ADE7757 Analog Devices, ADE7757 Datasheet
ADE7757
Available stocks
Related parts for ADE7757
ADE7757 Summary of contents
Page 1
... The ADE7757 includes a power supply monitoring circuit on the V mode until the supply voltage on V mately the supply falls below 4 V, the ADE7757 will also reset and the F1, F2 and CF outputs will be in their non-active modes. Internal phase matching circuitry ensures that the voltage and current channels are phase matched while the HPF in the current channel eliminates dc offsets ...
Page 2
PRELIMINARY TECHNICAL DATA 1, 2 ACCURACY 1 Measurement Error on Channel V1 1 Phase Error Between Channels V1 Phase Lead 37° (PF = 0.8 Capacitive) V1 Phase Lag 60° (PF = 0.5 Inductive Power Supply Rejection Output Frequency ...
Page 3
... The CF pulse is always 18 µs in the high frequency mode. See Frequency Outputs section and Table III. Specifications subject to change without notice ADE7757ARN EVAL-ADE7757EB REV. PrC and F2 Pulsewidth (Logic Low) sec Output Pulse Period. See Transfer Function Section sec Time Between F1 Falling Edge and F2 Falling Edge ...
Page 4
... The ideal frequency is obtained from the ADE7757 trans- fer function—see Transfer Function section. The gain error of the ADE7757 is defined as the differ- ence between the measured output frequency (minus the offset) and the ideal output frequency measured with a gain channel V1 ...
Page 5
... PRELIMINARY TECHNICAL DATA 1 V Power Supply. This pin provides the supply voltage for the circuitry in the ADE7757. The DD supply voltage should be maintained ± 5% for specified operation. This pin should be decoupled with a 10 µF capacitor in parallel with a ceramic 100 nF capacitor. 2,3 V2P, V2N Analog Inputs for Channel V2 (voltage channel). These inputs provide a fully differential input pair. The maximum differential input voltage is ± ...
Page 6
... PRELIMINARY TECHNICAL DATA TBD TBD TBD TBD TBD V DD VDD 602k V2P 150nF 220V 200 U1 ADE7757 200 V2N 150nF 40A TO RESERVED 40mA 200 V1P RCLKIN 150nF 500 200 V1N 150nF REF IN/OUT 100nF 1 F AGND DGND – 6 – 100nF ...
Page 7
PRELIMINARY TECHNICAL DATA TBD TBD REV. PrC. TBD – 7 – ...
Page 8
... 1+cos ( TIME The low frequency outputs (F1, F2) of the ADE7757 is generated by accumulating this real power information. This low frequency inherently means a long accumulation time between output pulses. Consequently, the resulting output frequency is proportional to the average real power. This average real power information is then accumulated (e ...
Page 9
... REV. PrC. ) and The output of the line voltage sensor is connected to the 1 ADE7757 at this analog input. Channel fully differen- tial voltage input with maximum peak differential signal of ±165 mV. Figure 14 illustrates the maximum signal levels that can be connected to the ADE7757 Channel V2. ...
Page 10
... The ADE7757 contains an on-chip power supply monitor. The power supply ( continuously monitored by the DD ADE7757. If the supply is less than 4 V, the ADE7757 will reset. This is useful to ensure proper device operation at power-up and power-down. The power supply monitor has built in hysteresis and filtering that provide a high degree of immunity to false triggering from noisy sup- plies ...
Page 11
... The average value of a sinusoidal signal is zero. Hence the frequency gener- ated by the ADE7757 is proportional to the average real power. Figure 21 shows the digital-to-frequency conver- sion for steady load conditions, i.e., constant voltage and current ...
Page 12
... ADE7757 output frequency is running asynchronously to the MCU timer. This would result in a one-in-twenty or 5% error in the power measurement. The ADE7757 calculates the product of two voltage signals (on Channel V1 and Channel V2) and then low-pass filters this product to extract real power information. This real power information is then converted to a frequency ...
Page 13
... The ADE7757 also includes a “no load threshold” and “start- up current” feature that will eliminate any creep effects in the meter. The ADE7757 is designed to issue a minimum output frequency. Any load generating a frequency lower than this minimum frequency will not cause a pulse to be issued on F1 ...
Page 14
PRELIMINARY TECHNICAL DATA Dimensions shown in inches and (mm). 16-Lead SOIC narrow-body 0.3937 (10.00) 0.3859 (9.80 0.1574 (4.00) 0.2440 (6.20) 0.1497 (3.80) 0.2284 (5.80 PIN 1 0.0688 (1.75) 0.050 (1.27) BSC 0.0532 (1.35) 0.0098 (0.25) 0.0192 ...