AD5940 datasheet(62/143 Pages) AD

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Data Sheet

AD5940/AD5941

HIGH PERFORMANCE ADC CIRCUIT

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Rev. D | 62 of 143

Table 50. Bit Descriptions for TEMPSENS Register (Continued)

Bits

Bit Name

Settings

Description

Reset

Access

1 Enables chop. If chopping is enabled, take 2× consecutive samples and average the results to obtain

a final temperature sensor channel reading. Chopping reduces the offset error associated with this

channel.

Enable

Unused. Temperature sensor enable. AFECON, Bit 12 overrides this bit.

0x0

R/W

0 Disable temperature sensor.

1 Enable temperature sensor. Temperature sensor enable. AFECON, Bit 12 overrides this bit.

ADC Configuration Register—ADCCON

Address 0x000021A8, Reset: 0x00000000, Name: ADCCON

Table 51. Bit Descriptions for ADCCON Register

Bits

Bit Name

Settings

Description

Reset

Access

[31:29]

Reserved

Reserved.

0x0

[18:16]

GNPGA

PGA gain setup.

0x0

R/W

0 Gain = 1.

1 Gain = 1.5.

10 Gain = 2.

11 Gain = 4.

100 Gain = 9.

101 Gain = 9.

GNOFSELPGA

Internal offset/gain cancellation.

0x0

R/W

0 DC offset cancellation disabled.

1 Enables dc offset cancellation. When the PGA is enabled, only a gain value of 4 is supported.

[14:13]

Reserved

Reserved.

0x0

R/W

[12:8]

MUXSELN

Select signals for the ADC input multiplexer as negative input.

0x0

R/W

00000 Floating input.

00001 High speed TIA negative input

00010 Low power TIA negative input

00011 Reserved.

00100 AIN0.

00101 AIN1.

00110 AIN2.

00111 AIN3/BUF_VREF1V8.

01000 VBIAS_CAP.

01001 Reserved.

01010 Reserved.

01011 Temperature sensor negative output. TEMPSEN_N.

01100 AIN4/LPF0.

01101 Reserved.

01110 AIN6. (AD5940 only)

01111 Reserved.

10000 VZERO0—Measured at VZERO pin.

10001 VBIAS0—Measured at VBIAS pin.

10010 Reserved.

10011 Reserved.

10100 Negative node of excitation amplifier.

10101 Reserved.

10110 Reserved.

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