Datasheet

OA Registers www.ti.com
20.3.2 OAxCTL1, Opamp Control Register 1
7 6 5 4 3 2 1 0
OAFBRx OAFCx OANEXT OARRIP
rw-0 rw-0 rw-0 rw-0 rw-0 rw-0 rw-0 rw-0
OAFBRx Bits 7-5 OAx feedback resistor select
000 Tap 0 - 0R/16R
001 Tap 1 - 4R/12R
010 Tap 2 - 8R/8R
011 Tap 3 - 10R/6R
100 Tap 4 - 12R/4R
101 Tap 5 - 13R/3R
110 Tap 6 - 14R/2R
111 Tap 7 - 15R/1R
OAFCx Bits 4-2 OAx function control. This bit selects the function of OAx
000 General purpose opamp
001 Unity gain buffer for three-opamp differential amplifier
010 Unity gain buffer
011 Comparator
100 Non-inverting PGA amplifier
101 Cascaded non-inverting PGA amplifier
110 Inverting PGA amplifier
111 Differential amplifier
OANEXT Bit 1 OAx inverting input externally available. This bit, when set, connects the inverting OAx input to the external
pin when the integrated resistor network is used.
0 OAx inverting input not externally available
1 OAx inverting input externally available
OARRIP Bit 0 OAx reverse resistor connection in comparator mode
0 R
TOP
is connected to AV
SS
and R
BOTTOM
is connected to AV
CC
when OAFCx = 3
1 R
TOP
is connected to AV
CC
and R
BOTTOM
is connected to AV
SS
when OAFCx = 3.
522
OA SLAU144J–December 2004–Revised July 2013
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