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EVAL-AD7714-3EB Datasheet(PDF) 5 Page - Analog Devices

Part No. EVAL-AD7714-3EB
Description  Evaluation Board for Signal Conditioning ADC
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Maker  AD [Analog Devices]
Homepage  http://www.analog.com
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EVAL-AD7714-3EB Datasheet(HTML) 5 Page - Analog Devices

   
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EVAL-AD7714-3EB
REV. A
–5–
RUNNING THE AD7714 INTERFACE SOFTWARE.
Included in the evaluation board package is a PC-compatible
disk which contains software for controlling and evaluating the
performance of the AD7714 using the printer port of a PC.
There are two files on the disk, an executable file and a
"README" text file which gives details of the functions
available in the executable program. The executable program
runs under DOS and it is advised that the user copies this file to
the system hard disk to obtain optimum performance from the
software.
To run the evaluation software simply run the executable file.
The program provides a number of different menu-type screens,
each screen containing several function options. On each of
these menu-screens the user can choose the function by pressing
the associated number key or click on the required option using
the mouse. Alternatively, the user can scroll up or down the
screen using the arrow keys to the required function and then
hit the RETURN key. The "README" file gives a detailed
description of each of the menus and the procedure to use the
software to evaluate the board. A brief description of the
procedure is outlined below.
PC Configuration
The first menu gives options on the type of PC being used. The
printer port needs to be configured correctly for one of the many
different PC-types for interfacing to the AD7714. Choose the
required printer type from the menu. The next menu gives
options on the port address to be used. Choose the required
port address. The PC printer port is now configured for
operation with the AD7714 evaluation board.
AD7714 Configuration
The next menu in the sequence is the Main Menu which
contains 6 options. These allow reading from the data register,
configuration of the communications register, file options (read
and write data to files), noise analysis, printer port setup and
resetting the AD7714.
The first option to select in this Main Menu is option 1
(Communications Register). This calls up the Comms
Register Menu which has 8 options.
The first option to select in the Comms Register Menu is
option 0 (Channel Selection) which allows the user to set up
the required analog input channel. After selecting the desired
channel pair in the Channel Configuration Menu, the
program returns to the Main Menu. Select option 1 (Filter
Registers) which allows the user to enter the clock frequency
being used, program the filter cutoff, data word length required
and bipolar or unipolar operation.
After selecting all the required parameters in the Filter Regis-
ters Menu, choose option 6 (Exit) to return to the Comms
Register Menu. In this menu select option 2 (Mode Regis-
ter). This brings up the Mode Register Menu which allows
the gain of the PGA to be programmed, turns on/off the
burnout current, allows software filter synchronization and
allows the various calibration modes to be selected. Calibration
should be the last operation to be completed. When calibration
is complete, choose option 9 (Exit) to return to the Comms
Register Menu. All parameters on the part should now be set
up, so choose option 8 (Exit) to return to the Main Menu.
From the Main Menu select the option 0 (Read from Data
Register). The number of readings required is prompted and as
the read operation proceeds the value read from the AD7714's
data register is displayed on the screen.
Data Analysis
When all the data has been read, the program returns the user
to the Main Menu. It is possible to write the data which has
been read to a file by selecting option 2 (Files Option) or
analyze the data by selecting option 3 (Do Noise Analysis).
The Noise Menu allows the user to get statistical results from
the data, to plot the raw data, plot a histogram of the data on
the screen or perform a rolling average on the data. To return to
the Main Menu from the Noise Menu choose option 5 (Exit).
SOCKETS
There are eleven sockets on the AD7714-3 evaluation board.
The function of these sockets is outlined in Table IV.
Table IV. Socket Functions
Socket
Function
SKT1
9-Way D-Type Connector which can be used for
digital interfacing to the evaluation board.
SKT2
Sub-Minature BNC Connector. The analog input
signal for the AIN1 input of the AD7714 is applied
to this socket.
SKT3
Sub-Minature BNC Connector. The analog input
signal for the AIN2 input of the AD7714 is applied
to this socket.
SKT4
Sub-Minature BNC Connector. The analog input
signal for the AIN3 input of the AD7714 is applied
to this socket.
SKT5
Sub-Minature BNC Connector. The analog input
signal for the AIN4 input of the AD7714 is applied
to this socket.
SKT6
Sub-Minature BNC Connector. The master clock
signal for the MCLK IN input of the AD7714 is
applied to this socket when the board is configured
for an externally-applied master clock.
SKT7
Sub-Minature BNC Connector. The analog input
signal for the AIN6 input of the AD7714 is applied
to this socket.
SKT8
Sub-Minature BNC Connector. The analog input
signal for the AIN5 input of the AD7714 is applied
to this socket.
SKT9
Sub-Minature BNC Connector. The reference
voltage for the REF IN(+) input of the AD7714 is
applied to this socket when the board is configured
for an externally-applied reference voltage.
SKT10
Sub-Minature BNC Connector. The reference
voltage for the REF IN(-) input of the AD7714 is
applied to this socket when the board is configured
for an externally-applied reference voltage.
SKT11
36-Way Centronics Connector which can be used
for digital interfacing to the evaluation board. This
connector should be used when connecting the
board to the parallel printer port of the PC to use
the evaluation software.


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