Information

Texas Instruments Signal Chain Guide 2013 | 29
Amplifiers and Comparators
Comparators
The LMV7231 is a 1.5% accurate Hex Window Comparator which can be used to
monitor power supply voltages. The device uses an internal 400 mV reference for the
comparator trip value. The comparator set points can be set via external resistor divid-
ers. The LMV7231 has six outputs (CO1-CO6) that signal an under-voltage or over-volt-
age event for each power supply input. An output (AO) is also provided to signal when
any of the power supply inputs have an over
-voltage or under-voltage event. This ability
to signal an under-voltage or over-voltage event for the individual power supply inputs,
in addition to an output to signal such an event on any of the power supply inputs, adds
unparalleled system protection capability.
Hex Window Comparator with 1.5% Precision and 400 mV Reference
LMV7231
Key Features
• Highaccuracyvoltagereference:400mV
• Thresholdaccuracy:±1.5%(max)
• Widesupplyvoltagerange2.2Vto5.5V
• Input/outputvoltagerangeaboveV+
• Internalhysteresis:6mV
• Propagationdelay:2.6µsto5.6µs
• Supplycurrent7.7µAperchannel
• 24-leadWQFNpackage
• Temperaturerange:–40°Cto125°C
Applications
• Powersupplyvoltagedetection
• Batterymonitoring
• Handheldinstruments
• Relaydriving
• Industrialcontrolsystems
LMV7231 functional block diagram
Get more information: www.ti.com/product/LMV7231
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+
-
+
Ref
-
+
-
+
-
+
-
+
-
+
-
+
-
+
-
+
-
+
-
+
B
A
B
A
B
A
B
A
B
A
B
A
UV
- IN1
-IN2
-IN3
- IN4
-IN5
- IN6
+ IN1
+ IN2
+IN3
+IN4
+IN5
+IN6
COPOL
CO1
CO2
CO4
CO3
CO5
CO6
*
*
*
*
*
*
*
*
*
*
*
AO
*
AOSEL
*
1
OV
1
UV
2
OV
2
UV
3
OV
3
UV
4
OV
4
UV
5
OV
5
UV
6
OV
6
OV
1
OV
2
OV
3
OV
4
OV
5
OV
6
UV
1
UV
2
UV
3
UV
4
UV
5
UV
6
* Open
Drain