MAX9879

Stereo Class D Audio Subsystem

with DirectDrive Headphone Amplifier

14

Maxim Integrated

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.)

MAX9879 toc41

2ms/div

SDA

2V/div

SCL

2V/div

HP_

1V/div

THD+N vs. OUTPUT POWER

BYPASS SWITCH

OUTPUT POWER (mW)

800

600

400

200

0.1

1

10

100

0.01

0

1000

fIN = 100Hz

PVDD_ = 3.7V

RL = 8

Ω

NO SERIES RESISTORS

fIN = 1kHz

fIN = 6kHz

THD+N vs. OUTPUT POWER

BYPASS SWITCH

OUTPUT POWER (mW)

10

1

0.1

0.01

060

150

120

30

90

fIN = 100Hz

fIN = 1kHz

fIN = 6kHz

PVDD_ = 3.7V

RL = 8

Ω

NO SERIES RESISTORS

MAX9879 toc42

2ms/div

SDA

2V/div

SCL

2V/div

HP_

1V/div

ANALOG SWITCH