UG-484
EVAL-ADAS3022EDZ User Guide
Rev. A | Page 6 of 32
JUMPERS AND TEST POINTS
Three-pin jumpers are used to configure the ADC reference. Refer to the Reference section for further details and settings.
Table 4. Pin Jumper Descriptions
Jumper Default
Function
P5
REFIN to
GND
REFIN Select. Buffered reference input selection. Use in conjunction with P7.
Note that the
ADAS3022
REFx pin and any other circuit traces/test points will produce 4.096 V when using the
buffered reference configuration; P7 must be left in the open position.
REFIN to A2: Uses the on-board
ADR381
, A2 (2.5 V) reference. The
ADAS3022
must use the buffered reference
configuration.
REFIN to GND: Disables the
ADAS3022
internal reference. The
ADAS3022
must use the full external reference
configuration.
Open: For use either when using the
ADAS3022
on-chip reference or when applying an external 2.5 V source. When
using the on chip reference, a voltage is present on Pin 2 and any other circuit traces/test points. When using an
external source, the
ADAS3022
must use the buffered reference configuration.
P7
REF to
BUF
REF Select. External 4.096 V reference input selection. Use in conjunction with P5. Note that the
ADAS3022
REFIN
pin and any other circuit traces/test points produce 2.5 V when using the internal or external reference
configuration and P5 must be left in the open position.
REF to A1: Uses the on-board
ADR434
, A1 (4.096 V), reference. The
ADAS3022
must use the external reference
configuration.
REF to BUF: Uses the on-board
ADR434
followed by the
AD8032
, U20 unity gain buffer. This allows some adjustment
to the reference voltage by use of some resistors around the
AD8032
. The
ADAS3022
must use the external
reference configuration.
Open: For use when using the
ADAS3022
on-chip reference or an externally applied source connected directly to
Pin 2 or the REF test point.
P31
COM to
PIN 1
COM Input Select. Center pin connected to
ADAS3022
COM pin. Center pin to PIN1 routes COM to P1. Center to
PIN3 routes COM to GND.
Solder pads jumpers are factory configured and can be changed by the user.
Table 5. Analog and Digital Solder Pads Descriptions
Jumper
Name
Default
Function
P9
SDO
1 to 3
SDO Interface Select. Pad 1 to Pad 3 for FPGA; Pad 2 to Pad 3 for P3 to P34.
P16
DIN
1 to 3
DIN Interface Select. Pad 1 to Pad 3 for FPGA; Pad 2 to Pad 3 for P3 to P35.
P17
CNV
1 to 3
CNV Interface Select. Pad 1 to Pad 3 for FPGA; Pad 2 to Pad 3 for P3 to P36.
P18
SCK
1 to 3
SCK Interface Select. Pad 1 to Pad 3 for FPGA; Pad 2 to Pad 3 for P3 to P33.
P19
BUSY
1 to 3
BUSY Interface Select. Pad 1 to Pad 3 for FPGA; Pad 2 to Pad 3 for P3 to P37.
P27
RESET
1 to 3
RESET Interface Select. Pad 1 to Pad 3 for FPGA; Pad 2 to Pad 3 for P3 to P38.
P28
PD
1 to 3
PD Interface Select. Pad 1 to Pad 3 for FPGA; Pad 2 to Pad 3 for P3 to P39.
P29
CS
1 to 3
CS Interface Select. Pad 1 to Pad 3 for FPGA; Pad 2 to Pad 3 for P3 to P40.
P25
DSPCLK
Soldered
CED Clock Source.
