MAX9879

Stereo Class D Audio Subsystem

with DirectDrive Headphone Amplifier

4

Maxim Integrated

ELECTRICAL CHARACTERISTICS (continued)

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

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 = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.)

(Notes 3, 4)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

Current Limit

1.5

A

Efficiency

η

POUT = 600mW, f = 1kHz

88

%

Speaker Gain

AV

17.4

18

18.4

dB

Output Noise

A-weighted, (ENA = 1 and ENB = 0

or ENA = 0 and ENB = 1),

ΔIN_ = 0

63

µVRMS

Crosstalk

OUTL to OUTR, OUTR to OUTL,

f = 20Hz to 20kHz

75

dB

HEADPHONE AMPLIFIERS

TA = +25°C (volume at mute)

±0.22

±0.85

mV

Output Offset Voltage

VOS

TA = +25°C (Volume at 0dB, ENA = 1 and

ENB = 0 or ENA = 0 and ENB = 1,

ΔIN_ = 0)

±1.5

mV

Into shutdown

-75

Click-and-Pop Level

KCP

Peak voltage, TA = 25°C

A-weighted, 32 samples

per second, volume at

mute (Note 5)

Out of shutdown

-75

dBV

PVDD_ = VDD

= 2.7V to 5.5V

70

85

f = 217Hz,

VRIPPLE

= 100mVP-P

84

f = 1kHz,

VRIPPLE

= 100mVP-P

80

Power-Supply Rejection Ratio

(Note 5)

PSRR

TA = +25°C

f = 20kHz,

VRIPPLE

= 100mVP-P

62

dB

RHP = 16

Ω

58

Output Power

POUT

THD+N = 1%

RHP = 32

Ω

54

mW

Headphone Gain

AV

2.6

3

3.4

dB

Channel-to-Channel Gain

Tracking

TA = +25°C, HPL to HPR, volume at 0dB,

ENA=1 and ENB = 0 or ENA = 1 and ENB

= 0,

ΔIN_ = 0

±0.3

±2.5

%

RHP = 32

Ω

(POUT = 10mW, f = 1kHz)

0.018

Total Harmonic Distortion + Noise

THD+N

RHP = 16

Ω

(POUT = 10mW, f = 1kHz)

0.037

0.08

%