Datasheet

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ADE7752/ADE7752A

Rev. C | Page 6 of 24

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS

TOP VIEW

(Not to Scale)

ADE7752/

ADE7752A

REF

IN/OUT

AGND

ICN

ICP

IBN

DGND

REVP

IBP

IAN

IAP

VCP

VBP

VAP

ABS

SCF

CLKIN

CLKOUT

02676-A -003

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 real power information.

This output is intended to be used for calibration purposes. See the SCF pin description.

2 DGND This provides the ground reference for the digital circuitry in the ADE7752: the multiplier, filters, and

digital-to-frequency converter. Because the digital return currents in the ADE7752 are small, it is

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

3 V

Power Supply. This pin provides the supply voltage for the digital circuitry in the ADE7752. 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 any of the three phase inputs,

that is, when the phase angle between the voltage and the current signals is greater than 90°. This

output is not latched and is reset when positive power is once again detected. See the Negative Power

Information

section.

5, 6;

7, 8;

9, 10

IAP, IAN;

IBP, IBN;

ICP, ICN

Analog Inputs for Current Channel. This channel is intended for use with the current transducer and is

referenced in this document as the current channel. 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 ADE7752: the ADCs, temperature

sensor, 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

antialiasing filters, current and voltage transducers, and so on. To keep ground noise around the

ADE7752 to a minimum, the quiet ground plane should connect to the digital ground plane at only

one point. It is acceptable to place the entire device on the analog ground plane.

12 REF

IN/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 20 ppm/°C. An external reference source may also be

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

13–16 VN, VCP, VBP,

VAP

Analog Inputs for the Voltage Channel. This channel is intended for use with the voltage transducer and

is referenced in this document as the voltage channel. 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.

ABS

This logic input is used to select the way the three active energies from the three phases are summed.

This offers the designer the capability to do 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.