EVAL-AD7891-1CB Datasheet, PDF (10/12 Pages) Analog Devices – Evaluation Board for Single Supply, 12-Bit 454 kSPS ADC

EVAL-AD7891-1CB
APPENDIX A: CONFIGURATION FILE DESCRIPTION
There are two configuration files on the distribution disk that
comes with the AD7891-1 evaluation board. They are
AD7891IN.CFG, which is used when the EVAL-CONTROL
BOARD provides the CONVST signal, and AD7891EX.CFG,
which is used when an externally provided CONVST signal is
used. They provide initial configuration information to the
AD7891-1.EXE program. Normally no changes need to be
made to the .CFG files. However sometimes it may be desired
to change the initial configuration. This is done by editing the
file to make the changes and then saving the changes before
running the AD7891-1.EXE program. Here is a listing of the
contents of the AD7891IN.CFG file.
[DemoController]
Use69=FALSE
AFlags=TRUE
Sports=FALSE
Voltage=5
[EvalBoard]
Part=AD7891-1
Program=ad7891in.hip
NumBits=12
MaxFrequency=600000
DefaultFrequency=200000
DefaultNsamp=256
BinaryCoding=TwosComplement
;BinaryCoding=Binary
;BinaryCoding=DffsetBinary
[AnalogInput]
InputRange=10
InputOffset=0
There are three main sections to the configuration file. The
name of each section is given in square brackets in the file
listing. These sections are [DemoController], [EvalBoard] and
[AnalogInput]. Comments are included in the listing by
preceeding the comment with a semi-colon.
[DemoController] section
This section controls some of the settings of the EVAL-
CONTROL BOARD card. These settings should not be
changed.
[EvalBoard] section
This section tells the AD7891-1.EXE program the name of the
part being evaluated, the .HIP program that needs to be
downloaded to the ADSP-2111, the number of bits of the ADC,
the maximum sampling frequency, the default sampling
frequency, the default number of samples to be taken and the
form of coding used by the ADC.
The sampling frequencies are in Hertz. There are three valid
types of binary coding. These are TwosComplement, Binary
and OffsetBinary. Binary and OffsetBinary are interpreted in
the same manner in the AD7891-1.EXE program and may be
used interchangeably.
[AnalogInput] section
InputRange gives the default voltage range of the input channel.
Valid values for InputRange for the AD7891-1 are 10 V (for the
± 5 V range) and 20 V (for the ± 10 V range). InputOffset is the
input voltage that returns a code of zero from the AD7891-1. ^{–10–}
REV. A