EVAL-AD7674CBZ Analog Devices Inc, EVAL-AD7674CBZ Datasheet - Page 5

• Manufacturer Part Number: EVAL-AD7674CBZ
• Description: BOARD EVALUATION FOR AD7674
• Manufacturer: Analog Devices Inc
• Series: PulSAR®r

Specifications of EVAL-AD7674CBZ

• Number Of Adc's: 1
• Number Of Bits: 18
• Sampling Rate (per Second): 800k
• Data Interface: Serial, Parallel
• Inputs Per Adc: 1 Differential
• Input Range: 0 ~ 5 V
• Power (typ) @ Conditions: 126mW @ 800kSPS
• Voltage Supply Source: Analog and Digital
• Operating Temperature: -40°C ~ 85°C
• Utilized Ic / Part: AD7674
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Preliminary Technical Data
Table 3. In most applications four supplies are required; ±12V
and +5V for analog, and +5V for digital. On board regulators,
where applicable, are used to reduce the operating voltages to
the correct levels. The analog and digital supplies can be from
the same source however, R27 (typically 20Ω) is required from
AVDD to DVDD. In this configuration, JP9, DVDD selection,
should be left open. Furthermore, the OVDD (ADC digital
output supply) may need to be brought up after the analog +5V
supply. See datasheet for details.
EVALUATION BOARD SETTING FOR BIPOLAR ADC
INPUT CONFIGURATIONS
The AD7610, AD7612, AD7631, AD7634, AD7663, AD7665,
AD7671, and AD7951 can use both unipolar and bipolar
ranges. The available options are +/-10V, +/-5V, +/-2.5V, 0 to
10V, 0 to 5V and 0 to 2.5V (depending on the ADC).
For the AD7663, AD7665 and AD7671 the evaluation board is
set for the ±5V bipolar input range since these ADCs input
ranges are hardware pin strapped. Simple modifications to these
evaluation boards can be made to accommodate the different
input ranges by changing the INA-IND inputs with the available
solder pads.
iCMOS ADCs
For the AD7610, AD7612, AD7631 AD7634 and AD7951, the
evaluation board can use all input ranges since the input range
is controlled by software (or S16 DIP switches in stand-alone
mode).
For operating in unipolar mode for any of the bipolar
evaluation boards it is recommended to use the voltage divider
consisting of (V
This allows a transition noise test without any additional
equipment.
SCHEMATICS/PCB LAYOUT
The EVAL-AD76XXCB is a 4-layer board carefully laid out and
tested to demonstrate the specific high accuracy performance of
the AD76XX-48 device. Figure 2, Figure 3, and Figure 4, shows
the schematics of the evaluation board. The printed circuit
layouts of the board are given in Figure 5 - Figure 10. Note these
layouts are not to scale.
Top side silk-screen - Figure 5
Top side layer - Figure 6
Ground layer - Figure 7
Shield layer - Figure 8
Bottom side layer - Figure 9
Bottom side silk-screen - Figure 10
RUNNING THE EVAL AD76XXCB SOFTWARE
The evaluation board includes software for analyzing the
AD761X, AD762X, AD763X, AD764X, AD765X, AD766X,
AD767X, AD795X, AD67X and AD97x family. The EVAL-
CONTROL-BRDX is required when using the software. The
CM
* R6/(R6+R7)) and (V
CM
* R29/(R29+R60)).
Rev. PrW | Page 5 of 22
software is used to perform the following tests:
The evaluation software described in this document is also
compatible with the following previous generation of high
resolution ADCs.
HARDWARE SETUP
System Requirements
Connect the control board supplied mini plug to the 14V AC
source. Connect the evaluation board to the controller board
and connect the parallel port cable to the evaluation board and
to the PC .
SOFTWARE INSTALLATION
Double-Click on setup.exe from the CD-ROM and follow the
installation instructions. If upgrading the software, the previous
version will first be removed. Thus setup.exe will need to be run
again to install the new version. Reboot the computer.
RUNNING THE SOFTWARE
To run the software, use “Program Files”, “Analog Devices
ADC” “ADC.exe”. The software has four screens as shown in
Figure 11 through Figure 15. For the AD7610, AD7612,
AD7631, AD7634 and AD7951, Figure 16 is a screen showing
the Serial Programmable Port demonstration.
SETUP SCREEN
EVAL AD676EB
EVAL AD677EB
EVAL AD974CB
EVAL AD976CB
EVAL AD976ACB
EVAL AD977CB
EVAL AD977ACB
• Histogram for determining code transition noise (DC)
• Fast Fourier transforms (FFT) for signal to noise ratio
• Decimation (digital filtering)
• Evaluation Board
• Evaluation Control Board 3 (or Board 2, not in production
• AC Power Supply (AC 14V/1A source - can be purchased
• IEEE 1284 Compliant Parallel Port Cable (if not supplied)
• DC source (low noise for checking different input ranges)
• AC source (low distortion)
• Bandpass filter suitable for 16 or 18 bit testing (value based
• PC operating Windows 2000 or XP.
Table 2. Software Compatible Products
(SNR), SNR and distortion (SINAD), total harmonic
distortion (THD) and spurious free dynamic range (SFDR)
any longer)
from ADI)
on signal frequency)
EVAL-AD76XXCB