19-2744; Rev 0; 1/03
Stereo 3W Audio Power Amplifiers with
Headphone Drive and Input Mux
General Description
The MAX9760–MAX9763 family combines a stereo or
mono 3W bridge-tied load (BTL) audio power amplifier,
stereo single-ended headphone amplifier, headphone
sensing, and a 2:1 input multiplexer all in a tiny 28-pin
thin QFN package. These devices operate from a sin-
gle 4.5V to 5.5V supply and feature an industry-leading
100dB PSRR, allowing these devices to operate from
noisy supplies without the addition of a linear regulator.
An ultra-low 0.002% THD+N ensures clean, low-distor-
tion amplification of the audio signal. Click-and-pop
suppression eliminates audible transients on power and
shutdown cycles. Power-saving features include low
4mV V
OS
(minimizes DC current drain through the
speakers), low 13mA supply current, and a 10µA shut-
down mode. A MUTE function allows the outputs to be
quickly enabled or disabled.
A headphone sense input detects the presence of a
headphone jack and automatically configures the
amplifiers for either speaker or headphone mode. In
speaker mode, the amplifiers can deliver up to 3W of
continuous average power into a 3Ω load. In head-
phone mode, the amplifier can deliver up to 200mW of
continuous average power into a 16Ω load. The gain of
the amplifiers is externally set, allowing maximum flexi-
bility in optimizing output levels for a given load. The
amplifiers also feature a 2:1 input multiplexer, allowing
multiple audio sources to be selected. The multiplexer
can also be used to compensate for limitations in the
frequency response of the loud speakers by selecting
an external equalizer network. The various functions are
controlled by either an I
2
C-compatible or simple parallel
control interface.
The MAX9760–MAX9763 are available in either a ther-
mally efficient 28-pin thin QFN package (5mm
✕
5mm
✕
0.8mm) or a TSSOP-EP package. All devices have ther-
mal overload protection (OVP) and are specified over
the extended -40°C to +85°C temperature range.
♦
PC99/01 Compliant
♦
3W BTL Stereo Speaker Amplifier
♦
200mW Stereo Headphone Amplifier
♦
Low 0.002% THD+N
♦
Click-and-Pop Suppression
♦
ESD-Protected Outputs
♦
Low Quiescent Current: 13mA
♦
Low-Power Shutdown Mode: 10µA
♦
MUTE Function
♦
Headphone Sense Input
♦
Stereo 2:1 Input Multiplexer
♦
Optional 2-Wire, I
2
C-Compatible or Parallel
Interface
♦
Tiny 28-Pin Thin QFN (5mm
✕
5mm
✕
0.8mm) and
TSSOP-EP Packages
Features
♦
Industry-Leading, Ultra-High 100dB PSRR
MAX9760–MAX9763
Ordering Information
PART
MAX9760ETI
MAX9760EUI
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
28 Thin QFN-EP*
28 TSSOP-EP*
*EP = Exposed paddle.
Ordering Information continued at end of data sheet.
Simplified Block Diagram
SINGLE SUPPLY
4.5V TO 5.5V
Applications
Notebooks
Portable DVD Players
Tablet PCs
PC Audio Peripherals
Camcorders
LEFT IN
1
LEFT IN
2
SE/
BTL
RIGHT IN
1
RIGHT IN
2
CONTROL
I
2
C-
COMPATIBLE
Pin Configurations and Functional Diagrams appear at end
of data sheet.
MAX9760
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
Stereo 3W Audio Power Amplifiers with
Headphone Drive and Input Mux
MAX9760–MAX9763
ABSOLUTE MAXIMUM RATINGS
V
DD
to GND ...........................................................................+6V
SV
DD
to GND .........................................................................+6V
SV
DD
to V
DD
.........................................................................-0.3V
PV
DD
to V
DD
.......................................................................±0.3V
PGND to GND.....................................................................±0.3V
All Other Pins to GND.................................-0.3V to (V
DD
+ 0.3V)
Continuous Input Current (into any pin except power-supply
and output pins) ...............................................................±20mA
Continuous Power Dissipation
28-Pin Thin QFN (derate 20.8mW/°C above +70°C) ....1667mW
28-Pin TSSOP-EP (derate 23.8mW/°C above +70°C) ..1905mW
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range .............................-65°C to +150°C
Junction Temperature ......................................................+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
(V
DD
= PV
DD
= 5.0V, GND = PGND = 0V,
SHDN
= 5V, C
BIAS
= 1µF, R
IN
= R
F
= 15kΩ, R
L
=
∞.
T
A
= T
MIN
to T
MAX
, unless otherwise
noted. Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER
Supply Voltage Range
Quiescent Supply Current
(I
VDD
+ I
PVDD
)
Shutdown Current
Switching Time
Turn-On Time
Thermal Shutdown Threshold
Thermal Shutdown Hysteresis
OUTPUT AMPLIFIERS (SPEAKER MODE, HPS = GND)
Output Offset Voltage
V
OS
OUT_+ - OUT_-, A
V
= 1V/V
V
DD
= 4.5V to 5.5V
Power-Supply Rejection Ratio
PSRR
(Note 2)
f = 1kHz, V
RIPPLE
=
200mV
P-P
f = 20kHz, V
RIPPLE
=
200mV
P-P
Output Power
Total Harmonic Distortion Plus
Noise
Signal-to-Noise Ratio
Slew Rate
Maximum Capacitive Load Drive
Crosstalk
P
OUT
f
IN
= 1kHz,
THD+N < 1%,
T
A
= +25°C
f
IN
= 1kHz, BW =
22Hz to 22kHz
R
L
= 8Ω
R
L
= 4Ω
R
L
= 3Ω
P
OUT
= 1W, R
L
= 8Ω
P
OUT
= 2W, R
L
= 4Ω
1
75
±4
100
82
70
1.4
2.6
3
0.005
0.01
95
1.6
No sustained oscillations
f
IN
= 10kHz
1
73
%
dB
V/µs
nF
dB
W
dB
±32
mV
SYMBOL
V
DD
/PV
DD
I
DD
I
SHDN
t
SW
t
ON
BTL mode,
HPS = 0V
SHDN
= GND
Gain or input switching
C
BIAS
= 1µF
C
BIAS
= 0.1µF
CONDITIONS
Inferred from PSRR test
MAX9760/MAX9761
MAX9762/MAX9763
MIN
4.5
13
7
7
10
10
300
30
160
15
TYP
MAX
5.5
32
18
18
50
µA
µs
ms
o
o
UNITS
V
mA
Single-ended mode, HPS = V
DD
C
C
THD+N
SNR
SR
C
L
R
L
= 8Ω, P
OUT
= 1W, BW = 22Hz to 22kHz
2
_______________________________________________________________________________________
Stereo 3W Audio Power Amplifiers with
Headphone Drive and Input Mux
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= PV
DD
= 5.0V, GND = PGND = 0V,
SHDN
= 5V, C
BIAS
= 1µF, R
IN
= R
F
= 15kΩ, R
L
=
∞.
T
A
= T
MIN
to T
MAX
, unless otherwise
noted. Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
V
DD
= 4.5V to 5.5V
Power-Supply Rejection Ratio
PSRR
(Note 2)
f = 1kHz, V
RIPPLE
=
200mV
P-P
f = 20kHz, V
RIPPLE
=
200mV
P-P
Output Power
P
OUT
f
IN
= 1kHz, THD+N < R
L
= 32Ω
1%, T
A
= +25°C
R
L
= 16Ω
f
IN
= 1kHz, BW =
22Hz to 22kHz
P
OUT
= 60mW,
R
L
= 32Ω
P
OUT
= 125mW,
R
L
= 16Ω
120
MIN
75
TYP
106
88
76
88
200
0.002
%
0.002
92
1.8
No sustained oscillations
f
IN
= 10kHz
V
BIAS
= 1.25V, V
DD
= 0V
V
BIAS
= 2.5V, V
DD
= 5V
2.35
2.5
50
2
0.8
±1
0.9 x
V
DD
0.7 x
V
DD
±1
2
78
425
750
15
2.65
dB
V/µs
nF
dB
mW
dB
MAX
UNITS
MAX9760–MAX9763
OUTPUT AMPLIFIERS (HEADPHONE MODE, HPS = V
DD
)
Total Harmonic Distortion Plus
Noise
THD+N
Signal-to-Noise Ratio
Slew Rate
Maximum Capacitive Load Drive
Crosstalk
STANDBY SUPPLY (SV
DD
)
(Note 3)
SV
DD
Current
BIAS VOLTAGE (BIAS)
BIAS Voltage
Output Resistance
Input Voltage High
Input Voltage Low
Input Leakage Current
HEADPHONE SENSE INPUT (HPS)
Input Voltage High
Input Voltage Low
Input Leakage Current
SNR
SR
C
L
R
L
= 32Ω, BW = 22Hz to 22kHz,
V
OUT
= 1V
RMS
I
SVDD
µA
V
BIAS
R
BIAS
V
IH
V
IL
I
IN
V
kΩ
V
V
µA
1
DIGITAL INPUTS (MUTE,
SHDN,
HPS_EN, GAINA/B, IN1/2)
V
IH
V
IL
I
IN
V
V
µA
_______________________________________________________________________________________
3
Stereo 3W Audio Power Amplifiers with
Headphone Drive and Input Mux
MAX9760–MAX9763
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= PV
DD
= 5.0V, GND = PGND = 0V,
SHDN
= 5V, C
BIAS
= 1µF, R
IN
= R
F
= 15kΩ, R
L
=
∞.
T
A
= T
MIN
to T
MAX
, unless otherwise
noted. Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER
Input Voltage High
Input Voltage Low
Input Hysteresis
Input High Leakage Current
Input Low Leakage Current
Input Capacitance
Output Voltage Low
Output Current High
Serial Clock Frequency
Bus Free Time Between STOP
and START Conditions
START Condition Hold Time
START Condition Setup Time
Clock Period Low
Clock Period High
Data Setup Time
Data Hold Time
Receive SCL/SDA Rise Time
Receive SCL/SDA Fall Time
Transmit SDA Fall Time
Pulse Width of Suppressed
Spike
I
IH
I
IL
C
IN
V
OL
I
OH
f
SCL
t
BUF
t
HD:STA
t
SU:STA
t
LOW
t
HIGH
t
SU:DAT
t
HD:DAT
t
r
t
f
t
f
t
SP
(Note 4)
(Note 5)
(Note 5)
(Note 5)
(Note 6)
1.3
0.6
0.6
1.3
0.6
100
0
20 +
0.1C
B
20 +
0.1C
B
20 +
0.1C
B
50
0.9
300
300
250
I
OL
= 3mA
V
OH
= 5V
V
IN
= 5V
V
IN
= 0V
10
0.4
1
400
SYMBOL
V
IH
V
IL
0.2
±1
±1
CONDITIONS
MIN
2.6
0.8
TYP
MAX
UNITS
V
V
V
µA
µA
pF
V
µA
kHz
µs
µs
µs
µs
µs
ns
µs
ns
ns
ns
ns
2-WIRE SERIAL INTERFACE (SCL, SDA, ADD,
INT)
(MAX9760/MAX9762)
TIMING CHARACTERISTICS (MAX9760/MAX9762)
Note 1:
Note 2:
Note 3:
Note 4:
All devices are 100% production tested at +25°C. All temperature limits are guaranteed by design.
PSRR is specified with the amplifier inputs connected to GND through R
IN
and C
IN
.
Refer to the SV
DD
section.
A master device must provide a hold time of at least 300ns for the SDA signal to bridge the undefined region of SCL’s falling
edge.
Note 5:
C
B
= total capacitance of one of the bus lines in picofarads. Device tested with C
B
= 400pF. 1kΩ pullup resistors connected
from SDA/SCL to V
DD
.
Note 6:
Input filters on SDA, SCL, and ADD suppress noise spikes of less than 50ns.
4
_______________________________________________________________________________________
Stereo 3W Audio Power Amplifiers with
Headphone Drive and Input Mux
Typical Operating Characteristics
(V
DD
= PV
DD
= 5V, T
A
= +25°C, unless otherwise noted.)
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY (SPEAKER MODE)
MAX9760 toc01
MAX9760–MAX9763
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY (SPEAKER MODE)
MAX9760 toc02
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY (SPEAKER MODE)
R
L
= 4Ω
A
V
= 2V/V
MAX9760 toc03
1
R
L
= 3Ω
A
V
= 2V/V
0.1
THD+N (%)
1
R
L
= 3Ω
A
V
= 4V/V
1
0.1
THD+N (%)
P
OUT
= 500mW
P
OUT
= 1W
P
OUT
= 500mW P
OUT
= 1W
THD+N (%)
0.1
P
OUT
= 250mW P
OUT
= 500mW
0.01
P
OUT
= 2W
P
OUT
= 2.5W
P
OUT
= 1W
0.001
10
100
1k
FREQUENCY (Hz)
10k
100k
10
100
1k
FREQUENCY (Hz)
10k
100k
P
OUT
= 2W
0.01
P
OUT
= 2W
P
OUT
= 2.5W
0.01
0.001
10
100
1k
FREQUENCY (Hz)
10k
100k
0.001
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY (SPEAKER MODE)
MAX9760 toc04
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY (SPEAKER MODE)
MAX9760 toc05
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY (SPEAKER MODE)
R
L
= 8Ω
A
V
= 4V/V
MAX9760 toc06
1
R
L
= 4Ω
A
V
= 4V/V
1
R
L
= 8Ω
A
V
= 2V/V
1
0.1
THD+N (%)
THD+N (%)
P
OUT
= 250mW P
OUT
= 500mW
0.1
THD+N (%)
0.1
P
OUT
= 250mW
0.01
P
OUT
= 1.2W
P
OUT
= 500mW
P
OUT
= 250mW P
OUT
= 500mW
0.01
0.01
P
OUT
= 1W
0.001
10
100
1k
FREQUENCY (Hz)
10k
100k
P
OUT
= 2W
P
OUT
= 1W P
OUT
= 1.2W
0.001
10
100
1k
FREQUENCY (Hz)
10k
100k
0.001
10
P
OUT
= 1W
100
1k
FREQUENCY (Hz)
10k
100k
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER (SPEAKER MODE)
MAX9760 toc07
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER (SPEAKER MODE)
MAX9760 toc08
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER (SPEAKER MODE)
A
V
= 2V/V
R
L
= 4Ω
10
MAX9760 toc09
100
A
V
= 2V/V
R
L
= 3Ω
10
100
A
V
= 4V/V
R
L
= 3Ω
10
100
THD+N (%)
THD+N (%)
1
f = 10kHz
f = 20Hz
1
f = 1kHz
0.1
THD+N (%)
f = 10kHz
1
0.1
0.1
f = 1kHz
f = 10kHz
0.01
f = 1kHz
0.01
f = 20Hz
0.001
0.01
f = 20Hz
0.001
0
1
2
OUTPUT POWER (W)
3
4
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
OUTPUT POWER (W)
0.001
0
1
2
OUTPUT POWER (W)
3
4
_______________________________________________________________________________________
5
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