EVAL-AD7912_15 Datasheet, PDF (5/16 Pages) Analog Devices – Evaluation Board for 1 MSPS, 2-Channel, 12-/10-Bit ADCs

EVALUATION BOARD INTERFACING
Interfacing to the evaluation board is via a 96-way connector, J1. J1
is used to connect the evaluation board to the EVAL-CONTROL-
BRD2 or to another system. The pinout for the J1 connector is
shown in Figure 2, and its pin designations are given in Table 4.
1
A
B
C
1
8
16
24
32
8
16
24
32
Figure 2. Pin Configuration for the 96-Way Connector, J1
Table 3. 96-Way Connector Pin Description
Pin Description
DR0 Data Receive Zero. Serial data from the
AD7912/AD7922 is provided at this output. Sixteen bits
of data are provided with two leading 0s, a channel
identifier bit and a mode bit, followed by 12 bits of
conversion data provided MSB first (for the AD7922).
See AD7912/AD7922 data sheet.
DT0 Data Transmit Zero. Serial data from the DSP is provided
at this pin. The third and fourth MSB bits from the 16-bit
word are used by the ADC; the remaining bits are ignored.
TFS0 Transmit Frame Sync Zero.
RFS0 Receive Frame Sync Zero. Both of these inputs, TRS0
and RFS0, are connected to the AD7912/AD7922 CS pin
to initiate conversions and to frame the serial data transfer.
SCLK0 Serial Clock Zero. This continuous clock is connected to
the SCLK pin of the AD7912/AD7922 via LK13 to obtain
serial data from the AD7912/AD7922.
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.
AVDD Analog +5 V Supply. These lines are connected to the
AVDD supply line on the board via LK12.
+12 V +12 V Supply. This line is connected to the +12 V supply
line on the board via LK10.
−12 V −12 V Supply. This line is connected to the −12 V supply
line on the board via LK11.
EVAL-AD7912/AD7922
Table 4. 96-Way Connector Pin Designations¹
ROW A
ROW B
ROW C
1
2
3
4
DGND
DGND
DGND
5
DT0
DR0
6
TFS0
RFS0
7
SCLK0
SCLK0
8
9
10
11
12
DGND
DGND
DGND
13
14
15
16
DGND
DGND
DGND
17
18
19
20
DGND
DGND
DGND
21
AGND
AGND
AGND
22
AGND
AGND
AGND
23
AGND
AGND
AGND
24
AGND
AGND
AGND
25
AGND
AGND
AGND
26
AGND
AGND
AGND
27
AGND
28
AGND
29
AGND
AGND
AGND
30
−12 V
AGND
+12 V
31
32
AVDD
AVDD
AVDD
1 _{The unused pins of the 96-way connector are not shown.}
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