AD1990

Rev. 0 | Page 9 of 16

20

–140

FREQUENCY (Hz)

0

–20

–40

–60

–80

–100

–120

100

1k

10k

Figure 10. IMD for 19 kHz/20 kHz Twin-Tone Stimulus with

500 mW Power in Each Tone

40

0

FREQUENCY (Hz)

100

1k

10k

35

30

25

20

15

10

5

PGA GAIN = 18dB

PGA GAIN = 12dB

PGA GAIN = 6dB

PGA GAIN = 0dB

Figure 11. Amplifier Gain vs. Frequency, 6 Ω Load, PVDD = 12 V

0

–120

FREQUENCY (Hz)

100

1k

10k

–20

–40

–60

–80

–100

L CHANNEL DRIVEN,

R CHANNEL IDLE

L CHANNEL IDLE,

R CHANNEL DRIVEN

Figure 12. Channel Separation vs. Frequency, Driven Channel Has

1 W Output Power into 6 Ω Load

1

0.0001

FREQUENCY (Hz)

100

1k

10k

0.1

0.01

0.001

–120

–60

–40

–50

–80

–90

–70

–100

–110

Figure 13. THD vs. Frequency, 1 W Output Power into 4 Ω Load, PVDD = 12 V

1

0.0001

FREQUENCY (Hz)

100

1k

10k

0.1

0.01

0.001

–120

–60

–40

–50

–80

–90

–70

–100

–110

Figure 14. THD vs. Frequency, 1 W Output Power into 6 Ω Load, PVDD = 12 V

1

0.0001

FREQUENCY (Hz)

100

1k

10k

0.1

0.01

0.001

–120

–60

–40

–50

–80

–90

–70

–100

–110

Figure 15. THD vs. Frequency, 1 W Output Power into 8 Ω Load, PVDD = 12 V