ade7752a Analog Devices, Inc., ade7752a Datasheet
ade7752a
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ade7752a Summary of contents
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... No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners. Polyphase Energy Metering IC ADE7752A are the same. Both products are referred to in the text of this data sheet as ADE7752. The part specifications surpass the accuracy requirements as quoted in the IEC62053-2x standard ...
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... Current Channels ....................................................................... 14 Voltage Channels ........................................................................ 14 Typical Connection Diagrams ...................................................... 15 Current Channel Connection ................................................... 15 REVISION HISTORY 7/05—Rev Rev. C Added ADE7752A.............................................................. Universal Changed NEGP Pin Name to REVP................................ Universal Changes to Table 1.............................................................................3 Changes to Table 6, Table 7 ............................................................21 Changes to Table 8, Table 9, Table 10............................................22 Updated Outline Dimensions ........................................................24 Changes to Ordering Guide ...........................................................24 9/03— ...
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... Rev Page ADE7752/ADE7752A –40°C to +85°C, unless otherwise noted. MAX Unit Conditions % Reading Voltage channel with full-scale signal (±500 mV), 25°C, over a dynamic range of 500 to 1 Degrees Degrees SCF = Reading 100 mV rms, ...
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... ADE7752/ADE7752A TIMING CHARACTERISTICS ± 5%, AGND = DGND = 0 V, on-chip reference, CLKIN = 10 MHz Table 2. Parameter Conditions and F2 Pulse Width (Logic High Output Pulse Period. See the Transfer Function section Time between F1 Falling Edge and F2 Falling Edge Pulse Width (Logic High). ...
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... −0 0 −0 0 −0 0 −40°C to +85°C −65°C to +150°C 150° 250°C/W 215°C 220°C Rev Page ADE7752/ADE7752A ...
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... CF. Table 7 shows how the calibration frequencies are selected DGND REVP 4 21 ADE7752/ CLKOUT IAP 5 20 ADE7752A CLKIN IAN 6 19 TOP VIEW (Not to Scale) IBP SCF 7 18 IBN ABS 8 17 VAP ICP 9 16 ICN 10 VBP 15 VCP ...
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... This offers the designer greater flexibility when designing the energy meter. See the Selecting a Frequency for an Energy Meter Application section. 24, 23 F1, F2 Low Frequency Logic Outputs. F1 and F2 supply average real power information. The logic outputs can be used to drive electromechanical counters and two-phase stepper motors directly. See the Transfer Function section. Rev Page ADE7752/ADE7752A ...
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... ADE7752/ADE7752A TYPICAL PERFORMANCE CHARACTERISTICS 0.5 WYE CONNECTION ON-CHIP REFERENCE 0.4 0.3 PHASE C 0.2 0.1 PHASE B 0 –0.1 –0.2 –0.3 –0.4 –0.5 0.1 1 CURRENT CHANNEL (% of Full Scale) Figure 4. Error as a Percent of Reading with Internal Reference (Wye Connection) 1.0 WYE CONNECTION ON-CHIP REFERENCE 0.8 0.6 +85° +0.5 0.4 0.2 0 –0.2 –0.4 –0.6 –0.8 –1.0 ...
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... Figure 12. Channel 1 Offset Distribution 0.5 WYE CONNECTION ON-CHIP REFERENCE 0.4 0.3 4.75V 0.2 0.1 0 –0.1 –0.2 –0.3 –0.4 –0.5 0.1 100 CURRENT CHANNEL (% of Full Scale) Figure 13. Error as a Percent of Reading over Power Supply with Internal Reference (Wye Connection) Rev Page ADE7752/ADE7752A – CH_I PhA OFFSET (mV 100 ...
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... ADE7752/ADE7752A TEST CIRCUIT 1MΩ 220V 1kΩ 100nF 10μ LOAD ABS DD 1kΩ IAP ADE7752/ 33nF RB ADE7752A 1kΩ IAN 33nF CLKOUT 20 IBP 7 SAME AS IAP, IAN CLKIN 19 8 IBN S0 21 ICP 9 SAME AS IAP, IAN 22 S1 ICN 10 SCF 18 16 ...
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... The difference is expressed as a percentage of the ideal frequency. The ideal frequency is obtained from the ADE7752 transfer function. See the Transfer Figure 24 and Function Rev Page ADE7752/ADE7752A section. ...
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... ADE7752/ADE7752A THEORY OF OPERATION The six voltage signals from the current and voltage transducers are digitized with ADCs. These ADCs are 16-bit second-order ∑-Δ with an oversampling rate of 833 kHz. This analog input structure greatly simplifies transducer interface by providing a wide dynamic range for direct connection to the transducer and also by simplifying the antialiasing filter design ...
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... Therefore, the harmonic real power must also correctly account for power factor since it is made series of pure sinusoids. ) α (1) n Note that the input bandwidth of the analog inputs is 14 kHz with a master clock frequency of 10 MHz. Rev Page ADE7752/ADE7752A ( ) ∞ ∑ × × ...
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... ADE7752/ADE7752A ANALOG INPUTS CURRENT CHANNELS The voltage outputs from the current transducers are connected to the ADE7752 current channels, which are fully differential voltage inputs. IAP, IBP, and ICP are the positive inputs for IAN, IBN, and ICN, respectively. The maximum peak differential signal on the current channel should be less than ± ...
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... As shown in Equation 7, in the ADE7752, the real power calcu- lation per phase is made when current and voltage inputs of one phase are connected to the same channel ( C). Then the summation of each individual real power calculation gives the total real power information, P( Rev Page ADE7752/ADE7752A ( ) ( ) = × × ...
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... ADE7752/ADE7752A Figure 21 shows the connections of the analog inputs of the ADE7752 with the power lines in a 3-phase 3-wire delta service. Note that only two current inputs and two voltage inputs of the ADE7752 are used in this case. The real power calculated by the ADE7752 does not depend on the selected channels. ...
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... This ensures correct active harmonic power calculation even at low power factors INACTIVE Figure 25. Effect of Channel Offset on the Real Power Calculation 0.010 0.008 0.006 0.004 0.002 –0.002 –0.004 700 800 900 1000 Rev Page ADE7752/ADE7752A } { } ( ) ( ) + × cos t ω cos t ω × ...
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... ADE7752/ADE7752A DIGITAL-TO-FREQUENCY CONVERSION After multiplication, the digital output of the low-pass filter contains the real power information of each phase. Because this LPF is not an ideal brick wall filter implementation, however, the output signal also contains attenuated components at the line frequency and its harmonics (cos(hωt), where and so on) ...
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... With an integration period of 2 seconds, only about 20 pulses are counted. The possibility of missing one pulse always exists since the ADE7752 output frequency is running asynchro- nously to the MCU timer. This would result in a 1-in- error in the power measurement. Rev Page ADE7752/ADE7752A ...
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... ADE7752/ADE7752A TRANSFER FUNCTION FREQUENCY OUTPUTS F1 AND F2 The ADE7752 calculates the product of six voltage signals (on current channel and voltage channel) and then low-pass filters this product to extract real power information. This real power information is then converted to a frequency. The frequency information is output on F1 and F2 in the form of active high pulses. The pulse rate at these outputs is relatively low, such as 29.32 Hz maximum for ac signals with SCF = 1 ...
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... CF output is much more responsive to power fluctuations. See Figure 15. Table 7. Maximum Output Frequency on CF SCF peak ac V rms 139 Hz 2 Rev Page ADE7752/ADE7752A Max Frequency for Max Frequency for Inputs (Hz) DC Inputs (Hz 0.51 1. 0.48 0. 2.04 4. 1.91 3. 7.67 15.35 ...
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... ADE7752/ADE7752A SELECTING A FREQUENCY FOR AN ENERGY METER APPLICATION As shown in Table 5, the user can select one of seven frequen- cies. This frequency selection determines the maximum frequency on F1 and F2. These outputs are intended to be used to drive the energy register (electromechanical or other). Since only seven different output frequencies can be selected, ...
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... REVP pin output stays high until all the phases measure positive power phase has gone below the no load threshold, REVP detection on this phase is disabled. REVP detection on this phase resumes when the power returns out of no load condition. See the No Load Threshold section. Rev Page ADE7752/ADE7752A ...
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... ADE7752AR -40° 85°C ADE7752ARRL -40° 85°C 1 ADE7752ARZ -40° 85°C 1 ADE7752ARZ-RL -40° 85°C ADE7752AAR -40° 85°C ADE7752AAR-RL -40° 85°C 1 ADE7752AARZ -40° 85°C 1 ADE7752AARZ-RL -40° 85°C EVAL-ADE7752EB EVAL-ADE7752AEB Pb-free part. © 2005 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective companies ...