Datasheet

PmodDA1™ Reference Manual
Copyright Digilent, Inc. All rights reserved.
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Page 3 of 3
Bite Name
Description
~INT/EXT
Selects between the internal and external voltage reference
X
Don't care
LDAC
Load DAC bit to both load and update the DAC outputs
PDB
Power-down DAC B
PDA
Power-down DAC A
~A/B
Selects either DAC A or DAC B to process the data
CR1
Works with CR0 as per the Control Bits Truth Table below
CR0
Works with CR1 as per the Control Bits Truth Table below
Data
The user submitted data where DB7 is the MSB and DB0 is the LSB
Table 3. Bit descriptions.
LDAC
~A/B
CR1
CR0
Resulting Operation
0
X
0
0
Both DAC registers loaded from the shift register
0
0
0
1
Update DAC A register from the shift register
0
1
0
1
Update DAC B register from the shift register
0
0
1
0
Update DAC A DAC register from the input register
0
1
1
0
Update DAC B DAC register from the input register
0
0
1
1
Update DAC A DAC register from the shift register
0
1
1
1
Update DAC B DAC register from the shift register
1
0
X
X
Load DAC A input register from the shift register and update both DAC
registers
1
1
X
X
Load DAC B input register from the shift register and update both DAC
registers
Table 4. Control bits truth table.
PDA
PDB
Description
0
0
Both DACs are active
0
1
DAC A is active and DAC B is in power-
down mode
1
0
DAC B is active and DAC is in power-
down mode
1
1
Both DACs are in power-down mode
~INT/EXT
Description
0
Internal Vdd/2 reference
voltage selected
1
External reference voltage
selected
Table 5. Another truth table compiled from the AD7303 datasheet.
3 Physical Dimensions
The pins on the pin header are spaced 100 mil apart. The PCB is 1 inch long on the sides parallel to the pins on the
pin header and 0.8 inches long on the sides perpendicular to the pin header.