ADE7761AARSZ-RL【PDF 11/24 页】IC ENERGY METERING 1PHASE 20SSOP

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ADE7761A

OPERATION

V CM

POWER SUPPLY MONITOR

The ADE7761A continuously monitors the power supply (V DD )

with its on-chip, power supply monitor. If the supply is less than

4 V ± 5%, the ADE7761A goes into an inactive state, that is, no

energy is accumulated and the CF, F1, and F2 outputs are

disabled. This is useful to ensure correct device operation at

power-up and during power-down. The power supply monitor

+660mV

GAIN

–660mV

GAIN

V 1A , V 1B

+ V CM

V CM

+ V CM

DIFFERENTIAL INPUT A

±660mV MAX PEAK

COMMON MODE

±100mV MAX

AGND

DIFFERENTIAL INPUT B

±660mV MAX PEAK

V 1A

V 1N

V 1B

has built-in hysteresis and filtering, which provides a high

degree of immunity to false triggering due to noisy supplies.

The power supply and decoupling for the part should be such

that the ripple at V DD does not exceed 5 V ± 5% as specified for

normal operation.

V DD

Figure 12. Maximum Signal Levels, Channel 1

Channel V2 (Voltage Channel)

The output of the line voltage transducer is connected to the

ADE7761A at this analog input. Channel V2 is a single-ended,

voltage input. The maximum peak differential signal on Channel 2

is ±660 mV with respect to V 2N . Figure 13 shows the maximum

signal levels that can be connected to Channel 2.

+660mV + V CM

DIFFERENTIAL INPUT

V 2P

V CM

±660mV MAX PEAK

V 2N

ADE7761A

REVP - FAULT - CF - INACTIVE

F1 - F2 OUTPUTS

TIME

ACTIVE

INACTIVE

–660mV + V CM

COMMON MODE

±100mV MAX

V CM

Figure 11. On-Chip, Power Supply Monitoring

ANALOG INPUTS

Channel V1 (Current Channel)

The voltage outputs from the current transducers are connected

to the ADE7761A at Channel V1. It has two voltage inputs, V 1A

and V 1B . These inputs are fully differential with respect to V 1N .

However, at any one time, only one is selected to perform the

power calculation (see the Fault Detection section).

The maximum peak differential signal on V 1A ? V 1N and V 1B ? V 1N

is ±660 mV. However, Channel 1 has a programmable gain

amplifier (PGA) with user-selectable gains of 1 or 16 (see

Table 5). This gain facilitates easy transducer interfacing.

Table 5. Channel 1 Dynamic Range

Figure 13. Maximum Signal Levels, Channel 2

The differential voltage V 2P ? V 2N must be referenced to a

common mode (usually AGND). The analog inputs of the

ADE7761A can be driven with common-mode voltages of up

to 100 mV with respect to AGND. However, the best results

are achieved using a common mode equal to AGND.

MISCAL Input

The input for the power calibration in missing neutral mode

is connected to the ADE7761A at this analog input. MISCAL is

a single-ended, voltage input. It is recommended to use a dc

signal derived from the voltage reference to drive this pin. The

maximum peak differential signal on MISCAL is 660 mV with

respect to V 2N . Figure 14 shows the maximum signal levels that

can be connected to the MISCAL pin.

PGA

Gain

Maximum Differential Signal (mV)

660

MISCAL

+660mV + V CM

DIFFERENTIAL INPUT

±660mV MAX PEAK

MISCAL

V CM

V 2N

Figure 12 shows the maximum signal levels on V 1A , V 1B , and

V 1N . The maximum differential voltage is ±660 mV divided by

the gain selection. The differential voltage signal on the inputs

must be referenced to a common mode (usually AGND).

COMMON MODE

±100mV MAX

V CM

AGND

Figure 14. Maximum Signal Levels, MISCAL

Rev. 0 | Page 11 of 24

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