AD7755 Ver la hoja de datos (PDF) - Analog Devices

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componentes Descripción

Fabricante

AD7755

Energy Metering IC with Pulse Output

Analog Devices 

AD7755

Pin No. Mnemonic

21

DGND

22

23, 24

CF

F2, F1

Description

This provides the ground reference for the digital circuitry in the AD7755, i.e., multiplier, filters and

digital-to-frequency converter. This pin should be tied to the analog ground plane of the PCB. The

digital ground plane is the ground reference for all digital circuitry, e.g., counters (mechanical and

digital), MCUs and indicator LEDs. For good noise suppression the analog ground plane should only

be connected to the digital ground plane at one point only, e.g., a star ground.

Calibration Frequency Logic Output. The CF logic output gives instantaneous real power informa-

tion. This output is intended to be used for calibration purposes. Also see SCF pin description.

Low Frequency Logic Outputs. F1 and F2 supply average real power information. The logic outputs

can be used to directly drive electromechanical counters and two phase stepper motors. See Transfer

Function section.

PIN CONFIGURATION

DIP and SSOP Packages

DVDD 1

AC/DC 2

24 F1

23 F2

AVDD 3

NC 4

22 CF

21 DGND

V1P 5

20 REVP

AD7755

V1N 6 TOP VIEW 19 NC

V2N 7 (Not to Scale) 18 CLKOUT

V2P 8

17 CLKIN

RESET 9

16 G0

REFIN/OUT 10

AGND 11

15 G1

14 S0

SCF 12

13 S1

NC = NO CONNECT

–6–

REV. B

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