AD737 Datasheet PDF - Analog Devices
| Part Number | AD737 | |
| Description | True RMS-to-DC Converter | |
| Manufacturers | Analog Devices | |
| Logo |  |
|
|
There is a preview and AD737 download ( pdf file ) link at the bottom of this page. Total 24 Pages | ||
Preview 1 page No Preview Available !
Data Sheet
FEATURES
Computes
True rms value
Average rectified value
Absolute value
Provides
200 mV full-scale input range (larger inputs with input
scaling)
Direct interfacing with 3½ digit CMOS analog-to-digital
converters (ADCs)
High input impedance: 1012 Ω
Low input bias current: 25 pA maximum
High accuracy: ±0.2 mV ± 0.3% of reading
RMS conversion with signal crest factors up to 5
Wide power supply range: ±2.5 V to ±16.5 V
Low power: 25 μA (typical) standby current
No external trims needed for specified accuracy
The AD737 output is negative going; the AD736 is a positive
output-going version of the same basic device
GENERAL DESCRIPTION
The AD737 is a low power, precision, monolithic, true rms-to-dc
converter. It is laser trimmed to provide a maximum error of
±0.2 mV ± 0.3% of reading with sine wave inputs. Furthermore,
it maintains high accuracy while measuring a wide range of
input waveforms, including variable duty cycle pulses and
triac (phase) controlled sine waves. The low cost and small
physical size of the AD737 make it suitable for upgrading the
performance of non-rms precision rectifiers in many applications.
Compared to these circuits, the AD737 offers higher accuracy at
equal or lower cost.
The AD737 computes the rms value of both ac and dc input
voltages, and is ac-coupled by adding an input capacitor. In this
mode, the AD737 resolves input signal levels of 100 μV rms or
less, despite variations in temperature or supply voltage. High
accuracy is maintained for input waveforms with crest factors of
1 to 3 and crest factors at 2.5% or less with respect to full-scale
input level.
The AD737 has no output buffer amplifier, thereby significantly
reducing dc offset errors occurring at the output and making
the device highly compatible with high input impedance ADCs.
Requiring only 160 μA of power supply current, the AD737 is
optimized for use in portable multimeters and other battery-
powered applications. In power-down mode, the standby supply
current in is typically 25 μA.
Rev. J
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.
Low Cost, Low Power,
True RMS-to-DC Converter
AD737
FUNCTIONAL BLOCK DIAGRAM
CC 8kΩ
8kΩ COM
CF
VIN
ABSOLUTE
VALUE
CIRCUIT
SQUARER
DIVIDER
OUTPUT
+VS
POWER
DOWN
BIAS
SECTION
Figure 1.
CAV
–VS
CAV
The AD737 has both high (1012 Ω) and low impedance input
options. The high-Z FET input connects high source impedance
input attenuators, and a low impedance (8 kΩ) input accepts
rms voltages of up to 0.9 V while operating from the minimum
power supply voltage of ±2.5 V. The two inputs can be used
either single-ended or differentially.
The AD737 achieves 1% of reading error bandwidth, exceeding
10 kHz for input amplitudes from 20 mV rms to 200 mV rms,
while consuming only 0.72 mW.
The AD737 is available in two performance grades. The AD737J
and AD737K grades operate over the commercial temperature
range of 0°C to 70°C. The AD737JR-5 is tested with supply
voltages of ±2.5 V dc. The AD737A grade operates over the
industrial temperature range of −40°C to +85°C. The AD737 is
available in two low cost, 8lead packages: PDIP and SOIC_N.
PRODUCT HIGHLIGHTS
1. Computes the average rectified, absolute, or true rms value
of a signal regardless of waveform.
2. Only one external component, an averaging capacitor, is
required for the AD737 to perform true rms measurement.
3. The standby power consumption of 125 μW makes the
AD737 suitable for battery-powered applications.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 ©1988–2015 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com
|
| |
 
Data Sheet
AD737
Parameter
Peak Transient Input
Input Resistance
Input Bias Current
Low-Z Input (Pin 1)
Signal Range
Continuous RMS Level
Peak Transient Input
Input Resistance
Maximum Continuous
Nondestructive
Input
Input Offset Voltage5
Over the Rated
Operating
Temperature
Range
vs. Supply
OUTPUT
CHARACTERISTICS
Output Voltage
Range
Output Resistance
FREQUENCY RESPONSE
High-Z Input (Pin 2)
1% Additional Error
3 dB Bandwidth
Low-Z Input (Pin 1)
1% Additional Error
3 dB Bandwidth
Test Conditions/
Comments
±VS = +2.5 V input
to Pin 1
±VS = +2.8 V/−3.2 V
±VS = ±5 V
±VS = ±16.5 V
±VS = ±5 V
±VS = +2.5 V
±VS = +2.8 V/−3.2 V
±VS = ±5 V to
±16.5 V
±VS = +2.5 V
±VS = +2.8 V/−3.2 V
±VS = ±5 V
±VS = ±16.5 V
All supply voltages
AC-coupled
VS = ±2.5 V to ±5 V
VS = ±5 V to ±16.5 V
No load, output is
negative with
respect to COM
±VS = +2.8 V/−3.2 V
±VS = ±5 V
±VS = ±16.5 V
±VS = ±2.5 V, input
to Pin 1
DC
VIN = 1 mV rms
VIN = 10 mV rms
VIN = 100 mV rms
VIN = 200 mV rms
VIN = 1 mV rms
VIN = 10 mV rms
VIN = 100 mV rms
VIN = 200 mV rms
VIN = 1 mV rms
VIN = 10 mV rms
VIN = 40 mV rms
VIN = 100 mV rms
VIN = 200 mV rms
VIN = 1 mV rms
VIN = 10 mV rms
VIN = 100 mV rms
VIN = 200 mV rms
AD737A, AD737J
Min Typ
Max
±0.9
±4.0
±2.7
1012
1
25
300
1
±1.7
±3.8
±11
6.4 8
9.6
±12
±3
8 30
80
50 150
−1.6 −1.7
−3.3 −3.4
−4 −5
6.4 8
9.6
1
6
37
33
5
55
170
190
1
6
90
90
5
55
350
460
AD737K
Min Typ
Max
±0.9
±4.0
1012
1
±2.7
25
300
1
±1.7
±3.8
±11
6.4 8
9.6
±12
±3
8 30
80
50 150
−1.6 −1.7
−3.3 −3.4
−4 −5
6.4 8
9.6
1
6
37
33
5
55
170
190
1
6
90
90
5
55
350
460
Min
±0.6
AD737J-5
Typ Max
1012
1
25
Unit
V
V
V
V
Ω
pA
±1.7
6.4 8
8
300 mV rms
mV rms
V rms
V
V
V
V
9.6 kΩ
±12 V p-p
±3 mV
30 μV/°C
80 μV/V
μV/V
V6
−1.1 –0.9
V6
V
V6
6.4 8
9.6 kΩ
1 kHz
6 kHz
37 kHz
33 kHz
5 kHz
55 kHz
170 kHz
190 kHz
1 kHz
6 kHz
25 kHz
90 kHz
90 kHz
5 kHz
55 kHz
350 kHz
460 kHz
Rev. J | Page 5 of 24
Preview 5 Page |
Part DetailsOn this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for AD737 electronic component. |
| Information | Total 24 Pages | |
| Link URL | [ Copy URL to Clipboard ] | |
| Download | [ AD737.PDF Datasheet ] | |
Share Link :
Electronic Components Distributor
|
An electronic components distributor is a company that sources, stocks, and sells electronic components to manufacturers, engineers, and hobbyists. |
| SparkFun Electronics | Allied Electronics | DigiKey Electronics | Arrow Electronics |
| Mouser Electronics | Adafruit | Newark | Chip One Stop |
Featured Datasheets
| Part Number | Description | MFRS |
| AD7302 | The function is 2.7 V to 5.5 V/ Parallel Input Dual Voltage Output 8-Bit DAC. Analog Devices | |
| AD7303 | The function is +2.7 V to +5.5 V/ Serial Input/ Dual Voltage Output 8-Bit DAC. Analog Devices | |
| AD7304 | The function is +3 V/+5 V/ Rail-to-Rail Quad/ 8-Bit DAC. Analog Devices | |
Semiconductors commonly used in industry:
1N4148 |
BAW56 |
1N5400 |
NE555 | | ||
Quick jump to:
AD73
1N4
2N2
2SA
2SC
74H
BC
HCF
IRF
KA | ||