ade7769 Analog Devices, Inc., ade7769 Datasheet
ade7769
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ade7769 Summary of contents
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... The ADE7769 includes a power supply monitoring circuit on the V supply voltage on V falls below 4 V, the ADE7769 also remains inactive and the F1, F2, and CF outputs are in their nonactive 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 ...
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... ADE7769 TABLE OF CONTENTS Specifications..................................................................................... 3 Timing Characteristics ................................................................ 4 Absolute Maximum Ratings............................................................ 5 ESD Caution.................................................................................. 5 Terminology ...................................................................................... 6 Pin Configuration and Function Descriptions............................. 7 Typical Performance Characteristics ............................................. 8 Functional Description .................................................................. 10 Theory of Operation .................................................................. 10 Analog Inputs.............................................................................. 11 Power Supply Monitor ............................................................... 12 REVISION HISTORY 8/05—Sp0 to Rev. A Internal Oscillator (OSC).......................................................... 14 Transfer Function....................................................................... 14 Selecting a Frequency for an Energy Meter Application ...... 15 No-Load Threshold ...
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... SOURCE 0.5 V max 4 V min I SOURCE 0.5 V max ±10 % ideal typ External 2.5 V reference 21.2 mV rms 116.7 mV rms Rev Page ADE7769 −40°C to +85°C, MIN MAX of 200 mV rms @ 100 ± 250 ± ± mA, V ...
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... ADE7769 Parameter POWER SUPPLY See the Terminology section for an explanation of specifications. 2 See the figures in the Typical Performance Characteristics section. 3 Sample tested during initial release and after any redesign or process change that may affect this parameter. TIMING CHARACTERISTICS ± 5%, AGND = DGND = 0 V, on-chip reference, RCLKIN = 6.2 kΩ, 0.5% ± 50 ppm/° unless otherwise noted ...
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... maximum rating conditions for extended periods may affect –0 0.3 V device reliability. DD –0 0 –0 0 –40°C to +85°C –65°C to +150°C 150°C 350 mW 124.9°C/W See J-STD-20 Rev Page ADE7769 ...
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... Frequency Output Error (CF) The frequency output error of the ADE7769 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 ADE7769 transfer function ...
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... AGND This pin provides the ground reference for the analog circuitry in the ADE7769, that is, the 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, current and voltage sensors, and so forth. ...
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... CURRENT CHANNEL (% of Full Scale) Figure 6. Error Reading over Temperature with On-Chip Reference (PF = 0.5 IND 100nF 602k V2P 150nF 200 ADE7769 CF 14 200 3 V2N 150nF 40mA REVP 12 200 6.2k 5 V1P + RCLKIN 11 150nF 350 200 V1N 4 150nF S0 ...
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... MEAN = 0% SDs = 1.55% MIN = –11.79% 800 MAX = +6.08% NO. OF POINTS = 3387 600 400 200 0 100 –10 –8 –6 Figure 14. Part-to-Part CF Deviation from Mean Rev Page ADE7769 EXTERNAL REFERENCE TEMPERATURE = CHANNEL V1 OFFSET (mV) EXTERNAL REFERENCE TEMPERATURE = 25 C –6 – ...
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... ADE7769 FUNCTIONAL DESCRIPTION THEORY OF OPERATION The two ADCs in the ADE7769 digitize the voltage signals from the current and voltage sensors. These ADCs are 16-bit Σ-Δs with an oversampling rate of 450 kHz. This analog input structure greatly simplifies sensor interfacing by providing a wide dynamic range for direct connection to the sensor and by simplifying the antialiasing filter design ...
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... This IC is ideal for low current meters. Figure 20 shows a typical connection for Channel V2. Typically, the ADE7769 is biased around the phase wire, and a resistor divider is used to provide a voltage signal that is proportional to V1P the line voltage ...
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... The ADE7769 contains an on-chip power supply monitor. The power supply ( continuously monitored by the ADE7769 the supply is less than 4 V, the ADE7769 becomes inactive. This is useful to ensure proper device operation at power-up and power-down. The power supply monitor has built-in hysteresis and filtering, which provide a high degree of immunity to false triggering from noisy supplies ...
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... Connecting to a Microcontroller for Energy Measurement The easiest way to interface the ADE7769 to a microcontroller is to use the CF high frequency output with the output frequency scaling set to 2048 × F1, F2. This is done by setting SCF = 0 and (see Table 7). With full-scale ac signals on the analog inputs, the output frequency approximately 2 ...
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... Figure 27. Effect of RCLKIN on Internal Oscillator Frequency (OSC) TRANSFER FUNCTION Frequency Outputs F1 and F2 The ADE7769 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. The frequency information is output on F1 and F2 in the form of active low pulses ...
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... V. In all MAX F1 and F2 (Hz) 0.076 0.153 0.244 0.367 0.489 0.733 Frequency on F1 and F2— F (Hz) CH1 and CH2 Half-Scale AC Input 1–4 0.86 0.044 Hz 0.051 × 1.72 0.051 × F 0.088 Hz 2 3.43 0.051 × F 0.176 Hz 3 6.86 0.051 × F 0.352 Hz 4 ADE7769 1 1 ...
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... Figure 28. NO-LOAD THRESHOLD NEGATIVE POWER INFORMATION The ADE7769 detects when the current and voltage channels have a phase shift greater than 90°. This mechanism can detect an incorrect meter connection or the generation of negative power. The REVP pin output goes active high when negative power is detected and active low if positive power is detected ...
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... REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN ORDERING GUIDE Model Temperature Range ADE7769AR −40°C to +85°C ADE7769AR-RL −40°C to +85°C 1 ADE7769ARZ −40°C to +85°C 1 ADE7769ARZ-RL −40°C to +85°C EVAL-ADE7769EB ADE7769AR-REF Pb-free part. 10.00 (0.3937) 9.80 (0.3858 6.20 (0.2441) 4.00 (0.1575) 5.80 (0.2283) 3.80 (0.1496 1.75 (0.0689) 1.27 (0.0500) BSC 1 ...
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... ADE7769 NOTES Rev Page ...
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... NOTES Rev Page ADE7769 ...
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... ADE7769 NOTES © 2005 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D05332–0–8/05(A) Rev Page ...