EVAL-AD974CB Analog Devices Inc, EVAL-AD974CB Datasheet - Page 3

• Manufacturer Part Number: EVAL-AD974CB
• Description: BOARD EVAL FOR AD974
• Manufacturer: Analog Devices Inc

Specifications of EVAL-AD974CB

• Rohs Status: RoHS non-compliant
• Number Of Adc's: 1
• Number Of Bits: 16
• Sampling Rate (per Second): 200k
• Data Interface: Serial
• Inputs Per Adc: 4 Single Ended
• Input Range: ±10 V
• Power (typ) @ Conditions: 120mW @ 200kSPS
• Voltage Supply Source: Analog and Digital
• Operating Temperature: -40°C ~ 85°C
• Utilized Ic / Part: AD974
• Lead Free Status / RoHS Status: Not Compliant

Windows is a registered trademark of the Microsoft Corporation.
Jumper
Designation
JP1
JP2
JP3
JP4
JP5
JP6
JP7
JP8
JP9
JP10
JP11, JP12
JP13
EVAL-CONTROL BOARD Interface
The EVAL-AD974CB interfaces to the EVAL-CONTROL
BOARD through the 96-pin connector.
RUNNING THE EVAL-AD974CB SOFTWARE
Software Description
The EVAL-AD974CB comes with software for analyzing the
AD974. Through the EVAL-CONTROL BOARD one can
perform a histogram to determine code transition noise, and
Fast Fourier Transforms (FFT’s) to determine the Signal to
Noise Ratio (SNR), Signal to Noise plus Distortion (SNRD)
and Total Harmonic Distortion (THD). The front-end PC
software has three screens as shown in Figures 8, 9 and 10.
Figure 8 is the Setup Screen where channel selection, input
voltage range, sample rate, number of samples are selected.
Figure 9 is the Histogram Screen, which allows the code distri-
bution for dc input and computes the mean and standard
deviation. Figure 10 is the FFT Screen, which performs an
FFT on the captured data, computes the Signal-to-Noise
Ratio (SNR), Signal to Noise plus Distortion (SNRD) and
Total Harmonic Distortion (THD).
With JP10 set to Position A, gain adjustment for the AD974 is possible. Position B selects the AD780 for use as an
With JP13 tied to Position A, the analog Channel 1 input comes from either the analog signal source (AIN1) from
Function
JP1 controls the state of the AD974 power-down pin, PWRD. With JP1 in Position B, conversions are inhibited
and the AD974 power consumption is significantly reduced. For normal operation of the AD974, JP1 should be in
Position A.
JP2 selects the EXT/INT input to the AD974. Set JP2 to Position B and the AD974 requires an external data
clock to transmit data. Position A chooses the internal clock mode.
JP3 allows use of an external DCLK. When J2 is in Position A, internal clock mode is used and JP3 should be
removed. When J2 is in Position B, external clock mode is used and the signal EXT DCLK from BNC connector,
J2 is applied to the DCLK input of the AD974.
With JP5 set to Position A, JP4 selects the signal source for the R/C input to the AD974. Set JP4 to Position A to
use the on-board 200 kHz signal from the 74HC190. Select Position B to use the external R/C signal from the
BNC connector, J1.
With JP5 in Position A, the R/C input to the AD974 is applied from either the 74HC190 or the external source,
J1. With JP5 in Position B, the R/C input is a buffered signal (FL0) from the EVAL-CONTROL BOARD and an
input from the 20-pin IDC connector.
JP6 selects the WR2 input to the AD974. With shunt header in JP6, the AD974 WR2 input is tied to a logic low.
When shunt header in JP6 is removed, the AD974 WR2 input comes from the 20-pin IDC connector.
JP7 selects the WR1 input to the AD974. With shunt header in JP7, the AD974 WR1 input is tied to a logic low.
When shunt header in JP7 is removed, the AD974 WR1 input comes from the 20-pin IDC connector.
JP8 selects the CS input to the AD974. With shunt header in JP8, the AD974 CS input is tied to a logic low.
When shunt header in JP8 is removed, the AD974 CS input comes from the 20-pin IDC connector.
JP3 allows use of an external read clock, EXT RCLK. With shunt header in JP9, the AD974 BUSY signal enables
the data reading. When shunt header in JP9 is removed, the signal EXT RCLK from BNC connector, J5 enables
the data reading.
external reference. Remove the shunt header of JP10 to use the AD974 internal reference without gain adjustment.
These TWO jumpers set the analog input ranges for Channel 1 according to Table I through Table III.
J3, or the output of the op amp, U3. Set to Position B, the analog input is tied to analog ground.
Table V. Jumper Description
Software Installation
The AD974-CB software runs under DOS 4.0 or higher. It
requires a minimum of 386-based machine, with 500 kB of base
RAM and 500 kB of free hard disk space. It may be necessary to
disable some TSRs (network TSRs for example) or load them
into high memory, to ensure that adequate base memory is avail-
able. Operation under Windows
the Windows COM interrupt can interfere with communication
between the PC and the EVAL-CONTROL BOARD. For PC
running under Windows 95, it is recommended to shut it down
using the option restart with the computer in MS-DOS mode.
The AD974-CB software installation process is:
– Create a new directory on the main PC drive and label this
– Copy into this directory all files contained in the disk that
– The software can be started by typing “AD974.”
Note that the Mouse Driver on the PC should be enabled
before running the software. If this has not been loaded,
the program will not run.
“AD974.”
accompanies the EVAL-AD974CB.
®
3.x is not recommended since
EVAL-AD974CB