Datasheet ADE7755 (Analog Devices)

Energy Metering IC with Pulse Output Data Sheet ADE7755 FEATURES GENERAL DESCRIPTION High accuracy, surpasses 50 Hz/60 Hz IEC 687/IEC 1036
The ADE7755 is a high accuracy electrical energy measurement
Less than 0.1% error over a dynamic range of 500 to 1
IC. The part specifications surpass the accuracy requirements
Supplies active power on the frequency outputs, F1 and F2
as quoted in the IEC 1036 standard.
High frequency output CF is intended for calibration and
The only analog circuitry used in the ADE7755 is in the ADCs
supplies instantaneous active power
and reference circuit. All other signal processing (for example,
Synchronous CF and F1/F2 outputs
multiplication and filtering) is carried out in the digital domain.
Logic output REVP provides information regarding the sign
This approach provides superior stability and accuracy over
of the active power
extremes in environmental conditions and over time.
Direct drive for electromechanical counters and 2-phase stepper motors (F1 and F2)
The ADE7755 supplies average active power information on
Programmable gain amplifier (PGA) in the current channel
the low frequency outputs, F1 and F2. These logic outputs can
facilitates usage of small shunts and burden resistors
be used to directly drive an electromechanical counter or interface
Proprietary ADCs and DSPs provide high accuracy over large
to an MCU. The CF logic output gives instantaneous active
variations in environmental conditions and time
power information. This output is intended to be used for
On-chip power supply monitoring
calibration purposes or for interfacing to an MCU.
On-chip creep protection (no load threshold)
The ADE7755 includes a power supply monitoring circuit on the
On-chip reference 2.5 V ± 8% (30 ppm/°C typical) with
AVDD supply pin. The ADE7755 remains in a reset condition until
external overdrive capability
the supply voltage on AVDD reaches 4 V. If the supply falls below
Single 5 V supply, low power (15 mW typical)
4 V, the ADE7755 resets and no pulse is issued on F1, F2, and CF.
Low cost CMOS process
Internal phase matching circuitry ensures that the voltage and current channels are phase matched whether the HPF in Channel 1 is on or off. An internal no load threshold ensures that the ADE7755 does not exhibit any creep when there is no load. The ADE7755 is available in a 24-lead SSOP package.
FUNCTIONAL BLOCK DIAGRAM G0 G1 AVDD AGND AC/DC DVDD DGND 16 15 3 11 2 1 21 ADE7755 POWER SUPPLY MONITOR SIGNAL PHASE PROCESSING CORRECTION BLOCK V1P 5 ...110101... ADC V1N 6 PGA HPF ×1, ×2, ×8, ×16 LPF MULTIPLIER V2P 8 ...11011001... ADC V2N 7 DIGITAL-TO-FREQUENCY 9 RESET CONVERTER 4kΩ 2.5V REFERENCE 10 17 18 12 14 13 20 22 24 23
01 0 6-
REF CLKIN CLKOUT SCF S0 S1 REVP CF F1 F2 IN/OUT
89 02 Figure 1. 1 U.S. Patents 5,745,323; 5,760,617; 5,862,069; and 5,872,469.
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Document Outline Features General Description Functional Block Diagram Revision History Specifications Timing Characteristics Absolute Maximum Ratings ESD Caution Pin Configuration and Function Descriptions Typical Performance Characteristics Terminology Theory of Operation Power Factor Considerations Nonsinusoidal Voltage and Current Analog Inputs Channel 1 (Current Channel) Channel 2 (Voltage Channel) Typical Connection Diagrams Power Supply Monitor HPF and Offset Effects Digital-to-Frequency Conversion Interfacing the ADE7755 to a Microcontroller for Energy Measurement Power Measurement Considerations Transfer Function Frequency Outputs F1 and F2 Example 1 Example 2 Frequency Output CF Selecting a Frequency for an Energy Meter Application Frequency Outputs No Load Threshold Outline Dimensions Ordering Guide