Datasheet
Table Of Contents

TPS7A49xx
SBVS121B –AUGUST 2010–REVISED JANUARY 2010
www.ti.com
OUTPUT NOISE Additionally, ac performance can be maximized by
adding a 0.01mF bypass capacitor (C
BYP
) from the FB
The TPS7A49xx provides low output noise when a
pin to the OUT pin. This capacitor greatly improves
noise reduction capacitor (C
NR/SS
) is used.
power-supply rejection at lower frequencies, for the
band from 10Hz to 200kHz; see Figure 18.
The noise reduction capacitor serves as a filter for the
internal reference. By using a 0.01mF noise reduction
The very high power-supply rejection of the
capacitor, the output noise is reduced by almost 75%
TPS7A49xx makes it a good choice for powering
(from 69mV
RMS
to 17mV
RMS
); see Figure 20.
high-performance analog circuitry, such as
operational amplifiers, ADCs, DACS, and audio
TPS7A49xx low output voltage noise makes it an
amplifiers.
ideal solution for powering noise-sensitive circuitry.
TRANSIENT RESPONSE
POWER-SUPPLY REJECTION
As with any regulator, increasing the size of the
The 0.01mF noise reduction capacitor greatly
output capacitor reduces over/undershoot magnitude
improves TPS7A49xx power-supply rejection,
but increases duration of the transient response.
achieving up to 15dB of additional power-supply
rejection for frequencies between 110Hz and
200KHz.
12 Submit Documentation Feedback Copyright © 2010, Texas Instruments Incorporated