Datasheet

MAX9708
20W/40W, Filterless, Spread-Spectrum,
Mono/Stereo, Class D Amplifier
2
Maxim Integrated
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(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)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
PV
DD
, V
DD
to PGND, GND .......................................-0.3 to +30V
PV
DD
to V
DD
..........................................................-0.3V to +0.3V
OUTR+, OUTR-, OUTL+,
OUTL- to PGND, GND...........................-0.3V to (PV
DD
+ 0.3V)
C1N to GND .............................................-0.3V to (PV
DD
+ 0.3V)
C1P to GND..............................(PV
DD
- 0.3V) to (CPV
DD
+ 0.3V)
CPV
DD
to GND ..........................................(PV
DD
- 0.3V) to +40V
All Other Pins to GND.............................................-0.3V to +12V
Continuous Input Current (except PV
DD
, V
DD
, OUTR+,
OUTR-, OUTL+, and OUTL-) ...........................................20mA
Continuous Power Dissipation (T
A
= +70°C)
56-Pin TQFN (derate 47.6mW/°C above +70°C) ............3.81W
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range .............................-65°C to +150°C
Junction Temperature......................................................+150°C
Thermal Resistance (θ
JC
)
56-Pin TQFN… .............................................................0.6°C/W
Lead Temperature (soldering, 10s) .................................+300°C
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Supply Voltage Range V
DD
Inferred from PSRR test 10 18 V
Shutdown Current I
SHDN
SHDN = low 0.1 1 µA
Shutdown to Full Operation t
SON
100 ms
Mute to Full Operation t
MUTE
100 ms
G1 = 0, G2 = 1 50 85 125
G1 = 1, G2 = 1 40 63 90
G1 = 1, G2 = 0 25 43 60
Input Impedance R
IN
G1= 0, G2 = 0 12 21 30
kΩ
Output Pulldown Resistance SHDN = GND 600 kΩ
Output Offset Voltage V
OS
AC-coupled input, measured between
OUT_+ and OUT_-
±30 mV
PV
DD
= 10V to 18V 68 90
f
RIPPLE
= 1kHz 90
Power-Supply Rejection Ratio PSRR
200mV
P-P
ripple
(Note 2)
f
RIPPLE
= 20kHz 50
dB
DC, input referred 50 70
Common-Mode Rejection Ratio CMRR
f = 20Hz to 20kHz, input referred 70
dB
Switch On-Resistance R
DS
One power switch 0.3 0.75 Ω
FS1 FS2
0 0 180 200 220
1 1 (SSM) 200
1 0 160
Switching Frequency f
SW
0 1 250
kHz
Oscillator Spread Bandwidth FS1 = FS2 = high (SSM) ±2 %
SYNCIN Lock Range Equal to f
SW
x 4 600 1200 kHz