ADM7155ARDZ-02-R7 datasheet(10/24 Pages) AD

10 / 24 page

ADM7155

Data Sheet

Rev. C | Page 10 of 24

HEADROOM (V)

0.8

0.7

0.6

0.5

0.4

0.3

0.2

0.1

–140

–120

–100

–80

–60

–40

–20

10Hz

100Hz

1kHz

10kHz

100kHz

1MHz

10MHz

Figure 23. Power Supply Rejection Ratio (PSRR) vs. Headroom Voltage at

Different Frequencies, VOUT = 3.3 V, 400 mA Load

FREQUENCY (Hz)

10M

100

10k

100k

–140

–120

–100

–80

–60

–40

–20

ILOAD = 100mA

ILOAD = 200mA

ILOAD = 400mA

ILOAD = 600mA

Figure 24. Power Supply Rejection Ratio (PSRR) vs. Frequency at Various

Loads, VOUT = 1.2 V, VIN = 2.4 V

FREQUENCY (Hz)

10M

100

10k

100k

–140

–120

–100

–80

–60

–40

–20

2.0V

1.5V

1.3V

1.2V

1.1V

Figure 25. Power Supply Rejection Ratio (PSRR) vs. Frequency at Various

Headroom Voltages, VOUT = 1.2 V, 400 mA Load

HEADROOM (V)

2.0

1.01.11.21.31.41.5

1.61.71.81.9

–140

–120

–100

–80

–60

–40

–20

10Hz

100Hz

1kHz

10kHz

100kHz

1MHz

10MHz

Figure 26. Power Supply Rejection Ratio (PSRR) vs. Headroom Voltage,

Different Frequencies, VOUT = 1.2 V, 400 mA Load

FREQUENCY (Hz)

10M

100

10k

100k

–140

–120

–100

–80

–60

–40

–20

1µF

10µF

100µF

1000µF

Figure 27. Power Supply Rejection Ratio (PSRR) vs. Frequency, Different CBYP,

VOUT = 3.3 V, 400 mA Load, 500 mV Headroom

LOAD CURRENT (mA)

1000

100

0.2

0.4

0.6

0.8

1.0

1.2

1.4

1.6

1.8

2.0

10Hz TO 100kHz

100Hz TO 100kHz

Figure 28. RMS Output Noise vs. Load Current (ILOAD)

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