SC3045B
• Quartz SAW Frequency Stability
• Fundamental Fixed Frequency
621.60 MHz
Differential
Sine-Wave
Clock
• 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
0 to +4.0
0 to +4.0
-40 to +85
Units
VDC
VDC
°C
Power Supply Voltage (V at Terminal 1)
CC
Input Voltage (ENABLE at Terminal 8)
Case Temperature (Powered or Storage)
SMC-8 Case
Electrical Characteristics
Characteristic
Sym
Notes
Minimum
Typical
Maximum
Units
Output Frequency
Absolute Frequency
f
MHz
621.60
O
1, 2
Tolerance from 621.6 MHz
Voltage into 50Ω (VSWR ≤ 1.2)
Operating Load VSWR
Symmetry
Δf
±250
1.1
2:1
51
ppm
O
V
0.60
49
Q and Q Output
O
V
1, 3
P-P
3, 4, 5
3, 4, 6
%
Harmonic Spurious
-30
-60
30
dBc
dBc
Nonharmonic Spurious
No Noise on V
3, 4, 6, 7
3, 4, 7, 8
3, 9
15
ps
Q and Q Period Jitter
Output (Disabled)
CC
P-P
200 mV
from 1 MHz to ½ f on
35
ps
P-P
O
P-P
Amplitude into 50 Ω
75
mV
P-P
50
KΩ
V
3
Output DC Resistance (between Q & Q)
ENABLE (Terminal 14)
Input HIGH Voltage
V
V
-0.1
V
V
+0.1
IH
CC
CC
CC
Input LOW Voltage
Input HIGH Current
Input LOW Current
Propagation Delay
Operating Voltage
Operating Current
V
I
0.0
0.20
5
V
IL
3
mA
mA
ms
VDC
mA
°C
3, 9
IH
I
-1
IL
t
1
PD
DC Power Supply
V
I
+3.13
0
+3.30
20
+3.47
40
CC
1, 3
1, 3
CC
Operating Ambient Temperature
T
+70
A
Lid Symbolization (YY = Year, WW = Week)
RFM SC3045B 621.6 MHz YYWW
CAUTION: Electrostatic Sensitive Device. Observe precautions for handling.
NOTES:
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.)
electrical noise on V or mechanical vibration are not included.
CC
Dedicated external voltage regulation and careful PCB layout are
recommended for optimum performance.
2. One or more of the following United States patents apply: 4,616,197;
4,670,681; 4,760,352.
7. Applies to period jitter of Q and Q. Measurements are made with the
Tektronix CSA803 signal analyzer with at least 1000 samples.
3. The design, manufacturing process, and specifications of this device
are subject to change without notice.
8. Period jitter measured with a 200 mV
sine wave swept from 1 MHz
P-P
to one-half of f at the V power supply terminal.
O
CC
4. Only under the nominal conditions of 50 Ω load impedance with
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.)
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
www.RFM.com
©2008 by RF Monolithics, Inc.
E-mail: info@rfm.com
Page 1 of 2
SC3045B - 3/27/08
5秒后页面跳转
NTC热敏电阻与PTC热敏电阻的应用原理及应用范围
GTO与普通晶闸管相比为什么可以自关断？为什么普通晶闸管不能呢？从GTO原理、应用范围带你了解原因及推荐型号
LF353数据手册解读：特性、应用、封装、引脚说明、电气参数及替换型号推荐
A4950资料手册解读：特性、应用、封装、引脚功能、电气参数及代换型号
微信公众号
抖音公众号
浙公网安备 33010502006866号 浙ICP备10014259号-119
营业执照ICP证
技术参数
数据手册
如果您发现信息不准确，
