115.2 – 137 MHz, -55 to 125°C, Endura™ Series Oscillator
Features
◼
◼
Applications
◼
◼
◼
◼
◼
◼
◼
◼
◼
◼
◼
Best acceleration sensitivity of 0.1 ppb/g
Any frequencies between 115.2 MHz and 137 MHz accurate
to 6 decimal points
100% pin-to-pin drop-in replacement to quartz-based XO
Excellent total frequency stability as low as ±20 ppm
Low power consumption of 3.8 mA typical at 1.8V
LVCMOS/LVTTL compatible output
AEC-Q100 qualified
Industry-standard packages: 2.0 x 1.6, 2.5 x 2.0, 3.2 x 2.5,
5.0 x 3.2, 7.0 x 5.0 mm x mm
RoHS and REACH compliant, Pb-free, Halogen-free and
Antimony-free
Contact SiTime
for up-screening and LAT programs
Avionics systems
Field communication systems
Telemetry applications
Electrical Characteristics
Table 1. Electrical Characteristics
All Min and Max limits are specified over temperature and rated operating voltage with 15 pF output load unless otherwise
stated. Typical values are at 25°C and nominal supply voltage.
Parameter
Output Frequency Range
Frequency Stability
Symbol
f
F_stab
Min.
115.20
-20
-25
-30
-50
Operating Temperature
Range (ambient)
T_use
-40
-40
-40
-55
Acceleration (g) sensitivity,
Gamma Vector
Supply Voltage
Current Consumption
F_g
–
Typ.
–
–
–
–
–
–
–
–
–
–
Max.
137
+20
+25
+30
+50
+85
+105
+125
+125
0.1
Unit
MHz
ppm
ppm
ppm
ppm
°C
°C
°C
°C
ppb/g
AEC-Q100 Grade 3
AEC-Q100 Grade 2
AEC-Q100 Grade 1
Extended cold, AEC-Q100 Grade1
Low sensitivity grade; total gamma over 3 axes; 15 Hz to 2 kHz;
MIL-PRF-55310, computed per section 4.8.18.3.1
All voltages between 2.25V and 3.63V including 2.5V, 2.8V, 3.0V and 3.3V
are supported.
Contact SiTime
for 1.5V support
No load condition, f = 125 MHz, Vdd = 2.25V to 3.63V
No load condition, f = 125 MHz, Vdd = 1.62V to 1.98V
Condition
Refer to Tables 13 to 15 for the exact
list of supported frequencies
Inclusive of Initial tolerance at 25°C, 1
st
year aging at 25°C, and
variations over operating temperature, rated power supply voltage
and load (15 pF ± 10%)
Frequency Range
Frequency Stability and Aging
Operating Temperature Range
Rugged Characteristics
Supply Voltage and Current Consumption
Vdd
Idd
1.62
2.25
–
–
Duty Cycle
Rise/Fall Time
Output High Voltage
DC
Tr, Tf
VOH
45
–
–
90%
1.8
–
6
4.9
–
1.5
1.5
–
1.98
3.63
8
6
55
3
2.5
–
V
V
mA
mA
%
ns
ns
Vdd
Vdd = 2.25V - 3.63V, 20% - 80%
Vdd = 1.8V, 20% - 80%
IOH = -4 mA (Vdd = 3.0V or 3.3V)
IOH = -3 mA (Vdd = 2.8V and Vdd = 2.5V)
IOH = -2 mA (Vdd = 1.8V)
IOL = 4 mA (Vdd = 3.0V or 3.3V)
IOL = 3 mA (Vdd = 2.8V and Vdd = 2.5V)
IOL = 2 mA (Vdd = 1.8V)
Pin 1, OE
Pin 1, OE
Pin 1, OE logic high or logic low
LVCMOS Output Characteristics
Output Low Voltage
VOL
–
–
10%
Vdd
Input Characteristics
Input High Voltage
Input Low Voltage
Input Pull-up Impedance
VIH
VIL
Z_in
70%
–
–
–
–
100
–
30%
–
Vdd
Vdd
k
Rev 1.00
July 24, 2020
www.sitime.com
SiT8945B
115.2 – 137 MHz, -55 to 125°C, Endura
™
Series Oscillator
Table 1. Electrical Characteristics
(continued)
Parameter
Startup Time
Enable/Disable Time
Standby Current
Symbol
T_start
T_oe
I_std
Min.
–
–
–
–
–
RMS Period Jitter
Peak-to-peak Period Jitter
RMS Phase Jitter (random)
T_jitt
T_pk
T_phj
–
–
–
–
–
–
Typ.
–
–
2.6
1.4
0.6
1.6
1.8
12
14
0.7
1.5
Max.
5
130
–
–
–
2.5
3
20
30
–
–
Unit
ms
ns
A
A
A
Jitter
ps
ps
ps
ps
ps
ps
f = 125 MHz, 2.25V to 3.63V
f = 125 MHz, 1.8V
PRELIMINARY
Condition
Measured from the time Vdd reaches its rated minimum value
f = 115.20 MHz. For other frequencies, T_oe = 100 ns + 3 * cycles
Vdd = 2.8V to 3.3V,
ST
= Low, Output is weakly pulled down
Vdd = 2.5V,
ST
= Low, Output is weakly pulled down
Vdd = 1.8V,
ST
= Low, Output is weakly pulled down
Startup and Resume Timing
f = 125 MHz, Vdd = 2.5V, 2.8V, 3.0V or 3.3V
f = 125 MHz, Vdd = 1.8V
f = 125 MHz, Integration bandwidth = 900 kHz to 7.5 MHz
f = 125 MHz, Integration bandwidth = 12 kHz to 20 MHz
Table 2. Pin Description
Pin
Symbol
Output Enable
1
OE/NC
No Connect
2
3
4
GND
OUT
VDD
Power
Output
Power
Functionality
H
[1]
: specified frequency output
L: output is high impedance. Only output driver is disabled.
Any voltage between 0 and Vdd or Open
[1]
: Specified frequency
output. Pin 1 has no function.
Electrical ground
[2]
Oscillator output
Power supply voltage
[2]
GND
2
Top View
OE/NC
1
4
VDD
3
OUT
Figure 1. Pin Assignments
Notes:
1. In OE mode, a pull-up resistor of 10k or less is recommended if pin 1 is not externally driven. If pin 1 needs to be left floating, use the NC option.
2. A capacitor of value 0.1 µF or higher between Vdd and GND is required.
Rev 1.00
Page 2 of 15
www.sitime.com
SiT8945B
115.2 – 137 MHz, -55 to 125°C, Endura
™
Series Oscillator
PRELIMINARY
Table 3. Absolute Maximum Limits
Attempted operation outside the absolute maximum ratings may cause permanent damage to the part. Actual performance
of the IC is only guaranteed within the operational specifications, not at absolute maximum ratings.
Parameter
Storage Temperature
Vdd
Electrostatic Discharge
Soldering Temperature (follow standard Pb free soldering guidelines)
Junction Temperature
[3]
Note:
3. Exceeding this temperature for extended period of time may damage the device.
Min.
-65
-0.5
–
–
–
Max.
150
4
2000
260
150
Unit
°C
V
V
°C
°C
Table 4. Thermal Consideration
[4]
Package
7050
5032
3225
2520
2016
JA, 4 Layer Board
(°C/W)
142
97
109
117
152
JA, 2 Layer Board
(°C/W)
273
199
212
222
252
JC, Bottom
(°C/W)
30
24
27
26
36
Note:
4. Refer to JESD51 for
JA
and
JC
definitions, and reference layout used to determine the
JA
and
JC
values in the above table.
Table 5. Maximum Operating Junction Temperature
[5]
Max Operating Temperature (ambient)
85°C
105°C
125°C
Maximum Operating Junction Temperature
93°C
113°C
133°C
Note:
5. Datasheet specifications are not guaranteed if junction temperature exceeds the maximum operating junction temperature.
Table 6. Environmental Compliance
Parameter
Mechanical Shock
Mechanical Vibration
Temperature Cycle
Solderability
Moisture Sensitivity Level
Condition/Test Method
MIL-STD-883F, Method 2002
MIL-STD-883F, Method 2007
JESD22, Method A104
MIL-STD-883F, Method 2003
MSL1 @ 260°C
Rev 1.00
Page 3 of 15
www.sitime.com
SiT8945B
115.2 – 137 MHz, -55 to 125°C, Endura
™
Series Oscillator
Test Circuit and Waveform
Vdd
Vout
Test
Point
PRELIMINARY
tr
80% Vdd
tf
4
Power
Supply
0.1µF
3
15pF
(including probe
and fixture
capacitance)
50%
20% Vdd
High Pulse
(TH)
Period
Low Pulse
(TL)
1
2
Vdd
OE/NC Function
1k
Figure 2. Test Circuit
[6]
Note:
6. Duty Cycle is computed as Duty Cycle = TH/Period.
Figure 3. Waveform
Timing Diagrams
90% Vdd
Vdd
50% Vdd
T_oe
Vdd
Pin 4 Voltage
T_start
No Glitch
during start up
OE Voltage
CLK Output
HZ
CLK Output
HZ
T_start: Time to start from power-off
T_oe: Time to re-enable the clock output
Figure 4. Startup Timing (OE Mode)
[7]
Figure 5. OE Enable Timing (OE Mode Only)
Vdd
OE Voltage
50% Vdd
T_oe
CLK Output
HZ
T_oe: Time to put the output in High Z mode
Figure 6. OE Disable Timing (OE Mode Only)
Note:
7. SiT8945 has “no runt” pulses and “no glitch” output during startup or resume.
There are five main types of display screens: LED, LCD, OLED, AMOLED, and TFT. Which screen is more suitable for what occasion? What should be paid attention to in their driving circuits?...
Project Name: Frequency Generator v2.0 Project Introduction: Through the menu on the LCD, the registers of the three timers of Mega8 can be set in real time. In this way, the interaction of the regist...
The applicants are required to have a good professional and English foundation, be responsible and conscientious. Those with relevant book translation experience are preferred. Please contact us. Trea...
[align=left][font=宋体][size=4] It's unlucky to say so. As the saying goes, when good people are unlucky, it's really hard to drink cold water. Just yesterday, just yesterday, a woman said that I scratc...
[i=s]This post was last edited by Rambo on 2017-9-27 15:50[/i] [align=left][color=#333333]In the previous section, we analyzed the connect() function in detail. Using connect() allows us to connect th...
I want to use the penmount touch screen controller in 6.0. The driver has been compiled into NK, but the pmser.dll file is not loaded after running CE? The registry settings are all correct, as shown ...
0 Introduction
With the development of my country's economy, the number of motor vehicles continues to increase. The growth of existing roads and other hardware facilities can no longer meet t...[Details]
Abstract: In order to generate a stable excitation signal, the design of a digital frequency synthesizer is implemented on FPGA using Verilog hardware language. The design includes accumulator, wav...[Details]
When choosing a laptop battery, you should consider several factors, such as power, appearance, and quality.
Regarding power, we often see that a manufacturer uses values such as the number ...[Details]
This controller uses PIC16C54 single-chip microcomputer as the controller, and it is very easy to use: just connect a telephone line to the loudspeaker through the controller, and you can rem...[Details]
Key Points
1. Now, in addition to high-end smartphones and tablets, users also expect to use touch screens in other applications, and they are gradually appearing in cars and instruments.
...[Details]
0 Introduction
In order to improve the automation control of shortwave transmitters, so that they can automatically process from far to near, the technicians here use the ICS system to complete the ...[Details]
summary
This article will briefly analyze the success and shortcomings of high-frequency DC-DC switching power supplies in the process of miniaturization (the second basic goal), and propose m...[Details]
In recent years, with the increasing maturity of LED technology, LED light sources have been increasingly widely used due to their advantages of using low-voltage power supply, low energy consumpti...[Details]
1. Project Introduction
Beijing Benz-Daimler Chrysler Co., Ltd. is a joint venture between Beijing BAIC Group and Benz-Daimler Chrysler. In October 2005, it started to build a new automobile ...[Details]
The Challenge:
Improving Siemens Wind
Turbine Controls
System software automated testing for regular releases, validating wind turbine control system components during the developme...[Details]
High-definition video surveillance has developed rapidly in recent years, mainly to solve the problem of unclear "details" in normal monitoring. Some cities use high-definition television surveilla...[Details]
Example of multitasking and resource reuse of programs
There is an electromechanical device with two buttons that control two different parts of the device.
Now the requirement is:
wh...[Details]
Facility cultivation technology mainly refers to the technology of using ordinary greenhouses or greenhouses to produce crops such as vegetables and fruits. With the popularization of facility cultiva...[Details]
Automobile testing is an important means to discover various problems in automobile design and development. Based on the test results, an objective evaluation of various automobile performances can...[Details]
Compared with traditional lighting fixtures, LED lamps do not need to use filters to produce colored light. They are not only highly efficient and pure in color, but also can achieve dynamic or gra...[Details]
Discrete Device
京公网安备 11010802033920号
EEWORLD
