Evaluation Board Hardware; Ad7403 Description; Power Supplies; Input Signals - Analog Devices EVAL-AD7403FMCZ User Manual

EVAL-AD7403FMCZ User Guide

EVALUATION BOARD HARDWARE

AD7403 DESCRIPTION
This user guide describes the evaluation board for the
isolated ADC. The AD7403 is a second-order, Σ-Δ modulator
that converts an analog input signal into a high speed, 1-bit data
stream with on-chip digital isolation based on Analog Devices,
Inc., iCoupler technology. The
5 V (V ) power supply and accepts a differential input signal
DD1
of ±250 mV (±320 mV full scale). The differential input is
ideally suited to shunt voltage monitoring in high voltage
applications where galvanic isolation is required.
The analog input is continuously sampled by a high performance
analog modulator and converted to a ones density, digital
output stream with a data rate of up to 20 MHz. The original
information can be reconstructed with an appropriate digital
filter. The serial I/O can use a 5 V or a 3.3 V supply (V
The serial interface is digitally isolated. High speed CMOS,
combined with monolithic transformer technology, allows the on-
chip isolation to provide outstanding performance characteristics
that are superior to the performance of alternatives, such as
optocoupler devices. The AD7403
wide-body SOIC package and has an operating temperature range
of −40°C to +125°C.
Complete specifications for the
the AD7403 data sheet and should be consulted in conjunction
with this user guide when using the evaluation board. Full
details on the EVAL-SDP-CH1Z
product page.

POWER SUPPLIES

Care should be taken before applying power and signals to
the evaluation board to ensure that all link positions are set
according to the required operating mode. See Table 2 for the
complete list of link options.
This evaluation board is designed to be supplied via the
SDP-CH1Z. The EVAL-SDP-CH1Z
Table 1. External Power Supplies (Optional)
Power Supply
V
DD1
V
DD2
HIGH_V
AD7403
AD7403 operates from a
).
DD2
device is offered in a 16-lead,
AD7403 device are provided in
are available on the SDP-H1
EVAL-
generates 12 V and 3.3 V
Connector
J5
J6
J7
supply rails. The 12 V supply is connected to the on-board 5 V
linear regulator that supplies the
ADuM6000 generates an isolated 5 V supply to power the V
rail of the AD7403. The 3.3 V supply rail from the
CH1Z is used to supply the V
If the user wishes to supply V
supply in the range of 24 V ± 5% can be connected to the
HIGH_V connector, J7. Alternatively, an external supply in the
range of 5 V ± 10% can be connected to the J5 connector.
The V supply can also be supplied via an external power
DD2
supply in the range of 3 V to 5.5 V via the J6 connector.
There are two main ground planes: GND1 and GND2. These
planes are isolated with a creepage and clearance of 8 mm.
Caution
When the EVAL-AD7403FMCZ
SDP-CH1Z, care must be taken to ensure that if an external
voltage is supplied to the J6 input connector, the voltage does
not exceed 3.3 V. Exceeding this voltage may cause permanent
damage to the

INPUT SIGNALS

The analog input range to the
full scale), which should not be exceeded. An input signal in the
range of 500 mV p-p should be connected to the evaluation
board via the analog input connector, J1.
The EVAL-AD7403FMCZ
that are physically isolated from one other. As such, power to
the analog supply rail is by default, supplied through the on-
board ADuM6000
V can optionally be supplied from the J5 external connector
DD1
or from the J7 high voltage external connector. A 24 V supply
connected to J7 is stepped down to 5 V by means of the on-
board ADP2441
more information about supplying V
Voltage Range
5 V ± 10%
3 V to 5.5 V
3.3 V ± 5%
24 V ± 5%
Rev. 0 | Page 7 of 20
ADuM6000
rail of the AD7403.
DD2
externally, an external power
DD1
is connected to the
EVAL-SDP-CH1Z board.
AD7403 is ±250 mV (±320 mV
has analog and digital ground planes
isolated iCoupler 5 kV, dc-to-dc converter.
step-down dc-to-dc regulator. See Table 2 for
externally.
DD1
Purpose
Analog supply rail
Digital supply rail without EVAL-SDP-CH1Z
Digital supply rail with EVAL-SDP-CH1Z
Analog supply rail (high voltage alternative to J5)
UG-683
with power. The
DD1
EVAL-SDP-
EVAL-
connected
connected