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Figure 30.11. Dual Buffer ADC Driver Overview
VIP
+
-
R1
R2
VOUTP= VIP(1+ R2/R1)
or
VOUTP = VIP (Unit y Gain)
VIN
+
-
R1
R2
VOUTN= VIN(1+ R2/R1)
or
VOUTN = VIN (Unit y Gain)
Table 30.11. Dual Buffer ADC Driver Configuration
OPA
OPA0
OPA0
OPA0
OPA1
OPA1
OPA1
OPA bit-fields
POSSEL
NEGSEL
RESINMUX
POSSEL
NEGSEL
RESINMUX
OPA Configuration
POSPAD0
OPATAP
VSS
POSPAD1
OPATAP
VSS
30.3.3 Opamp DAC Combination
Since two of the opamps are part of the DAC it is not possible to use both DAC channels and all three
opamps at the same time. If both DAC channels are used, only OPA2 is available out of the 3 opamps.
However, it is possible to use one of the DAC channels in combination with OPA0/OPA1. OPA1 is
available when DAC channel 0 is in use and OPA0 is available when DAC channel 1 is used. When using
the opamp DAC combination, the DAC CONVMODE can only be configured to either CONTINUOUS
or SAMPLEHOLD mode. The CONVMODE bitfield can be configured in DACn_CTRL register. In the
opamp/DAC combination, the DAC channel enabled is configured through the DAC registers while the
opamp is controlled through the opamp registers.
30.4 Register Description
The register description of the opamp can be found in Section 29.4 (p. 710) in the DAC chapter.
30.5 Register Map
The register map of the opamp can be found in Section 29.4 (p. 710) in the DAC chapter.
2013-05-08 - Wonder Gecko Family - d0233_Rev0.50
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