EVAL-AD7654CBZ Analog Devices Inc, EVAL-AD7654CBZ Datasheet - Page 6

• Manufacturer Part Number: EVAL-AD7654CBZ
• Description: BOARD EVALUATION FOR AD7654
• Manufacturer: Analog Devices Inc
• Series: PulSAR®r

Specifications of EVAL-AD7654CBZ

• Number Of Adc's: 2
• Number Of Bits: 16
• Sampling Rate (per Second): 500k
• Data Interface: Serial, Parallel
• Inputs Per Adc: 2 Differential
• Input Range: 0 ~ 5 V
• Power (typ) @ Conditions: 120mW @ 500kSPS
• Voltage Supply Source: Analog and Digital
• Operating Temperature: -40°C ~ 85°C
• Utilized Ic / Part: AD7654
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

EVAL-AD76XXCBZ
The software is located at C:\Program Files\Analog Devices\Hi-
res ADC’s CED x.x.
A shortcut is also added to the Windows “Start” menu under
“Analog Devices”, “Hi-Res ADC’s Evaluation Software CED Rev
x.x”. To run the software, select the program “ADC Eval SW
CED.exe” from either location. Note that the ECB can be used
with this version of software as well.
ECB Version
All of the evaluation boards are supported in this version. Refer
to Figure 18 to Figure 22for further details and features of this
software. The software is located at C:\Program Files\Analog
Devices\Hi-res ADC’s.
A shortcut is also added to the Windows “Start” menu under
“Analog Devices”, “Hi-Res ADC’s Evaluation Software Rev x.x”.
To run the software, select the program “ADC.exe” from either
location.
DC TESTING - HISTOGRAM
This tests the ADC for the code distribution for DC input and
computes the mean and standard deviation, or transition noise
of the converter and displays the results. Raw data is captured
and passed to the PC for statistical computations. To perform a
histogram test, select “Histogram” from the test selection
window and click on the “Start” radio button. Note: a histogram
test can be performed without an external source since the
evaluation board has a buffered V
for unipolar parts and at 0V for bipolar devices. To test other
DC values, apply a source to the J1/J2 inputs. It is advised to
filter the signal to make the DC source noise compatible with
that of the ADC. C26/C41 provide this filtering.
AC TESTING
This tests the traditional AC characteristics of the converter and
displays a Fast Fourier Transform (FFT) of the result. As in the
histogram test, raw data is captured and passed to the PC where
the FFT is performed thus displaying SNR, SINAD, THD and
SFDR. The data can also be displayed in the time domain. To
REF
/2 source at the ADC input
Rev. PrA | Page 6 of 30
perform an AC test, apply a sinusoidal signal to the evaluation
board at the SMB inputs J1 for IN+ and J2 for IN-. Low
distortion, better than 100dB, is required to allow true
evaluation of the part. One possibility is to filter the input signal
from the AC source. There is no suggested bandpass filter but
consideration should be taken in the choice. Furthermore, if
using a low frequency bandpass filter when the full-scale input
range is more than a few Vpp, it is recommended to use the on
board amplifiers to amplify the signal, thus preventing the filter
from distorting the input signal.
DECIMATED AC TESTING
The AC performances can be evaluated after digital filtering
with enhanced resolution of up to 32 bits. Additional bits of
resolution are attained when over sampling by:
where , N = number of bits and 4
DRATIO to the amount of over sampling desired. When using
decimation, the test duration increases with the larger number
of samples taken. The decimated test requires the EVAL-
CONTROL-BRD3.
SERIAL PROGRAMMABLE PORT (AD7610,
AD7612, AD7631, AD7634, AD7951, AD7952)
Figure 23 is a screen showing the flexible serial programmable
port (SPP) used on the AD7610, AD7612, AD7631, AD7634 and
AD7951 iCMOS ADCs. The SPP can be used in any serial mode
and allows the configuration of: unipolar and bipolar input
ranges, mode selection, straight binary or 2’s complement
output coding, and power down. The software demo allows two
different configurations and alternates between these two every
ten samples. To use just one range or mode, simply enter the
same values into both “A” and “B” configuration windows. Note
that when using the unipolar input ranges, a common mode
voltage must be provided externally (DC coupled) as the board
is configured with the common mode = 0V.
f
OVERSAMPLE
=
4
Preliminary Technical Data
N
f *
SAMPLE
N
.= the DRATIO. Set the