SPRUJ79 November 2024 F29H850TU , F29H859TU-Q1
Figure 24-43 shows the basic organization of the external voltage reference generation circuitry. TI recommends that a single reference voltage generation source is shared by all ADC modules. This minimizes reference voltage mismatch between ADC modules. For best performance, the externally generated reference voltage must be buffered by a precision op-amp with good bandwidth and low output impedance before being driven into the ADC reference pin. A capacitor between the high and low reference pins must be placed on the PCB as close to the pins as practical to help absorb high-frequency currents. A series resistor (typically <1Ω) in series with this capacitor is sometimes necessary to maintain op-amp stability.