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| 型号： | 5962-8963701CX |
| 厂商： | ANALOG DEVICES INC |
| 元件分类： | 模拟专用变换器 |
| 英文描述： | RMS TO DC CONVERTER, 0.15 MHz, CDIP14 |
| 封装： | CERDIP-14 |
| 文件页数： | 1/20页 |
| 文件大小： | 515K |
| 代理商： | 5962-8963701CX |
High Precision, Wideband
RMS-to-DC Converter
AD637
Rev. G
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.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
2005 Analog Devices, Inc. All rights reserved.
FEATURES
High accuracy
0.02% max nonlinearity, 0 V to 2 V rms input
0.10% additional error to crest factor of 3
Wide bandwidth
8 MHz at 2 V rms input
600 kHz at 100 mV rms
Computes
True rms
Square
Mean square
Absolute value
dB output (60 dB range)
Chip select/power-down feature allows
Analog three-state operation
Quiescent current reduction from 2.2 mA to 350 A
14-lead SBDIP, 14-lead low cost CERDIP, and 16-lead SOIC_W
FUNCTIONAL BLOCK DIAGRAM
VIN
25k
ABSOLUTE
VALUE
DENOMINATOR
IN
CAV
RMS OUT
25k
BUFFER
IN
BUFFER
OUT
SQUARER/
DIVIDER
BIAS
COM
CS
OUTPUT
OFFSET
00788-001
Figure 1. SBDIP (D-14) and CERDIP (Q-14) Packages
GENERAL DESCRIPTION
The AD637 is a complete high accuracy, monolithic rms-to-dc
converter that computes the true rms value of any complex
waveform. It offers performance that is unprecedented in
integrated circuit rms-to-dc converters and comparable to
discrete and modular techniques in accuracy, bandwidth, and
dynamic range. A crest factor compensation scheme in the
AD637 permits measurements of signals with crest factors of up
to 10 with less than 1% additional error. The circuit’s wide
bandwidth permits the measurement of signals up to 600 kHz
with inputs of 200 mV rms and up to 8 MHz when the input
levels are above 1 V rms.
As with previous monolithic rms converters from ADI, the
AD637 has an auxiliary dB output available to the user. The
logarithm of the rms output signal is brought out to a separate
pin, allowing direct dB measurement with a useful range of 60
dB. An externally programmed reference current allows the
user to select the 0 dB reference voltage to correspond to any
level between 0.1 V and 2.0 V rms.
A chip select connection on the AD637 permits the user to
decrease the supply current from 2.2 mA to 350 A during periods
when the rms function is not in use. This feature facilitates the
addition of precision rms measurement to remote or hand-held
applications where minimum power consumption is critical. In
addition, when the AD637 is powered down, the output goes to a
high impedance state. This allows several AD637s to be tied
together to form a wideband true rms multiplexer.
The input circuitry of the AD637 is protected from overload
voltages that are in excess of the supply levels. The inputs are
not damaged by input signals if the supply voltages are lost.
The AD637 is available in Accuracy Grades J and K for
commercial temperature range (0°C to 70°C) applications;
Accuracy Grades A and B for industrial range (40°C to +85°C)
applications; and Accuracy Grade S rated over the 55°C to
+125°C temperature range. All versions are available in
hermetically sealed, 14-lead SBDIP, 14-lead CERDIP, and
16-lead SOIC packages.
The AD637 computes the true root-mean-square, mean-square,
or absolute value of any complex ac (or ac plus dc) input
waveform and gives an equivalent dc output voltage. The true
rms value of a waveform is more useful than an average
rectified signal since it relates directly to the power of the signal.
The rms value of a statistical signal is also related to the
standard deviation of the signal.
The AD637 is laser wafer trimmed to achieve rated
performance without external trimming. The only external
component required is a capacitor that sets the averaging time
period. The value of this capacitor also determines low
frequency accuracy, ripple level, and settling time.
The on-chip buffer amplifier can be used either as an input
buffer or in an active filter configuration. The filter can be used
to reduce the amount of ac ripple, thereby increasing accuracy.
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相关代理商/技术参数 |
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| 5962-89640012A | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| 5962-89641012A | 制造商:Analog Devices 功能描述:OP Amp Single GP ±18V 20-Pin LCC 制造商:Analog Devices 功能描述:OP AMP SGL GP 18V 20PIN LCC - Rail/Tube 制造商:Analog Devices Inc. 功能描述:Precision Amplifiers FAST SETTLING HS IC |
| 5962-8964101CA | 制造商:Analog Devices 功能描述:OP Amp Single GP ±18V 12-Pin TO-8 制造商:Rochester Electronics LLC 功能描述:FAST SETTLING H.S. OP AMP - Bulk |
| 5962-89642012A | 功能描述:运算放大器 - 运放 HIGH OUTPUT CURRENT IC RoHS:否 制造商:Texas Instruments 通道数量:1 共模抑制比（最小值）:120 dB 输入补偿电压:6 V 输入偏流（最大值）:1400 pA 工作电源电压:4 V to 36 V 安装风格:SMD/SMT 封装 / 箱体:SOT-23-5 转换速度:0.8 V / us 关闭:No 输出电流: 最大工作温度:+ 125 C 封装:Reel |
| 59628964201CA | 制造商:AD 功能描述:5962-8964201CA |
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