EVAL-AD766XCB Datasheet, PDF (5/15 Pages) Analog Devices – Evaluation Board AD766X/AD767X

PRELIMINARY TECHNICAL DATA
EVAL-AD766XCB/AD767XCB
TESTING METHODS
Histogram
USE OF EVAL-AD766XCB/AD767XCB AS STAND-
ALONE EVALUATION BOARD
To perform a histogram test, apply a DC signal to the input. It _{You have the option of using the}
is advised to filter the signal to make the DC Source noise com- _{EVAL-AD766XCB/AD767XCB as a stand-alone evaluation}
patible with that of the ADC. C26 provides this filtering.
board. This method does not require the control board, nor does
AC Testing
it require use of the accompanied software. The digital output
To perform an AC test, apply a sinusoidal signal to the
will now be available on P1 (20-pin connector, for use in serial
evaluation board. Low distortion, better than 100dB, is required ^{mode) or P2 (40-pin connector, for use in parallel mode). Cer-}
to allow true evaluation of the part. One possibility is to filter the ^{tain modifications have to be made on the board to allow proper}
input signal from the AC source. There is no suggested
operation of the evaluation board. Refer to Table II to obtain
bandpass filter but consideration should be taken in the choice.
Furthermore, when the full-scale input range is more than a few
the jumper positions for stand-alone operation. When in stand-
alone, CNVST could be externally applied or is generated
Vpp, it is recommended that you use the on board amplifier to ^{internally according to Table I.}
amplify the signal, thus preventing the filter from distorting the
input signal.
Please refer to Figure 1 to obtain the data output pins on the
connectors.
Please refer to Figures 8,9,10 and 11 to see the screens of the
software.
Software Description
The AD16bit.exe is the software which allows you to analyze
different performance characteristics of the AD766X,
AD767X, AD97X and AD67X 16-bit ADC family. The soft-
ware allows you to test the histogram as well as perform
different AC tests.
Setup Requirements
Data is updated on the falling edge of BUSY. BCS and BWR
are inputs to the FPGA and are connected to P1 and P2.
When BCS, CONTROL are low and BWR is high, which is
the default value defined by the on-board pull-up/pull-down
resistors, the data bus BD available on the P2 connector is
enabled.
SUPPLYING THE BOARD FOR STAND-ALONE USE
SJ1 is the analog supply. Connect VA+ to +5V and AGND to
GND. SJ2 is the digital supply. SJ2 requires the same values as
SJ1, and SJ2 may be connected to SJ1. SJ3 is the supply for the
front end amplifier (U6). Connect +12V to VS+, GND to
AGND, and -12V to VS-.
- Evaluation Control Board 2 (ADSP2189)
- Evaluation Board
- Power Supply (AC 15V/1A source could be bought from
ADI)
- Parallel Port Cable (provided with the evaluation control
board)
- AC Source (low distortion)
- DC Source (low noise)
- Bandpass Filter (value based on your signal frequency, low
distortion)
REV PrK
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