MAX9708

20W/40W, Filterless, Spread-Spectrum,

Mono/Stereo, Class D Amplifier

6

Maxim Integrated

TOTAL HARMONIC DISTORTION PLUS NOISE

vs. FREQUENCY

FREQUENCY (Hz)

10k

1k

100

0.1

10

100k

1

0.01

PVDD = 18V,

4

ΩMONO MODE,

POUT = 18W

WIDEBAND OUTPUT SPECTRUM

(SSM MODE)

FREQUENCY (Hz)

10M

1M

-60

-50

-40

-30

-20

-10

0

10

20

30

-70

100k

100M

10kHz RBW

WIDEBAND OUTPUT SPECTRUM

(FFM MODE)

FREQUENCY (Hz)

10M

1M

100k

100M

10kHz RBW

-60

-50

-40

-30

-20

-10

0

10

20

30

-70

OUTPUT FREQUENCY SPECTRUM

(SSM MODE)

FREQUENCY (kHz)

20

16

12

8

4

-100

-80

-60

-40

-20

0

-120

024

OUTPUT FREQUENCY SPECTRUM

(FFM MODE)

FREQUENCY (kHz)

20

16

12

8

4

-100

-80

-60

-40

-20

0

-120

024

Typical Operating Characteristics (continued)

(PVDD = VDD = +18V, PGND = GND = 0V, CSS = 0.47µF, CREG = 0.01µF, C1 = 0.1µF, C2 = 1µF, RLOAD = ∞, SHDN = high, MONO

= low, MUTE = high, G1 = low, G2 = high, FS1 = FS2 = high (SSM), SYNCIN = low. All load resistors (RL) are between OUT_+ and

OUT_-, TA = +25°C, unless otherwise stated.)

TOTAL HARMONIC DISTORTION PLUS NOISE

vs. OUTPUT POWER

OUTPUT POWER (W)

20

15

10

5

0.1

1

10

100

0.01

025

PVDD = 12V,

MONO MODE,

fIN = 1kHz

RL = 4

Ω