REV. 0

–7–

ADE7759

PIN FUNCTION DESCRIPTIONS

Pin No.

Mnemonic

Description

1

RESET

Reset Pin for the ADE7759. A logic low on this pin will hold the ADCs and digital circuitry

(including the serial interface) in a reset condition.

Digital Power Supply. This pin provides the supply voltage for the digital circuitry in the ADE7759.

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 ceramic 100 nF capacitor.

Analog Power Supply. This pin provides the supply voltage for the analog circuitry in the ADE7759.

The supply should be maintained at 5 V

± 5% for specified operation. Every effort should be made

to minimize power supply ripple and noise at this pin by the use of proper decoupling method.

This pin should be decoupled to AGND with a 10

µF capacitor in parallel with a ceramic 100 nF

capacitor.

4, 5

V1P, V1N

Analog Inputs for Channel 1. This channel is intended for use with the di/dt current transducers

such as Rogowski coil, or other current sensors such as shunt or current transformer (CT). These

inputs are fully differential voltage inputs with maximum differential input signal levels of

±0.5 V,

±0.25 V and ±0.125 V, depending on the full scale selection—See Analog Inputs section. Channel

1 also has a PGA with gain selections of 1, 2, 4, 8, or 16. The maximum signal level at these pins

with respect to AGND is

±0.5 V. 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.

6, 7

V2N, V2P

Analog Inputs for Channel 2. This channel is intended for use with the voltage transducer. These inputs

are fully differential voltage inputs with a maximum differential signal level of

±0.5 V. Channel 2

also has a PGA with gain selections of 1, 2, 4, 8, or 16. The maximum signal level at these pins

with respect to AGND is

±0.5 V. Both inputs have internal ESD protection circuitry, and an over-

voltage of

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

8

AGND

This pin provides the ground reference for the analog circuitry in the ADE7759, i.e., 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, e.g., antialiasing

filters, current and voltage transducers, etc. In order to keep ground noise around the ADE7759

to a minimum, the quiet ground plane should be connected to the digital ground plane at only

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

Information section.

9

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 be connected at this pin. In either case this pin should be decoupled to AGND with

a 1

µF capacitor in parallel with a 100 nF capacitor.

10

DGND

This provides the ground reference for the digital circuitry in the ADE7759, i.e., multiplier, filters,

and frequency output (CF). Because the digital return currents in the ADE7759 are small, it is

acceptable to connect this pin to the analog ground plane of the system—see Application Information

section. However, high bus capacitance on the DOUT pin may result in noisy digital current that

affects performance.

11

CF

Calibration Frequency Logic Output. The CF logic output gives Active Power information. This

output is intended to be used for operational and calibration purposes. The full-scale output fre-

quency can be adjusted by writing to the APGAIN, CFNUM and CFDEN Registers—see Energy

to Frequency Conversion section.

PIN CONFIGURATION

TOP VIEW

(Not to Scale)

ADE7759

RESET

DIN

DOUT

SCLK

V1P

CS

V1N

CLKOUT

V2N

CLKIN

V2P

IRQ

AGND

SAG

ZX

DGND

CF

20

19

18

17

16

15

14

13

12

11

1

2

3

4

5

6

7

8

9

10