OMO ElectronicOMO Electronic
Expand menu
Hello, Sign inMy Account
0 Cart

ADM2914-1ARQZ

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P17
ADM2914 Data Sheet
Rev. F | Page 6 of 16
TYPICAL PERFORMANCE CHARACTERISTICS
0.505
0.503
0.504
0.501
0.502
0.499
0.500
0.497
0.498
0.495
0.496
–40 –30 –20 –10 0 10 20 30 40 50 60 70 80
TEMPERATURE (°C)
08170-012
THRESHOLD VOLTAGE,
V
UOT
(V)
Figure 4. Input Threshold Voltage vs. Temperature
100
50
–40 –15 10 35 60 85
TEMPERATURE (°C)
I
CC
(µA)
08170-013
V
CC
= 6V
V
CC
= 2.3V
V
CC
= 3.3V
95
90
85
80
75
70
65
60
55
Figure 5. Supply Current vs. Temperature
6.80
6.40
–40 –15 10 35 60 85
TEMPERATURE (°C)
V
CC
(V)
08170-014
6.75
6.70
6.65
6.60
6.55
6.50
6.45
200µA
1mA
2mA
5mA
10mA
Figure 6. V
CC
Shunt Voltage vs. Temperature
6.80
6.40
0246810
I
CC
(mA)
V
CC
(V)
08170-014
6.75
6.70
6.65
6.60
6.55
6.50
6.45
+25°C
–40°C
+85°C
Figure 7. V
CC
Shunt Voltage vs. I
CC
1.005
1.004
1.003
1.002
1.001
1.000
0.999
0.998
0.997
0.996
0.995
–40 –20 0 20 40 60 80
TEMPERATURE (°C)
REFERENCE VOLTAGE, V
REF
(V)
08170-016
Figure 8. Buffered Reference Voltage vs. Temperature
1000
900
800
700
600
500
400
300
200
100
0
0.1 1 10 100
COMPARATOR OVERDRIVE (% OF V
TH
)
TRANSIENT DURATION (µs)
08170-017
V
CC
= 2.3V
V
CC
= 6V
RESET ASSERTED
ABOVE THE LINE
Figure 9. Transient Duration vs. Comparator Overdrive
Data Sheet ADM2914
Rev. F | Page 7 of 16
12
11
10
9
8
7
6
–40 –15 10 35 60 85
TEMPERATURE (°C)
08170-018
UV/OV TIMEOUT PERIOD,
t
UOTO
(ms)
Figure 10.
UV
/
OV
Timeout Period vs. Temperature
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
–0.1
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
SUPPLY VOLTAGE, V
CC
(V)
UV VOLTAGE (V)
08170-019
WITH 10kΩ PULL-UP
WITHOUT PULL-UP
Figure 11.
UV
Output Voltage vs. V
CC
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
012345
SUPPLY VOLTAGE, V
CC
(V)
08170-020
UV VOLTAGE (V)
VHx = 0.55V
SEL = V
CC
Figure 12.
UV
Output Voltage vs. V
CC
3.0
2.5
2.0
1.5
1.0
0.5
0
–0.5
0123456
SUPPLY VOLTAGE, V
CC
(V)
08170-021
PULL-DOWN CURRENT I
UV
(mA)
VHx = 0.45V
SEL = V
CC
UV = 150mV
UV = 50mV
Figure 13. I
SINK
, I
UV
vs. V
CC
1000
900
800
700
600
500
400
300
200
100
0
051015
I
SINK
(mA)
08170-022
+85°C
+25°C
– 40°C
UV/OV, V
OL
(mV)
Figure 14.
UV
/
OV
Voltage Output Low vs. Output Sink Current
10k
1k
100
10
1
0.1 1 10 100 1000
TIMER PIN CAPACITANCE C
TIMER
(nF)
08170-023
UV/OV TIMEOUT PERIOD, t
UOTO
(ms)
Figure 15.
UV
/
OV
Timeout Period vs. Capacitance
ADM2914 Data Sheet
Rev. F | Page 8 of 16
THEORY OF OPERATION
VOLTAGE SUPERVISION
The ADM2914 supervises up to four voltage rails for overvoltage
and undervoltage conditions. Two pins, VHx and VLx, are
assigned to monitor each rail, one for overvoltage detection and
the other for undervoltage detection. Each pin is connected to
the input of an internal voltage comparator, and its voltage level
is internally compared with a 0.5 V voltage reference with
accuracy of ±1.5%.
The output of each of the internal undervoltage comparators is
tied to a common
UV
output pin. Likewise, the outputs of the
internal overvoltage comparators are tied to a common
OV
output pin.
VH1
1.8V
VL1
VH2
VL2
VH3
VL3
VH4
VL4
SEL
TIMER
UV
OV
LATCH/DIS
REF
GND
V
CC
ADM2914
2.5V
3.3V
5
V
SYSTEM
PSU
08170-003
Figure 16. Typical Applications Diagram
POLARITY CONFIGURATION
The ADM2914 is capable of monitoring supply voltages of both
positive and negative polarities. The SEL pin is a three-state pin
that determines the polarity of Input 3 and Input 4. As summarized
in Table 5, the SEL pin is either connected to GND, V
CC
, or left
unconnected.
When an input is configured to monitor a positive voltage, using
the three-resistor scheme shown in Figure 17, VHx is connected
to the high-side tap of the resistor divider and VLx is connected
to the low-side tap of the resistor divider.
Conversely, when an input is configured to monitor a negative
voltage, UVx and OVx are swapped internally. The negative
voltage for monitoring is then connected as shown in Figure 18.
VHx is still connected to the high-side tap and VLx is still
connected to the low-side tap. Within this configuration, an
undervoltage condition occurs when the monitored voltage is less
negative than the programmed threshold, and an overvoltage
condition occurs when the monitored voltage is more negative
than the configured threshold.
Table 5. Polarity Configuration
Input 3 Input 4
SEL Pin Polarity UV Condition OV Condition Polarity UV Condition OV Condition
Connected to V
CC
Positive VH3 < 0.5 V VL3 > 0.5 V Positive VH4 < 0.5 V VL4 > 0.5 V
Left Unconnected Positive VH3 < 0.5 V VL3 > 0.5 V Negative VL4 > 0.5 V VH4 < 0.5 V
Connected to GND Negative VL3 > 0.5 V VH3 < 0.5 V Negative VL4 > 0.5 V VH4 < 0.5 V
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P17

ADM2914-1ARQZ

Mfr. #:
Buy ADM2914-1ARQZ
Manufacturer:
Analog Devices Inc.
Description:
Supervisory Circuits Quad UV/OV +/- VTG Supervisor
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
Payment:
T/T Paypal Visa MoneyGram Western Union

Products related to this Datasheet