19-2618; Rev 1; 4/03
80mW, Fixed-Gain, DirectDrive, Stereo
Headphone Amplifier with Shutdown
General Description
The MAX4411 fixed-gain, stereo headphone amplifier is
designed for portable equipment where board space is
at a premium. The MAX4411 uses a unique, patented
DirectDrive architecture to produce a ground-refer-
enced output from a single supply, eliminating the need
for large DC-blocking capacitors, saving cost, board
space, and component height. Additionally, the gain of
the amplifier is set internally (-1.5V/V, MAX4411 and
-2V/V, MAX4411B), further reducing component count.
The MAX4411 delivers up to 80mW per channel into a
16Ω load and has low 0.003% THD+N. An 86dB at
217Hz power-supply rejection ratio (PSRR) allows this
device to operate from noisy digital supplies without an
additional linear regulator. The MAX4411 includes
±8kV
ESD protection on the headphone outputs. Com-
prehensive click-and-pop circuitry suppresses audible
clicks and pops on startup and shutdown. Independent
left/right, low-power shutdown controls make it possible
to optimize power savings in mixed-mode, mono/stereo
applications.
The MAX4411 operates from a single 1.8V to 3.6V supply,
consumes only 5mA of supply current, has short-circuit
and thermal-overload protection, and is specified over the
extended -40°C to +85°C temperature range. The
MAX4411 is available in a tiny (2mm
✕
2mm
✕
0.6mm),
16-bump chip-scale package (UCSP™) and a 20-pin thin
QFN package (4mm
✕
4mm
✕
0.8mm).
Features
o
No Bulky DC-Blocking Capacitors Required
o
Fixed -1.5V/V Gain Eliminates External Feedback
Network
MAX4411: -1.5V/V
MAX4411B: -2V/V
o
Ground-Referenced Outputs Eliminate DC-Bias
Voltages on Headphone Ground Pin
o
No Degradation of Low-Frequency Response Due
to Output Capacitors
o
80mW per Channel into 16Ω
o
Low 0.003% THD+N
o
High PSRR (86dB at 217Hz)
o
Integrated Click-and-Pop Suppression
o
1.8V to 3.6V Single-Supply Operation
o
Low Quiescent Current (5mA)
o
Independent Left/Right, Low-Power
Shutdown Controls
o
Short-Circuit and Thermal-Overload Protection
o
±8kV
ESD-Protected Amplifier Outputs
o
Available in Space-Saving Packages
16-Bump UCSP (2mm
✕
2mm
✕
0.6mm)
20-Pin Thin QFN (4mm
✕
4mm
✕
0.8mm)
MAX4411
Ordering Information
PART
MAX4411EBE-T
MAX4411ETP
MAX4411BEBE-T
MAX4411BETP
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN/BUMP-
PACKAGE
16 UCSP-16
20 Thin QFN
16 UCSP-16
20 Thin QFN
GAIN
(V/V)
-1.5
-1.5
-2
-2
Applications
Notebook PCs
Cellular Phones
PDAs
MP3 Players
Smart Phones
Portable Audio Equipment
UCSP is a trademark of Maxim Integrated Products, Inc.
Functional Diagram
LEFT
AUDIO
INPUT
DirectDrive OUTPUTS
ELIMINATE DC-BLOCKING
CAPACITORS
SHDNL
SHDNR
MAX4411
RIGHT
AUDIO
INPUT
FIXED GAIN ELIMINATES
EXTERNAL RESISTOR
NETWORK
Pin Configurations and Typical Application Circuit appear at end of data sheet.
________________________________________________________________
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.
80mW, Fixed-Gain, DirectDrive, Stereo
Headphone Amplifier with Shutdown
MAX4411
ABSOLUTE MAXIMUM RATINGS
PGND to SGND .....................................................-0.3V to +0.3V
PV
DD
to SV
DD .................................................................
-0.3V to +0.3V
PV
SS
to SV
SS
.........................................................-0.3V to +0.3V
PV
DD
and SV
DD
to PGND or SGND .........................-0.3V to +4V
PV
SS
and SV
SS
to PGND or SGND ..........................-4V to +0.3V
IN_ to SGND ................................(SV
SS
- 0.3V) to (SV
DD
+ 0.3V)
SHDN_
to SGND........................(SGND - 0.3V) to (SV
DD
+ 0.3V)
OUT_ to SGND .............................(SV
SS
- 0.3V) to (SV
DD
+0.3V)
C1P to PGND.............................(PGND - 0.3V) to (PV
DD
+ 0.3V)
C1N to PGND .............................(PV
SS
- 0.3V) to (PGND + 0.3V)
Output Short Circuit to GND or V
DD
...........................Continuous
Continuous Power Dissipation (T
A
= +70°C)
16-Bump UCSP (derate 7.4mW/°C above +70°C)........589mW
20-Pin Thin QFN (derate 16.9mW/°C above +70°C) ..1349mW
Junction Temperature ......................................................+150°C
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range .............................-65°C to +150°C
Bump Temperature (soldering)
Reflow ..........................................................................+230°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
= SV
DD
= 3V, PGND = SGND = 0V,
SHDNL
=
SHDNR
= SV
DD
, C1 = C2 = 2.2µF, C
IN
= 1µF, 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
Shutdown Supply Current
SYMBOL
V
DD
I
DD
I
SHDN
CONDITIONS
Guaranteed by PSRR test
One channel enabled
Two channels enabled
SHDNL
=
SHDNR
= GND
V
IH
SHDN_
Thresholds
V
IL
SHDN_
Input Leakage Current
SHDN_
to Full Operation
CHARGE PUMP
Oscillator Frequency
AMPLIFIERS
Voltage Gain
Gain Match
Total Output Offset Voltage
Input Resistance
A
V
∆A
V
V
OS
R
IN
1.8V
≤
V
DD
≤
3.6V,
MAX4411
Power-Supply Rejection Ratio
PSRR
V
DD
= 3.0V, 200mV
P-P
ripple, MAX4411
(Note 3)
DC (Note 2)
f
RIPPLE
= 217Hz
f
RIPPLE
= 1kHz
f
RIPPLE
= 20kHz
Input AC-coupled
MAX4411
MAX4411B
10
72
MAX4411
MAX4411B
-1.55
-2.1
-1.5
-2
1
0.7
0.75
14
86
86
75
53
dB
2.8
3.0
19
-1.45
-1.9
V/V
%
mV
kΩ
f
OSC
272
320
368
kHz
t
SON
-1
175
0.7 x
SV
DD
0.3 x
SV
DD
+1
µA
µs
MIN
1.8
3.2
5
6
8.4
10
TYP
MAX
3.6
UNITS
V
mA
µA
V
2
_______________________________________________________________________________________
80mW, Fixed-Gain, DirectDrive, Stereo
Headphone Amplifier with Shutdown
ELECTRICAL CHARACTERISTICS (continued)
(PV
DD
= SV
DD
= 3V, PGND = SGND = 0V,
SHDNL
=
SHDNR
= SV
DD
, C1 = C2 = 2.2µF, C
IN
= 1µF, 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
1.8V
≤
V
DD
≤
3.6V,
MAX4411B
Power-Supply Rejection Ratio
PSRR
V
DD
= 3.0V, 200mV
P-P
ripple, MAX4411B
(Note 3)
THD+N
≤
1%
T
A
= +25°C
DC (Note 2)
f
RIPPLE
= 217Hz
f
RIPPLE
= 1kHz
f
RIPPLE
= 20kHz
R
L
= 32Ω
R
L
= 16Ω
R
L
= 32Ω, P
OUT
=
50mW
THD+N
f
IN
= 1kHz
R
L
= 16Ω, P
OUT
=
60mW
MAX4411
MAX4411B
55
MIN
69
TYP
86
86
73
51
65
80
0.003
%
0.004
94
dB
95
0.8
No sustained oscillations
R
L
= 16Ω, P
OUT
= 1.6mW, f
IN
= 10kHz
150
90
140
15
Human Body Model (OUTR, OUTL)
±8
V/µs
pF
dB
°C
°C
kV
mW
dB
MAX
UNITS
MAX4411
Output Power
P
OUT
Total Harmonic Distortion Plus
Noise
Signal-to-Noise Ratio
Slew Rate
Maximum Capacitive Load
Crosstalk
Thermal Shutdown Threshold
Thermal Shutdown Hysteresis
ESD Protection
SNR
SR
C
L
R
L
= 32Ω, P
OUT
=
20mW, f
IN
= 1kHz,
BW = 22Hz to 22kHz
Note 1:
All specifications are 100% tested at T
A
= +25°C; temperature limits are guaranteed by design.
Note 2:
Inputs are connected directly to GND.
Note 3:
Inputs are AC-coupled to ground.
Typical Operating Characteristics
(
C1 = C2 = 2.2µF, THD+N measurement bandwidth = 22Hz to 22kHz, T
A
= +25°C, unless otherwise noted.
)
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY
MAX4411 toc01
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY
MAX4411 toc02
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY
V
DD
= 1.8V
R
L
= 16Ω
MAX4411 toc03
1
V
DD
= 3V
R
L
= 16Ω
1
V
DD
= 3V
R
L
= 32Ω
1
THD+N (%)
THD+N (%)
THD+N (%)
0.1
P
OUT
= 10mW
P
OUT
= 25mW
0.01
0.1
0.1
P
OUT
= 5mW
P
OUT
= 10mW
0.01
P
OUT
= 5mW
0.01
P
OUT
= 10mW
P
OUT
= 50mW
0.001
10
100
1k
FREQUENCY (Hz)
10k
100k
0.001
10
100
P
OUT
= 25mW
0.001
1k
FREQUENCY (Hz)
10k
100k
10
P
OUT
= 20mW
100
1k
FREQUENCY (Hz)
10k
100k
_______________________________________________________________________________________
3
80mW, Fixed-Gain, DirectDrive, Stereo
Headphone Amplifier with Shutdown
MAX4411
Typical Operating Characteristics (continued)
(
C1 = C2 = 2.2µF, THD+N measurement bandwidth = 22Hz to 22kHz, T
A
= +25°C, unless otherwise noted.
)
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY
MAX4411 toc04
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER
MAX4411 toc05
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER
V
DD
= 3V
R
L
= 16Ω
f
IN
= 1kHz
OUTPUTS IN
PHASE
MAX4411 toc06
1
V
DD
= 1.8V
R
L
= 32Ω
100
10
V
DD
= 3V
R
L
= 16Ω
f
IN
= 20Hz
OUTPUTS 180°
OUT OF PHASE
OUTPUTS IN
PHASE
100
10
0.1
THD+N (%)
THD+N (%)
1
P
OUT
= 5mW
0.01
P
OUT
= 10mW
THD+N (%)
1
OUTPUTS 180°
OUT OF PHASE
0.1
0.1
0.01
P
OUT
= 20mW
0.001
10
100
1k
FREQUENCY (Hz)
10k
100k
0.001
0
50
100
ONE CHANNEL
DRIVEN
150
200
0.01
ONE CHANNEL
DRIVEN
0.001
0
50
100
150
200
OUTPUT POWER (mW)
OUTPUT POWER (mW)
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER
MAX4411 toc07
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER
MAX4411 toc08
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER
V
DD
= 3V
R
L
= 32Ω
f
IN
= 1kHz
OUTPUTS IN
PHASE
MAX4411 toc09
100
V
DD
= 3V
R
L
= 16Ω
f
IN
= 10kHz
OUTPUTS IN
PHASE
100
10
10
V
DD
= 3V
R
L
= 32Ω
f
IN
= 20Hz
100
OUTPUTS IN
PHASE
10
THD+N (%)
THD+N (%)
1
OUTPUTS 180°
OUT OF PHASE
0.1
1
THD+N (%)
1
0.1
OUTPUTS 180°
OUT OF PHASE
ONE CHANNEL
DRIVEN
0
25
50
75
100
125
0.1
OUTPUTS 180°
OUT OF PHASE
0.01
ONE CHANNEL
DRIVEN
0
50
100
150
200
0.01
0.01
ONE CHANNEL
DRIVEN
0
25
50
75
100
125
0.001
OUTPUT POWER (mW)
0.001
0.001
OUTPUT POWER (mW)
OUTPUT POWER (mW)
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER
MAX4411 toc10
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER
MAX4411 toc11
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER
V
DD
= 1.8V
R
L
= 16Ω
f
IN
= 1kHz
OUTPUTS IN
PHASE
MAX4411 toc12
100
100
10
V
DD
= 3V
R
L
= 32Ω
f
IN
= 10kHz
OUTPUTS IN
PHASE
10
V
DD
= 1.8V
R
L
= 16Ω
f
IN
= 20Hz
OUTPUTS IN
PHASE
100
10
THD+N (%)
THD+N (%)
1
OUTPUTS 180°
OUT OF PHASE
1
OUTPUTS 180°
OUT OF PHASE
0.1
THD+N (%)
1
OUTPUTS 180°
OUT OF PHASE
0.1
0.1
0.01
ONE CHANNEL
DRIVEN
0.001
0
25
50
75
100
125
OUTPUT POWER (mW)
0.01
ONE CHANNEL
DRIVEN
0
10
20
30
40
50
60
0.01
ONE CHANNEL
DRIVEN
0
10
20
30
40
50
60
0.001
0.001
OUTPUT POWER (mW)
OUTPUT POWER (mW)
4
_______________________________________________________________________________________
80mW, Fixed-Gain, DirectDrive, Stereo
Headphone Amplifier with Shutdown
Typical Operating Characteristics (continued)
(
C1 = C2 = 2.2µF, THD+N measurement bandwidth = 22Hz to 22kHz, T
A
= +25°C, unless otherwise noted.
)
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER
MAX4411 toc13
MAX4411
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER
MAX4411 toc14
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER
V
DD
= 1.8V
R
L
= 32Ω
f
IN
= 1kHz
OUTPUTS IN
PHASE
MAX4411 toc15
100
10
V
DD
= 1.8V
R
L
= 16Ω
f
IN
= 10kHz
100
100
OUTPUTS IN
PHASE
10
V
DD
= 1.8V
R
L
= 32Ω
f
IN
= 20Hz
OUTPUTS IN
PHASE
10
THD+N (%)
THD+N (%)
THD+N (%)
1
OUTPUTS 180°
OUT OF PHASE
1
1
0.1
0.1
OUTPUTS 180°
OUT OF PHASE
0.1
OUTPUTS 180°
OUT OF PHASE
ONE CHANNEL
DRIVEN
0.01
ONE CHANNEL
DRIVEN
0
10
20
30
40
50
60
0.01
ONE CHANNEL
DRIVEN
0.001
0
10
20
30
40
50
0.01
0.001
OUTPUT POWER (mW)
0.001
0
10
20
30
40
50
OUTPUT POWER (mW)
OUTPUT POWER (mW)
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER
V
DD
= 1.8V
R
L
= 32Ω
f
IN
= 10kHz
MAX4411 toc16
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
MAX4411 toc17
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
-10
-20
-30
PSRR (dB)
-40
-50
-60
-70
-80
-90
-100
V
DD
= 1.8V
R
L
= 16Ω
MAX4411 toc18
100
OUTPUTS IN
PHASE
0
-10
-20
-30
V
DD
= 3V
R
L
= 16Ω
0
10
THD+N (%)
1
OUTPUTS 180°
OUT OF PHASE
ONE CHANNEL
DRIVEN
PSRR (dB)
-40
-50
-60
-70
0.1
0.01
-80
-90
-100
50
10
100
1k
FREQUENCY (Hz)
10k
100k
0.001
0
10
20
30
40
OUTPUT POWER (mW)
10
100
1k
FREQUENCY (Hz)
10k
100k
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
MAX4411 toc19
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
MAX4411 toc20
CROSSTALK vs. FREQUENCY
V
DD
= 3V
P
OUT
= 1.6mW
R
L
= 16Ω
MAX4411 toc21
0
-10
-20
-30
PSRR (dB)
V
DD
= 3V
R
L
= 32Ω
0
-10
-20
-30
PSRR (dB)
0
-20
-40
CROSSTALK (dB)
-60
-80
-100
-120
-140
V
DD
= 1.8V
R
L
= 32Ω
-40
-50
-60
-70
-80
-90
-100
10
100
1k
FREQUENCY (Hz)
10k
100k
-40
-50
-60
-70
-80
-90
-100
10
100
1k
FREQUENCY (Hz)
10k
100k
LEFT TO RIGHT
RIGHT TO LEFT
10
100
1k
FREQUENCY (Hz)
10k
100k
_______________________________________________________________________________________
5
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