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參數(shù)資料
| 型號(hào)： | AD737KR-REEL |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 模擬專用變換器 |
| 英文描述： | Low Cost, Low Power, True RMS-to-DC Converter |
| 中文描述： | RMS TO DC CONVERTER, 0.005 MHz, PDSO8 |
| 封裝： | MS-012AA, SOIC-8 |
| 文件頁數(shù)： | 1/8頁 |
| 文件大小： | 149K |
| 代理商： | AD737KR-REEL |
REV. C
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
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
a
Low Cost, Low Power,
True RMS-to-DC Converter
AD737*
FUNCTIONAL BLOCK DIAGRAM
FULL
WAVE
RECTIFIER
INPUT
AMPLIFIER
RMS CORE
COM
+V
S
OUTPUT
C
AV
–V
S
POWER
DOWN
V
IN
C
C
8k
V
AD737
BIAS
SECTION
8k
V
8
7
6
5
1
2
3
4
FEATURES
COMPUTES
True RMS Value
Average Rectified Value
Absolute Value
PROVIDES
200 mV Full-Scale Input Range
(Larger Inputs with Input Attenuator)
Direct Interfacing with 3 1/2 Digit
CMOS A/D Converters
High Input Impedance of 10
12
V
Low Input Bias Current: 25 pA max
High Accuracy:
6
0.2 mV
6
0.3% of Reading
RMS Conversion with Signal Crest Factors Up to 5
Wide Power Supply Range: +2.8 V, –3.2 V to
6
16.5 V
Low Power: 160
m
A max Supply Current
No External Trims Needed for Specified Accuracy
AD736—A General Purpose, Buffered Voltage
Output Version Also Available
PRODUCT 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 this converter make it suitable for upgrading the per-
formance of non-rms “precision rectifiers” in many applications.
Compared to these circuits, the AD737 offers higher accuracy at
equal or lower cost.
The AD737 can compute the rms value of both ac and dc input
voltages. It can also be operated ac coupled by adding one ex-
ternal capacitor. In this mode, the AD737 can resolve input sig-
nal levels of 100
μ
V rms or less, despite variations in temperature
or supply voltage. High accuracy is also maintained for input
waveforms with crest factors of 1 to 3. In addition, crest factors
as high as 5 can be measured (while introducing only 2.5%
additional error) at the 200 mV full-scale input level.
The AD737 has no output buffer amplifier, thereby significantly
reducing dc offset errors occuring at the output. This allows the
device to be highly compatible with high input impedance A/D
converters.
Requiring only 160
μ
A of power supply current, the AD737 is
optimized for use in portable multimeters and other battery
powered applications. This converter also provides a “power
down” feature which reduces the power supply standby current
to less than 30
μ
A.
The AD737 allows the choice of two signal input terminals: a
high impedance (10
12
) FET input which will directly interface
with high Z input attenuators and a low impedance (8 k
) input
which allows the measurement of 300 mV input levels, while
operating from the minimum power supply voltage of +2.8 V,
–3.2 V. The two inputs may be used either singly or differentially.
The AD737 achieves a 1% of reading error bandwidth exceed-
ing 10 kHz for input amplitudes from 20 mV rms to 200 mV
rms while consuming only 0.72 mW.
The AD737 is available in four performance grades. The
AD737J and AD737K grades are rated over the commercial
temperature range of 0
°
C to +70
°
C. The AD737A and AD737B
grades are rated over the industrial temperature range of –40
°
C
to +85
°
C.
The AD737 is available in three low-cost, 8-lead packages: plas-
tic DIP, plastic SO and hermetic cerdip.
PRODUCT HIGHLIGHTS
1. The AD737 is capable of computing the average rectified
value, absolute value or true rms value of various input
signals.
2. Only one external component, an averaging capacitor, is
required for the AD737 to perform true rms measurement.
3. The low power consumption of 0.72 mW makes the AD737
suitable for many battery powered applications.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
World Wide Web Site: http://www.analog.com
Fax: 781/326-8703
Analog Devices, Inc., 1999
*
Protected under U.S. Patent Number 5,495,245.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD737KR-REEL7 | 功能描述:IC AC RMS TO DC CONV 5V 8-SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - RMS 至 DC 轉(zhuǎn)換器 系列:- 標(biāo)準(zhǔn)包裝:46 系列:- 電流 - 電源:1.2mA 電源電壓:±18 V，36 V 安裝類型:表面貼裝 封裝/外殼:16-SOIC（0.295"，7.50mm 寬） 供應(yīng)商設(shè)備封裝:16-SOIC W 包裝:管件 |
| AD737KRZ | 制造商:Analog Devices 功能描述:RMS to DC Converter -3.4V 210uA 190kHz/460kHz 8-Pin SOIC N 制造商:Rochester Electronics LLC 功能描述: |
| AD737KRZ-R7 | 功能描述:IC TRUE RMS/DC CONV LP 8SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - RMS 至 DC 轉(zhuǎn)換器 系列:- 標(biāo)準(zhǔn)包裝:46 系列:- 電流 - 電源:1.2mA 電源電壓:±18 V，36 V 安裝類型:表面貼裝 封裝/外殼:16-SOIC（0.295"，7.50mm 寬） 供應(yīng)商設(shè)備封裝:16-SOIC W 包裝:管件 |
| AD737KRZ-RL | 功能描述:IC TRUE RMS/DC CONV LP 8SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - RMS 至 DC 轉(zhuǎn)換器 系列:- 標(biāo)準(zhǔn)包裝:46 系列:- 電流 - 電源:1.2mA 電源電壓:±18 V，36 V 安裝類型:表面貼裝 封裝/外殼:16-SOIC（0.295"，7.50mm 寬） 供應(yīng)商設(shè)備封裝:16-SOIC W 包裝:管件 |
| AD7390 | 制造商:AD 制造商全稱:Analog Devices 功能描述:+3 Volt Serial-Input Micropower 10-Bit & 12-Bit DACs |
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