UG-739

ADA4571R-EBZ User Guide

EVALUATION BOARD HARDWARE

The ADA4571 end of shaft demo evaluation system comprises

of two boards (ADA4571 motherboard and ADA4571 daughter

board) and a brushless dc motor.

The ADA4571 evaluation system can be powered directly

from the host PC USB or from an external bench supply. For

maximum performance, it is recommended that an external

bench power supply be used.

When supplied directly from the host PC USB, the applied

voltage is approximately 5 V. However, due to errors in the

regulated USB voltage this value will vary and introduce extra

errors into the system.

To power the motherboard by an external bench supply, apply

6 V to 12 V to P7, the red terminal. When supplied by an

external bench supply, the applied voltage is regulated to 5 V

on the motherboard resulting in a better performance than

powering directly from the host PC USB. If the bench supply

features current-limiting, it is recommended to set the current

limit to 100 mA, as a precaution.

To power the motor by an external bench supply, 3 V to 9 V can

be applied to P6, the blue terminal. The ground is shared with

the ground of the motherboard. The speed of the brushless dc

motor providing the magnetic stimulus to the ADA4571 is

proportional to the voltage applied at this terminal. The

attached motor provides a more constant rotational speed at

lower applied voltages. Due to the LabVIEW GUI measuring

the linearity of the outputs from the device, a more constant

rotational speed is necessary to see the true performance of the

ADA4571. See the Angular Error (Linearity) section for more

information on motor performance.

JUMPER CONFIGURATION

Refer to the ADA4571 motherboard schematic (see Figure 15)

or the configuration panel to understand the purpose of each

jumper.

Configure the motherboard default jumper as follows (see

Figure 15):

•

Install the P9 and P10 jumpers in the standard position to

connect the motor and board power to the external supply

terminals.

•

Install the P3 jumper connecting GC to VDD. This enables

the gain control mode of the part. When P3 connects GC

to GND, gain control mode is disabled.

•

Install the P2 jumper connecting PD to GND. This disables

the power-down mode of the part. When P2 connects PD

to VDD, power-down mode is enabled and the ADA4571

outputs are put into a high impedance state.

DUT OUTPUTS

The outputs of the ADA4571 may be monitored at the test

points located on the daughter board or the motherboard. The

VSIN, VCOS, and VTEMP pins are all accessible on both of the

boards.

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