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参数资料
| 型号： | AD737JRZ-RL |
| 厂商： | Analog Devices Inc |
| 文件页数： | 15/24页 |
| 文件大小： | 0K |
| 描述： | IC CONV TRUE RMS-DC LP 8SOIC |
| 产品培训模块： | Introduction to Analog RMS-to-DC Technology: Converters and Applications |
| 标准包装： | 2,500 |
| 电流 - 电源： | 170µA |
| 电源电压： | 2.8V，-3.2V ~ ±16.5V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SO |
| 包装： | 带卷 (TR) |
| 配用： | AD737-EVALZ-ND - BOARD EVALUATION FOR AD737 |
R5 =
= 48.1 kΩ
6 V
DataSheet
Battery Operation
All the level-shifting for battery operation is provided by
the 3? digit converter, shown in Figure 27. Alternatively, an
external op amp adds flexibility by accommodating nonzero
common-mode voltages and providing output scaling and
offset to zero. When an external operational amplifier is used,
the output polarity is positive going.
Note that the combined input resistor value (R1 + R2 + 8 k?)
matches that of the R5 feedback resistor. In this instance, the
magnitudes of the output dc voltage and the rms of the ac input
are equal. R3 and R4 provide current to offset the output to 0 V.
Scaling the Output Voltage
The output voltage can be scaled to the input rms voltage. For
example, assume that the AD737 is retrofitted to an existing
application using an averaging responding circuit (full-wave
rectifier). The power supply is 12 V, the input voltage is 10 V
ac, and the desired output is 6 V dc.
For convenience, use the same combined input resistance as
shown in Figure 28. Calculate the rms input current as
AD737
Next, using the I OUTMAG value from Equation 2, calculate the new
feedback resistor value (R5) required for 6 V output using
(3)
125 μA
Select the closest-value standard 1% resistor, 47.5 k?.
Because the supply is 12 V, the common-mode voltage at the
R7/R8 divider is 6 V, and the combined resistor value
(R3 + R4) is equal to the feedback resistor, or 47.5 k?.
R2 is used to calibrate the transfer function (gain), and R4 sets
the output voltage to zero with no input voltage.
Perform calibration as follows:
1. With no ac input applied, adjust R4 for 0 V.
2. Apply a known input to the input.
3. Adjust the R2 trimmer until the input and output match.
The op amp selected for any single-supply application must be a
For higher voltages, a higher voltage part, such as an OP196,
can be used. When calibrating to 0 V, the specified voltage
above ground for the operational amplifier must be taken into
I INMAG =
10 V
69.8 kΩ + 2.5 kΩ + 8 kΩ
= 125 μ A = I OUTMAG
(2)
account. Adjust R4 slightly higher as appropriate.
Table 6. AD737 Capacitor Selection
Low Frequency
Maximum
Application
General-Purpose RMS
RMS Input Level
0 V to 1 V
Cutoff (?3 dB)
20 Hz
Crest Factor
5
C AV (μF)
150
C F (μF)
10
Settling Time 1 to 1%
360 ms
Computation
200 Hz
5
15
1
36 ms
0 mV to 200 mV
20 Hz
200 Hz
5
5
33
3.3
10
1
360 ms
36 ms
General-Purpose Average
0 V to 1 V
20 Hz
None
33
1.2 sec
Responding
200 Hz
None
3.3
120 ms
0 mV to 200 mV
20 Hz
200 Hz
None
None
33
3.3
1.2 sec
120 ms
SCR Waveform
0 mV to 200 mV
50 Hz
5
100
33
1.2 sec
Measurement
60 Hz
5
82
27
1.0 sec
0 mV to 100 mV
50 Hz
60 Hz
5
5
50
47
33
27
1.2 sec
1.0 sec
Audio Applications
Speech
Music
0 mV to 200 mV
0 mV to 100 mV
300 Hz
20 Hz
3
10
1.5
100
0.5
68
18 ms
2.4 sec
1
Settling time is specified over the stated rms input level with the input signal increasing from zero. Settling times are greater for decreasing amplitude input signals.
Rev. I | Page 15 of 24
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD737KN | 制造商:Rochester Electronics LLC 功能描述:RMS-DC CONVERTER IC - Bulk |
| AD737KR | 制造商:AD 制造商全称:Analog Devices 功能描述:Low Cost, Low Power, True RMS-to-DC Converter |
| AD737KR-REEL | 功能描述:IC TRUE RMS TO DC CONV 5V 8SOIC 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 |
| AD737KR-REEL7 | 功能描述:IC AC RMS TO DC CONV 5V 8-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 |
| AD737KRZ | 制造商:Analog Devices 功能描述:RMS to DC Converter -3.4V 210uA 190kHz/460kHz 8-Pin SOIC N 制造商:Rochester Electronics LLC 功能描述: |
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