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AD7755 Fiches technique(PDF) 6 Page - Analog Devices

No de pièce AD7755
Description  Energy Metering IC with Pulse Output
Download  16 Pages
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Fabricant  AD [Analog Devices]
Site Internet  http://www.analog.com
Logo AD - Analog Devices

AD7755 Fiches technique(HTML) 6 Page - Analog Devices

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REV. B
AD7755
–6–
Pin No.
Mnemonic
Description
21
DGND
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.
22
CF
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.
23, 24
F2, F1
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
TOP VIEW
(Not to Scale)
24
23
22
21
20
19
18
17
16
15
14
13
1
2
3
4
5
6
7
8
9
10
11
12
AD7755
NC = NO CONNECT
DVDD
AC/
DC
AVDD
NC
F1
V1P
V1N
V2N
V2P
RESET
REFIN/OUT
AGND
SCF
F2
CF
DGND
REVP
NC
CLKOUT
CLKIN
G0
G1
S0
S1


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