SBAS683B August 2014 – May 2020 ADS1120-Q1
PRODUCTION DATA.
The device provides 16 bits of data in binary twos complement format. The size of one code (LSB) is calculated using Equation 16.
A positive full-scale input [VIN ≥ (+FS – 1 LSB) = (VREF / Gain – 1 LSB)] produces an output code of 7FFFh and a negative full-scale input (VIN ≤ –FS = –VREF / Gain) produces an output code of 8000h. The output clips at these codes for signals that exceed full-scale.
Table 9 summarizes the ideal output codes for different input signals.
INPUT SIGNAL
VIN = (V(AINP) – V(AINN)) |
IDEAL OUTPUT CODE(1) |
---|---|
≥ +FS (215 – 1) / 215 | 7FFFh |
+FS / 215 | 0001h |
0 | 0000h |
–FS / 215 | FFFFh |
≤ –FS | 8000h |
Mapping of the analog input signal to the output codes is shown in Figure 60.