ADS1015 datasheet(21/46 Pages) TI2

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8.5.3 Data Format

The ADS111xL provides 16 bits of data in binary two's-complement format. A positive full-scale (+FS) input

produces an output code of 7FFFh and a negative full-scale (–FS) input produces an output code of 8000h. The

output clips at these codes for signals that exceed full-scale. Table 8-3 summarizes the ideal output codes for

different input signals. Figure 8-12 shows code transitions versus input voltage.

Table 8-3. Input Signal Versus Ideal Output Code

INPUT SIGNAL

VIN = (VAINP – VAINN)

IDEAL OUTPUT CODE(1)

≥ +FS (215 – 1) / 215

7FFFh

+FS / 215

0001h

0000h

–FS / 215

FFFFh

≤ –FS

8000h

(1)

Excludes the effects of noise, INL, offset, and gain errors.

7FFFh

-FS

+FS

Input Voltage V

7FFEh

0001h

0000h

8000h

FFFFh

8001h

-FS

- 1

+FS

- 1

. . .

Figure 8-12. Code Transition Diagram

Note

Single-ended signal measurements, where VAINN = 0 V and VAINP = 0 V to +FS, only use the positive

code range from 0000h to 7FFFh. However, because of device offset, the ADS111xL can still output

negative codes if VAINP is close to 0 V.

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SBASAV5 – DECEMBER 2023

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