UG-549
ADuCM310 Hardware Reference Manual
Rev. C | Page 46 of 192
VDACs
VDAC FEATURES
The
has eight VDACs. Four of the VDACs are fully supported on the low voltage analog die. The other four VDACs are
supported by the main DAC structure on the low voltage analog die with the output buffer circuits implemented on the high voltage
analog die. All eight VDACs are capable of driving a 10 nF load.
VDAC BLOCK DIAGRAM
V
REF
STRING DAC
DAC
BUFFER
DACOUT
R
LOAD
C
LOAD
DACxCON[10:9] = 11
1
1461-
0
1
1
Figure 11. Normal Mode, C
LOAD
= 10 nF || R
LOAD
≥ 75 Ω, 3 V Full Scale (All VDACs)
V
REF
DAC_BUF
DACOUT
DACxCON[10:9] = 00
STRING DAC
1
1461-
012
Figure 12. Output Mode Cap Load ≤100 pF (Low Voltage Die Only; VDAC0, VDAC1, VDAC4, and VDAC5)
VDAC OVERVIEW
The
has eight VDACs. Four of the VDACs are fully supported on the low voltage analog die. The other four VDACs are
supported by the main DAC structure on the low voltage analog die with the output buffer circuits implemented on the high voltage
analog die. All eight VDACs are capable of driving a 10 nF load.
•
VDAC0/VDAC1: 0 V to 3 V full-scale output, specified to drive a 75 Ω load, 40 mA maximum. Only the low voltage die is required.
These VDACs can select from two reference sources:
•
0 V to internal reference, V
REF
(0 V to 2.5 V)
•
0 V to AV
DD
(3.3 V)
•
When DAC0CON and DAC1CON[10:9] = 11b, a gain of 1.2 is applied on the DAC output buffer.
•
VDAC2/VDAC3: −5 V to 0 V full-scale output, specified to drive a 500 Ω load, 10 mA maximum. Low voltage die and high voltage
die required to fully support. The
provides a gain of −2.25. Note that the absolute maximum AV
NEG
voltage is −5.5 V.
•
VDAC4/VDAC5: 0 V to 3 V full-scale output, specified to drive a 300 Ω load, 10 mA maximum. Only the low voltage die is required.
These VDACs can select from two reference sources:
•
0 V to internal reference, V
REF
(0 V to 2.5 V)
•
0 V to AV
DD
(3.3 V)
•
When DAC4CON and DAC5CON[10:9] = 11b, a gain of 1.2 is applied on the DAC output buffer.
•
VDAC6: 0 V to 5 V full-scale output, specified to drive a 500 Ω load, 10 mA maximum. Low voltage die and high voltage die
required to fully support.
•
VDAC7: 0 V to 5 V full-scale output, specified to drive a 100 Ω load, 50 mA maximum. Low voltage die and high voltage die
required to fully support.