- 您现在的位置：买卖IC网 > PDF目录22174 > AD637SD (Analog Devices Inc)IC RMS/DC CONV PRECISION 14-CDIP PDF资料下载
参数资料
| 型号： | AD637SD |
| 厂商： | Analog Devices Inc |
| 文件页数： | 8/21页 |
| 文件大小： | 0K |
| 描述： | IC RMS/DC CONV PRECISION 14-CDIP |
| 产品培训模块： | Introduction to Analog RMS-to-DC Technology: Converters and Applications |
| 标准包装： | 1 |
| 电流 - 电源： | 2.2mA |
| 电源电压： | ±3 V ~ 18 V |
| 安装类型： | 通孔 |
| 封装/外壳： | 14-CDIP（0.300"，7.62mm） |
| 供应商设备封装： | 14-CDIP |
| 包装： | 管件 |
| 配用： | AD637-EVALZ-ND - BOARD EVALUATION FOR AD637 |
AD637
FUNCTIONAL DESCRIPTION
FILTER/AMPLIFIER
BUFF IN
BUFF OUT 14
1
A5
BUFFER
AMPLIFIER
ONE QUADRANT
SQUARER/DIVIDER
I 4
24k ?
A4
8
11
9
C AV
+V S
RMS
OUT
24k ?
I 1
Q4
7
3
dB
OUTPUT
COMMON
ABSOLUTE VALUE VOLTAGE TO
CURRENT CONVERTER
6k ? 6k ?
A2
Q1
Q2
Q3
A3
Q5
I 3
BIAS
24k ?
5
6
4
CS
DEN
INPUT
OUTPUT
OFFSET
V IN 13
12k ?
A1
125 ?
AD637
Figure 4. Simplified Schematic
10
–V S
? V IN 2 ?
I 4 =
The AD637 embodies an implicit solution of the rms equation
that overcomes the inherent limitations of straightforward rms
computation. The actual computation performed by the AD637
follows the equation
V rms = Avg ? ?
? ? V rms ? ?
into four major sections: absolute value circuit (active rectifier),
squarer/divider, filter circuit, and buffer amplifier. The input
voltage (V IN ), which can be ac or dc, is converted to a unipolar
current I 1 by the active rectifiers A1 and A2. I 1 drives one input
of the squarer/divider, which has the transfer function
To compute the absolute value of the input signal, the averaging
capacitor is omitted. However, a small capacitance value at the
averaging capacitor pin is recommended to maintain stability;
5 pF is sufficient for this purpose. The circuit operates identically
to that of the rms configuration, except that I 3 is now equal to
I 4 , giving
I 1 2
I 4
I 4 = | I 1 |
The denominator current can also be supplied externally by
providing a reference voltage (V REF ) to Pin 6. The circuit operates
identically to the rms case, except that I 3 is now proportional to
I 1
I 4 = Avg
I 4 =
2
I 3
V REF . Therefore,
I 1 2
I 3
The output current of the squarer/divider I 4 drives A4, forming
a low-pass filter with the external averaging capacitor. If the RC
and
time constant of the filter is much greater than the longest period
of the input signal, then the A4 output is proportional to the
average of I 4 . The output of this filter amplifier is used by A3
V OUT =
V IN 2
V DEN
to provide the denominator current I 3 , which equals Avg I 4 and
This is the mean square of the input signal.
I 4 = Avg ? 1 ? = I 1 rms
is returned to the squarer/divider to complete the implicit rms
computation
? I 2 ?
? I 4 ?
and
V OUT = V IN rms
Rev. K | Page 7 of 20
相关PDF资料 |
PDF描述 |
|---|---|
| F471K29Y5RN6TJ5R | CAP CER 470PF 1KV 10% RADIAL |
| VE-J1J-CX-F2 | CONVERTER MOD DC/DC 36V 75W |
| AD637KDZ | IC RMS/DC CONV PRECISION 14-CDIP |
| F331K29Y5RN6TJ5R | CAP CER 330PF 1KV 10% RADIAL |
| AD536AKD | IC TRUE RMS/DC CONV 14-CDIP |
相关代理商/技术参数 |
参数描述 |
|---|---|
| AD637SD/883B | 功能描述:数据转换 IC - 多种 RMS TO DC CONVERTER IC RoHS:否 制造商:Texas Instruments 转换器数量:1 分辨率:8 bit 工作电源电压:2.7 V to 5.5 V 功耗: 工作温度范围:- 40 C to + 85 C 封装 / 箱体:MSOP-10 封装:Reel |
| AD637SQ | 制造商:未知厂家 制造商全称:未知厂家 功能描述:RMS-to-DC Converter |
| AD637SQ/883B | 功能描述:数据转换 IC - 多种 RMS/DC CONVERTER IC RoHS:否 制造商:Texas Instruments 转换器数量:1 分辨率:8 bit 工作电源电压:2.7 V to 5.5 V 功耗: 工作温度范围:- 40 C to + 85 C 封装 / 箱体:MSOP-10 封装:Reel |
| AD639 | 制造商:AD 制造商全称:Analog Devices 功能描述:UNIVERSAL TRIGONOMETRIC FUNCTION CONVERTER |
| AD6392 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:4-CH MOTOR DRIVE IC |
发布紧急采购，3分钟左右您将得到回复。