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ES7 数据表(PDF) 7 Page - Cyrustek corporation

部件名 ES7
功能描述  True RMS-to-DC Converters
Download  10 Pages
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制造商  CYRUSTEK [Cyrustek corporation]
网页  http://www.cyrustek.com.tw
标志 CYRUSTEK - Cyrustek corporation

ES7 数据表(HTML) 7 Page - Cyrustek corporation

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09/07/08
7
ES7
True RMS-to-DC Converters
To Adjust the zero-offset of ES7 (Figure 3)
The output of some ES7 ICs may have an offset voltage when the input is zero. The
amount of this offset voltage might be different in every ES7. We provide pin1-RL to
achieve the reduction of zero offset voltage. The test circuit is shown as below. The
500kohm VR, 1kohm and 10ohm resistors are used to reduce zero offset voltage.
Adjusting the 500kohm VR can reduce the zero offset voltage. However it must be
noted that the 10ohm resistor enlarge the output impedance. The voltage of pin6-Vout is
equal to (output current)*(output impedance), so it would be enlarged too. This will
cause an additional error for ES7. So we recommend that the value of resistor between
pin1-RL and pin8-COM should not be too large.
CF (Optional)
1
2
3
4
5
6
7
8
RL
Vin
PwrDown
2
-Vs
Cav
Vout
COM
+Vs
SW1
1
Ccp
Rin
+
Absolute
Value
Square
Divider
Current
Mirror
Cav
+
-Vs
+Vs
Vout
4.7μ
2.2μ
4.7μ
47k
-Vs
500k
3
1k
10
Vin
Figure 3. Adjust the zero-offset
Note:
1. SW1 is opened for AC-coupled operation, or closed for direct input.
2. PwrDown pin is pulled to –Vs or keeps floating for normal operation. Connect it to
+Vs will force ES7 to enter power down mode.
3. The 500k ohm variable resistor can be used to adjust the zero-offset voltage.


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