SBASAM0B March 2024 – November 2024 ADS127L18
PRODMIX
The input precharge buffers reduce the kick-back voltage caused by the ADC sampling capacitor. Reducing the kick-back improves linearity performance and relaxes the bandwidth requirements of the signal driver. Generally, the buffers provides the greatest benefit for input driver bandwidths of 10MHz or less. For higher bandwidth drivers, disabling the precharge buffers is optional to reduce power consumption. However, full-rated THD and SNR data sheet performance is realized when the buffers are used for most input drivers up to 150MHz. Slower ADC speed modes operate the modulator at slower clock rates, thus the driver has more time to settle between modulator input samples. See the related single-channel ADC THP210 and ADS127L11 Performance application note for details of the THP210 driver performance.