Datenblatt-pdf.com


ADCMP394 Schematic ( PDF Datasheet ) - Analog Devices

Teilenummer ADCMP394
Beschreibung Single/Dual/Quad Comparators
Hersteller Analog Devices
Logo Analog Devices Logo 




Gesamt 18 Seiten
ADCMP394 Datasheet, Funktion
Data Sheet
Single/Dual/Quad Comparators with
Accurate Reference Output
ADCMP394/ADCMP395/ADCMP396
FEATURES
High accuracy reference output voltage: 1 V ± 0.9%
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 (ADCMP394)
10-lead MSOP (ADCMP395)
16-lead, narrow body SOIC (ADCMP396)
APPLICATIONS
Battery management/monitoring
Power supply detection
Window comparators
Threshold detectors/discriminators
Microprocessor systems
GENERAL DESCRIPTION
The ADCMP394/ADCMP395/ADCMP396 are single/dual/quad
rail-to-rail input, low power comparator ideal for use in general-
purpose applications. These comparators operate from a supply
voltage of 2.3 V to 5.5 V and draw a minimal amount of
current. The single ADCMP394 consumes only 33.9 μA of
supply current. The dual ADCMP395 and quad ADCMP396
consumes 37.2 μA and 41.6 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 comparator allows a defined output state upon
power-up. The comparator generates a logic low output if the
supply voltage is less than the UVLO threshold.
The ADCMP394/ADCMP395/ADCMP396 incorporates a 1 V ±
0.9% buffered reference voltage. The reference voltage output
can directly connect to the comparator input to serve as the trip
value for precise monitoring and detection of positive voltage. It
can also act as an offset when monitoring the negative voltage.
The ADCMP394 and ADCMP396 are available in 8-pin and 16-
lead, narrow body SOIC package, respectively. The ADCMP395
is available in a 10-lead MSOP package. The comparators are
specified to operate over the −40°C to +125°C extended
temperature range.
Rev. B
Document Feedback
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or 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.
FUNCTIONAL BLOCK DIAGRAMS
VCC
ADCMP394
REF
REF
IN+
IN– OUT
GND
Figure 1.
VCC
REF
INA+
INA–
INB+
INB–
ADCMP395
REF
OUTA
OUTB
GND
Figure 2.
VCC
REF
INA+
INA–
INB+
INB–
INC+
INC–
IND+
IND–
ADCMP396
REF
OUTA
OUTB
OUTC
OUTD
GND
Figure 3.
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






ADCMP394 Datasheet, Funktion
ADCMP394/ADCMP395/ADCMP396
Data Sheet
OUTB 1
OUTA 2
VCC 3
INA– 4
INA+ 5
INB– 6
INB+ 7
NIC 8
ADCMP396
TOP VIEW
(Not to Scale)
16 OUTC
15 OUTD
14 GND
13 IND+
12 IND–
11 INC+
10 INC–
9 REF
NIC = NOT INTERNALLY CONNECTED.
Figure 6. ADCMP396 Pin Configuration
Table 6. ADCMP396 Pin Function Descriptions
Pin No.
Mnemonic
Description
1
OUTB
Comparator B Output, Open Drain.
2
OUTA
Comparator A Output, Open Drain.
3 VCC Device Supply Input.
4
INA−
Comparator A Inverting Input.
5
INA+
Comparator A Noninverting Input.
6
INB−
Comparator B Inverting Input.
7
INB+
Comparator B Noninverting Input.
8 NIC Not Internally Connected.
9 REF Reference Output. This pin can be used to set up the comparator threshold.
10
INC−
Comparator C Inverting Input.
11
INC+
Comparator C Noninverting Input.
12
IND−
Comparator D Inverting Input.
13
IND+
Comparator D Noninverting Input.
14
GND
Device Ground.
15
OUTD
Comparator D Output, Open Drain.
16
OUTC
Comparator C Output, Open Drain.
Rev. B | Page 6 of 18

6 Page









ADCMP394 pdf, datenblatt
ADCMP394/ADCMP395/ADCMP396
Data Sheet
TYPICAL APPLICATIONS
ADDING HYSTERESIS
To add hysteresis, see Figure 33; 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 33. Noninverting Comparator Configuration with Hysteresis
The upper input threshold level is given by
VIN_HI
VREF (R1R2)
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
(R1RPULLUP ) VCC (R1R2)
R2(R2 RPULLUP )
(4)
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 REF
INB+
VPL INB–
RZ
OUTB
Figure 34. Positive Undervoltage/Overvoltage Monitoring Configuration
Figure 34 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 RZ
RX RY RZ

(8)
Because RZ is already known, RY can be expressed as
RY
VREF VM
VUV 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. B | Page 12 of 18

12 Page





SeitenGesamt 18 Seiten
PDF Download[ ADCMP394 Schematic.PDF ]

Link teilen




Besondere Datenblatt

TeilenummerBeschreibungHersteller
ADCMP391Single/Dual/Quad ComparatorsAnalog Devices
Analog Devices
ADCMP392Single/Dual/Quad ComparatorsAnalog Devices
Analog Devices
ADCMP393Single/Dual/Quad ComparatorsAnalog Devices
Analog Devices
ADCMP394Single/Dual/Quad ComparatorsAnalog Devices
Analog Devices
ADCMP395Single/Dual/Quad ComparatorsAnalog Devices
Analog Devices

TeilenummerBeschreibungHersteller
CD40175BC

Hex D-Type Flip-Flop / Quad D-Type Flip-Flop.

Fairchild Semiconductor
Fairchild Semiconductor
KTD1146

EPITAXIAL PLANAR NPN TRANSISTOR.

KEC
KEC


www.Datenblatt-PDF.com       |      2020       |      Kontakt     |      Suche