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ES7 Scheda tecnica(PDF) 7 Page - Cyrustek corporation |
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ES7 Scheda tecnica(HTML) 7 Page - Cyrustek corporation |
7 / 10 page 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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