ADS1118_13 Datasheet, PDF (17/38 Pages) Texas Instruments – Ultra-Small, Low-Power, SPI™-Compatible, 16-Bit Analog-to-Digital Converter and Temperature Sensor with Internal Reference

ADS1118
www.ti.com
SBAS457C – OCTOBER 2010 – REVISED FEBRUARY 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)
≥ FS (2¹⁵ – 1)/2¹⁵
+FS/2¹⁵
0
–FS/2¹⁵
≤ –FS
IDEAL OUTPUT CODE⁽¹⁾
7FFFh
0001h
0
FFFFh
8000h
(1) Excludes the effects of noise, INL, offset, and gain errors.
0x7FFF
0x7FFE
0x0001
0x0000
0xFFFF
0x8001
0x8000
-FS
¼₀ ¼
FS
Input Voltage (AIN_P - AIN_N)
2¹⁵ - 1
2¹⁵ - 1
-FS
FS
2¹⁵
2¹⁵
Figure 42. ADS1118 Code Transition Diagram
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