ADSP-CM403F EZ-KIT Lite Evaluation System Manual
2-15
ADSP-CM403F EZ-KIT Lite Hardware Reference
VREF0 External Source Jumper (JP1)
The
VREF0
external source jumper (
JP1
) selects whether an internal or
external voltage reference supplies the
VREF0
signal of the processor. When
a jumper on
JP1
is not installed (default), the internal voltage reference
supplies
VREF0
. When a jumper on
JP1
is installed, the external Analog
Devices ADR441 ultra-low noise voltage reference (
U6
) supplies
VREF0
.
Configure the processor’s registers accordingly for the latter case.
VREF1 External Source Jumper (JP2)
The
VREF1
external source jumper (
JP2
) selects an internal or external volt-
age reference supply to the
VREF1
signal of the processor. When a jumper
on
JP2
is not installed (default), the internal voltage reference supplies
VREF1
. When a jumper on
JP2
is installed, the external Analog Devices
ADR441 ultra-low noise voltage reference (
U2
) supplies
VREF1
. Configure
the processor’s registers accordingly for the latter case.
Buffer Input Select Jumper (JP3)
The buffer input select jumper (
JP3
) selects the input to the ADA4889
unity gain op amp buffer (
U22
). The processor’s internal input is selected
by placing a jumper on pins 1 and 2 of
JP3
(default).
The external
VREF0
input, supplied by the Analog Devices ADR441
ultra-low noise voltage reference (
U6
), is selected by placing a jumper on
pins 2 and 3 of
JP3
.
