Datasheet

MAX9708
20W/40W, Filterless, Spread-Spectrum,
Mono/Stereo, Class D Amplifier
3
Maxim Integrated
ELECTRICAL CHARACTERISTICS (continued)
(PV
DD
= V
DD
= +18V, PGND = GND = 0V, C
SS
= 0.47µF, C
REG
= 0.01µF, C1 = 0.1µF, C2 = 1µF, R
LOAD
= ∞, MONO = low (stereo
mode), SHDN = MUTE = high, G1 = low, G2 = high (A
V
= 22dB), FS1 = FS2 = high (SSM), SYNCIN = low. All load resistors (R
L
) are
connected between OUT_+ and OUT_-, unless otherwise stated. T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
G1 = 0, G2 = 1 21.6 22.0 22.3
G1 = 1, G2 = 1 24.9 25.0 25.6
G1 = 1, G2 = 0 29.2 29.5 29.9
Gain A
V
G1 = 0, G2 = 0 35.9 36.0 36.6
dB
TH2 TH1 TH0
0 0 0 +80
0 0 1 +90
0 1 0 +100
0 1 1 +110
1 0 0 +120
1 0 1 +129
1 1 0 +139
TEMP Flag Threshold T
FLAG
1 1 1 +150
°C
TEMP Flag Accuracy From +80°C to +140°C ±6 °C
TEMP Flag Hysteresis 2°C
STEREO MODE (R
LOAD
= 8Ω)
MUTE = 1, R
LOAD
= ∞ 20 30
Quiescent Current
MUTE = 0 5 11
mA
Output Power P
OUT
f = 1kHz, THD = 10%, T
A
= +25°C,
R
LOAD
= 8Ω, PV
DD
= 18V
20 21 W
Total Harmonic Distortion Plus
Noise
THD+N
f = 1kHz, BW = 22Hz to 22kHz,
R
LOAD
= 8Ω, P
OUT
= 8W
0.1 %
22Hz to 22kHz 91
Signal-to-Noise Ratio SNR R
LOAD
= 8Ω, P
OUT
= 10W
A-weighted 96
dB
Efficiency η
R
LOAD
= 8Ω, L > 60µH , P
OU T
= 15W + 15W ,
f = 1kHz
87 %
Left-Right Channel Gain
Matching
P
OUT
= 10W 0.02 dB