General Description
The MAX9777/MAX9778 combine a stereo 3W bridgetied load (BTL) audio power amplifier, stereo singleended (SE) headphone amplifier, headphone sensing,
and a 2:1 input multiplexer all in a tiny 28-pin thin QFN
package. These devices operate from a single 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-distortion
amplification of the audio signal. Click-and-pop suppression minimizes 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 shutdown 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 headphone 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 flexibility 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 I2C-compatible (MAX9777) or
simple parallel control interface (MAX9778).
The MAX9777/MAX9778 are available in a thermally
efficient 28-pin thin QFN package (5mm x 5mm x
0.8mm). These devices have thermal-overload protection (OVP) and are specified over the extended -40°C
to +85°C temperature range.
Features
♦ Industry-Leading, Ultra-High 100dB PSRR
♦ 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
x 5mm x 0.8mm)
Package
MAX9777/MAX9778
Stereo 3W Audio Power Amplifiers with
Headphone Drive and Input Mux
________________________________________________________________
Maxim Integrated Products
1
SE/
BTL
SINGLE SUPPLY
4.5V TO 5.5V
I
2
C-
COMPATIBLE
MAX9777
LEFT IN1
LEFT IN2
RIGHT IN1
RIGHT IN2
CONTROL
Simplified Block Diagram
Ordering Information
19-0509; Rev 0; 4/06
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.
µ
PART
CONTROL
INTERFACE
PINPACKAGE
PK G
C O D E
MAX9777ETI+
T2855-6
MAX9778ETI+
Parallel
T2855-6
Pin Configurations and Functional Diagrams appear at end
of data sheet.
Note: All devices are specified over the -40°C to +85°C operating temperature range.
+Denotes lead-free package.
*EP = Exposed paddle.
Notebooks
Portable DVD Players
Tablet PCs
PC Audio Peripherals
Camcorders
Multimedia Monitor
Applications
I2C Compatible 28 Thi n QFN - E P *
28 Thi n QFN - E P *
MAX9777/MAX9778
Stereo 3W Audio Power Amplifiers with
Headphone Drive and Input Mux
2
______________________________________________________________________________________________________________________________________________________________________________
AABBSSOOLLUUTTEE MMAAXXIIMMUUMM RRAATTIINNGGSS
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.
VDDto GND ...........................................................................+6V
PV
DD
to VDD.......................................................................±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
OUT__ Short Circuit to GND, V
DD
..........................................10s
Short Circuit Between OUT_+ and OUT_- .................Continuous
Continuous Power Dissipation (T
A
= +70°C)
28-Pin TQFN, Multilayer Board
(derate 34.5mW/°C above +70°C)..........................2758.6mW
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
ELECTRICAL CHARACTERISTICS
(VDD= PVDD= 5.0V, GND = PGND = 0V, V
SHDN
= 5V, C
BIAS
= 1µF, RIN= RF= 15kΩ, RL= ∞. TA= 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
Supply Voltage Range VDD/PVDDInferred from PSRR test 4.5 5.5 V
BTL mode, HPS = 0V, MAX9777/MAX9778 13 32
Quiescent Supply Current
(I
VDD
+ I
PVDD
)
I
DD
Single-ended mode, HPS = V
DD
718
mA
Shutdown Current I
SHDN
SHDN = GND 10 50 µA
Switching Time t
SW
Gain or input switching 10 µs
C
BIAS
= 1µF 300
Turn-On Time t
ON
C
BIAS
= 0.1µF 30
ms
Thermal Shutdown Threshold +160
o
C
Thermal Shutdown Hysteresis 15
o
C
OUTPUT AMPLIFIERS (SPEAKER MODE, HPS = GND)
Output Offset Voltage V
OS
OUT_+ - OUT_-, AV = 1V/V ±4 ±32 mV
VDD = 4.5V to 5.5V 75 100
f = 1kHz, V
RIPPLE
= 200mV
P-P
82
Power-Supply Rejection Ratio
(Note 2)
PSRR
f = 20kHz, V
RIPPLE
= 200mV
P-P
70
dB
RL = 8Ω 1.4
RL = 4Ω 2.6Output Power P
OUT
fIN = 1kHz,
THD+N < 1%,
T
A
= +25°C
R
L
= 3Ω 3
W
P
OUT
= 1W, RL = 8Ω 0.005
Total Harmonic Distortion Plus
Noise
THD+N
f
IN
= 1kHz, BW =
22Hz to 22kHz
P
OUT
= 2W, RL = 4Ω 0.01
%
Signal-to-Noise Ratio SNR RL = 8Ω, P
OUT
= 1W, BW = 22Hz to 22kHz 95 dB
Slew Rate SR 1.6 V/µs
Maximum Capacitive Load Drive C
L
No sustained oscillations 1 nF
Crosstalk fIN = 10kHz 73 dB
Into shutdown -50
Click/Pop Level K
CP
Peak voltage, A-weighted,
32 samples per second
(Notes 2, 6)
Out of shutdown -65
dBV
MAX9777/MAX9778
Stereo 3W Audio Power Amplifiers with
Headphone Drive and Input Mux
______________________________________________________________________________________________________________________________________________________________________________
3
ELECTRICAL CHARACTERISTICS (continued)
(VDD= PVDD= 5.0V, GND = PGND = 0V, V
SHDN
= 5V, C
BIAS
= 1µF, RIN= RF= 15kΩ, RL= ∞. TA= 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
OUTPUT AMPLIFIERS (HEADPHONE MODE, HPS = VDD)
VDD = 4.5V to 5.5V 75 106
f = 1kHz, V
RIPPLE
= 200mV
P-P
88
Power-Supply Rejection Ratio
(Note 2)
PSRR
f = 20kHz, V
RIPPLE
= 200mV
P-P
76
dB
RL = 32Ω 88
Output Power P
OUT
fIN = 1kHz, THD+N <
1%, T
A
= +25°C
R
L
= 16Ω 200
mW
P
OUT
= 60mW,
R
L
= 32Ω
0.002
Total Harmonic Distortion Plus
Noise
THD+N
fIN = 1kHz,
BW = 22Hz to 22kHz
P
OUT
= 125mW,
R
L
= 16Ω
0.002
%
Signal-to-Noise Ratio SNR
R
L
= 32Ω, BW = 22Hz to 22kHz,
V
OUT
= 1V
RMS
92 dB
Slew Rate SR 1.8 V/µs
Maximum Capacitive Load Drive C
L
No sustained oscillations 2 nF
Crosstalk fIN = 10kHz 78 dB
BIAS VOLTAGE (BIAS)
BIAS Voltage V
BIAS
2.35 2.5 2.65 V
Output Resistance R
BIAS
50 kΩ
DIGITAL INPUTS (MUTE, SHDN, HPS_EN, GAINA/B, IN1111/2)
Input-Voltage High V
IH
2V
Input-Voltage Low V
IL
0.8 V
Input Leakage Current I
IN
±1µA
HEADPHONE SENSE INPUT (HPS)
Input-Voltage High V
IH
0.9 x
V
DD
V
Input-Voltage Low V
IL
0.7 x
V
DD
V
Input Leakage Current I
IN
±1µA
Into shutdown -70
Click/Pop Level K
CP
Peak voltage, A-weighted,
32 samples per second
(Notes 2, 4)
Out of shutdown -52
dBV
MAX9777/MAX9778
Stereo 3W Audio Power Amplifiers with
Headphone Drive and Input Mux
4
______________________________________________________________________________________________________________________________________________________________________________
ELECTRICAL CHARACTERISTICS (continued)
(VDD= PVDD= 5.0V, GND = PGND = 0V, V
SHDN
= 5V, C
BIAS
= 1µF, RIN= RF= 15kΩ, RL= ∞. TA= 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
2-WIRE SERIAL INTERFACE (SCL, SDA, ADD, INT) (MAX9777)
Input-Voltage High V
IH
2.6 V
Input-Voltage Low V
IL
0.8 V
Input Hysteresis 0.2 V
Input High Leakage Current I
IH
VIN = 5V ±1µA
Input Low Leakage Current I
IL
VIN = 0V ±1µA
Input Capacitance C
IN
10 pF
Output-Voltage Low V
OL
IOL = 3mA 0.4 V
Output Current High I
OH
VOH = 5V 1 µA
TIMING CHARACTERISTICS (MAX9777)
Serial Clock Frequency f
SCL
400 kHz
Bus Free Time Between STOP
and START Conditions
t
BUF
1.3 µs
START Condition Hold Time t
HD:STA
0.6 µs
START Condition Setup Time t
SU:STA
0.6 µs
Clock Period Low t
LOW
1.3 µs
Clock Period High t
HIGH
0.6 µs
Data Setup Time t
SU:DAT
100 ns
Data Hold Time t
HD:DAT
(Note 3) 0 0.9 µs
Receive SCL/SDA Rise Time t
r
(Note 4)
20 +
0.1C
B
300 ns
Receive SCL/SDA Fall Time t
f
(Note 4)
20 +
0.1C
B
300 ns
Transmit SDA Fall Time t
f
(Note 4)
20 +
0.1C
B
250 ns
Pulse Width of Suppressed
Spike
t
SP
(Note 5) 50 ns
Note 1: All devices are 100% production tested at +25°C. All temperature limits are guaranteed by design.
Note 2: Inputs AC-coupled to GND.
Note 3: 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 4: C
B
= total capacitance of one of the bus lines in picofarads. Device tested with CB= 400pF. 1kΩ pullup resistors connected
from SDA/SCL to V
DD
.
Note 5: Input filters on SDA, SCL, and ADD suppress noise spikes of less than 50ns.
Note 6: Headphone mode testing performed with 32Ω resistive load connected to GND. Speaker mode testing performed with 8Ω
resistive load connected to GND. Mode transitions are controlled by SHDN. KCP level is calculated as 20log[(peak voltage
during mode transition, no input signal)/1V
RMS
]. Units are expressed in dBV.
MAX9777/MAX9778
Stereo 3W Audio Power Amplifiers with
Headphone Drive and Input Mux
_______________________________________________________________________________________
5
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY (SPEAKER MODE)
MAX9777/78 toc01
FREQUENCY (Hz)
THD+N (%)
10k1k100
0.01
0.1
1
0.001
10 100k
RL = 3
Ω
A
V
= 2V/V
P
OUT
= 2.5WP
OUT
= 2W
P
OUT
= 500mW
P
OUT
= 1W
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY (SPEAKER MODE)
MAX9777/78 toc02
FREQUENCY (Hz)
THD+N (%)
10k1k100
0.01
0.1
1
0.001
10 100k
RL = 3Ω
A
V
= 4V/V
P
OUT
= 2.5W
P
OUT
= 2W
P
OUT
= 500mW
P
OUT
= 1W
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY (SPEAKER MODE)
MAX9777/78 toc03
FREQUENCY (Hz)
THD+N (%)
10k1k100
0.01
0.1
1
0.001
10 100k
RL = 4Ω
A
V
= 2V/V
P
OUT
= 2W
P
OUT
= 1W
P
OUT
= 500mW
P
OUT
= 250mW
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY (SPEAKER MODE)
MAX9777/78 toc04
FREQUENCY (Hz)
THD+N (%)
10k1k100
0.01
0.1
1
0.001
10 100k
RL = 4Ω
A
V
= 4V/V
P
OUT
= 250mW
P
OUT
= 2W
P
OUT
= 1W
P
OUT
= 500mW
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY (SPEAKER MODE)
MAX9777/78 toc05
FREQUENCY (Hz)
THD+N (%)
10k1k100
0.01
0.1
1
0.001
10 100k
RL = 8Ω
A
V
= 2V/V
P
OUT
= 250mW
P
OUT
= 1.2W
P
OUT
= 1W
P
OUT
= 500mW
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY (SPEAKER MODE)
MAX9777/78 toc06
FREQUENCY (Hz)
THD+N (%)
10k1k100
0.01
0.1
1
0.001
10 100k
P
OUT
= 250mW
P
OUT
= 1.2W
P
OUT
= 1W
P
OUT
= 500mW
RL = 8Ω
A
V
= 4V/V
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER (SPEAKER MODE)
MAX9777/78 toc07
OUTPUT POWER (W)
THD+N (%)
321
0.01
10
1
0.1
100
0.001
04
AV = 2V/V
R
L
= 3Ω
f = 1kHz
f = 20Hz
f = 10kHz
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER (SPEAKER MODE)
MAX9777/78 toc08
OUTPUT POWER (W)
THD+N (%)
321
0.01
10
1
0.1
100
0.001
04
AV = 4V/V
R
L
= 3Ω
f = 20Hz
f = 1kHz
f = 10kHz
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER (SPEAKER MODE)
MAX9777/78 toc09
OUTPUT POWER (W)
THD+N (%)
2.5 3.02.01.51.00.5
0.01
10
1
0.1
100
0.001
0 3.5
AV = 2V/V
R
L
= 4Ω
f = 20Hz
f = 1kHz
f = 10kHz
Typical Operating Characteristics
(VDD= PVDD= 5V, GND = PGND = 0V, V
SHDN
= 5V, C
BIAS
= 1µF, TA = +25°C, unless otherwise noted.)
MAX9777/MAX9778
Stereo 3W Audio Power Amplifiers with
Headphone Drive and Input Mux
6
______________________________________________________________________________________________________________________________________________________________________________
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER (SPEAKER MODE)
MAX9777/78 toc10
OUTPUT POWER (W)
THD+N (%)
2.5 3.02.01.51.00.5
0.01
10
1
0.1
100
0.001
0 3.5
AV = 4V/V
R
L
= 4Ω
f = 20Hz
f = 1kHz
f = 10kHz
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER (SPEAKER MODE)
MAX9777/78 toc11
OUTPUT POWER (W)
THD+N (%)
1.51.00.5
0.01
10
1
0.1
100
0.001
0 2.0
AV = 2V/V
R
L
= 8Ω
f = 20Hz
f = 1kHz
f = 10kHz
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER (SPEAKER MODE)
MAX9777/78 toc12
OUTPUT POWER (W)
THD+N (%)
1.51.00.5
0.01
10
1
0.1
100
0.001
0 2.0
AV = 4V/V
R
L
= 8Ω
f = 20Hz
f = 1kHz
f = 10kHz
OUTPUT POWER vs. AMBIENT TEMPERATURE
(SPEAKER MODE)
MAX9777/78 toc13
AMBIENT TEMPERATURE (°C)
OUTPUT POWER (W)
603510-15
1
2
3
4
0
-40 85
THD+N = 10%
THD+N = 1%
f = 1kHz
R
L
= 3Ω
OUTPUT POWER vs. AMBIENT TEMPERATURE
(SPEAKER MODE)
MAX9777/78 toc14
AMBIENT TEMPERATURE (°C)
OUTPUT POWER (W)
603510-15
1
2
3
4
0
-40 85
THD+N = 10%
THD+N = 1%
f = 1kHz
R
L
= 4Ω
OUTPUT POWER vs. AMBIENT TEMPERATURE
(SPEAKER MODE)
MAX9777/78 toc15
AMBIENT TEMPERATURE (°C)
OUTPUT POWER (W)
603510-15
0.5
1.0
1.5
2.0
0
-40 85
THD+N = 10%
THD+N = 1%
f = 1kHz
R
L
= 8Ω
OUTPUT POWER vs. LOAD RESISTANCE
(SPEAKER MODE)
MAX9777/78 toc16
LOAD RESISTANCE (Ω)
OUTPUT POWER (W)
10k1k10010
1
2
3
4
5
0
1 100k
f = 1kHz
THD+N = 10%
THD+N = 1%
POWER DISSIPATION vs. OUTPUT POWER
(SPEAKER MODE)
MAX9777/78 toc17
OUTPUT POWER (W)
POWER DISSIPATION (W)
2.50.5 1.0 1.5 2.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
0
0
RL = 4Ω
f = 1kHz
Typical Operating Characteristics (continued)
(VDD= PVDD= 5V, GND = PGND = 0V, V
SHDN
= 5V, C
BIAS
= 1µF, TA = +25°C, unless otherwise noted.)
MAX9777/MAX9778
Stereo 3W Audio Power Amplifiers with
Headphone Drive and Input Mux
_______________________________________________________________________________________
7
CROSSTALK vs. FREQUENCY
(SPEAKER MODE)
MAX9777/78 toc19
FREQUENCY (Hz)
CROSSTALK (dB)
10k1k100
-110
-100
-90
-80
-70
-60
-50
-40
-120
10 100k
VIN = 200mV
P-P
RL = 8Ω
RIGHT TO LEFT
LEFT TO RIGHT
ENTERING SHUTDOWN (SPEAKER MODE)
MAX9777/78 toc20
400ms/div
V
DD
2V/div
OUT_+ AND OUT_-
1V/div
OUT_+ - OUT_-
200mV/div
EXITING SHUTDOWN (SPEAKER MODE)
MAX9777/78 toc21
100ms/div
OUT_+ AND OUT_-
1V/div
OUT_+ - OUT_-
500mV/div
SHDN
2V/div
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY (HEADPHONE MODE)
MAX9777/78 toc22
FREQUENCY (Hz)
THD+N (%)
10k1k100
0.001
0.01
0.1
1
0.0001
10 100k
RL = 16Ω
A
V
= 1V/V
P
OUT
= 50mW
P
OUT
= 25mW
P
OUT
= 100mW
P
OUT
= 150mW
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY (HEADPHONE MODE)
MAX9777/78 toc23
FREQUENCY (Hz)
THD+N (%)
10k1k100
0.001
0.01
0.1
1
0.0001
10 100k
RL = 16Ω
A
V
= 2V/V
P
OUT
= 50mW
P
OUT
= 25mW
P
OUT
= 100mW
P
OUT
= 150mW
Typical Operating Characteristics (continued)
(VDD= PVDD= 5V, GND = PGND = 0V, V
SHDN
= 5V, C
BIAS
= 1µF, TA = +25°C, unless otherwise noted.)
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY (SPEAKER MODE)
MAX9777/78 toc18
FREQUENCY (Hz)
PSRR (dB)
10k1k100
90
80
70
60
50
40
100
10 100k
V
RIPPLE
= 200mV
P-P
MAX9777/MAX9778
Stereo 3W Audio Power Amplifiers with
Headphone Drive and Input Mux
8
______________________________________________________________________________________________________________________________________________________________________________
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER (HEADPHONE MODE)
MAX9777/78 toc28
OUTPUT POWER (mW)
THD+N (%)
100755025
0.01
0.001
10
1
0.1
100
0.0001
0 125
AV = 1V/V
R
L
= 32Ω
f = 20Hz
f = 1kHz
f = 10kHz
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER (HEADPHONE MODE)
MAX9777/78 toc29
OUTPUT POWER (mW)
THD+N (%)
100755025
0.01
0.001
10
1
0.1
100
0.0001
0 125
AV = 2V/V
R
L
= 32Ω
f = 20Hz
f = 1kHz
f = 10kHz
OUTPUT POWER vs. AMBIENT TEMPERATURE
(HEADPHONE MODE)
MAX9777/78 toc30
AMBIENT TEMPERATURE (°C)
OUTPUT POWER (mW)
603510-15
50
100
200
150
250
300
0
-40 85
THD+N = 10%
THD+N = 1%
f = 1kHz
R
L
= 16Ω
OUTPUT POWER vs. AMBIENT TEMPERATUR
E
(HEADPHONE MODE)
MAX9777/78 toc331
AMBIENT TEMPERATURE (°C)
OUTPUT POWER (mW)
603510-15
25
50
100
75
125
150
0
-40 85
THD+N = 10%
THD+N = 1%
f = 1kHz
R
L
= 32Ω
OUTPUT POWER vs. LOAD RESISTANCE
(HEADPHONE MODE)
MAX9777/78 toc32
LOAD RESISTANCE (Ω)
OUTPUT POWER (mW)
1k10010
100
200
300
400
500
600
0
1 10k
f = 1kHz
THD+N = 10%
THD+N = 1%
Typical Operating Characteristics (continued)
(VDD= PVDD= 5V, GND = PGND = 0V, V
SHDN
= 5V, C
BIAS
= 1µF, TA = +25°C, unless otherwise noted.)
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY (HEADPHONE MODE)
MAX9777/78 toc25
FREQUENCY (Hz)
THD+N (%)
10k1k100
0.001
0.01
0.1
1
0.0001
10 100k
RL = 32Ω
A
V
= 2V/V
P
OUT
= 50mW
P
OUT
= 25mW
P
OUT
= 100mW
P
OUT
= 150mW
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER (HEADPHONE MODE)
MAX9777/78 toc26
OUTPUT POWER (mW)
THD+N (%)
25020015010050
0.01
0.001
10
1
0.1
100
0.0001
0 300
AV = 1V/V
R
L
= 16Ω
f = 20Hz
f = 1kHz
f = 10kHz
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER (HEADPHONE MODE)
MAX9777/78 toc27
OUTPUT POWER (mW)
THD+N (%)
25020015010050
0.01
0.001
10
1
0.1
100
0.0001
0 300
AV = 2V/V
R
L
= 16Ω
f = 20Hz
f = 1kHz
f = 10kHz
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY (HEADPHONE MODE)
MAX9777/78 toc24
FREQUENCY (Hz)
THD+N (%)
10k1k100
0.001
0.01
0.1
1
0.0001
10 100k
RL = 32Ω
A
V
= 1V/V
P
OUT
= 50mW
P
OUT
= 25mW
P
OUT
= 100mW
P
OUT
= 150mW
MAX9777/MAX9778
Stereo 3W Audio Power Amplifiers with
Headphone Drive and Input Mux
_______________________________________________________________________________________
9
EXITING SHUTDOWN (HEADPHONE MODE)
MAX9777/78 toc37
100ms/div
OUT_+
1V/div
HP JACK
200mV/div
SHDN
2V/div
RL = 16Ω
INPUT AC-COUPLED TO GND
ENTERING SHUTDOWN (HEADPHONE MODE)
MAX9777/78 toc38
100ms/div
OUT_+
1V/div
HP JACK
100mV/div
SHDN
2V/div
SUPPLY CURRENT vs. SUPPLY VOLTAGE
(SPEAKER MODE)
MAX9777/78 toc39
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (mA)
5.255.004.75
5
10
15
20
25
0
4.50 5.50
TA = +85°C
TA = +25°C
TA = -40°C
Typical Operating Characteristics (continued)
(VDD= PVDD= 5V, GND = PGND = 0V, V
SHDN
= 5V, C
BIAS
= 1µF, TA = +25°C, unless otherwise noted.)
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY (HEADPHONE MODE)
MAX9777/78 toc35
FREQUENCY (Hz)
PSRR (dB)
10k1k100
90
80
70
60
50
40
100
10 100k
V
RIPPLE
= 200mV
P-P
CROSSTALK vs. FREQUENCY
(HEADPHONE MODE)
MAX9777/78 toc36
FREQUENCY (Hz)
CROSSTALK (dB)
10k1k100
-110
-100
-90
-80
-70
-60
-50
-40
-120
10 100k
VIN = 200mV
P-P
RL = 16Ω
RIGHT TO LEFT
LEFT TO RIGHT
POWER DISSIPATION vs. OUTPUT POWER
(HEADPHONE MODE)
MAX9777/78 toc33
OUTPUT POWER (mW)
POWER DISSIPATION (mW)
50 100 150 200
20
40
60
80
100
120
0
0
RL = 16Ω
f = 1kHz
POWER DISSIPATION vs. OUTPUT POWER
(HEADPHONE MODE)
MAX9777/78 toc34
OUTPUT POWER (mW)
POWER DISSIPATION (mW)
10020 40 60 80
10
20
30
40
50
60
70
0
0
RL = 32Ω
f = 1kHz
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