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PDF SC3044B Data sheet ( Hoja de datos )
| Número de pieza | SC3044B | |
| Descripción | 251.00 MHz Differential Sine-Wave Clock | |
| Fabricantes | RF Monolithics | |
| Logotipo |  |
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Preliminary
• 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 os-
cillation is made possible by surface-acoustic-wave (SAW) technology. The design results in low jitter, com-
pact size, and low power consumption. Differential outputs provide a sine wave that is capable of driving
50 Ω loads.
SC3044B
251.00 MHz
Differential
Sine-Wave
Clock
Rating
Power Supply Voltage (VCC at Terminal 1)
Input Voltage (ENABLE at Terminal 8)
Case Temperature (Powered or Storage)
Electrical Characteristics
Value
0 to +4.0
0 to +4.0
-40 to +85
Units
VDC
VDC
°C
SMC-8 Case
Output Frequency
Q and Q Output
Characteristic
Absolute Frequency
Tolerance from 286.0 MHz
Voltage into 50Ω (VSWR ≤ 1.2)
Operating Load VSWR
Sym
fO
∆fO
VO
Notes
1, 2
1, 3
Minimum
250.910
0.60
Typical
Maximum
251.090
±300
1.1
2:1
Units
MHz
ppm
VP-P
Symmetry
3, 4, 5
49
51 %
Harmonic Spurious
Nonharmonic Spurious
3, 4, 6
-30 dBc
-60 dBc
Q and Q Period Jitter
Output (Disabled)
No Noise on VCC
200 mVP-P from 1 MHz to ½ fO on
Amplitude into 50 Ω
Output DC Resistance (between Q & Q)
ENABLE (Terminal 14)
Input HIGH Voltage
Input LOW Voltage
Input HIGH Current
Input LOW Current
Propagation Delay
DC Power Supply
Operating Voltage
Operating Current
Operating Ambient Temperature
Lid Symbolization (YY = Year, WW = Week)
3, 4, 6, 7
15 30
3, 4, 7, 8
35
3, 9 75
3 50
VIH
VCC-0.1
VCC
VCC+0.1
VIL 0.0
0.20
IIH 3, 9
35
IIL -1
tPD 1
VCC
ICC
1, 3
+3.13
+3.30
20
+3.47
40
TA 1, 3
0
+70
RFM SC3044B 251.00 MHz YYWW
psP-P
psP-P
mVP-P
KΩ
V
V
mA
mA
ms
VDC
mA
°C
mCAUTION: Electrostatic Sensitive Device. Observe precautions for handling.
oNOTES:
.c1. Unless otherwise noted, all specifications include any combination of load 6. Jitter and other spurious outputs induced by externally generated electrical noise
VSWR, VCC, and TA. In addition, Q and Q are terminated into 50 Ω loads to
on VCC or mechanical vibration are not included. Dedicated external voltage
Uground. (See: Typical Test Circuit.)
regulation and careful PCB layout are recommended for optimum performance.
t42. One or more of the following United States patents apply: 4,616,197; 4,670,681; 7. Applies to period jitter of Q and Q. Measurements are made with the Tektronix
4,760,352.
CSA803 signal analyzer with at least 1000 samples.
e3. The design, manufacturing process, and specifications of this device are subject 8. Period jitter measured with a 200 mVP-P sine wave swept from 1 MHz to one-half
he4.
taS5.
to change without notice.
Only under the nominal conditions of 50 Ω load impedance with VSWR ≤ 1.2 and
nominal power supply voltage.
Symmetry is defined as the pulse width (in percent of total period) measured at
the 50% points of Q or Q. (See: Timing Definitions.)
9.
of fO at the VCC power supply terminal.
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.)
.DaRF Monolithics, Inc. Phone: (972) 233-2903
Fax: (972) 387-9148
RFM Europe
Phone: 44 1963 251383
Fax: 44 1963 251510
www©1999 by RF Monolithics, Inc. The stylized RFM logo are registered trademarks of RF Monolithics, Inc.
E-mail: [email protected]
http://www.rfm.com
SC3044B-020900
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