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PDF ADCMP393 Data sheet ( Hoja de datos )
| Número de pieza | ADCMP393 | |
| Descripción | Single/Dual/Quad Comparators | |
| Fabricantes | Analog Devices | |
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Data Sheet
Single/Dual/Quad Comparators
With Known Power-Up State
ADCMP391/ADCMP392/ADCMP393
FEATURES
Single-supply voltage operation: 2.3 V to 5.5 V
Rail-to-rail common-mode input voltage range
Low input offset voltage across VCMR: 1 mV typical
Guarantees comparator output logic low from VCC = 0.9 V to
undervoltage lockout (UVLO)
Operating temperature range: −40°C to +125°C
Package types:
8-lead, narrow body SOIC (ADCMP391/ADCMP392)
14-lead, narrow body SOIC (ADCMP393)
14-lead TSSOP (ADCMP393)
APPLICATIONS
Battery management/monitoring
Power supply detection
Window comparators
Threshold detectors/discriminators
Microprocessor systems
GENERAL DESCRIPTION
The ADCMP391/ADCMP392/ADCMP393 are
single/dual/quad rail-to-rail input, low power comparators ideal
for use in general-purpose applications. These comparators
operate from a single supply voltage of 2.3 V to 5.5 V and draw
a minimal amount of current. The single ADCMP391
consumes only 18.6 µA of supply current. The dual ADCMP392
and the quad ADCMP393 consumes 22.1 µA and 26.8 µA of
supply current, respectively. The low voltage and low current
operation of these devices makes it ideal for battery-powered
systems.
The comparators features a common-mode input voltage range
of 200 mV beyond rails, an offset voltage of 1 mV typical across
the full common-mode range, and a UVLO monitor. In addition,
the design of the comparators allows a defined output state
upon power-up, a logic low output while the supply voltage is
less than the UVLO threshold.
The ADCMP391 and ADCMP392 are available in 8-lead,
narrow body SOIC package while the ADCMP393 is available
in a 14-lead, narrow body SOIC package and a 14-lead TSSOP
package. The comparators are specified to operate over the
−40°C to +125°C extended temperature range.
FUNCTIONAL BLOCK DIAGRAMS
VCC
ADCMP391
IN+
OUT
IN–
GND
Figure 1.
VCC
INA+
INA–
INB+
INB–
ADCMP392
OUTA
OUTB
GND
Figure 2.
VCC
INA+
INA–
INB+
INB–
INC+
INC–
IND+
IND–
ADCMP393
OUTA
OUTB
OUTC
OUTD
GND
Figure 3.
Rev. D
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 ©2014–2016 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com
1 page  
Data Sheet
ADCMP391/ADCMP392/ADCMP393
PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS
NIC 1
IN– 2
IN+ 3
GND 4
ADCMP391
TOP VIEW
(Not to Scale)
8 NIC
7 VCC
6 OUT
5 NIC
NOTES
1. NIC = NOT INTERNALLY CONNECTED.
Figure 4. ADCMP391 Pin Configuration
Table 4. ADCMP391 Pin Function Descriptions
Pin No.
Mnemonic
Description
1, 5, 8
NIC Not Internally Connected
2 IN− Comparator Inverting Input
3 IN+ Comparator Noninverting Input
4
GND
Device Ground
6 OUT Comparator Output, Open-Drain
7 VCC Device Supply Input
OUTA 1
INA– 2
INA+ 3
GND 4
ADCMP392
TOP VIEW
(Not to Scale)
8 VCC
7 OUTB
6 INB–
5 INB+
Figure 5. ADCMP392 Pin Configuration
Table 5. ADCMP392 Pin Function Descriptions
Pin No.
Mnemonic
Description
1
OUTA
Comparator A Output, Open-Drain
2
INA−
Comparator A Inverting Input
3
INA+
Comparator A Noninverting Input
4
GND
Device Ground
5
INB+
Comparator B Noninverting Input
6
INB−
Comparator B Inverting Input
7
OUTB
Comparator B Output, Open-Drain
8 VCC Device Supply Input
Rev. D | Page 5 of 17
5 Page 
Data Sheet
TYPICAL APPLICATIONS
ADDING HYSTERESIS
To add hysteresis, see Figure 28; two resistors are used to create
different switching thresholds, depending on whether the input
signal is increasing or decreasing in magnitude. When the input
voltage increases, the threshold is above VREF, and when the
input voltage decreases, the threshold is below VREF.
VCC = 5V
VREF = 2.5V INx–
VIN INx+
R1
RPULL-UP
OUTx
RLOAD
R2
VOUT
VIN_LOW VIN_HIGH
VIN
Figure 28. Noninverting Comparator Configuration with Hysteresis
The upper input threshold level is given by
VIN_HI
=
VREF (R1 + R2)
R2
(2)
Assuming RLOAD >> R2, RPULLUP.
The lower input threshold level is given by
( )VIN _ LO = VREF
R1 + R2 + RPULLUP
R2 + RPULLUP
− VCC R1
(3)
The hysteresis is the difference between these voltages levels.
VHYS
=
VREF R1RPULL−UP + VCCR1R2
R2(R2 + RPULL−UP )
(4)
ADCMP391/ADCMP392/ADCMP393
WINDOW COMPARATOR FOR POSITIVE VOLTAGE
MONITORING
When monitoring a positive supply, the desired nominal
operating voltage for monitoring is denoted by VM, IM is the
nominal current through the resistor divider, VOV is the
overvoltage trip point, and VUV is the undervoltage trip point.
VM
RX
VPH INA+
INA–
OUTA
RY VREF
VPL
RZ
INB+
INB–
OUTB
Figure 29. Positive Undervoltage/Overvoltage Monitoring Configuration
Figure 29 illustrates the positive voltage monitoring input
connection. Three external resistors, RX, RY, and RZ, divide the
positive voltage for monitoring, VM, into the high-side voltage,
VPH, and the low-side voltage, VPL. The high-side voltage is
connected to the INA+ pin and the low-side voltage is
connected to the INB− pin.
To trigger an overvoltage condition, the low-side voltage (in this
case, VPL) must exceed the VREF threshold on the INB+ pin.
Calculate the low-side voltage, VPL, by the following:
VPL
= VREF
= VOV
RX
RZ
+ RY
+ RZ
(5)
In addition,
RX + RY + RZ = VM/IM
(6)
Therefore, RZ, which sets the desired trip point for the
overvoltage monitor, is calculated as
RZ
=
(VREF
(VOV
)(VM )
)(IM )
(7)
To trigger the undervoltage condition, the high-side voltage,
VPH, must be less than the VREF threshold on the INA− pin. The
high-side voltage, VPH, is calculated by
VPH
= VREF
=
VUV
RY
RX +
+ RZ
RY +
RZ
(8)
Because RZ is already known, RY can be expressed as
RY
=
(VREF
(VUV
)(VM )
)(IM )
−
RZ
(9)
When RY and RZ are known, RX can be calculated by
RX = (VM/IM) – RY − RZ
(10)
If VM, IM, VOV, or VUV changes, each step must be recalculated.
Rev. D | Page 11 of 17
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet ADCMP393.PDF ] | |
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