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AD636 PDF预览

AD636

更新时间: 2024-01-31 03:25:54
品牌 Logo 应用领域
亚德诺 - ADI 转换器
页数 文件大小 规格书
8页 161K
描述
Low Level, True RMS-to-DC Converter

AD636 技术参数

是否Rohs认证: 不符合生命周期:Active
Reach Compliance Code:not_compliant风险等级:5.89
Is Samacsys:N转换器类型:RMS TO DC CONVERTER
JESD-30 代码:R-XDIP-T14JESD-609代码:e0
端子数量:14最高工作温度:70 °C
最低工作温度:封装主体材料:CERAMIC
封装代码:DIP封装等效代码:DIP14,.3
封装形状:RECTANGULAR封装形式:IN-LINE
电源:+-2.5/+-5 V子类别:Analog Special Function Converters
最大压摆率:1 mA表面贴装:NO
温度等级:COMMERCIAL端子面层:Tin/Lead (Sn/Pb)
端子形式:THROUGH-HOLE端子节距:2.54 mm
端子位置:DUALBase Number Matches:1

AD636 数据手册

 浏览型号AD636的Datasheet PDF文件第2页浏览型号AD636的Datasheet PDF文件第3页浏览型号AD636的Datasheet PDF文件第4页浏览型号AD636的Datasheet PDF文件第5页浏览型号AD636的Datasheet PDF文件第6页浏览型号AD636的Datasheet PDF文件第7页 
Low Level,  
a
True RMS-to-DC Converter  
AD636  
PIN CONNECTIONS &  
FEATURES  
True RMS-to-DC Conversion  
200 mV Full Scale  
FUNCTIONAL BLOCK DIAGRAM  
Laser-Trimmed to High Accuracy  
0.5% Max Error (AD636K)  
1.0% Max Error (AD636J)  
I
OUT  
BUF IN  
R
L
14  
13  
1
2
3
4
5
6
7
V
+V  
S
ABSOLUTE  
VALUE  
IN  
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 A Quiescent Current  
Single or Dual Supply Operation  
Monolithic Integrated Circuit  
Low Cost  
10k  
NC  
NC  
+
AD636  
BUF  
AD636  
BUF OUT  
COMMON  
12 NC  
SQUARER  
DIVIDER  
–V  
CURRENT  
MIRROR  
S
10k⍀  
11  
C
NC  
AV  
SQUARER  
DIVIDER  
CURRENT  
MIRROR  
10  
9
dB  
BUF OUT  
BUF IN  
COMMON  
dB  
+V  
S
R
I
L
ABSOLUTE  
VALUE  
+
10k⍀  
BUF  
8
OUT  
C
AV  
10k⍀  
V
IN  
–V  
S
NC = NO CONNECT  
Available in Chip Form  
PRODUCT DESCRIPTION  
The AD636 is a low power monolithic IC which performs true  
rms-to-dc conversion on low level signals. It offers performance  
which 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.  
is accurate within ±0.2 mV to ±0.3% of reading. Both versions  
are specified for the 0°C to +70°C temperature range, and are  
offered in either a hermetically sealed 14-pin DIP or a 10-lead  
TO-100 metal can. Chips are also available.  
PRODUCT HIGHLIGHTS  
1. The AD636 computes the true root-mean-square of a com-  
plex 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 since it is a  
measure of the power in the signal. The rms value of an  
ac-coupled signal is also its standard deviation.  
The low power supply current requirement of the AD636, typi-  
cally 800 µA, allows it to be used in battery-powered portable  
instruments. A wide range of power supplies can be used, from  
±2.5 V to ±16.5 V or a single +5 V to +24 V supply. 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.  
2. The 200 millivolt full-scale range of the AD636 is compatible  
with many popular display-oriented analog-to-digital con-  
verters. The low power supply current requirement permits  
use in battery powered hand-held instruments.  
The AD636 includes an auxiliary dB output. This signal is  
derived from an internal circuit point which represents the loga-  
rithm of the rms output. The 0 dB reference level is set by an  
externally supplied current and can be selected by the user  
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 a 0 dBm level to over 10 kHz at –50 dBm.  
3. The only external component required to perform measure-  
ments to the fully specified accuracy is the averaging capaci-  
tor. The value of this capacitor can be selected for the desired  
trade-off of low frequency accuracy, ripple, and settling time.  
4. The on-chip buffer amplifier can be used to buffer either the  
input or the output. Used as an input buffer, it provides  
accurate performance from standard 10 Minput attenua-  
tors. As an output buffer, it can supply up to 5 milliamps of  
output current.  
The AD636 is designed for ease of 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. Thus no external trims are re-  
quired to achieve full-rated accuracy.  
5. The AD636 will operate over a wide range of power supply  
voltages, including single +5 V to +24 V or split ±2.5 V to  
±16.5 V sources. A standard 9 V battery will provide several  
hundred hours of continuous operation.  
AD636 is available in two accuracy grades; the AD636J total  
error of ±0.5 mV ±0.06% of reading, and the AD636K  
REV. B  
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.  
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.  
Tel: 781/329-4700  
Fax: 781/326-8703  
World Wide Web Site: http://www.analog.com  
© Analog Devices, Inc., 1999  

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