Datasheet

MAX9744
20W Stereo Class D Speaker Amplifier
with Volume Control
4 _______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS (continued)
(V
PVDD
= 12V, V
DD
= 3.3V, V
GND
= V
PGND
= 0V, V
MUTE
= 0V; max volume setting; all speaker load resistors connected between
OUT_+ and OUT_-, R
L
= ∞, unless otherwise stated, C
BOOT_
= 0.1µF, C
BIAS
= 2.2µF, C
IN
= 0.47µF, R
IN
= 20kΩ, R
F_
= 20kΩ, spread-
spectrum mode, filterless modulation mode, see the
Functional Diagrams/Typical Application Circuits. T
A
= T
MIN
to T
MAX
, unless oth-
erwise noted. Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
1kHz 85
Crosstalk
20Hz to 20kHz 68
dB
V
DD
= 2.7V to 3.6V, T
A
= 25°C,
MUTE = high
68
PV
DD
= 4.5V to 14V 50 83
f = 1kHz, V
RIPPLE
= 100mV
P-P
on V
DD
70
Power-Supply Rejection Ratio PSRR
f = 1kHz, V
RIPPLE
= 200mV
P-P
on PVDD 75
dB
SYNC = GND 1020 1200 1355
SYNC = unconnected 1280 1440 1640
SYNC Frequency f
SYNC
SYNC = V
DD
(spread-spectrum mode)
1200
±30
kHz
SYNC = GND 255 300 338
SYNC = unconnected 320 360 410
Class D Switching Frequency f
SW
SYNC = V
DD
(spread-spectrum mode)
300
±6
kHz
SYNC Frequency Lock Range 1000 1600 kHz
Minimum SYNC Frequency Lock
Duty Cycle
40 %
Maximum SYNC Frequency Lock
Duty Cycle
60 %
Gain Matching Full volume (ideal matching for R
IN
and R
F
) 0.2 dB
Into shutdown -43
Out of shutdown -43
Into mute -46
Click-and-Pop Level K
CP
Peak voltage, 32
samples/second,
A-weighted (Note 4)
Out of mute -57
dBV
VOLUME CONTROL
VOL Input Leakage Current ±5 µA
Input Hysteresis DC volume control mode 11 mV
9.5dB Gain Voltage DC volume control mode 0.1 x V
DD
V
Full Mute Voltage DC volume control mode 0.9 x V
DD
V
Full Mute Attenuation f = 1kHz, relative to 9.5dB setting -115 dB
DIGITAL INPUTS/OUTPUT (SHDN, MUTE, ADDR1, ADDR2, SCLK, SDA/VOL)
Input-Voltage High V
IH
0.7 x V
DD
V
Input-Voltage Low V
IL
0.3 x V
DD
V
Input Leakage Current I
LK
T
A
= +25°C ±1 µA
Input Hysteresis SCLK, SDA/VOL 0.1 x V
DD
V
Input Capacitance C
IN
5pF
Output-Voltage Low V
IL
I
OL
= 3mA 0.4 V