ADE7758(2004) Ver la hoja de datos (PDF) - Analog Devices

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componentes Descripción

Fabricante

ADE7758
(Rev.:2004)

Poly Phase Multifunction Energy Metering IC with Per Phase Information

Analog Devices 

ADE7758

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS

APCF 1

24 DOUT

DGND 2

23 SCLK

DVDD 3

22 DIN

AVDD 4

21 CS

IAP 5 ADE7758 20 CLKOUT

IAN 6 TOP VIEW 19 CLKIN

IBP 7 (Not to Scale) 18 IRQ

IBN 8

17 VARCF

ICP 9

16 VAP

ICN 10

15 VBP

AGND 11

14 VCP

REFIN/OUT 12

13 VN

Figure 5. Pin Configuration

Table 4. Pin Function Descriptions

Pin 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, i.e., 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 may result in noisy digital current which 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

graphs 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;

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

7, 8;

IBP, IBN;

document as the current channel. These inputs are fully differential voltage inputs with maximum differential

9, 10

ICP, ICN

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 sections).

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.

11

AGND

This pin provides the ground reference for the analog circuitry in the ADE7758, i.e., 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. In order to keep ground noise around the ADE7758 to a minimum, the quiet

ground plane should only be connected to the digital ground plane at 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

2.5 V ± 8% and a typical temperature coefficient of 30 ppm/°C. An external reference source may 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, VN, VCP,

16

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.

Rev. A | Page 10 of 68

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