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ADE7752AR bảng dữ liệu(PDF) 4 Page - Analog Devices |
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4 / 10 page REV. PrB 08/01 PRELIMINARY TECHNICAL DATA ADE7752 –4– ABSOLUTE MAXIMUM RATINGS* (TA = +25°C unless otherwise noted) VDD to AGND . . . . . . . . . . . . . . . . . . . . . . –0.3 V to +7 V VDD to DGND . . . . . . . . . . . . . . . . . . . . . . –0.3 V to +7 V Analog Input Voltage to AGND VAP, VBP, VCP, VN, IAP, IAN, . . . . . . . . . . . . . . . . . . IBP, IBN, ICP and ICN . . . . . . . . . . . . . –6 V to +6 V Reference Input Voltage to AGND –0.3 V to VDD + 0.3 V Digital Input Voltage to DGND . –0.3 V to VDD + 0.3 V Digital Output Voltage to DGND –0.3 V to VDD + 0.3 V Operating Temperature Range Industrial . . . . . . . . . . . . . . . . . . . . . . . –40°C to +85°C Storage Temperature Range . . . . . . . . –65°C to +150°C Junction Temperature . . . . . . . . . . . . . . . . . . . . . . +150°C CAUTION ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection. Although the ADE7752 features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of functionality. WARNING! ESD SENSITIVE DEVICE 24-Lead SOIC, Power Dissipation . . . . . . . . . TBD mW θ JA Thermal Impedance . . . . . . . . . . . . . . . . . . 250 °C/W Lead Temperature, Soldering Vapor Phase (60 sec) . . . . . . . . . . . . . . . . . . . +215°C Infrared (15 sec) . . . . . . . . . . . . . . . . . . . . . . +220°C *Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only; functional operation of the device at these or any other conditions above those listed in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. TERMINOLOGY MEASUREMENT ERROR The error associated with the energy measurement made by the ADE7752 is defined by the following formula: % 100 Energy True – ADE7752 the by Registered Energy × = Energy True Error Percentage PHASE ERROR BETWEEN CHANNELS The HPF (High Pass Filter) in the current channel has a phase lead response. To offset this phase response and equalize the phase response between channels a phase correc- tion network is also placed in the current channel. The phase correction network ensures a phase match between the current channels and voltage channels to within ±0.1° over a range of 45Hz to 65Hz and ±0.2° over a range 40Hz to 1kHz. This phase mismatch between the voltage and the current channels can be further reduced with the phase calibration register in each phase. See Figures 18 and 19. POWER SUPPLY REJECTION This quantifies the ADE7752 measurement error as a per- centage of reading when the power supplies are varied. For the ac PSR measurement a reading at nominal supplies (5 V) is taken. A 200 mV rms/100 Hz signal is then introduced onto the supplies and a second reading obtained under the same input signal levels. Any error introduced is expressed as a percentage of reading—see Measurement Error definition. For the dc PSR measurement a reading at nominal supplies (5 V) is taken. The supply is then varied ±5% and a second reading is obtained with the same input signal levels. Any error introduced is again expressed as a percentage of reading. ADC OFFSET ERROR This refers to the dc offset associated with the analog inputs to the ADCs. It means that with the analog inputs connected to AGND the ADCs still see an analog input signal of 1 mV to 10 mV, depending on gain setting. However, as the HPF is always present, the offset is removed from the current channel and the power calculation is not affected by this offset. GAIN ERROR The gain error of the ADE7752 is defined as the difference between the measured output frequency (minus the offset) and the ideal output frequency. The difference is expressed as a percentage of the ideal frequency. The ideal frequency is obtained from the ADE7752 transfer function—see Transfer Function section. |
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