3-Phase, 3-Wire, and 4-Wire

Energy Metering IC with Pulse Output

ADE7752B

Rev. 0

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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 ADE7752B 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

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.

FUNCTIONAL BLOCK DIAGRAM

17

3

2

19

20

1

24

23

21

22

18

12

11

LPF

HPF

Ф

CLKOUT

CLKIN

DGND

CF

S0

F1

F2

S1

SCF

DIGITAL-TO-FREQUENCY CONVERTER

2.4V REF

AGND

4kΩ

IBP

IBN

VBP

VN

ICP

ICN

VCP

IAP

IAN

VAP

ADC

ADC

ADC

ADC

ADE7752B

POWER

SUPPLY

MONITOR

ADC

ADC

HPF

Ф

HPF

Ф

LPF

LPF

X

ABS

13

10

9

15

8

7

16

6

5

14

X

X

4

REVP

Figure 1.