ADE7761ARS Ver la hoja de datos (PDF) - Analog Devices

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ADE7761ARS

Energy Metering IC with On-Chip Fault and Missing Neutral Detection

Analog Devices 

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS

ADE7761

VDD 1

20 F1

V1A 2

19 F2

V1B 3

18 CF

V1N

V2N

V2P

MISCAL

4

17 DGND

5 ADE7761 16 REVP

TOP VIEW

6 (Not to Scale) 15 FAULT

7

14 RCLKIN

AGND 8

13 INT

REFIN/OUT 9

SCF 10

12 S0

11 S1

Table 4. Pin Function Descriptions

Figure 3. Pin Configuration (SSOP)

E Pin No.

Mnemonic

Description

T 1

VDD

Power Supply. This pin provides the supply voltage for the digital circuitry in the ADE7761. 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

V1A, V1B

Analog Inputs for Channel 1 (Current Channel). These inputs are fully differential voltage inputs with

maximum differential input signal levels of ±660 mV with respect to V1N for specified operation. The

maximum signal level at these pins is ±1 V with respect to AGND. Both inputs have internal ESD

E protection circuitry, and an overvoltage of ±6 V can also be sustained on these inputs without risk of

permanent damage.

L 4

V1N

Negative Input Pin for Differential Voltage Inputs V1A and V1B. The maximum signal level at this pin is

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

can also be sustained on these inputs 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.

O 5

V2N

Negative Input Pin for Differential Voltage Inputs V2P and MISCAL. The maximum signal level at this pin is

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

can also be sustained on these inputs without risk of permanent damage. The input should be held at a

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

S 6

V2P

Analog Inputs for Channel 2 (Voltage Channel). This input is fully differential voltage input with

maximum differential input signal levels of ±660 mV with respect to V2N for specified operation. The

maximum signal level at these pins 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 these inputs without risk of permanent

damage.

7

MISCAL

Analog Input for Missing Neutral Calibration. This pin can be used to calibrate the CF-F1-F2 frequencies

Bin the missing neutral condition. This input is fully differential voltage input with maximum differential

input signal levels of +660 mV with respect to V2N for specified operation. The maximum signal level at

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 these inputs without risk of permanent damage.

O 8

AGND

This pin provides the ground reference for the analog circuitry in the ADE7761, 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 only to the digital ground

plane at the DGND pin.

9

REFIN/OUT

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 6 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.

Rev. A | Page 9 of 28

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