Datasheet

ADP7182 Data Sheet
Rev. C | Page 16 of 28
0
–90
–80
–70
–60
–50
–40
–30
–20
–10
0 4.0
3.5
3.0
2.5
2.0
1.5
1.00.5
PSRR (dB)
HEADROOM VOLTAGE (V)
FREQUENCY = 100Hz
FREQUENCY = 1kHz
FREQUENCY = 10kHz
FREQUENCY = 100kHz
FREQUENCY = 1MHz
FREQUENCY = 10MHz
10703-055
Figure 55. Power Supply Rejection Ratio (PSRR) vs. Headroom Voltage,
V
OUT
= −3 V, Load Current (I
LOAD
) = −200 mA
0
–100
–90
–80
–70
–60
–50
–40
–30
–20
–10
10 100 1k 10k 100k 1M 10M
PSRR (dB)
FREQUENCY (Hz)
I
LOAD
= –200mA
I
LOAD
= –100mA
I
LOAD
= –10mA
I
LOAD
= –1mA
10703-056
Figure 56. Power Supply Rejection Ratio (PSRR) vs. Frequency,
Adjustable Output Voltage, V
OUT
= −15 V vs. Different Load Currents (I
LOAD
),
V
IN
= −15.5 V with Noise Reduction Network
0
–100
–90
–80
–70
–60
–50
–40
–30
–20
–10
10 100 1k 10k 100k 1M 10M
PSRR (dB)
FREQUENCY (Hz)
I
LOAD
= –200mA
I
LOAD
= –100mA
I
LOAD
= –10mA
I
LOAD
= –1mA
10703-057
Figure 57. Power Supply Rejection Ratio (PSRR) vs. Frequency,
Adjustable Output Voltage, V
OUT
= −15 V vs. Different Load Currents (I
LOAD
),
V
IN
= −16.5 V with Noise Reduction Network
0
–80
–70
–60
–50
–40
–30
–20
–10
0
2.00
1.75
1.501.251.000.750.500.25
PSRR (dB)
HEADROOM VOLTAGE (V)
FREQUENCY = 100Hz
FREQUENCY = 1kHz
FREQUENCY = 10kHz
FREQUENCY = 100kHz
FREQUENCY = 1MHz
FREQUENCY = 10MHz
10703-058
Figure 58. Power Supply Rejection Ratio (PSRR) vs. Headroom Voltage,
Adjustable Output Voltage, V
OUT
= −15 V with Noise Reduction Network,
Load Current (I
LOAD
) = −200 mA
1000
1
10
100
0.001 0.01 0.1
1 10 100
1000
NOISE (µV rms)
LOAD CURRENT (mA)
V
OUT
= –5V
V
OUT
= –1.8V
V
OUT
= –15V ADJ NR
V
OUT
= –3V
V
OUT
= –1.2V
V
OUT
= –15V ADJ
10703-059
Figure 59. RMS Noise vs. Load Current (I
LOAD
), Various Output Voltages
100k
1
10
100
1k
10k
1 100M
10M1M100k
10k1k10010
NOISE SPECTRAL DENSITY (nV Hz)
FREQUENCY (Hz)
10703-060
V
OUT
= –5V
V
OUT
= –1.8V
V
OUT
= –15V ADJ NR
V
OUT
= –3V
V
OUT
= –1.2V
V
OUT
= –15V ADJ
Figure 60. Noise Spectral Density, Various Output Voltages