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M672

VCSO WITH SELECTABLE OUTPUT FREQUENCY DIVIDER

Integrated Circuit Systems 

Integrated

Circuit

Systems, Inc.

Preliminary Information

M672

VCSO WITH SELECTABLE OUTPUT FREQUENCY DIVIDER

GENERAL DESCRIPTION

PIN ASSIGNMENT (5 x 7.5mm SMT)

The M672 is a Voltage Controlled SAW Oscillator

(VCSO) with a selectable output frequency

divider. The output frequency can be

pin-selected to be either the VCSO

fundamental frequency (Fvcso) or a

fraction of Fvcso (1/8, 1/4, or 1/2 depending

on frequency and order code). Available center

fundamental frequencies for the VCSO are between

125 and 700MHz. Divided Fvcso frequencies are in the

60 to 175MHz range. The M672 SAW (surface acoustic

wave) VCO is a high Q frequency source for low-jitter

clock generation. It 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

◆ Selectable divider chooses one of two output

frequencies; the Fvcso or its divided output frequency

◆ Low phase jitter 0.2ps rms typical (50kHz to 80MHz)

◆ Differential 3.3V LVPECL output

◆ Single 3.3V power supply

◆ Small 5 x 7.5mm SMT (surface mount) package

M67722

(Top View)

Figure 1: Pin Assignment

Sample of Available Output Frequencies

VCSO Center Corresponding

Fundamental

P Divider1

Frequency1 (MHz)

Output Frequency

Selections (MHz)

622.0800

4

622.0800, 155.5200

622.0800

8

622.0800, 77.7600

311.0400

2

311.0400, 155.5200

155.5200

2

155.5200, 77.7600

Table 1: Sample of Available Output Frequencies

Note 1: Specify VCSO center frequency and valid

corresponding P divider value at time of order.

See Ordering Information on pg. 4.

BLOCK DIAGRAM

M672

VIN

P_SEL

SAW Delay Line

Phase

Shifter

P Divider

P=1 (P_SEL=0)

or d (P_SEL=1) *

FOUT

nFOUT

Figure 2: Block Diagram

* The P divider value d (4, 8, or 2) is specified as part

of the order number (format is M672-d-xx).

M672 Datasheet Rev 0.2

Revised 07Apr2004

M672 VCSO with Selectable Output Frequency Divider

Integrated Circuit Systems, Inc. ● Communications Modules ● www.icst.com ● tel (508) 852-5400

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