AD5520 datasheet(23/25 Pages) AD

23 / 25 page

AD5520

Rev. B | Page 22 of 24

EVALUATION BOARD FOR THE AD5520

A full-featured evaluation kit is available for the AD5520. It

includes an evaluation board with direct hookup via a 36-way

Centronics connector to a PC. PC-based software to control the

AD5520 is also part of the evaluation kit. The evaluation board

schematic is shown in Figure 28.

Note that VDD and VSS must provide sufficient headroom for the

force and measure voltage range. In addition to the supply

voltages for the evaluation board, it is necessary to provide the

voltage levels for the clamp, comparator, and the force input

pins (CLL, CLH, CPL, CPH, and FIN). SMB connections are

provided for these voltage inputs. To use the evaluation board, it

is also necessary to provide a DUT connected via the gold pins.

Both AGND and DGND inputs are provided on the board. The

AGND and DGND planes are connected at one location close

to the AD5520. It is recommended not to connect AGND and

DGND elsewhere in the system to avoid ground loop problems.

REFGND is routed back to AGND at the power block to

maintain a clean ground reference for accurate measurements.

Each supply is decoupled to the relevant ground plane with

10 μF and 0.1 μF capacitors. The device supply pin is again

decoupled with a 10 μF and 0.1 μF capacitor pair to the relevant

ground plane.

Care should be taken when replacing devices to ensure that the

pins line up correctly with the PCB pads.

AD5520 Datasheet(PDF) 23 Page - Analog Devices