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PDF ( 数据手册 , 数据表 ) ADM12914

零件编号 ADM12914
描述 Quad UV/OV Positive/Negative Voltage Supervisor
制造商 Analog Devices
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ADM12914 数据手册, 描述, 功能
Data Sheet
±0.8% Accurate Quad UV/OV
Positive/Negative Voltage Supervisor
ADM12914
FEATURES
Quad undervoltage/overvoltage (UV/OV) positive/negative
supervisor
Supervises up to two negative rails
Adjustable UV and OV input thresholds
Industry leading threshold accuracy over the extended
temperature range: ±0.8%
1 V buffered reference output
Open-drain UV and OV reset outputs
Adjustable reset timeout with disable option
Outputs guaranteed down to VCC of 0.9 V
Glitch immunity
62 µA supply current
16-lead QSOP package
Specified from −40°C to +125°C
APPLICATIONS
Server supply monitoring
FPGA/DSP core and I/O voltage monitoring
Telecommunications equipment
Medical equipment
FUNCTIONAL BLOCK DIAGRAM
VCC TIMER
ADM12914
VH1
500mV
TIMER
VL1
VH2
500mV
UV
VL2
VH3
OUTPUT
LOGIC
500mV
VL3
VH4
500mV
VL4
MUX
SEL GND
Figure 1.
OV
LOGIC
REF
LATCH/DIS
REF
GENERAL DESCRIPTION
The ADM12914 is a quad voltage supervisory IC ideally suited
for monitoring multiple rails in a wide range of applications.
Each monitored rail has two dedicated input pins, VHx and VLx,
which allows each rail to be monitored for both undervoltage
(UV) and overvoltage (OV) conditions with high threshold
accuracy of ±0.8%. Common active low undervoltage (UV) and
overvoltage (OV) pins are shared by each of the monitored
voltage rails.
The ADM12914 includes a 1 V buffered reference output, REF,
that acts as an offset when monitoring a negative voltage. The
three-state SEL pin determines the polarity of the third and
fourth inputs, that is, it configures the device to monitor
positive or negative supplies.
The device incorporates an internal shunt regulator that enables
the device to be used in higher voltage systems. This feature
requires a resistor to be placed between the main supply rail and
the VCC pin to limit the current flow into the VCC pin at a level
no greater than 10 mA. The ADM12914 uses the internal shunt
regulator to regulate VCC if the supply line exceeds the absolute
maximum ratings.
The ADM12914 is available in two models. The ADM12914-1
offers a latching overvoltage output that can be cleared by
toggling the LATCH input pin. The ADM12914-2 has a disable
pin that can override and disable both the UV and the OV
output signals.
The ADM12914 is available in a 16-lead QSOP package. The
device is specified over the extended temperature range of
−40°C to +125°C.
Rev. E
Document Feedback
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityisassumedbyAnalogDevices for itsuse,nor foranyinfringementsofpatentsor other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 ©2009–2015 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com







ADM12914 pdf, 数据表
Data Sheet
TYPICAL PERFORMANCE CHARACTERISTICS
0.505
0.504
0.503
0.502
0.501
0.500
0.499
0.498
0.497
0.496
0.495
–40 –25 –10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
Figure 4. Input Threshold Voltage vs. Temperature
90
85
VCC = 6V
80
75 VCC = 3.3V
70
65 VCC = 2.3V
60
55
50
–40 –25 –10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
Figure 5. Supply Current vs. Temperature
6.80
6.75
6.70
200µA
1mA
2mA
5mA
10mA
6.65
6.60
6.55
6.50
6.45
6.40
–40 –25 –10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
Figure 6. VCC Shunt Voltage vs. Temperature
ADM12914
6.80
6.75
6.70
6.65
6.60
6.55
6.50
6.45
6.40
0
–40°C
+85°C
+25°C
2 468
ICC (mA)
Figure 7. VCC Shunt Voltage vs. ICC
10
1.020
1.015
1.010
1.005
1.000
0.995
0.990
0.985
0.980
–40 –25 –10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
Figure 8. Buffered Reference Voltage vs. Temperature
1000
900
RESET ASSERTED
ABOVE THE LINE
800
700
600 VCC = 6V
500
400
300 VCC = 2.3V
200
100
0
0.1 1
10 100
COMPARATOR OVERDRIVE (% OF VUOT)
Figure 9. Transient Duration vs. Comparator Overdrive
Rev. E | Page 7 of 16







ADM12914 equivalent, schematic
Data Sheet
TYPICAL APPLICATIONS
PSU
5V
3.3V
2.5V
1.8V
312kΩ
2.37kΩ 200kΩ
33.6kΩ 2.34kΩ 111kΩ
34.8kΩ 1.82kΩ 120kΩ
27.1kΩ 3.05kΩ
45.3kΩ
VH1 VCC SEL
VL1 TIMER
VH2
ADM12914
VL2
VH3 UV
VL3 OV
VL4
VH4
LATCH/DIS
REF
GND
SYSTEM
ADM12914
Figure 24. Typical Application Diagram for Monitoring 5 V, 3.3 V, 2.5 V, and 1.8 V with 1.5% Supply Tolerance and 5% Input Tolerance Requirement
PSU
+12V
–12V
1.98MΩ
5.62kΩ
83.5kΩ
1420kΩ
12kΩ
51.7kΩ
1kΩ
VH1 VCC SEL
VL1 TIMER
VH2
ADM12914
VL2
VL3 UV
VH3
OV
VL4
VH4
LATCH/DIS
REF
GND
SYSTEM
Figure 25. Typical Application Diagram for Monitoring 12 V with 1.5% Supply Tolerance and 5% Input Tolerance Requirement;
−12 V with 3% Supply Tolerance and 15% Input Tolerance Requirement
Rev. E | Page 15 of 16










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