Datasheet ADS1015

7FF0h
Output Code
-FS 0 +FS
Input Voltage V
IN
7FE0h
0010h
0000h
8000h
FFF0h
8010h
-FS
2 - 1
11
2
11
+FS
2 - 1
11
2
11
. . .
. . .
. . .. . .
22
ADS1013 , ADS1014 , ADS1015
SBAS473E –MAY 2009–REVISED JANUARY 2018 www.ti.com
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8.5.4 Data Format
The ADS101x provide 12 bits of data in binary two's complement format that is left justified within the 16-bit data
word. A positive full-scale (+FS) input produces an output code of 7FF0h 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 3
summarizes the ideal output codes for different input signals. Figure 18 shows code transitions versus input
voltage.
(1) Excludes the effects of noise, INL, offset, and gain errors.
Table 3. Input Signal Versus Ideal Output Code
INPUT SIGNAL
V
IN
= (V
AINP
– V
AINN
) IDEAL OUTPUT CODE
(1)(1)
≥ +FS (2
11
– 1)/2
11
7FF0h
+FS/2
11
0010h
0 0000h
–FS/2
11
FFF0h
≤ –FS 8000h
Figure 18. Code Transition Diagram
NOTE
Single-ended signal measurements, where V
AINN
= 0 V and V
AINP
= 0 V to +FS, only use
the positive code range from 0000h to 7FF0h. However, because of device offset, the
ADS101x can still output negative codes in case V
AINP
is close to 0 V.