EVAL-AD7470CB Datasheet, PDF (4/14 Pages) Analog Devices – Evaluation Board for 10-bit high speed, low power, successive-approximation ADC

EVAL-AD7470CB
EVAL-CONTROL BOARD INTERFACING
Interfacing to the EVAL-CONTROL BOARD is via a 96-
way connector, J1. The pinout for the J1 connector is shown
in Figure 2 and its pin designations are given in Table II.
1
32
A
B
C
1
32
Figure 2. Pin Configuration for the 96-Way
Connector, J1
96-Way Connector Pin Description
D0-D11 Data Bit 0 to Data Bit 11. Three-state TTL
outputs. D11 is the MSB.
SCLK0
Serial Clock Zero. This continuous clock can be
connected to the CLKIN pin of the AD7470 via
LK3.
+5VD
Digital +5 V supply. This can be used to provide
a separate +5 V supply for the digital logic if
required via LK2.
RD
Read. This is an active low logic input connected
to the RD pin of the AD7470 via LK5.
CS
Chip Select. This is an active low logic input
connected to the CS pin of the AD7470 via LK6.
FL0
Flag zero. This logic input is connected to the
CONVST input of the AD7470 via LK4.
IRQ2
Interrupt Request 2. This is a logic output and is
connected to the BUSY logic output on the
AD7470.
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_SS
Negative Supply Voltage. This provides a nega-
tive supply to the on-board op-amps via LK9.
AV_DD
Positive Supply Voltage. This provides a positive
supply to the op-amps, the reference, the AD7470
and the digital logic.
When interfacing directly to the EVAL-CONTROL BOARD,
all power supplies and control signals are generated by the
EVAL-CONTROL BOARD. However, due to the nature of
the DSP interface on the EVAL-CONTROL BOARD,
AD7470 sampling rates greater than 400 KHz are not
supported when interfacing the EVAL-AD7470CB directly
to the EVAL-CONTROL BOARD. To achieve sample rates
greater than 400 KHz, the HSC-INTERFACE BOARD
must be used. The HSC-INTERFACE BOARD is a board
designed to interface between evaluation boards for high
speed analog-to-digital converters and the EVAL-CON-
TROL BOARD. It can be ordered from Analog Devices
through the normal channels using the part number "HSC-
INTERFACE BOARD".
Table II. 96-Way Connector Pin Functions.
ROW A
1
2
3
4
DGND
5
6
7
SCLK0
8
+5VD
9
RD
10
11
12 DGND
13
14
15
16 DGND
17 FL0
18
19
20 DGND
21 AGND
22 AGND
23 AGND
24 AGND
25 AGND
26 AGND
27
28
29 AGND
30
31 AVSS
32 AVDD
ROWB
D0
D1
DGND
D2
D3
D4
+5VD
D5
D6
D7
DGND
D8
D9
D10
DGND
D11
DGND
AGND
AGND
AGND
AGND
AGND
AGND
AGND
AGND
AGND
AGND
AVSS
AVDD
ROWC
DGND
SCLK0
+5VD
CS
DGND
DGND
IRQ2
DGND
AGND
AGND
AGND
AGND
AGND
AGND
AGND
AVSS
AVDD
Note : The unused pins of the 96-way connector are not shown.
–4–
REV. 0