2 x 1.5W, Stereo Class D Audio Subsystem

with DirectDrive Headphone Amplifier

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7

TOTAL HARMONIC DISTORTION PLUS NOISE

vs. FREQUENCY

FREQUENCY (Hz)

10k

1k

100

0.1

0.001

0.01

1

10

100k

VDD = 5V

RL = 4

Ω

POUT = 400mW

POUT = 1000mW

TOTAL HARMONIC DISTORTION PLUS NOISE

vs. FREQUENCY

FREQUENCY (Hz)

10k

1k

100

0.1

0.001

0.01

1

10

100k

VDD = 5V

RL = 8

Ω

POUT = 150mW

POUT = 750mW

TOTAL HARMONIC DISTORTION PLUS NOISE

vs. FREQUENCY

FREQUENCY (Hz)

10k

1k

100

0.1

0.001

0.01

1

10

100k

VDD = 3.3V

RL = 4

Ω

POUT = 400mW

POUT = 150mW

TOTAL HARMONIC DISTORTION PLUS NOISE

vs. FREQUENCY

FREQUENCY (Hz)

10k

1k

100

0.1

0.001

0.01

1

10

100k

VDD = 3.3V

RL = 8

Ω

POUT = 300mW

POUT = 150mW

TOTAL HARMONIC DISTORTION PLUS NOISE

vs. FREQUENCY

FREQUENCY (Hz)

10k

1k

100

0.01

0.1

1

0.001

10

100k

SSM

FFM

VDD = 3.3V

RL = 8

Ω

POUT = 500mW

TOTAL HARMONIC DISTORTION PLUS NOISE

vs. OUTPUT POWER

OUTPUT POWER (W)

1.6

1.2

0.8

0.4

0.01

0.1

1

10

100

0.001

0

2.0

VDD = 5V

RL = 4

Ω

f = 10kHz

f = 20Hz

f = 1kHz

Typical Operating Characteristics

(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.)