ADA4571R-EBZ User Guide

UG-739

HOW TO USE THE SOFTWARE

STARTING UP THE EVALUATION GUI

For maximum performance when the evaluation board is first

powered up, control both the motor and the board using an

external bench power supply. The jumper settings for P9 and

P10 should be set for Ext Motor and Ext +5V as indicated on

the board.

Plug the positive supply for the board into the red terminal, P7,

on the motherboard. This terminal requires 6 V to 12 V which

is then regulated to 5 V on the motherboard using the on-board

ADP3336. This supply powers both the on-board ADC, AD7866,

as well as the daughter board containing the ADA4571.

Plug the positive supply for the motor into the blue terminal,

P6, on the motherboard. Due to mechanical nonlinearities of

the dc motor, such as cogging during coil commuting, extra

errors are introduced to the system at higher rotational

velocities. For best performance, apply 3 V to Ext Motor

terminal. If the motor supplied is a brushless dc motor; 3 V

results in rotational speeds of approximately 2,000 RPM. Speeds

up to 10,000 RPM are possible with a supply voltage of 12 V

applied to this terminal. If the motor supplied is a brushed dc

motor, 3 V results in rotational speeds of approximately

200 RPM.

The nonidealities of the motor result in a higher reported

nonlinearity of the device. This is an artifact of the motor

and not the ADA4571. With an ideal magnetic stimulus, the

ADA4571 has the same angular error performance regardless

of rotational velocity.

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