Operating Temperature Range ........................... -40°C to +85°C
Storage Temperature Range ............................ -65°C to +150°C
Lead Temperature (soldering, 10s) ................................. +300°C
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.
Electrical Characteristics
(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
GENERAL
Speaker Supply Voltage
Range
Supply Voltage Range
Quiescent Current
Shutdown Current
Output Offset
Turn-On Time
Common-Mode Bias Voltage
Input Amplifier Output-
Voltage Swing High
Input Amplifier Output-
Voltage Swing Low
Input Amplifier Output
Short-Circuit Current Limit
Input Amplifier Gain-
Bandwidth Product
SPEAKER AMPLIFIERS
Internal Gain
A
VMAX
Max volume setting; from FB to amplifier outputs
|(OUT+) - (OUT-)|; excludes external gain resistors
29.27
30.1
31.00
dB
GBW
PV
DD
V
DD
I
VDD
I
PVDD
I
SHDN
V
OS
t
ON
V
BIAS
V
OH
V
OL
Specified as
V
DD
- V
OH
Specified as
V
OL
- GND
R
L
= 2kΩ connect to 1.5V
R
L
= 2kΩ connect to 1.5V
Filterless modulation
Classic PWM modulation
I
SHDN
= I
PVDD
+ I
DD
,
SHDN
= GND, T
A
= +25°C
Filterless modulation, V
MUTE
= V
DD
, T
A
= +25°C
Filterless modulation, V
MUTE
= 0V, T
A
= +25°C
MAX9768
MAX9768B
Inferred from PSRR test
Inferred from PSRR and UVLO test
4.5
2.7
7
4
4
0.5
±2
±2
220
15
1.5
3.6
6
±60
1.8
100
50
14.0
3.6
14.2
7.6
7.6
50
±12.5
±14
µA
mV
ms
V
mV
mV
mA
MHz
mA
V
V
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
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Maxim Integrated
│
2
MAX9768
10W Mono Class D Speaker
Amplifier with Volume Control
Electrical Characteristics (continued)
((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
Efficiency (Note 2)
SYMBOL
η
P
OUT
= 8W, f
IN
=
1kHz, R
L
= 8Ω
CONDITIONS
Filterless modulation
Classic PWM modulation
R
L
= 8Ω, THD+N = 1%,
filterless modulation
R
L
= 8Ω, THD+N = 10%,
filterless modulation
R
L
= 8Ω, THD+N = 10%,
classic PWM modulation
R
L
= 8Ω, THD+N = 10%,
filterless modulation
R
L
= 8Ω, THD+N = 10%,
classic PWM modulation
R
L
= 8Ω, THD+N = 10%,
filterless modulation
1.75
f = 1kHz, R
L
= 8Ω,
P
OUT
= 5W
0dB = 8W, R
L
=
8Ω, BW = 22Hz to
22kHz, filterless
modulation mode
SNR
0dB = 8W, R
L
=
8Ω, BW = 22Hz
to 22kHz, classic
PWM modulation
0dB = 8W, f = 1kHz
V
DD
= 2.7V to 3.6V, filterless modulation,
T
A
= +25°C
Power-Supply Rejection
Ratio
PSRR
PV
DD
= 4.5V to 14V, filterless modulation,
T
A
= +25°C
f = 1kHz, V
RIPPLE
= 200mV
P-P
on PV
DD
f = 1kHz, V
RIPPLE
= 100mV
P-P
on V
DD
SYNC = GND
Oscillator Frequency
f
OCS
SYNC = unconnected
SYNC = V
DD
(spread-spectrum modulation
mode)
1060
1296
52
67
Unweighted
A-weighted
Filterless modulation
Classic PWM modulation
Unweighted
A-weighted
FFM
SSM
FFM
SSM
FFM
SSM
FFM
SSM
MIN
TYP
87
85
1.3
1.7
9
W
9
10
10
2
2.5
0.09
0.08
94
93
97
97
93
89
97
91
115
68
84
77
60
1200
1440
1200
±30
1320
1584
kHz
dB
dB
dB
A
A
%
MAX
UNITS
%
PV
DD
= 5V
Output Power (Note 2)
P
OUT
PV
DD
= 12V
PV
DD
= 14V
Soft Output Current Limit
Hard Output Current Limit
Total Harmonic Distortion
Plus Noise (Note 2)
I
LIM
I
SC
THD+N
Signal-to-Noise Ratio
(Note 2)
MUTE Attenuation (Note 3)
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Maxim Integrated
│
3
MAX9768
10W Mono Class D Speaker
Amplifier with Volume Control
Electrical Characteristics (continued)
((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
Class D Switching Frequency
SYNC Frequency Lock
Range
Minimum SYNC Frequency
Lock Duty Cycle
Maximum SYNC Frequency
Lock Duty Cycle
Gain Matching
Full volume (ideal matching for R
IN
and R
F
)
Peak voltage, 32 samples
per second, A-weighted, R
IN
x C
IN
≤ 10ms to guarantee
clickless/popless operation
Into shutdown
Out of shutdown
Into mute
Out of mute
SYMBOL
SYNC = GND
SYNC = unconnected
SYNC = V
DD
(spread-spectrum modulation
mode)
CONDITIONS
MIN
265
324
TYP
300
360
300
±7.5
MAX
330
396
kHz
UNITS
1000
40
60
2
52.6
48
67
57
100
11
0.1 x V
DD
0.9 x V
DD
2.33
0.7 x V
DD
1600
kHz
%
%
%
Click-and-Pop Level (Note 2)
K
CP
dBV
Input Impedance
Input Hysteresis
9.5dB Gain Voltage
Full Mute Voltage
DC volume control mode (SDA/VOL)
DC volume control mode (SDA/VOL)
DC volume control mode (SDA/VOL)
DC volume control mode (SDA/VOL)
SYNC
All other pins
SYNC
All other pins
T
A
= +25°C
All other digital inputs, T
A
= +25°C
Load = 1mA
Load = 1mA
C
L
= 10pF
V
DD
- 0.3
MΩ
mV
V
V
DIGITAL INPUTS (SHDN,
MUTE, ADDR1, ADDR2, SYNC)
Input-Voltage High
Input-Voltage Low
Input Leakage Current
DIGITAL OUTPUT (SYNCOUT)
Output-Voltage High
Output-Voltage Low
Rise/Fall Time
V
0.3
5
V
ns
V
IH
V
IL
I
SYNC
I
LK
V
0.8
0.3 x V
DD
±7.5
±13
±1
V
µA
www.maximintegrated.com
Maxim Integrated
│
4
MAX9768
10W Mono Class D Speaker
Amplifier with Volume Control
Electrical Characteristics (continued)
((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
