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ES7 数据表(PDF) 8 Page - Cyrustek corporation |
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ES7 数据表(HTML) 8 Page - Cyrustek corporation |
8 / 10 page 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. |
类似零件编号 - ES7 |
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类似说明 - ES7 |
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