ad7755 Analog Devices, Inc., ad7755 Datasheet - Page 6

• Manufacturer Part Number: ad7755
• Description: Energy Metering Ic With Pulse Output
• Manufacturer: Analog Devices, Inc.

AD7755
Pin No.
21
22
23, 24
Mnemonic
DGND
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.
REF
RESET
AC/DC
DIP and SSOP Packages
AGND
IN/OUT
PIN CONFIGURATION
DV
AV
SCF
V1P
V1N
V2N
V2P
NC
DD
DD
12
10
11
NC = NO CONNECT
1
2
3
4
5
6
7
8
9
(Not to Scale)
TOP VIEW
AD7755
24
23
22
21
20
19
18
17
16
15
14
13
F1
F2
CF
DGND
REVP
NC
CLKOUT
CLKIN
G0
G1
S0
S1