MAX9879(2009) 查看數據表（PDF） - Maxim Integrated

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MAX9879
(Rev.:2009)

Stereo Class D Audio Subsystem with DirectDrive Headphone Amplifier

Maxim Integrated 

Stereo Class D Audio Subsystem

with DirectDrive Headphone Amplifier

Typical Operating Characteristics (continued)

(VDD = VPVDDL = VPVDDR = 3.7V, VCCIO = 1.8V, VGND = VPGNDL = VPGNDR = 0. Single-ended inputs, preamp = 0dB, volume con-

trols = 0dB, BYPASS = 0, SHDN = 1. Speaker loads connected between OUT_+ and OUT_-. Headphone loads connected from HPL

or HPR to GND. RSPK = ∞, RHP = ∞. C1 = C2 = CBIAS = 1µF. TA = +25°C, unless otherwise noted.)

SPEAKER AMPLIFIERS (Headphone Disabled)

THD+N vs. FREQUENCY SPEAKER

10

PVDD_= 3.7V

RL = 8Ω

THD+N vs. FREQUENCY SPEAKER

10

PVDD_= 3.0V

RL = 8Ω

THD+N vs. OUTPUT POWER

10

PVDD_ = 3.7V

RL = 8Ω

1

OUTPUT POWER = 200mW

1

OUTPUT POWER = 100mW

1

fIN = 6kHz

0.1

0.1

0.1

0.01

0.01

OUTPUT POWER = 600mW

0.01

0.1

1

10

100

0.01

FREQUENCY (kHz)

THD+N vs. OUTPUT POWER

10

PVDD_ = 3.0V

RL = 8Ω

1

fIN = 6kHz

OUTPUT POWER = 400mW

fIN = 20Hz

fIN = 1kHz

0.01

0.1

1

10

100

0

200 400 600 800 1000

FREQUENCY (kHz)

OUTPUT POWER (mW)

THD+N vs. OUTPUT POWER

10

PVDD_ = 3.7V

RL = 8Ω

LEFT SPEAKER ONLY

1

fIN = 6kHz

0.1

0.01

0

fIN = 20Hz

fIN = 1kHz

100 200 300 400 500 600 700

OUTPUT POWER (mW)

0.1

0.01

0

fIN = 20Hz

fIN = 1kHz

200 400 600 800 1000

OUTPUT POWER (mW)

EFFICIENCY vs. OUTPUT POWER

100

90

80

70

60

50

40

30

20

10

0

0

fIN = 1kHz, RL = 8Ω

100 200 300 400 500 600 700 800 900

OUTPUT POWER (mW)

OUTPUT POWER vs. SUPPLY VOLTAGE

2000

1800

RL = 8Ω

fIN = 1kHz

1600

THD+N = 10%

1400

1200

1000

800

600

THD+N = 1%

400

200

0

2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5

SUPPLY VOTAGE (V)

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