EVAL-AD7484_15 Datasheet, PDF(7/20 Page) Analog Devices – Evaluation Board for 3 MSPS, 14-Bit SAR ADC

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EVAL-AD7484_15 Datasheet, PDF (7/20 Pages) Analog Devices – Evaluation Board for 3 MSPS, 14-Bit SAR ADC

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SOCKETS

There are eight input sockets relevant to the operation of the

AD7484 on this evaluation board. The functions of these

sockets are outlined in Table 5.

Table 5. Socket Functions

Socket Function

Sub-miniature BNC socket for bipolar input signals

that are biased up by the on-board op amps into VIN.

Sub-miniature BNC socket for unipolar input signals

that are connected directly to VIN.

Sub-miniature BNC socket for an external reference.

Sub-miniature BNC socket for an external CONVST

signal.

J10

Sub-miniature BNC socket for an external offset

voltage that is used to bias up the signal applied at J2.

J11

Sub-miniature BNC socket for an external CS signal.

J12

Sub-miniature BNC socket for an external RD signal.

J13

Sub-miniature BNC socket for an external WR signal.

CONNECTORS

There are five connectors on the AD7484 evaluation board,

outlined in Table 6.

Table 6. Connector Functions

Socket Function

96-way connector for parallel interface and power

supply connections.

External VDRIVE connector.

External AVDD and AGND connector.

External DVDD and DGND connector.

External +12 V, â12 V, and AGND power connector.

OPERATING WITH THE EVAL-CONTROL BRD2

The evaluation board can operate in standalone mode or in

conjunction with the EVAL-CONTROL BRD2, which is

available from Analog Devices. When operated with the EVAL-

CONTROL BRD2, all supplies and control signals required to

operate the AD7484 are provided by the EVAL-CONTROL

BRD2. Software to communicate with the control board and the

AD7484 is provided with the AD7484 evaluation board

package. The EVAL-CONTROL BRD2 also operates with all

Analog Devices evaluation boards whose part numbers end

with the letters CB.

EVAL-AD7484

The 96-way connector on the EVAL-AD7484 plugs directly into

the 96-way connector on the EVAL-CONTROL BRD2. The

EVAL-CONTROL BRD2 provides all supplies for the evaluation

board. It is powered from a 12 V ac transformer. Suitable

transformers are available from Analog Devices as accessories

under the following part numbers:

EVAL-110VAC-US: For use in the U.S. or Japan

EVAL-220VAC-UK: For use in the UK

EVAL-220VAC-EU: For use in Europe

These transformers are also available from other suppliers,

including Digi-key (US) and Campbell Collins (UK).

Connection between the EVAL-CONTROL BRD2 and the

parallel port of a PC is via a standard Centronics printer port

cable that is provided as part of the EVAL-CONTROL BRD2

package. See the manual that accompanies the EVAL-CONTROL

BRD2 for more details on the EVAL-CONTROL BRD2

package.

SETTING UP THE EVAL-CONTROL BRD2

The evaluation board software should be installed on the PC,

and the evaluation board and the EVAL-CONTROL BRD2

should be connected, before the EVAL-CONTROL BRD2 is

connected to the PC, as follows:

1. Install the EVAL-AD7484 evaluation board software.

2. Connect the evaluation board and the EVAL-CONTROL

BRD2 via the 96-way connector.

3. Apply power to the EVAL-CONTROL BRD2. At this stage,

the red LED should also be flashing to indicate that the

EVAL-CONTROL BRD2 is functional and ready to receive

instructions.

4. Load the installed software before connecting the printer

port cable to ensure that the printer port is initialized

correctly.

5. Connect the printer port cable between the PC and the

EVAL-CONTROL BRD2.

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