EVAL-AD7731EB Analog Devices Inc, EVAL-AD7731EB Datasheet - Page 5

• Manufacturer Part Number: EVAL-AD7731EB
• Description: BOARD EVAL FOR AD7731
• Manufacturer: Analog Devices Inc

Specifications of EVAL-AD7731EB

• Number Of Adc's: 1
• Number Of Bits: 24
• Sampling Rate (per Second): 6.4k
• Data Interface: Serial
• Inputs Per Adc: 3 Differential
• Input Range: ±1.28 V
• Power (typ) @ Conditions: 67.5mW @ 6.4kSPS
• Voltage Supply Source: Analog and Digital
• Operating Temperature: -40°C ~ 85°C
• Utilized Ic / Part: AD7731
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

SOCKETS
There are eleven sockets on the AD7731 evaluation board.
The function of these sockets is outlined in Table IV.
Table IV. Socket Functions
Socket
SKT1
SKT2
SKT3
SKT4
SKT5
SKT6
SKT7
SKT8
SKT9
SKT10
SKT11
REV. A
used for digital interfacing to the evaluation
board.
be used for digital interfacing to the evalu-
ation board. This connector should be used
when connecting the board to the parallel
printer port of the PC to use the evaluation
software.
analog input signal for the AIN1 input of the
AD7731 is applied to this socket.
analog input signal for the AIN2 input of the
AD7731 is applied to this socket.
Connects to the AIN3/D1 pin of the AD7731.
Connects to the AIN4/D0 pin of the AD7731.
Connects to the AIN5 pin of the AD7731.
Connects to the AIN6 pin of the AD7731.
reference voltage for the REF IN(+) input
of the AD7731 is applied to this socket when
the board is configured for an externally-
applied reference voltage.
reference voltage for the REF IN(-) input of
the AD7731 is applied to this socket when
the board is configured for an externally-
applied reference voltage.
master clock signal for the MCLK IN input
of the AD7731 is applied to this socket when
the board is configured for an externally-
applied master clock.
Function
9-Way D-Type Connector which can be
36-Way Centronics Connector which can
Sub-Minature BNC (SMB) Connector. The
Sub-Minature BNC (SMB) Connector. The
Sub-Minature BNC (SMB) Connector.
Sub-Minature BNC (SMB) Connector.
Sub-Minature BNC (SMB) Connector.
Sub-Minature BNC (SMB) Connector.
Sub-Minature BNC (SMB) Connector. The
Sub-Minature BNC (SMB) Connector. The
Sub-Minature BNC (SMB) Connector. The
–5–
RUNNING
Included in the evaluation board package is a PC-compatible
disk which contains software for controlling and evaluating the
performance of the AD7731 using the printer port of a PC.
There are a total of thirteen files on the distribution disk.
To use the software, the user must have an IBM-compatible PC
and Windows 3.1 must be installed. Start Windows and, using
either the RUN command or the File Manager, start the
program called SETUP.EXE on the distribution disk. This
automatically installs the application and sets up a window
called ANALOG DEVICES. The application ICON is found
here. To start the application, double click on the ICON.
When the program starts, the user is asked to select a printer
port. The correct selection depends on what type of computer
is being used (Desktop, Laptop etc). LPT1 works for most
machines. When using a Compaq laptop, select PRN. A
different port can be selected at any time from the MAIN
MENU.
After selecting the printer port, the program displays the Main
Menu as outlined in Figure 4. There are a number of buttons
on the Main Menu which select a variety of different functions.
These are described below.
Program AD7731
Pressing this button calls up a second screen which displays the
contents of the Status Register and provides another set of
buttons allowing the user to program the on-chip registers.
Figure 5 shows the "Program AD7731" screen. Pressing any of
the buttons on this screen pulls up a further screen allowing all
functions in a register to be programmed. Figure 6 gives an
example of one of these screens (the screen for programming
the Mode Register).
Read Data
The Read Data button allows the user access to the "read data"
screen. On this screen, the user can choose whether the reading
of data is for noise analysis or simply for display. It also allows
the user to choose how many outputs of the AD7731 should be
read for the noise analysis routines.
Noise Analysis
The Noise Analysis button gives the user access to the "noise
analysis" screen. Here the user can look at the results of a data
read in terms of rms code distribution, code spread etc. The
user also has the facility to plot the data versus time and plot
histogram results.
Reset AD7731
Pressing this button allows the user access to the reset menu
where either a hardware reset (via the RESET pin) or an
software reset (via writing 32 1's) can be selected. The user also
has a hardware reset button on the board.
THE AD7731 INTERFACE SOFTWARE
EVAL-AD7731EB