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©2008 by RF Monolithics, Inc.

SC3045B - 3/27/08

Electrical Characteristics

CAUTION: Electrostatic Sensitive Device. Observe precautions for handling.

NOTES:

Characteristic

Sym

Notes

Minimum

Typical

Maximum

Units

Output Frequency

Absolute Frequency

1, 2

621.60

MHz

Tolerance from 621.6 MHz

±250

ppm

Q and Q Output

Voltage into 50

Ω (VSWR ≤ 1.2)

1, 3

0.60

1.1

Operating Load VSWR

2:1

Symmetry

3, 4, 5

49

51

%

Harmonic Spurious

3, 4, 6

-30

dBc

Nonharmonic Spurious

-60

dBc

Q and Q Period Jitter

3, 4, 6, 7

15

30

3, 4, 7, 8

35

Output (Disabled)

Amplitude into 50

Ω

3, 9

75

Output DC Resistance (between Q & Q)

3

50

K

Ω

ENABLE (Terminal 14)

Input HIGH Voltage

3, 9

V

Input LOW Voltage

0.0

0.20

V

Input HIGH Current

35

mA

Input LOW Current

-1

mA

Propagation Delay

1

ms

DC Power Supply

Operating Voltage

1, 3

+3.13

+3.30

+3.47

VDC

Operating Current

20

40

mA

Operating Ambient Temperature

1, 3

0

+70

°C

Lid Symbolization (YY = Year, WW = Week)

RFM SC3045B 621.6 MHz YYWW

• Quartz SAW Frequency Stability

• Fundamental Fixed Frequency

• Very Low Jitter and Power Consumption

• Rugged, Miniature, Surface-Mount Case

• Low-Voltage Power Supply (3.3 VDC)

This digital clock is designed for use in high-speed communications timing systems. Fundamental-mode

oscillation is made possible by surface-acoustic-wave (SAW) technology. The design results in low jitter,

compact size, and low power consumption. Differential outputs provide a sine wave that is capable of driving

50

Ω loads.

Absolute Maximum Ratings

Rating

Value

Units

0 to +4.0

VDC

Input Voltage (ENABLE at Terminal 8)

0 to +4.0

VDC

Case Temperature (Powered or Storage)

-40 to +85

°C

621.60 MHz

Differential

Sine-Wave

Clock

SC3045B

SMC-8 Case

1.

Unless otherwise noted, all specifications include any combination of

load VSWR, VCC, and TA. In addition, Q and Q are terminated into

50

Ω loads to ground. (See: Typical Test Circuit.)

2.

One or more of the following United States patents apply: 4,616,197;

4,670,681; 4,760,352.

3.

The design, manufacturing process, and specifications of this device

are subject to change without notice.

4.

Only under the nominal conditions of 50

Ω load impedance with

VSWR

≤ 1.2 and nominal power supply voltage.

5.

Symmetry is defined as the pulse width (in percent of total period)

measured at the 50% points of Q or Q. (See: Timing Definitions.)

6.

Jitter and other spurious outputs induced by externally generated

Dedicated external voltage regulation and careful PCB layout are

recommended for optimum performance.

7.

Applies to period jitter of Q and Q. Measurements are made with the

Tektronix CSA803 signal analyzer with at least 1000 samples.

8.

9.

The outputs are enabled when Terminal 8 is at logic HIGH.

Propagation delay is defined as the time from the 50% point on the

rising edge of ENABLE to the 90% point on the rising edge of the

output amplitude or as the fall time from the 50% point to the 10%

point. (SEE: Timing Definitions.)