100 ppm meets GbE requirements.
(It also fully satisfies ±50 ppm minimum pull-range
specification commonly required.) Industry-standard
Kvco (VCO Gain) provides full replacement compati-
bility. The M675 is well suited for phase-locked loop
implementations, clock and data recovery circuits, and
other timing applications in telecom and optical fiber
networking systems (e.g., SONET/SDH).
FEATURES
◆ Integrated SAW device
◆ M675-01 output frequencies from 125 to 175 MHz
M675-02 output frequencies from 500 to 700 MHz
(Specify center frequency at time of order)
◆ Industry-standard Kvco for full compatibility
◆ Low phase jitter 0.2ps rms typical for the M675-02
(50kHz to 80MHz)
◆ Differential 3.3V LVPECL output
◆ Single 3.3V power supply
◆ Small 5 x 7.5mm SMT (surface mount) package
BLOCK DIAGRAM
M6^M70⁶⁷⁵
PIN ASSIGNMENT (5 x 7.5mm SMT)
M_M6₆7₇5₅
(Top View)
Figure 1: Pin Assignment
Sample of Available Output Frequencies
VCSO Center Frequencies¹ (MHz)
M675-01
M675-02
Applications
155.5200
622.0800
SONET/SDH
156.2500
625.0000
Gigabit Ethernet
161.1328
644.5313 Gigabit Ethernet FEC
167.3316
669.3266
SONET/SDH FEC
Table 1: Sample of Available Output Frequencies
Note 1: Specify VCSO center frequencies at time of order
VIN
CLK_EN
SAW Delay Line
Phase
Shifter
FOUT
nFOUT
Figure 2: Block Diagram
M675 Datasheet Rev 0.5
Revised 29Jul2009
M675 Voltage Controlled SAW Oscillator
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