ZHCSEI2B January 2016 – June 2021 TPS7A84
PRODUCTION DATA
The TPS7A84 includes a low-noise reference and error amplifier ensuring minimal noise during operation. The NR/SS capacitor (CNR/SS) and feed-forward capacitor (CFF) are the easiest way to reduce device noise. CNR/SS filters the noise from the reference and CFF filters the noise from the error amplifier. The noise contribution from the charge pump is minimal. The overall noise of the system at low output voltages can be reduced by using a bias rail because this rail provides more headroom for internal circuitry.
The high power-supply rejection ratio (PSRR) of the TPS7A84 ensures minimal coupling of input supply noise to the output. The PSRR performance is primarily results from a high-bandwidth, high-gain error amplifier and an innovative circuit to boost the PSRR between 200 kHz and 1 MHz.
The combination of a low noise-floor and high PSRR ensure that the device provides a clean supply to the application; see the Section 8.1.6 section for more information on optimizing the noise and PSRR performance.