42.5.2 OPAxCON1

Operational Amplifier Control Register 1

Name:	OPAxCON1
Address:	0xA4


Bit	7	6	5	4	3	2	1	0
		GSEL[2:0]			RESON	NSS[2:0]
Access		R/W	R/W	R/W	R/W	R/W	R/W	R/W
Reset		0	0	0	0	0	0	0

Bits 6:4 – GSEL[2:0] Operational Amplifier Gain Selection

Table 42-2. Operational Amplifier Internal Resistor Ladder Selections
GSEL[2:0]	R1	R2	Inverting (R2/R1)	Noninverting (1 + R2/R1)
`111`	1R	15R	15	16
`110`	2R	14R	7	8
`101`	4R	12R	3	4
`100`	6R	10R	5/3	8/3
`011`	8R	8R	1	2
`010`	12R	4R	1/3	4/3
`001`	14R	2R	1/7	8/7
`000`	15R	1R	1/15	16/15
Note: R = 20 kΩ nominal

Bit 3 – RESON Resistor Ladder Enable

Value	Description
1	Internal Resistor Ladder is enabled; OPA input is connected to the resistor ladder allowing GSEL to be used to control programmable gain.
0	Internal Resistor Ladder is disabled. External feedback to the OPA is required unless operating in Unity Gain mode.

Bits 2:0 – NSS[2:0] Negative Source Selection


Value	Description
`111`	V_SS
`110`	Reserved
`101`	Reserved
`100`	Reserved
`011`	OPAxIN3-
`010`	OPAxIN2-
`001`	OPAxIN1-
`000`	OPAxIN0-

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