SLASF77A December 2022 – September 2023 AFE11612-SEP
PRODUCTION DATA
The device has 16 uncommitted analog inputs; 12 of these inputs (CH4 to CH15) are single-ended. The inputs for CH0 to CH3 can be configured as four single-ended inputs or two fully-differential channels, depending on the setup of the ADC channel registers, ADC Channel Register 0 and ADC Channel Register 1. See Section 7.6 for details. Figure 7-1 shows the device equivalent input circuit. The (peak) input current through the analog inputs depends on the sample rate, input voltage, and source impedance. The current into the device charges the internal capacitor array during the sample period. After this capacitance is fully charged, there is no further input current. The source of the analog input voltage must be able to charge the input capacitance to a 12-bit settling level within the acquisition time. When the converter goes into hold mode, the input impedance is greater than 1 GΩ.