Datasheet

Data Sheet ADP121
Rev. G | Page 9 of 20
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
10 100 1k 10k 100k 1M 10M
FREQUENCY (Hz)
PSRR (dB)
06901-014
V
RIPPLE
= 50mV
V
IN
= 5V
V
OUT
= 1.2V
C
OUT
= 1µF
150mA
100mA
10mA
1mA
100µA
0µA
Figure 17. Power Supply Rejection Ratio vs. Frequency
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
10 100 1k 10k 100k 1M 10M
FREQUENCY (Hz)
PSRR (dB)
06901-015
V
RIPPLE
= 50mV
V
IN
= 5V
V
OUT
= 1.8V
C
OUT
= 1µF
150mA
100mA
10mA
1mA
100µA
0µA
Figure 18. Power Supply Rejection Ratio vs. Frequency
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
10 100 1k 10k 100k 1M 10M
FREQUENCY (Hz)
PSRR (dB)
06901-016
V
RIPPLE
= 50mV
V
IN
= 5V
V
OUT
= 3.3V
C
OUT
= 1µF
150mA
100mA
10mA
1mA
100µA
0µA
Figure 19. Power Supply Rejection Ratio vs. Frequency
0
–20
–40
–60
–80
–100
–120
10 100 1k 10k 100k 1M 10M
FREQUENCY (Hz)
PSRR (dB)
06901-017
3.3V/150mA
3.3V/100µA
1.2V/150mA
1.2V/100µA
1.8V/150mA
1.8V/100µA
Figure 20. Power Supply Rejection Ratio vs. Frequency at Various Output
Voltages and Load Currents
10
1
0.1
0
10 100 1k 10k 100k
FREQUENCY (Hz)
NOISE (µV/√Hz)
06901-021
1.2V
1.8V
3.3V
Figure 21. Output Noise Spectrum, V
IN
= 5 V, I
LOAD
= 10 mA, C
OUT
= 1 µF
70
60
50
40
30
20
10
0
0.001 0.01 0.1 1 10 100 1000
I
LOAD
(mA)
OUT
NOISE
(µV rms)
06901-022
3.3V
2.5V
1.8V
1.5V
1.2V
Figure 22. Output Noise vs. Load Current and Output Voltage, V
IN
= 5 V, C
OUT
= 1 μF