ADE7758_15 datasheet(9/72 Pages) AD

部件名	ADE7758

功能描述	Poly Phase Multifunction Energy Metering IC with Per Phase Information

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Data Sheet

ADE7758

Rev. E | Page 9 of 72

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS

APCF 1

DGND 2

DVDD 3

AVDD 4

DOUT

24

SCLK

23

DIN

22

CS

21

IAP 5

CLKOUT

20

IAN 6

CLKIN

19

IBP 7

IRQ

18

IBN 8

VARCF

17

ICP 9

VAP

16

ICN 10

VBP

15

AGND 11

VCP

14

REFIN/OUT 12

VN

13

ADE7758

TOP VIEW

(Not to Scale)

Figure 5. Pin Configuration

Table 4. Pin Function Descriptions

No.

Mnemonic

Description

1

APCF

Active Power Calibration Frequency (APCF) Logic Output. It provides active power information. This output

is used for operational and calibration purposes. The full-scale output frequency can be scaled by writing to

the APCFNUM and APCFDEN registers (see the Active Power Frequency Output section).

2

DGND

This provides the ground reference for the digital circuitry in the ADE7758, that is, the multiplier, filters, and

digital-to-frequency converter. Because the digital return currents in the ADE7758 are small, it is acceptable to

connect this pin to the analog ground plane of the whole system. However, high bus capacitance on the DOUT

pin can result in noisy digital current that could affect performance.

3

DVDD

Digital Power Supply. This pin provides the supply voltage for the digital circuitry in the ADE7758. 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.

4

AVDD

Analog Power Supply. This pin provides the supply voltage for the analog circuitry in the ADE7758. 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. The Typical Performance Characteristics

show the power supply rejection performance. This pin should be decoupled to AGND with a 10 μF capacitor

in parallel with a ceramic 100 nF capacitor.

5, 6,

7, 8,

9, 10

IAP, IAN,

IBP, IBN,

ICP, ICN

Analog Inputs for Current Channel. This channel is used with the current transducer and is referenced in this

document as the current channel. 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 gain selections of the internal PGA (see

the Analog Inputs section). All inputs have internal ESD protection circuitry. In addition, an overvoltage

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

11

AGND

This pin provides the ground reference for the analog circuitry in the ADE7758, that is, ADCs, temperature sensor,

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, for example, antialiasing filters, current, and

voltage transducers. To keep ground noise around the ADE7758 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.

12

REFIN/OUT

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 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.

13, 14,

15, 16

VN, VCP,

VBP, VAP

Analog Inputs for the Voltage Channel. This channel is used with the voltage transducer and is referenced as

the voltage channels in this document. These inputs are single-ended voltage inputs with the maximum signal

level of ±0.5 V with respect to VN for specified operation. These inputs are voltage inputs with maximum input

signal levels of ±0.5 V, ±0.25 V, and ±0.125 V, depending on the gain selections of the internal PGA (see the

Analog Inputs section). All inputs have internal ESD protection circuitry, and in addition, an overvoltage of

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

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