2 x 1.5W, Stereo Class D Audio Subsystem

with DirectDrive Headphone Amplifier

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13

Typical Operating Characteristics (continued)

(VDD = PVDD = CPVDD = 3.3V, GND = PGND = CPGND = 0V, SHDN = VDD, I2C default gain settings (INA gain = +20dB, INB gain =

INC gain = 0dB, volume setting = 0dB, mono path gain = 0dB, SHDN = 1, SSM = 1). Speaker load resistors (RLSP) are terminated

between OUT_+ and OUT_-, headphone load resistors are terminated to GND, unless otherwise stated. C1 = C2 = C3 = 1µF. TA =

+25°C, unless otherwise noted.)

OUTPUT POWER

vs. LOAD

LOAD (

Ω)

100

20

40

60

80

100

120

140

160

180

200

0

10

1000

THD+N = 10%

THD+N = 1%

VDD = 5V

f = 1kHz

OUTPUT POWER

vs. LOAD

LOAD (

Ω)

100

20

40

60

80

100

120

140

160

180

200

0

10

1000

THD+N = 10%

THD+N = 1%

VDD = 3.3V

f = 1kHz

OUTPUT POWER vs. LOAD RESISTANCE

AND CHARGE-PUMP CAPACITOR SIZE

LOAD (

Ω)

0

20

40

60

80

100

10

100

1000

C1 = C2 = 2.2

μF

VDD = 3.3V

f = 1kHz

THD+N = 1%

C1 = C2 = 1

μF

C1 = C2 = 0.68

μF

POWER-SUPPLY REJECTION RATIO

vs. FREQUENCY

FREQUENCY (Hz)

-100

-90

-80

-70

-60

-50

-40

-30

-20

-10

0

10

100

1k

10k

100k

HPL

HPR

VDD = 3.3V

VIN = 100mVP-P

RL = 32

Ω

OUTPUT FREQUENCY SPECTRUM

FREQUENCY (Hz)

15k

10k

5k

-120

-100

-80

-60

-40

-20

0

20

-140

0

20k

VDD = 3.3V

f = 1kHz

RL = 32

Ω

CROSSTALK vs. FREQUENCY

FREQUENCY (Hz)

-120

-110

-100

-90

-80

-70

-60

-50

-40

-30

-20

-10

0

10

100

1k

10k

100k

OUT_ = 1VP-P

RL = 32

Ω

LEFT TO RIGHT

RIGHT TO LEFT