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參數資料
| 型號： | 5962-8963701CX |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 模擬專用變換器 |
| 英文描述： | RMS TO DC CONVERTER, 0.15 MHz, CDIP14 |
| 封裝： | CERDIP-14 |
| 文件頁數： | 20/20頁 |
| 文件大小： | 515K |
| 代理商： | 5962-8963701CX |
AD637
Rev. G | Page 9 of 20
STANDARD CONNECTION
The AD637 is simple to connect for a majority of rms
measurements. In the standard rms connection shown in
Figure 5, only a single external capacitor is required to set the
averaging time constant. In this configuration, the AD637
computes the true rms of any input signal. An averaging error,
the magnitude of which is dependent on the value of the
averaging capacitor, is present at low frequencies. For example,
if the filter capacitor, CAV, is 4 F, the error is 0.1% at 10 Hz and
increases to 1% at 3 Hz. To measure ac signals, the AD637 can
be ac-coupled through the addition of a nonpolar capacitor in
series with the input, as shown in Figure 5.
1
25k
DEN
IN
BUF IN
BUFFER
OUT
SQUARER/
DIVIDER
–VS
CS
DB OUT
3COM
BIAS
2NC
4
OUT
OFF
4.7k
+VS
5
25k
6
7
8
9
10
+VS
11
12
NC
13
14
NC
VIN
VOUT =VIN2
(OPTIONAL)
CAV
+
AD637
ABSOLUTE
VALUE
00788-005
–VS
+VS
CAV
VIN
Figure 5. Standard RMS Connection
The performance of the AD637 is tolerant of minor variations
in the power supply voltages; however, if the supplies used
exhibit a considerable amount of high frequency ripple, it is
advisable to bypass both supplies to ground through a 0.1 F
ceramic disc capacitor placed as close to the device as possible.
The output signal range of the AD637 is a function of the
supply voltages, as shown in Figure 6. The output signal can be
used buffered or nonbuffered, depending on the characteristics
of the load. If no buffer is needed, tie the buffer input (Pin 1) to
common. The output of the AD637 is capable of driving 5mA
into a 2 k load without degrading the accuracy of the device.
SUPPLY VOLTAGE – DUAL SUPPLY (V)
20
15
0
±18
±5
MAX
V
OU
T
(V
olt
s
2k
Load)
±10
10
5
±15
±3
00788-006
Figure 6. AD637 Maximum VOUT vs. Supply Voltage
CHIP SELECT
The AD637 includes a chip select feature that allows the user to
decrease the quiescent current of the device from 2.2 mA to
350 A. This is done by driving the CS, Pin 5, to below 0.2 V dc.
Under these conditions, the output goes into a high impedance
state. In addition to lowering power consumption, this feature
permits bussing the outputs of a number of AD637s to form a
wide bandwidth rms multiplexer. If the chip select is not being
used, Pin 5 should be tied high.
OPTIONAL TRIMS FOR HIGH ACCURACY
The AD637 includes provisions for trimming out output offset
and scale factor errors resulting in significant reduction in the
maximum total error, as shown in Figure 7. The residual error is
due to a nontrimmable input offset in the absolute value circuit
and the irreducible nonlinearity of the device.
Referring to Figure 8, the trimming process follows:
Offset trim: Ground the input signal, V
IN
, and adjust R1
to give 0 V output from Pin 9. Alternatively, R1 can be
adjusted to give the correct output with the lowest expected
value of VIN.
Scale factor trim: Resistor R4 is inserted in series with
the input to lower the range of the scale factor. Connect
the desired full-scale input to VIN, using either a dc or a
calibrated ac signal, and trim R3 to give the correct output
at Pin 9, that is, 1 V dc should give l.000 V dc output. Of
course, a 2 V p-p sine wave should give 0.707 V dc output.
Remaining errors are due to the nonlinearity.
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相關代理商/技術參數 |
參數描述 |
|---|---|
| 5962-89640012A | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| 5962-89641012A | 制造商:Analog Devices 功能描述:OP Amp Single GP ±18V 20-Pin LCC 制造商:Analog Devices 功能描述:OP AMP SGL GP 18V 20PIN LCC - Rail/Tube 制造商:Analog Devices Inc. 功能描述:Precision Amplifiers FAST SETTLING HS IC |
| 5962-8964101CA | 制造商:Analog Devices 功能描述:OP Amp Single GP ±18V 12-Pin TO-8 制造商:Rochester Electronics LLC 功能描述:FAST SETTLING H.S. OP AMP - Bulk |
| 5962-89642012A | 功能描述:運算放大器 - 運放 HIGH OUTPUT CURRENT IC RoHS:否 制造商:Texas Instruments 通道數量:1 共模抑制比（最小值）:120 dB 輸入補償電壓:6 V 輸入偏流（最大值）:1400 pA 工作電源電壓:4 V to 36 V 安裝風格:SMD/SMT 封裝 / 箱體:SOT-23-5 轉換速度:0.8 V / us 關閉:No 輸出電流: 最大工作溫度:+ 125 C 封裝:Reel |
| 59628964201CA | 制造商:AD 功能描述:5962-8964201CA |
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