Datasheet

MAX9768
10W Mono Class D Speaker
Amplifier with Volume Control
4 _______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS (continued)
(V
PV
DD
= 12V, V
DD
= 3.3V, V
GND
= V
PGND
= 0, V
SHDN
= V
DD
, V
MUTE
= 0; Max volume setting; speaker load resistor connected
between OUT+ and OUT-, R
L
= ∞, unless otherwise noted. C
BIAS
= 2.2µF, C1 = C2 = 0.1µF, C
IN
= 0.47µF, R
IN
= 20kΩ, R
F
= 30kΩ,
SSM mode. Filterless modulation mode (see the
Functional Diagram/Typical Application Circuit ). 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
SYNC = GND 265 300 330
SYNC = unconnected 324 360 396
Class D Switching
Frequency
SYNC = V
DD
(spread-spectrum modulation
mode)
300
±7.5
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
)2%
Into shutdown 52.6
Out of shutdown 48
Into mute 67
Click-and-Pop Level (Note 2) K
CP
Peak voltage, 32 samples
per second, A-weighted, R
IN
x C
IN
≤ 10ms to guarantee
clickless/popless operation
Out of mute 57
dBV
Input Impedance DC volume control mode (SDA/VOL) 100 MΩ
Input Hysteresis DC volume control mode (SDA/VOL) 11 mV
9.5dB Gain Voltage DC volume control mode (SDA/VOL) 0.1 x V
DD
V
Full Mute Voltage DC volume control mode (SDA/VOL) 0.9 x V
DD
V
DIGITAL INPUTS (SHDN, MUTE, ADDR1, ADDR2, SYNC)
SYNC 2.33
Input-Voltage High V
IH
All other pins 0.7 x V
DD
V
SYNC 0.8
Input-Voltage Low V
IL
All other pins 0.3 x V
DD
V
I
SYNC
T
A
= +25°C ±7.5 ±13
Input Leakage Current
I
LK
All other digital inputs, T
A
= +25°C ±1
µA
DIGITAL OUTPUT (SYNCOUT)
Output-Voltage High Load = 1mA V
DD
- 0.3 V
Output-Voltage Low Load = 1mA 0.3 V
Rise/Fall Time C
L
= 10pF 5 ns