MAX9708

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

Mono/Stereo, Class D Amplifier

4

Maxim Integrated

ELECTRICAL CHARACTERISTICS (continued)

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

mode), SHDN = MUTE = high, G1 = low, G2 = high (AV = 22dB), FS1 = FS2 = high (SSM), SYNCIN = low. All load resistors (RL) are

connected between OUT_+ and OUT_-, unless otherwise stated. TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA

= +25°C.) (Note 1)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

Output Short-Circuit Current

Threshold

ISC

RLOAD = 0

Ω

2.4

A

Into shutdown

-63

Click-and-Pop Level

KCP

Peak voltage, 32

samples/second,

A-weighted (Notes 2, 4)

Out of shutdown

-55

dBV

MONO MODE (RLOAD = 4

Ω, MONO = High)

MUTE = 1, RLOAD =

∞

20

Quiescent Current

MUTE = 0

5

mA

RLOAD = 8

Ω

23

Output Power

POUT

f = 1kHz,

THD = 10%

RLOAD = 4

Ω

42

W

Total Harmonic Distortion Plus

Noise

f = 1kHz, BW = 22Hz to 22kHz,

RLOAD = 4

Ω, POUT = 17W

0.12

%

20Hz to 20kHz

91

Signal-to-Noise Ratio

SNR

RLOAD = 4

Ω,

POUT = 10W

A-weighted

95

dB

Efficiency

η

RLOAD = 4

Ω, L > 40µH, POUT = 42W,

f = 1kHz

85

%

Output Short-Circuit Current

Threshold

ISC

RLOAD = 0

Ω

4.8

A

Into shutdown

-60

Click-and-Pop Level

KCP

Peak voltage, 32

samples/second,

A-weighted (Notes 2, 4)

Out of shutdown

-63

dBV

DIGITAL INPUTS (

SHDN, MUTE, G1, G2, FS1, FS2, TH0, TH1, TH2, SYNCIN, MONO)

Logic-Input Current

IIN

0 to 12V

1

µA

Logic-Input High Voltage

VIH

2.5

V

Logic-Input Low Voltage

VIL

0.8

V

OPEN-DRAIN OUTPUTS (

TEMP, SYNCOUT)

Open-Drain Output Low Voltage

VOL

ISINK = 3mA

0.4

V

Leakage Current

ILEAK

VPULLUP = 5.5V

0.2

µA

Note 1: All devices are 100% production tested at +25°C. All temperature limits are guaranteed by design.

Note 2: Inputs AC-coupled to GND.

Note 3: The device is current limited. The maximum output power is obtained with an 8

Ω load.

Note 4: Testing performed with an 8

Ω resistive load in series with a 68µH inductive load connected across BTL outputs. Mode tran-

sitions are controlled by SHDN.