ADS9813 datasheet(21/57 Pages) TI1

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The CM voltage rejection circuit is configured depending on the analog input range of the PGA when using

single-ended inputs. Table 6-4 lists the recommended configuration for single-ended inputs for various analog

input voltage ranges.

Table 6-4. Wide Common-Mode Configuration for Single-Ended Inputs

PGA ANALOG

INPUT RANGE

CM_CTRL_EN

ANALOG INPUT CHANNELS 1–4

ANALOG INPUT CHANNELS 5–8

CM_EN_CH[4:1]

CM_RNG_CH[4:1]

CM_EN_CH[8:5]

CM_RNG_CH[8:5]

±2.5V, ±3.5V, and

±5V

Don't care

±7V, ±10V, and ±12V

6.3.2 ADC Transfer Function

The ADS9813 outputs 18 bits of conversion data in either straight-binary or binary two's-complement formats.

The format for the output codes is the same across all analog channels. Select the format for the output

codes with the DATA_FORMAT register bits. Figure 6-3 and Table 6-5 show the transfer characteristics for the

ADS9813. The LSB size depends on the analog input range selected.

ANALOG INPUT

–FS+(0.5)LSB

0V–(0.5)LSB

+FS–(1.5)LSB

0x1FFFF

0x1FFFE

0x00001

0x00000

0x3FFFF

0x20002

0x20001

0x20000

Twos

Complement

0x3FFFF

0x3FFFE

0x20001

0x20000

0x1FFFF

0x00002

0x00001

0x00000

Straight

Binary

Figure 6-3. Transfer Characteristics

Table 6-5. ADC Full-Scale Range and LSB Size

RANGE

+FS

MIDSCALE

–FS

LSB

±2.5V

2.5V

–2.5V

19.07µV

±3.5V

3.5V

–3.5V

26.70µV

±5V

–5V

38.15µV

±7V

–7V

53.41µV

±10V

10V

–10V

76.29µV

±12V

12V

–12V

91.55µV

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ADS9813

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