How To Use The Software; Starting Up The Evaluation Gui - Analog Devices ADA4571 User Manual

ADA4571R-EBZ User Guide

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.
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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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