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ES7 数据表(PDF) 8 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) 8 Page - Cyrustek corporation

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09/07/08
8
ES7
True RMS-to-DC Converters
Application notes
1. AC-coupled operation
Refer to the standard circuit of ES7 shown in Figure 2~3. ES7 will work in an
AC-coupled operation when the SW1 is opened. In AC-coupled operation, an
AC-coupled capacitor (Ccp) and bias resistors Rin must be required. For a low
frequency input under 100Hz, the Ccp need a 1uF or even larger capacitor to prevent
input signal from decaying.
Due to the architecture of ES7, a bias current is needed to activate the input buffer. The
resistor Rin applied from Vin to GND supplies a bias current flow path in AC-coupled
operation. The bias current flows from GND to Vin through Rin will cause a bias
voltage at Vin pin. So the Rin resistance should not be too large (cause an additional
zero offset) or too small (low input impedance).
2. Power Down Function
The ES7 provides a power-down enable pin (Pin 3). To enable the device, this pin must
be connected to –Vs or keep floating. If it is connected to V+, the device will enter
power-down mode.
3. Post Filter CF
To reduce the output ripple of ES7, a post filter capacitor CF is required. This capacitor
should be connected as shown in figure 2. With post filter, the value of Cav should be
just large enough to give the maximum dc error at the lowest frequency of interest. And
the output ripple will be removed by the post filter.


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