Analog Devices AD7400A Evaluation Board EVAL-AD7400AEDZ EVAL-AD7400AEDZ Datenbogen
Produktcode
EVAL-AD7400AEDZ
EVAL-AD7400A/AD7401A
Rev. 0 | Page 4 of 16
Link No.
Function
J13
This link selects the AD797 (U3) to buffer the analog input from the J3 SMB.
In Position A, the analog input signal supplied to the J3 SMB connector is fed directly to the AD797 (U3) for
buffering. This link option should be used in conjunction with J14, which should be placed in Position A.
In Position B, the analog input signal supplied to the J3 SMB connector is fed directly to the V
buffering. This link option should be used in conjunction with J14, which should be placed in Position A.
In Position B, the analog input signal supplied to the J3 SMB connector is fed directly to the V
IN
+ input of the
AD7400A and AD7401A, therefore it is not buffered. This link option should be used in conjunction with J14,
which should be placed in Position B.
which should be placed in Position B.
J14
This link option selects the source of the V
IN
− analog input to the AD7400A or AD7401A.
In Position A, the V
IN
− analog input to the AD7400A or AD7401A is buffered by the AD797 (U3). This link option
should be used in conjunction with J13, which should be placed in Position A.
In Position B, the V
In Position B, the V
IN
− analog input to the AD7400A or AD7401A is not buffered by the AD797 (U3). This link option
should be used in conjunction with J13, which should be placed in Position B.
In Position C, the V
In Position C, the V
IN
− analog input to the AD7400A or AD7401A is tied directly to GND
1
.
MCLKOUT/MCLKIN
This is a solder link that selects the destination of MCLKOUT for the AD7400A and the source of MCLKIN for the AD7401A.
In Position A, the MCLKOUT/MCLKIN pin of the AD7400A or AD7401A is tied directly to GND
2
.
In Position B, the MCLKOUT/MCLKIN pin of the AD7400A or AD7401A is connected directly to J7, that is, the signal is
received/supplied by either the EVAL-CED1Z or an external source via the J5 SMB socket.
received/supplied by either the EVAL-CED1Z or an external source via the J5 SMB socket.
MDAT
This is a solder link that selects the destination of the MDAT for the AD7400A or AD7401A.
In Position A, the MDAT pin of the AD7400A or AD7401A is tied directly to GND
2
.
In Position B, the MDAT pin of the AD7400A or AD7401A is connected directly to J8, that is, the signal is received by
either the EVAL-CED1Z or an external source via the J6 SMB socket.
either the EVAL-CED1Z or an external source via the J6 SMB socket.
Table 2. Link Positions on the Packaged EVAL-AD7400A/AD7401A
Link No.
Position
Function
J7 A
The MCLKOUT signal from the AD7400A is supplied to the EVAL-CED1Z. The MCLKIN signal from the
AD7401A is supplied by the EVAL-CED1Z.
AD7401A is supplied by the EVAL-CED1Z.
J8
A
The MDAT signal from the AD7400A or AD7401A is supplied directly to the EVAL-CED1Z.
J9 A
The V
DD2
supply (the nonisolated supply) for the AD7400A or AD7401A is supplied by a 3.3 V supply from
an external source via the J4 connector.
J10 B
The V
IN
+ analog input to the AD7400A or AD7401A is not buffered by the AD797 (U2). This link option
should be used in conjunction with J11, which should be placed in Position B.
J11 B
The analog input signal supplied to the J2 SMB is fed directly to the V
IN
+ input of the AD7400A or AD7401A,
thus it is not buffered. This link option should be used in conjunction with J10, which should be placed
in Position B.
in Position B.
J13 B
The analog input signal supplied to the J3 SMB is fed directly to the V
IN
− input of the AD7400A or
AD7401A, thus it is not buffered.
J14 C
The
V
IN
− analog input to the AD7400A or AD7401A is tied directly to AGND.
MCLKOUT/MCLKIN
B
The MCLKOUT/MCLKIN pin of the AD7400A or AD7401A is connected directly to J7.
MDAT
B
The MDAT pin of the AD7400A or AD7401A is connected directly to J8.
SETUP CONDITIONS
Care should be taken before applying power and signals to
the evaluation board. It is necessary to ensure that all links are
positioned correctly for the chosen operating mode. There are
two different modes in which to operate the evaluation board:
operate the board with the EVAL-CED1Z or use the board as a
standalone board.
the evaluation board. It is necessary to ensure that all links are
positioned correctly for the chosen operating mode. There are
two different modes in which to operate the evaluation board:
operate the board with the EVAL-CED1Z or use the board as a
standalone board.
Table 2 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 will be operating with the EVAL-
CED1Z board. The links are set so that the control signals are
supplied by the EVAL-CED1Z. The V
the evaluation board is packaged. When the board is shipped,
it is assumed that the user will be operating with the EVAL-
CED1Z board. The links are set so that the control signals are
supplied by the EVAL-CED1Z. The V
DD1
supply, which is the
supply for the isolated side of the device, must be supplied
by an external source via the J1-1 connector. The V
by an external source via the J1-1 connector. The V
DD2
supply,
which is the supply for the nonisolated side of the device, must
be supplied by 3.3 V from an external source via the J4 connector.
The board is configured to enable the user to supply a single-
ended input signal to the V
be supplied by 3.3 V from an external source via the J4 connector.
The board is configured to enable the user to supply a single-
ended input signal to the V
IN
+ terminal of the ADC while the
V
IN
− terminal of the ADC is connected to GND. The J10, J11,
J13, and J14 links can be modified to enable a differential signal
to be applied to the
to be applied to the
or
inputs if required.
The EVAL-AD7400A/AD7401A is configured to accept analog
input signals directly from the user’s source. Alternatively, the
input signals directly from the user’s source. Alternatively, the
op amps (U2, U3) can be used to buffer the analog
input signals if required.