EVAL-AD7898CB Datasheet, PDF (4/13 Pages) Analog Devices – Evaluation Board for 5V, 12-Bit, Serial 220kSPS ADC in 8-Pin Package

EVAL-AD7898CB
EVALUATION BOARD INTERFACING
Interfacing to the evaluation board is via a 96-way connec-
tor, J1. J1 is used to connect the evaluation board to the
EVALUATION-BOARD CONTROLLER or other sys-
tems. The pinout for the J1 connector is shown in Figure
1 and its pin designations are given in Table II.
It is important to note that the evaluation board is set-up
for Mode 1 operation only. This means that the
CONVST/CS will always be CS ( see AD7898 datasheet -
modes of operation section).
1
32
A
B
C
1
32
Figure 1. Pin Configuration for the 96-Way
Connector, J1
96-Way Connector Pin Description
DR0
DATA RECEIVE ONE: Serial Data from the
AD7898 is provided at this output. Sixteen bits of
data are provided with four leading zeroes fol-
lowed by twelve bits of conversion data which is
provided MSB first.
SCLK0
SERIAL CLOCK ZERO: This continuous clock
is connected to the SCLK pin of the AD7898 via
LK7 to obtain serial data from the AD7898.
TFS0 TRNSMIT FRAME SYNC ZERO,
RFS0
RECEIVE FRAME SYNC ZERO: Both of these
inputs are conncected to the AD7898 CS/
CONVST pin via LK5 to initiate conversions
and to frame the serial data tansfer.
DGND
Digital Ground. These lines are connected to
the digital ground plane on the evaluation
board. It allows the user to provide the digital
supply via the connector along with the other
digital signals.
AGND
Analog Ground. These lines are connected to
the analog ground plane on the evaluation
board.
AV_DD
+12V
Analog +5V Supply. These lines are connected
to the AV_DD supply line on the board via LK4.
+12V Supply. This line is connected to the +12V
supply line on the board via LK8.
-12V
-12V Supply. This line is connected to the -12V
supply line on the board via LK9.
Table II. 96-Way Connector Pin Functions.
ROW A
1
2
3
4
DGND
5
6
TFS0
7
SCLK0
8
9
10
11
12 DGND
13
14
15
16 DGND
17
18
19
20 DGND
21 AGND
22 AGND
23 AGND
24 AGND
25 AGND
26 AGND
27
28
29 AGND
30 -12V
31
32 AVDD
ROWB
DGND
DGND
DGND
DGND
AGND
AGND
AGND
AGND
AGND
AGND
AGND
AGND
AGND
AGND
AVDD
ROWC
DGND
DR0
RFSO
SCLK0
DGND
DGND
DGND
AGND
AGND
AGND
AGND
AGND
AGND
AGND
+12V
AVDD
Note : The unused pins of the 96-way connector are not shown.
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REV. 0