MAX9879

Stereo Class D Audio Subsystem

with DirectDrive Headphone Amplifier

12

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.)

HEADPHONE AMPLIFIERS (Speaker Disabled)

TOTAL HARMONIC DISTORTION + NOISE

vs. OUTPUT POWER (HEADPHONE MODE)

OUTPUT POWER (mW)

10

0.1

10

0.01

100

0.001

0.1

1

100

VDD = 3.7V

RL = 32

Ω

RL = 16

Ω

POWER DISSIPATION vs. OUTPUT POWER

(HEADPHONE MODE)

TOTAL OUTPUT POWER (mW)

10

200

225

175

250

100

125

75

50

25

150

0

0

1

100

VDD = 3.0V

RL = 16

Ω

RL = 32

Ω

OUTPUT POWER vs. SUPPLY VOLTAGE

SUPPLY VOLTAGE (V)

3.5

3.9

4.3

4.7

5.1

60

75

50

80

20

30

10

40

0

2.7

3.1

5.5

THD+N = 10%

THD+N = 10%

RL = 32

Ω

fIN = 1kHz

OUTPUT POWER vs. SUPPLY VOLTAGE

SUPPLY VOTAGE (V)

3.1

140

120

160

80

60

40

20

100

0

2.7

3.5

4.3

3.9

5.1

4.7

5.5

THD+N = 10%

THD+N = 1%

RL = 16

Ω

fIN = 1kHz

OUTPUT POWER vs. LOAD RESISTANCE

(HEADPHONE MODE)

LOAD RESISTANCE (

Ω)

90

80

100

60

50

40

30

20

10

70

0

10

100

THD+N = 10%

THD+N = 1%

VDD = 3.3V

f = 1kHz

OUTPUT POWER vs. LOAD RESISTANCE

(HEADPHONE MODE)

LOAD RESISTANCE (

Ω)

90

80

100

50

30

20

10

70

0

10

100

C1 = C2 = 0.47

μF

f = 1kHz

THD+N = 1%

C1 = C2 = 1

μF

C1 = C2 = 2.2

μF

POWER SUPPLY REJECTION RATIO

vs. FREQUENCY (HEADPHONE MODE)

FREQUENCY (kHz)

-10

-20

0

-40

-50

-60

-70

-80

-90

-30

-100

0.01

0.1

1

10

100

RIGHT

LEFT

VRIPPLE = 100mVP-P

INPUTS AC GROUNDED

POWER-SUPPLY REJECTION RATIO

vs. FREQUENCY (HEADPHONE MODE)

FREQUENCY (kHz)

-20

-40

0

-80

-100

-120

-60

-140

015

20

510

VOUT = -60dB

f =1kHz

RL = 32

Ω

CROSSTALK vs. FREQUENCY

(HEADPHONE MODE)

FREQUENCY (Hz)

-10

-20

0

-40

-50

-60

-70

-30

-80

0.01

10

100

0.1

1

RL = 16

Ω

f = 1kHz

VIN = 1VP-P

LEFT TO RIGHT

RIGHT TO LEFT