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ADE7752BARW-RL

Polyphase Energy Metering IC with Pulsed Output

Analog Devices 

Preliminary Technical Data

ADE7752B

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS

CF 1

24 F1

DGND 2

23 F2

VDD 3

REVP 4

22 S1

21 S0

IAP 5 ADE7752B 20 CLKOUT

IAN 6 TOP VIEW 19 CLKIN

IBP 7 (Not to Scale) 18 SCF

IBN 8

17 ABS

ICP 9

16 VAP

ICN 10

15 VBP

AGND 11

14 VCP

REFIN/OUT 12

13 VN

Figure 3. Pin Configuration

Table 4. Pin Function Descriptions

Pin No. Mnemonic

Description

1

CF

Calibration Frequency Logic Output. The CF logic output gives instantaneous active power information.

This output is intended to be used for calibration purposes.

2

DGND

This provides the ground reference for the digital circuitry in the ADE7752B, that is, multiplier, filters,

and digital-to-frequency converter. Because the digital return currents in the ADE7752B are small, it is

acceptable to connect this pin to the analog ground plane of the whole system.

3

VDD

Power Supply. This pin provides the supply voltage for the digital circuitry in the ADE7752B. The supply

voltage should be maintained at 5 V ± 5% for specified operation. This pin should be decoupled to

DGND with a 10 μF capacitor in parallel with a 100 nF ceramic capacitor.

4

REVP

This logic output goes logic high when negative power is detected on the sum of the three phase

powers. This output is not latched and resets when positive power is once again detected (see the

Negative Power Information section).

5, 6;

IAP, IAN;

7, 8;

IBP, IBN;

9, 10

ICP, ICN

Analog Inputs for Current Channels. These channels are intended for use with current transducers and

are referenced in this document as current channels. These inputs are fully differential voltage inputs

with maximum differential input signal levels of ±0.5 V (see the Analog Inputs section). Both inputs

have internal ESD protection circuitry; in addition, an overvoltage of ±6 V can be sustained on these

inputs without risk of permanent damage.

11

AGND

This pin provides the ground reference for the analog circuitry in the ADE7752B (ADCs and reference).

This pin should be tied to the analog ground plane or the quietest ground reference in the system. This

quiet ground reference should be used for all analog circuitry, such as, anti-aliasing filters and current

and voltage transducers. To keep ground noise around the ADE7752B to a minimum, the quiet ground

plane should only connect to the digital ground plane at one point. It is acceptable to place the entire

device on the analog ground plane.

12

REFIN/OUT

This pin provides access to the on-chip voltage reference. The on-chip reference has a nominal value of

2.4 V ±8% and a typical temperature coefficient of 25 ppm/°C. An external reference source can also be

connected at this pin. In either case, this pin should be decoupled to AGND with a 1 μF ceramic

capacitor.

13, 14, 15, VN, VCP, VBP, VAP

16

Analog Inputs for the Voltage Channels. These channels are intended for use with voltage transducers

and are referenced in this document as voltage channels. These inputs are single-ended voltage inputs

with a maximum signal level of ±0.5 V with respect to VN for specified operation. All inputs have

internal ESD protection circuitry; in addition, an overvoltage of ±6 V can be sustained on these inputs

without risk of permanent damage.

17

ABS

This logic input is used to select the method by which the three active energies from each phase are

summed. It selects between the arithmetical sum of the three energies (ABS logic high) or the sum of

the absolute values (ABS logic low). See the Mode Selection of the Sum of the Three Active Energies

section.

18

SCF

Select Calibration Frequency. This logic input is used to select the frequency on the calibration output

CF. Table 7 shows how the calibration frequencies are selected.

19

CLKIN

Master Clock for the ADCs and Digital Signal Processing. An external clock can be provided at this logic

input. Alternatively, a parallel resonant AT crystal can be connected across CLKIN and CLKOUT to

provide a clock source for the ADE7752B. The clock frequency for the specified operation is 10 MHz.

Ceramic load capacitors between 22 pF and 33 pF should be used with the gate oscillator circuit. Refer

to the crystal manufacturer’s data sheet for the load capacitance requirements.

Rev. PrA | Page 7 of 27

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