EVAL-ADE7756EB Datasheet, PDF (1/15 Pages) Analog Devices – Evaluation Board Documentation AD7756 Energy metering IC

PRELIMINARY TECHNICAL DATA
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Evaluation Board Documentation
AD7756 Energy metering IC
Preliminary Technical Data
EVAL-ADE7756EB
FEATURES
Evaluation Board is designed to be used together with
accompanying software to implement a fully functional
Energy Meter (Watt-Hour Meter).
Easy connection of various external transducers via
screw terminals.
Easy modification of signal conditioning components
using PCB sockets.
LED indicators on logic outputs CF, ZX, SAG and IRQ.
Optically isolated data output connection to PC parallel port.
Optically isolated frequency output (CF) to BNC.
External Reference option available for
on-chip reference evaluation.
GENERAL DESCRIPTION
The ADE7756 is a high accuracy electrical power mea-
surement IC with a serial interface and a pulse output.
The ADE7756 incorporates two second order sigma delta
ADCs, reference circuitry, temperature sensor and all the
signal processing required to perform active power and
energy measurement.
This documentation describes the ADE7756 evaluation kit
Hardware and Software functionality. The ADE7756
evaluation board, together with the ADE7756 data sheet
and this documentation provides a complete evaluation
platform for the ADE7756.
The evaluation board has been designed so that the
ADE7756 can be evaluated in the end application, i.e.,
Watt-Hour Meter. Using the appropriate transducers on
the current channel (e.g., shunt, CT etc.) the evaluation
board can be connected to a test bench or high voltage
(240V rms) test circuit. An on-board resistor divider
network provides the attenuation for the line voltage. This
application note also describes how the current transducers
should be connected for the best performance.
The evaluation board (watt-hour meter) is configured and
calibrated via the parallel port of a PC. The data interface
between the evaluation board and the PC is fully isolated.
Windows^TM based software is provided with the evaluation
board which allows it to be quickly configured as an
energy meter.
The evaluation board also functions as a stand alone
evaluation system which can be easily incorporated into an
existing system via a 25 way D-Sub connector.
The evaluation board requires two external 5V power
supplies (one is required for isolation purposes) and the
appropriate current transducer.
FUNCTIONAL BLOCK DIAGRAM
V1P
V1N
AGND
AGND AVDD
DV_{DD DGND} +5V
V+ V-
Filter
Network
ADE7756
74HC08
DOUT
SCLK
DIN
CS
RESET
V2N
V2P
Filter
Network
&
Attenuation
Optional External ^AD780
2.5V Reference
PROTOTYPE
AREA
74HC08
BNC
External
Clock in
Isolated Frequency
output
BNC
CF
CF ZX SAG IRQ
Connector to
PC Parallel
Port
REV. PrB 01/01
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