The devices provide 16 bits of data in binary twos complement format. The size of one code (LSB) is calculated using Equation 11.
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 23 summarizes the ideal output codes for different input signals.
|INPUT SIGNAL, |
VIN = VAINP – VAINN
|IDEAL OUTPUT CODE(1)|
|≥ FS (215 – 1) / 215||7FFFh|
|FS / 215||0001h|
|–FS / 215||FFFFh|
Mapping of the analog input signal to the output codes is shown in Figure 87.