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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