Datasheet

0x7FFF
OutputCode
-FS
¼
0
¼
FS
InputVoltage(AIN AIN )-
P N
0x7FFE
0x0001
¼
0x0000
0x8000
0xFFFF
0x8001
¼
-FS
2 - 1
15
2
15
FS
2 - 1
15
2
15
ADS1118
www.ti.com SBAS457D –OCTOBER 2010–REVISED OCTOBER 2013
DATA FORMAT
The ADS1118 provides 16 bits of data in binary twos complement format. The positive full-scale input produces
an output code of 7FFFh and the negative full-scale 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 42 shows code transitions versus input voltage.
Table 3. Input Signal versus Ideal Output Code
INPUT SIGNAL, V
IN
(AIN
P
– AIN
N
) IDEAL OUTPUT CODE
(1)
≥ FS (2
15
– 1)/2
15
7FFFh
+FS/2
15
0001h
0 0
–FS/2
15
FFFFh
≤ –FS 8000h
(1) Excludes the effects of noise, INL, offset, and gain errors.
Figure 42. ADS1118 Code Transition Diagram
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