Datasheet

EVAL-AD7262/AD7264
Rev. 0 | Page 5 of 20
SETUP CONDITIONS
Care should be taken before applying power and signals to the
evaluation board to ensure that all link positions are as per the
required operating mode. There are two different modes in which
to operate the evaluation board. Either the user can operate the
board with the EVAL-CED1Z or it can be used as a standalone
board. The board can accept differential analog input voltages.
Table 2 and Table 3 shows the position in which all the links are
set when the evaluation board is packaged. When the board is
shipped, it is assumed that the user is operating with the EVAL-
CED1Z board. The links are set so that all power supplies and
control signals are supplied by the EVAL-CED1Z. The board is
configured to enable the user to supply a differential input
signal directly to the device for both ADCs. Each ADC on
the AD7262 or AD7264 is preceded by an internal PGA,
which implies that no external buffers are required on the
analog input. Accordingly, it is recommended that the
AD7262 or AD7264 analog inputs be driven directly with
a differential signal.
The EVAL-AD7262/AD7264 is configured to use an external
reference with differential analog inputs directly from the user’s
source.
Table 2. Link Positions on the Packaged EVAL-AD7262/AD7264
Link No. Position Function
LK1 B The AD780 supplies an external reference to the AD7262 or AD7264 through V
REF
A.
Lk2 B The AD780 supplies an external reference to the AD7262 or AD7264 through V
REF
B.
LK3 B REFSEL is tied to ground (low logic state). Thus, an external reference is selected.
LK4 A The V
DRIVE
supply is supplied from the EVAL-CED1Z. The EVAL-CED1Z can supply this pin with 3.3 V only.
LK5 A The AV
CC
supply for the AD7262 or AD7264 is supplied by the EVAL-CED1Z board.
LK6 B The logic input to the CAL pin of the AD7262 or AD7264 is supplied from the EVAL-CED1Z.
LK7 B The logic input to the PD0/D
IN
pin of the AD7262 or AD7264 is supplied from the EVAL-CED1Z.
LK8 B The logic input to the PD1 pin of the AD7262 or AD7264 is supplied from the EVAL-CED1Z.
LK9 B The logic input to the PD2 pin of the AD7262 or AD7264 is supplied from the EVAL-CED1Z.
LK10 B The logic input to the G0 pin of the AD7262 or AD7264 is supplied from the EVAL-CED1Z.
Lk11 B The logic input to the G1 pin of the AD7262 or AD7264 is supplied from the EVAL-CED1Z.
LK12 B The logic input to the G2 pin of the AD7262 or AD7264 is supplied from the EVAL-CED1Z.
LK13 B The logic input to the G3 pin of the AD7262 or AD7264 is supplied from the EVAL-CED1Z.
LK14 A +12 V is supplied from the EVAL- CED1Z board.
Table 3. Solder Link Positions on the Packaged EVAL-AD7262/AD7264
Link No. Position Function
SL1 A The AV
CC
supply for the AD7262 or AD7264 is ties to the other AV
CC
supply and thus is supplied by the EVAL-CED1Z.
SL2 A The C
A
_C
B
V
CC
and C
C
_C
D
V
CC
are tied to the AV
CC
supply and thus are supplied by the EVAL-CED1Z.
SL3 A The C
A
_C
B
V
CC
and C
C
_C
D
V
CC
are tied to the AV
CC
supply and thus are supplied by the EVAL-CED1Z.
SL4 A The SCLK signal is supplied directly from the EVAL-CED1Z board through the 96-way connector.
SL5 A
The CS
signal is supplied directly from the EVAL-CED1Z board through the 96-way connector.
R12, R13 Do not insert.