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| 型号： | AD737KR-REEL7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 1/24页 |
| 文件大小： | 0K |
| 描述： | IC AC RMS TO DC CONV 5V 8-SOIC |
| 产品培训模块： | Introduction to Analog RMS-to-DC Technology: Converters and Applications |
| 标准包装： | 1,000 |
| 电流 - 电源： | 170µA |
| 电源电压： | 2.8V，-3.2V ~ ±16.5V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SO |
| 包装： | 带卷 (TR) |
| 配用： | AD737-EVALZ-ND - BOARD EVALUATION FOR AD737 |
Low Cost, Low Power,
True RMS-to-DC Converter
Data Sheet
FEATURES
FUNCTIONAL BLOCK DIAGRAM
Computes
True rms value
Average rectified value
C C
8 k?
8 k?
COM
C F
Absolute value
Provides
V IN
ABSOLUTE
VALUE
CIRCUIT
SQUARER
DIVIDER
OUTPUT
200 mV full-scale input range (larger inputs with
C AV
input scaling)
Direct interfacing with 3? digit CMOS ADCs
High input impedance: 10 12 ?
+V S
POWER
DOWN
BIAS
SECTION
–V S
C AV
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 this converter 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 can compute the rms value of both ac and dc input
voltages. It can also be operated ac-coupled by adding one
external capacitor. In this mode, the AD737 can resolve input
signal levels of 100 μV rms or less, despite variations in tem-
perature 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 occurring at the output, which makes
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. I
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.
Trademarks and registered trademarks are the property of their respective owners.
Figure 1.
The AD737 has both high (10 12 ?) and low impedance input
options. The high-Z FET input connects high source impedance
input attenuators, and a low impedance (8 k?) input accepts
rms voltages 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 AD737isavailableintwoperformancegrades.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, 8-lead packages: PDIP and SOIC_N.
PRODUCT HIGHLIGHTS
1. Computes 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 www.analog.com
Fax: 781.461.3113 ?2012 Analog Devices, Inc. All rights reserved.
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| 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 类别:集成电路 (IC) >> PMIC - RMS 至 DC 转换器 系列:- 标准包装:46 系列:- 电流 - 电源:1.2mA 电源电压:±18 V，36 V 安装类型:表面贴装 封装/外壳:16-SOIC（0.295"，7.50mm 宽） 供应商设备封装:16-SOIC W 包装:管件 |
| AD737KRZ-RL | 功能描述:IC TRUE RMS/DC CONV LP 8SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - RMS 至 DC 转换器 系列:- 标准包装:46 系列:- 电流 - 电源:1.2mA 电源电压:±18 V，36 V 安装类型:表面贴装 封装/外壳:16-SOIC（0.295"，7.50mm 宽） 供应商设备封装:16-SOIC W 包装:管件 |
| AD7390 | 制造商:AD 制造商全称:Analog Devices 功能描述:+3 Volt Serial-Input Micropower 10-Bit & 12-Bit DACs |
| AD7390AN | 功能描述:IC DAC 12BIT SRL 3V 8-DIP RoHS:否 类别:集成电路 (IC) >> 数据采集 - 数模转换器 系列:- 标准包装:2,400 系列:- 设置时间:- 位数:18 数据接口:串行 转换器数目:3 电压电源:模拟和数字 功率耗散（最大）:- 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:36-TFBGA 供应商设备封装:36-TFBGA 包装:带卷 (TR) 输出数目和类型:* 采样率（每秒）:* |
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