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| 型號： | AD636KHZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 1/17頁 |
| 文件大小： | 670K |
| 描述： | IC CONV TRUE RMS/DC TO-100-10 |
| 產(chǎn)品培訓(xùn)模塊： | Introduction to Analog RMS-to-DC Technology: Converters and Applications |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 電流 - 電源： | 800µA |
| 電源電壓： | ±2.5 V ~ 16 V |
| 安裝類型： | 通孔 |
| 封裝/外殼： | TO-100-10 金屬罐 |
| 供應(yīng)商設(shè)備封裝： | TO-100-10 |
| 包裝： | 管件 |
Low Level, True RMS-to-DC Converter
Data Sheet
AD636
Rev. E
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.
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 ?013 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com
FEATURES
True rms-to-dc conversion
200 mV full scale
Laser-trimmed to high accuracy
0.5% maximum error (AD636K)
1.0% maximum error (AD636J)
Wide response capability
Computes rms of ac and dc signals
1 MHz, 3 dB bandwidth: V rms > 100 mV
Signal crest factor of 6 for 0.5% error
dB output with 50 dB range
Low power: 800 糀 quiescent current
Single or dual supply operation
Monolithic integrated circuit
Low cost
GENERAL DESCRIPTION
The AD636 is a low power monolithic IC that performs true
rms-to-dc conversion on low level signals. It offers performance
that is comparable or superior to that of hybrid and modular
converters costing much more. The AD636 is specified for a
signal range of 0 mV to 200 mV rms. Crest factors up to 6 can
be accommodated with less than 0.5% additional error, allowing
accurate measurement of complex input waveforms.
The low power supply current requirement of the AD636,
typically 800 糀, is ideal for battery-powered portable
instruments. It operates from a wide range of dual and single
power supplies, from ?.5 V to ?6.5 V or from +5 V to +24 V.
The input and output terminals are fully protected; the input
signal can exceed the power supply with no damage to the device
(allowing the presence of input signals in the absence of supply
voltage), and the output buffer amplifier is short-circuit protected.
The AD636 includes an auxiliary dB output derived from an
internal circuit point that represents the logarithm of the rms
output. The 0 dB reference level is set by an externally supplied
current and can be selected to correspond to any input level from
0 dBm (774.6 mV) to 20 dBm (77.46 mV). Frequency response
ranges from 1.2 MHz at 0 dBm to greater than 10 kHz at 50 dBm.
The AD636 is easy to use. The device is factory-trimmed at the
wafer level for input and output offset, positive and negative
waveform symmetry (dc reversal error), and full-scale accuracy
at 200 mV rms. Therefore, no external trims are required to
achieve full-rated accuracy.
FUNCTIONAL BLOCK DIAGRAM
R
L
dB
BUFFER IN
BUFFER OUT
I
OUT
10k&
10k&
40k&
+V
S
+V
S
+V
S
V
S
C
AV
V
IN
COM
CURRENT
MIRROR
SQUARER
DIVIDER
ABSOLUTE
VALUE
AD636
V
S
BUF
Figure 1.
The AD636 is available in two accuracy grades. The total error of the
J-version is typically less than ?.5 mV ?1.0% of reading, while
the total error of the AD636K is less than ?.2 mV to ?.5% of
reading. Both versions are temperature rated for operation
between 0癈 and 70癈 and available in 14-lead SBDIP and 10-lead
TO-100 metal can.
The AD636 computes the true root-mean-square of a complex ac
(or ac plus dc) input signal and gives an equivalent dc output level.
The true rms value of a waveform is a more useful quantity than
the average rectified value because it is a measure of the power
in the signal. The rms value of an ac-coupled signal is also its
standard deviation.
The 200 mV full-scale range of the AD636 is compatible with
many popular display-oriented ADCs. The low power supply
current requirement permits use in battery-powered hand-held
instruments. An averaging capacitor is the only external
component required to perform measurements to the fully
specified accuracy is. Its value optimizes the trade-off between
low frequency accuracy, ripple, and settling time.
An optional on-chip amplifier acts as a buffer for the input or the
output signals. Used in the input, it provides accurate
performance from standard 10 M?input attenuators. As an
output buffer, it sources up to 5 mA.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD636KN | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:RMS-to-DC Converter |
| AD636KQ | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:RMS-to-DC Converter |
| AD637 | 制造商:AD 制造商全稱:Analog Devices 功能描述:High Precision, Wide-Band RMS-to-DC Converter |
| AD637A | 制造商:AD 制造商全稱:Analog Devices 功能描述:High Precision, Wide-Band RMS-to-DC Converter |
| AD637AQ | 功能描述:IC RMS/DC CONV PRECISION 14-CDIP 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 |
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