ADS8699IPWR datasheet(32/74 Pages) TI2

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7.3.8 ADC Transfer Function

The device supports a pseudo-differential input supporting both bipolar and unipolar input ranges. The output of

the device is in straight-binary format for both bipolar and unipolar input ranges.

The ideal transfer characteristic for all input ranges is shown in Figure 7-15. The full-scale range (FSR) for each

input signal is equal to the difference between the positive full-scale (PFS) input voltage and the negative full-

scale (NFS) input voltage. The LSB size is equal to FSR / 218 . For a reference voltage of VREF = 4.096 V, the

LSB values corresponding to the different input ranges are listed in Table 7-4.

00001h

3FFFFh

20000h

FSR ± 1 LSB

FSR / 2

1 LSB

Analog Input

(AIN_P ± AIN_GND)

NFS

PFS

Figure 7-15. Device Transfer Function (Straight-Binary Format)

Table 7-4. ADC LSB Values for Different Input Ranges (VREF = 4.096 V)

INPUT RANGE

POSITIVE FULL-SCALE

(V)

NEGATIVE FULL-SCALE

(V)

FULL-SCALE RANGE

(V)

LSB

±3 × VREF

12.288

–12.288

24.576

93.75 µV

±2.5 × VREF

10.24

–10.24

20.48

78.125 µV

±1.5 × VREF

6.144

–6.144

12.288

46.875 µV

±1.25 × VREF

5.12

–5.12

10.24

39.06 µV

±0.625 × VREF

2.56

–2.56

5.12

19.53 µV

0 to 3 × VREF

12.288

46.875 µV

0 to 2.5 × VREF

10.24

39.06 µV

0 to 1.5 × VREF

6.144

23.43 µV

0 to 1.25 × VREF

5.12

19.53 µV

ADS8691, ADS8695, ADS8699

SBAS777B – DECEMBER 2016 – REVISED MARCH 2021

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