MAX9879

Stereo Class D Audio Subsystem

with DirectDrive Headphone Amplifier

13

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.)

COMMON-MODE REJECTION RATIO

vs. FREQUENCY (HEADPHONE MODE)

FREQUENCY (kHz)

10

1

0.1

-70

-60

-50

-40

-30

-20

-10

0

-80

0.01

100

AV = +5.5dB

AV = +20dB

AV = 0dB

MAX9879 toc40

20

μs/div

SHDN

1V/div

HP_

1V/div

HEADPHONE AMPLIFIERS (Speaker Disabled)