LMP7312

SNOSB32B – MARCH 2010 – REVISED MARCH 2013

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SPI Registers

MSB

LSB

Gain_1

Gain_0

EN_CL

Null_SW

Hi_Z

Gain_0, Gain_1 bit:Gain Values

Different gains are available in Attenuation Mode or Amplification Mode according to the following Gain Table.

Gain_1

Gain_0

EN_CL

Gain Value (V/V)

0

0

0

0.096

0

1

0

0.192

1

0

0

0.384

1

1

0

0.768

1

0

1

1

1

1

1

2

EN_CL bit:Enable Amplification Mode

This register selects which input pair is processed.

EN_CL

Mode

Description

0

Attenuation Mode

1

Amplification Mode

±IN inputs are processed through the 40k input resistors

NULL_SW bit: Input Offset Nulling Switch Mode

This register selects a mode in which the amplifier is not processing any input but it is configured in unity gain to

allow system level amplifier offset calibration. The Nulling Switch mode is available in both single ended and fully

differential output mode. The LMP7312 in Nulling Switch and fully differential mode has he following

configuration.

NULL_SW

Mode

Description

0

Normal Operation Mode

setting.

1

Nulling Switch Mode

Enables to evaluate the offset of the internal amplifier for system

level calibration

18

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