ADE7752B| Datasheet

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3-Phase, 3-Wire, and 4-Wire Energy Metering IC with Pulse Output ADE7752B
FEATURES
High accuracy supports 50 Hz/60 Hz IEC 62053-21 Less than 0.1% error over a dynamic range of 500 to 1 Compatible with 3-phase, 3-wire delta and 3-phase, 4-wire Wye configurations Supplies average active power on the frequency outputs F1 and F2 High frequency output (CF) is intended for calibration and supplies instantaneous active power Logic output REVP indicates a potential miswiring or negative power on the sum of all phases Direct drive for electromechanical counters and 2-phase stepper motors (F1 and F2) Proprietary ADCs and DSP provide high accuracy over large variations in environmental conditions and time On-chip power supply monitoring On-chip creep protection (no load threshold) On-chip reference 2.4 V 8% (25 ppm/ C typical) with external overdrive capability Single 5 V supply, low power (42.5 mW typical) Low cost CMOS process

GENERAL DESCRIPTION
The ADE7752B1 is a high accuracy polyphase electrical energy measurement IC. The ADE7752B specifications surpass the accuracy requirements as quoted in the IEC62053-21 standard.

The only analog circuitry used in the ADE7752B is in the analog-to-digital converters (ADCs) and reference circuit. All other signal processing (for example, multiplication, filtering, and summation) is carried out in the digital domain. This approach provides superior stability and accuracy over extremes in environmental conditions and over time. The ADE7752B supplies average active power information on the low frequency outputs, F1 and F2. These logic outputs can be used to directly drive an electromechanical counter or to interface with a microcontroller (MCU). The CF logic output gives instantaneous active power information. This output is intended to be used for calibration purposes. The ADE7752B includes a power supply monitoring circuit on the VDD pin. The ADE7752B remains inactive until the supply voltage on VDD reaches 4 V. If the supply falls below 4 V, the ADE7752B resets and no pulses are issued on F1, F2, and CF. Internal phase matching circuitry ensures that the voltage and current channels are
phase matched. An internal no load threshold ensures that the ADE7752B does not exhibit any creep when there is no load. The ADE7752B is available in a 24-lead SOIC package.
1

U.S. Patents pending.

FUNCTIONAL BLOCK DIAGRAM
ABS
17

VDD
3

IAP 5 IAN 6 VAP 16

ADC ADC

HPF

LPF

POWER SUPPLY MONITOR

ADE7752B
IBP IBN
7 8

ADC HPF ADC LPF

DGND

VBP 15

19 CLKIN 20 CLKOUT

ICP 9 ICN 10 VCP 14 VN 13 2.4V REF 4k

ADC ADC

HPF

LPF

DIGITAL-TO-FREQUENCY CONVERTER
12 4 18 22 21 23 24 1
05905-001

AGND

REFIN/OUT

REVP SCF

Figure 1.
Rev. 0
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