ADE7761B

Rev. 0 | Page 6 of 24

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS

S0

SCF

S1

F1

F2

CF

DGND

REVP

FAULT

MISCAL

RCLKIN

AGND

PGA

1

2

3

4

20

19

18

17

5

6

7

16

15

14

8

13

9

12

10

11

ADE7761B

TOP VIEW

(Not to Scale)

Figure 3. Pin Configuration (SSOP)

Table 4. Pin Function Descriptions

Pin No.

Mnemonic

Description

1

Power Supply. This pin provides the supply voltage for the digital circuitry in the ADE7761B. The supply voltage

should be maintained at 5 V ± 5% for specified operation. This pin should be decoupled with a 10 μF capacitor

in parallel with a ceramic 100 nF capacitor.

2, 3

Analog Inputs for Channel V1 (Current Channel). These inputs are fully differential voltage inputs with maximum

at these pins is ±1 V with respect to AGND. Both inputs have internal ESD protection circuitry, and an overvoltage

of ±6 V can also be sustained on these inputs without risk of permanent damage.

4

to AGND. The input has internal ESD protection circuitry, and an overvoltage of ±6 V can also be sustained on this

input without risk of permanent damage. The input should be directly connected to the burden resistor and held

at a fixed potential, that is, AGND. See the Analog Inputs section.

5

respect to AGND. The input has internal ESD protection circuitry, and an overvoltage of ±6 V can also be sustained

on this input without risk of permanent damage. The input should be held at a fixed potential, that is, AGND. See

the Analog Inputs section.

6

Analog Input for Channel V2 (Voltage Channel). This input is a fully differential voltage input with maximum

this pin is ±1 V with respect to AGND. This input has internal ESD protection circuitry, and an overvoltage of ±6 V

can also be sustained on this input without risk of permanent damage.

7

MISCAL

missing neutral condition. This input is a fully differential voltage input with maximum differential input signal

to AGND. This input has internal ESD protection circuitry, and an overvoltage of ±6 V can also be sustained on this

input without risk of permanent damage.

8

AGND

Analog Ground. This pin provides the ground reference for the analog circuitry in the ADE7761B, that is, ADCs and

reference. This pin should be tied to the analog ground plane of the PCB. The analog ground plane is the ground

reference for all analog circuitry such as antialiasing filters and current and voltage transducers. For good noise

suppression, the analog ground plane should be connected to the digital ground plane only at the DGND pin.

9

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

2.5 V ± 8% and a typical temperature coefficient of 30 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 and

100 nF ceramic capacitor.

10

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.

11, 12

S1, S0

These logic inputs are used to select one of four possible frequencies for the digital-to-frequency conversion.

This offers the designer greater flexibility when designing the energy meter. See the Selecting a Frequency for an

Energy Meter Application section.

13

PGA

14

RCLKIN

To enable the internal oscillator as a clock source on the chip, a precise low temperature drift resistor at

a nominal value of 6.2 kΩ must be connected from this pin to DGND.