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ADE7761ARS Arkusz danych(PDF) 9 Page - Analog Devices |
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ADE7761ARS Arkusz danych(HTML) 9 Page - Analog Devices |
9 / 28 page ADE7761 Rev. A | Page 9 of 28 PIN CONFIGURATION AND FUNCTION DESCRIPTIONS ADE7761 TOP VIEW (Not to Scale) REFIN/OUT 9 S0 12 SCF 10 S1 11 VDD 1 F1 20 V1A 2 F2 19 V1B 3 CF 18 V1N 4 DGND 17 V2N 5 REVP 16 V2P 6 FAULT 15 MISCAL 7 RCLKIN 14 AGND 8 INT 13 Figure 3. Pin Configuration (SSOP) Table 4. Pin Function Descriptions Pin No. Mnemonic Description 1 VDD Power Supply. This pin provides the supply voltage for the digital circuitry in the ADE7761. The supply voltage should be maintained at 5 V ± 5% for specified operation. This pin should be decoupled with a 10 µF capacitor in parallel with a ceramic 100 nF capacitor. 2, 3 V1A, V1B Analog Inputs for Channel 1 (Current Channel). These inputs are fully differential voltage inputs with maximum differential input signal levels of ±660 mV with respect to V1N for specified operation. The maximum signal level at these pins is ±1 V with respect to AGND. Both inputs have internal ESD protection circuitry, and an overvoltage of ±6 V can also be sustained on these inputs without risk of permanent damage. 4 V1N Negative Input Pin for Differential Voltage Inputs V1A and V1B. The maximum signal level at this pin is ±1 V with respect to AGND. The input has internal ESD protection circuitry, and an overvoltage of ±6 V can also be sustained on these inputs without risk of permanent damage. The input should be directly connected to the burden resistor and held at a fixed potential,that is, AGND. See the Analog Inputs section. 5 V2N Negative Input Pin for Differential Voltage Inputs V2P and MISCAL. The maximum signal level at this pin is ±1 V with respect to AGND. The input has internal ESD protection circuitry, and an overvoltage of ±6 V can also be sustained on these inputs without risk of permanent damage. The input should be held at a fixed potential, that is, AGND. See the Analog Inputs section. 6 V2P Analog Inputs for Channel 2 (Voltage Channel). This input is fully differential voltage input with maximum differential input signal levels of ±660 mV with respect to V2N for specified operation. The maximum signal level at these pins is ±1 V with respect to AGND. This input has internal ESD protection circuitry, and an overvoltage of ±6 V can also be sustained on these inputs without risk of permanent damage. 7 MISCAL Analog Input for Missing Neutral Calibration. This pin can be used to calibrate the CF-F1-F2 frequencies in the missing neutral condition. This input is fully differential voltage input with maximum differential input signal levels of +660 mV with respect to V2N for specified operation. The maximum signal level at this pin is ±1 V with respect to AGND. This input has internal ESD protection circuitry, and an overvoltage of ±6 V can also be sustained on these inputs without risk of permanent damage. 8 AGND This pin provides the ground reference for the analog circuitry in the ADE7761, that is, ADCs and reference. This pin should be tied to the analog ground plane of the PCB. The analog ground plane is the ground reference for all analog circuitry such as antialiasing filters, and current and voltage transducers. For good noise suppression, the analog ground plane should be connected only to the digital ground plane at the DGND pin. 9 REFIN/OUT This pin provides access to the on-chip voltage reference. The on-chip reference has a nominal value of 2.5 V ± 8% and a typical temperature coefficient of 30 ppm/°C. An external reference source can also be connected at this pin. In either case, this pin should be decoupled to AGND with a 1 μF ceramic capacitor and 100 nF ceramic capacitor. 10 SCF Select Calibration Frequency. This logic input is used to select the frequency on the calibration output CF. Table 6 shows how the calibration frequencies are selected. 11, 12 S1, S0 These logic inputs are used to select one of four possible frequencies for the digital-to-frequency conversion. This offers the designer greater flexibility when designing the energy meter. See the Selecting a Frequency for an Energy Meter Application section. |
Podobny numer części - ADE7761ARS |
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Podobny opis - ADE7761ARS |
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