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| 型号： | AD637JR |
| 厂商： | Analog Devices Inc |
| 文件页数： | 13/21页 |
| 文件大小： | 0K |
| 描述： | IC TRUE RMS/DC CONV WDBND 16SOIC |
| 产品变化通告： | Product Discontinuance 27/Oct/2011 |
| 标准包装： | 1 |
| 电流 - 电源： | 2.2mA |
| 电源电压： | ±3 V ~ 18 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 |
| 配用： | AD637-EVALZ-ND - BOARD EVALUATION FOR AD637 |
AD637
AC MEASUREMENT ACCURACY AND CREST
FACTOR
Crest factor is often overlooked in determining the accuracy of
an ac measurement. Crest factor is defined as the ratio of the peak
signal amplitude to the rms value of the signal (CF = V P /V rms).
Most common waveforms, such as sine and triangle waves, have
relatively low crest factors (≤2). Waveforms that resemble low
duty cycle pulse trains, such as those occurring in switching
power supplies and SCR circuits, have high crest factors. For
example, a rectangular pulse train with a 1% duty cycle has
1.5
1.0
0.5
0
–0.5
–1.0
POSITIVE INPUT PULSE
C AV = 22μF
a crest factor of 10 (CF = 1 η ).
–1.5
0
Vp
T
e 0
η = DUTY CYCLE =
CF = 1/ η
100μs
T
1
2 3 4 5 6 7 8 9
CREST FACTOR
Figure 18. Additional Error vs. Crest Factor
10
11
100μs
e IN (RMS) = 1 V RMS
10
Figure 16. Duty Cycle Timing
C AV = 22μF
2.0
1.8
1.6
1.4
1.2
1
0.1
CF = 10
1.0
0.8
0.6
0.4
0.2
CF = 10
CF = 7
CF = 3
CF = 3
0
0
0.5
1.0
V IN (V RMS)
1.5
2.0
0.01
1
10
100
1000
Figure 19. Error vs. RMS Input Level for Three Common Crest Factors
PULSE WIDTH (μs)
Figure 17. AD637 Error vs. Pulse Width Rectangular Pulse
for a 1 V rms input signal with crest factors from 1 to 11.
A rectangular pulse train (pulse width 100 μs) is used for this
test because it is the worst-case waveform for rms measurement
(all the energy is contained in the peaks). The duty cycle and
peak amplitude were varied to produce crest factors from l to 10
while maintaining a constant 1 V rms input amplitude.
CONNECTION FOR dB OUTPUT
Another feature of the AD637 is the logarithmic, or decibel,
output. The internal circuit that computes dB works well over
a 60 dB range. Figure 20 shows the dB measurement connection.
The user selects the 0 dB level by setting R1 for the proper 0 dB
reference current, which is set to cancel the log output current
from the squarer/divider circuit at the desired 0 dB point. The
external op amp is used to provide a more convenient scale and to
allow compensation of the +0.33%/°C temperature drift of the
is available from Precision Resistor Co., Inc., in Largo, Fla.
(Model PT146). Consult its website for additional information.
Rev. K | Page 12 of 20
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD637JR-REEL | 功能描述:IC RMS/DC CONV PRECISION 16-SOIC RoHS:否 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 |
| AD637JR-REEL7 | 功能描述:IC RMS/DC CONV PRECISION 16-SOIC RoHS:否 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 |
| AD637JRZ | 功能描述:IC RMS/DC CONV PREC WB 16-SOIC 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 |
| AD637JRZ | 制造商:Analog Devices 功能描述:RMS to DC Converter (RMS/DC) IC 制造商:Analog Devices 功能描述:IC, RMS-DC CONV, 0.25%, 8MHZ, SOIC-16 |
| AD637JRZ-R7 | 功能描述:IC RMS/DC CONV PREC WB 16SOIC 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 |
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