ADE7761BARSZ-RL datasheet(11/24 Pages) AD

部品番号	ADE7761BARSZ-RL

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

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ADE7761B

Rev. 0 | Page 11 of 24

THEORY OF OPERATION

POWER SUPPLY MONITOR

The ADE7761B continuously monitors the power supply (VDD)

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

4 V ± 5%, the ADE7761B 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 has built-in

hysteresis and filtering that provide 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 VDD does not exceed 5 V ± 5%, as specified for

normal operation.

ADE7761B

REVP - FAULT - CF -

F1 - F2 OUTPUTS

INACTIVE

ACTIVE

TIME

INACTIVE

VDD

5V

4V

0V

Figure 11. On-Chip, Power Supply Monitoring

ANALOG INPUTS

Channel V1 (Current Channel)

The voltage outputs from the current transducers are connected

to the ADE7761B at Channel V1. It has two voltage inputs, V1A

and V1B. These inputs are fully differential with respect to V1N.

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

the power calculation (see the Fault Detection section).

The maximum peak differential signal on V1A − V1N and V1B − V1N

is ±660 mV. However, Channel V1 has a programmable gain

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

Table 5). This gain facilitates easy transducer interfacing.

Table 5. Channel V1 Dynamic Range

PGA

Gain

Maximum Differential Signal (mV)

0

1

660

1

16

41

Figure 12 shows the maximum signal levels on V1A, V1B, and

V1N. 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).

VCM

DIFFERENTIAL INPUT B

±660mV MAX PEAK

V1B

V1N

V1A

V1

VCM

COMMON MODE

±100mV MAX

DIFFERENTIAL INPUT A

±660mV MAX PEAK

AGND

V1A, V1B

+660mV

GAIN

–660mV

GAIN

+ VCM

Figure 12. Maximum Signal Levels, Channel V1

Channel V2 (Voltage Channel)

The output of the line voltage transducer is connected to the

ADE7761B at this analog input. Channel V2 is a single-ended

voltage input. The maximum peak differential signal on

Channel V2 is ±660 mV with respect to V2N. Figure 13 shows the

maximum signal levels that can be connected to Channel V2.

VCM

+660mV + VCM

–660mV + VCM

COMMON MODE

±100mV MAX

V2N

V2P

VCM

V2

DIFFERENTIAL INPUT

±660mV MAX PEAK

V2

Figure 13. Maximum Signal Levels, Channel V2

The differential voltage V2P − V2N must be referenced to a

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

ADE7761B 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 ADE7761B 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 V2N. Figure 14 shows the maximum signal levels that

can be connected to the MISCAL pin.

VCM

+660mV + VCM

COMMON MODE

±100mV MAX

V2N

MISCAL

VCM

MISCAL

DIFFERENTIAL INPUT

±660mV MAX PEAK

MISCAL

AGND

Figure 14. Maximum Signal Levels, MISCAL

The differential voltage, MISCAL − V2N, must be referenced

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

ADE7761B can be driven with common-mode voltages of up to

100 mV with respect to AGND. However, best results are achieved

using a common mode equal to AGND.

同様の部品番号 - ADE7761BARSZ-RL

メーカー	部品番号	データシート	部品情報
Analog Devices	ADE7761	326Kb / 28P	Energy Metering IC with On-Chip Fault and Missing Neutral Detection REV. A
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	ADE7761AARS-REF	518Kb / 24P	Energy Metering IC with On-Chip Fault and Missing Neutral Detection REV. 0
	ADE7761AARS-RL	518Kb / 24P	Energy Metering IC with On-Chip Fault and Missing Neutral Detection REV. 0

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同様の説明 - ADE7761BARSZ-RL

メーカー	部品番号	データシート	部品情報
Analog Devices	ADE7761A	518Kb / 24P	Energy Metering IC with On-Chip Fault and Missing Neutral Detection REV. 0
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More results

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