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MAX4409
Technical data
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MAXIM MAX4409 Technical data

General Description
The MAX4409 stereo headphone amplifier combines Maxim’s DirectDrive™ architecture and a common­mode sense input, which allows the amplifier to reject common-mode noise. Conventional headphone ampli­fiers require a bulky DC-blocking capacitor between the headphone and the amplifier. DirectDrive produces a ground-referenced output from a single supply, elimi­nating the need for large DC-blocking capacitors, which saves cost, board space, and component height. The common-mode voltage sensing corrects for any difference between SGND of the amplifier and the headphone return. This feature minimizes ground-loop noise when the HP socket is used as a line out connec­tion to other grounded equipment, for example, a PC connected to a home hi-fi system.
The MAX4409 draws only 5mA of supply current, deliv­ers up to 80mW per channel into a 16Ω load, and has a low 0.002% THD+N. A high 86dB power-supply rejec­tion ratio allows this device to operate from noisy digital supplies without additional power-supply conditioning. The MAX4409 includes ±8kV ESD protection on the headphone outputs. Comprehensive click-and-pop cir­cuitry eliminates audible clicks and pops on startup and shutdown. A low-power shutdown mode reduces supply current draw to only 6µA.
The MAX4409 operates from a single 1.8V to 3.6V sup­ply, has short-circuit and thermal overload protection, and is specified over the extended -40°C to +85°C tem­perature range. The MAX4409 is available in tiny 20-pin thin QFN (4mm x 4mm x 0.8mm) and 14-pin TSSOP packages.
Applications
Features
♦ No Bulky DC-Blocking Capacitors Required ♦ Ground-Referenced Outputs Eliminate DC-Bias
Voltages on Headphone Ground Pin
♦ Common-Mode Voltage Sensing Eliminates
Ground-Loop Noise
♦ 96dB CMRR ♦ No Degradation of Low-Frequency Response Due
to Output Capacitors
♦ 80mW per Channel into 16Ω ♦ Low 0.002% THD+N ♦ High 86dB PSRR ♦ Integrated Click-and-Pop Suppression ♦ 1.8V to 3.6V Single-Supply Operation ♦ Low Quiescent Current ♦ Low-Power Shutdown Mode ♦ Short-Circuit and Thermal-Overload Protection ♦ ±8kV ESD-Protected Amplifier Outputs ♦ Available in Space-Saving Packages
14-Pin TSSOP 20-Pin Thin QFN (4mm x 4mm x 0.8mm)
MAX4409
80mW, DirectDrive, Stereo Headphone
Amplifier with Common-Mode Sense
________________________________________________________________ Maxim Integrated Products 1
LEFT
AUDIO
INPUT
RIGHT
AUDIO
INPUT
SHDN
COM
MAX4409
DirectDrive OUTPUTS ELIMINATE DC-BLOCKING CAPACITORS
COMMON-MODE SENSE INPUT ELIMINATES GROUND-LOOP NOISE
Functional Diagram
Ordering Information
19-2842; Rev 2; 11/07
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com
PART
PIN-PACKAGE
MAX4409ETP
20 Thin QFN-EP*
MAX4409EUD
14 TSSOP
Notebooks
Desktop PCs
Cellular Phones
PDAs
MP3 Players
Tablet PCs
Portable Audio Equipment
Pin Configurations and Typical Application Circuit appear at end of data sheet.
*EP = Exposed paddle.
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
MAX4409
80mW, DirectDrive, Stereo Headphone Amplifier with Common-Mode Sense
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(PVDD= SVDD= 3V, PGND = SGND = 0V, SHDN = SVDD, C1 = C2 = 2.2µF, RIN= RF= R1 = R2 = 10kΩ, RL= ∞, TA= T
MIN
to T
MAX
,
unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 2)
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.
PGND to SGND .....................................................-0.3V to +0.3V
PV
DD
to SV
DD .................................................................
-0.3V to +0.3V
PV
SS
to SVSS.........................................................-0.3V to +0.3V
PV
DD
and SVDDto PGND or SGND .........................-0.3V to +4V
PV
SS
and SVSSto PGND or SGND ..........................-4V to +0.3V
IN_ and COM to SGND.................................SV
SS
to (SVDD- 1V)
IN_ to COM .....................................(COM + 2V) to (COM - 0.3V)
SHDN_ to SGND........................(SGND - 0.3V) to (SV
DD
+ 0.3V)
OUT_ to SGND ............................(SV
SS
- 0.3V) to (SVDD+ 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
Thermal Limits (Note 1) Continuous Power Dissipation (T
A
= +70°C) 20-Pin Thin QFN Multilayer (derate 25.6mW/°C
above +70°C).............................................................2051mW
θ
JA
................................................................................39°C/W
θ
JC
...............................................................................5.7°C/W
14-Pin TSSOP Multilayer (derate 10mW/°C
above +70°C)...............................................................797mW
θ
JA
..............................................................................100°C/W
θ
JC
................................................................................30°C/W
Junction Temperature......................................................+150°C
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
PARAMETER
CONDITIONS
UNITS
Supply Voltage Range V
DD
Guaranteed by PSRR test
3.6 V
Quiescent Supply Current I
DD
5 8.4 mA
Shutdown Supply Current I
SHDN
SHDN = GND 6 10 µA
V
IH
0.7 x
SHDN Thresholds
V
IL
0.3 x
V
SHDN Input Leakage Current -1 +1 µA SHDN to Full Operation t
SON
µs
CHARGE PUMP
Oscillator Frequency f
OSC
kHz
AMPLIFIERS
Input Offset Voltage V
OS
RL = 32Ω
2.4 mV
Input Bias Current I
BIAS
0nA
COM Bias Current I
COM
0nA
Equivalent Input Offset Current I
OS
IOS = (I
BIAS(INR)
+ I
BIAS(INL)
- I
COM
) / 2 ±2 nA
COM Input Range V
COM
Inferred from CMRR test
mV
Common-Mode Rejection Ratio CMRR -500mV ≤ V
COM
≤ +500mV, R
SOURCE
≤ 10Ω 75 96 dB
1.8V ≤ VDD ≤ 3.6V DC (Note 3) 75 86
76Power-Supply Rejection Ratio PSRR
V
DD
= 3.0V,
200mV
P-P
ripple (Note 4)
48
dB
RL = 32Ω 65
Output Power P
OUT
RL = 16Ω 55 80
mW
Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a 4-layer
board. For detailed information on package thermal considerations see www.maxim-ic.com/thermal-tutorial
.
SYMBOL
MIN TYP MAX
1.8
SV
DD
175
272 320 368
0.5
-700 -100
-1400 -200
-500 +500
THD+N = 1%, TA = +25°C
f
RIPPLE
f
RIPPLE
= 1kHz
= 20kHz
SV
DD
MAX4409
80mW, DirectDrive, Stereo Headphone
Amplifier with Common-Mode Sense
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(PVDD= SVDD= 3V, PGND = SGND = 0V, SHDN = SVDD, C1 = C2 = 2.2µF, RIN= RF= R1 = R2 = 10kΩ, RL= ∞, TA= T
MIN
to T
MAX
,
unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 2)
Note 2: All specifications are 100% tested at TA= +25°C; temperature limits are guaranteed by design. Note 3: Inputs are connected to ground and COM. Note 4: Inputs are AC-coupled to ground. COM is connected to ground.
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
RL = 32Ω, P
OUT
= 50mW
Total Harmonic Distortion Plus Noise
fIN = 1kHz
R
L
= 16Ω,
P
OUT
= 60mW
%
Signal-to-Noise Ratio (Note 4) SNR RL = 32Ω, P
OUT
= 20mW, fIN = 1kHz 95 dB
Slew Rate SR
V/µs
Maximum Capacitive Load C
L
No sustained oscillations
pF
Crosstalk RL = 16Ω, P
OUT
= 1.6mW, fIN = 10kHz 55 dB
Thermal Shutdown Threshold
°C
Thermal Shutdown Hysteresis 15 °C
ESD Protection Human Body Model (OUTR, OUTL) ±8 kV
Typical Operating Characteristics
(C1 = C2 = 2.2µF, R
IN
= RF= R1 = R2 = 10kΩ, THD+N measurement bandwidth = 22Hz to 22kHz, TA= +25°C, unless otherwise noted.)
10 100 10k1k 100k
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. FREQUENCY
MAX4409 toc01
FREQUENCY (Hz)
THD+N (%)
1
0.1
0.001
0.01
VDD = 3V R
L
= 16
Ω
P
OUT
= 10mW
P
OUT
= 60mW
1
0.001
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. FREQUENCY
0.01
0.1
MAX4409 toc02
THD+N (%)
10 100 10k1k 100k
FREQUENCY (Hz)
VDD = 3V R
L
= 32Ω
P
OUT
= 50mW
P
OUT
= 10mW
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. FREQUENCY
MAX4409 toc03
THD+N (%)
1
0.1
0.001
0.01
VDD = 1.8V R
L
= 16Ω
P
OUT
= 5mW
P
OUT
= 15mW
10 100 10k1k 100k
FREQUENCY (Hz)
0.002
THD+N
0.005
0.8
150
140
MAX4409
80mW, DirectDrive, Stereo Headphone Amplifier with Common-Mode Sense
4 _______________________________________________________________________________________
Typical Operating Characteristics (continued)
(C1 = C2 = 2.2µF, R
IN
= RF= R1 = R2 = 10kΩ, THD+N measurement bandwidth = 22Hz to 22kHz, TA= +25°C, unless otherwise noted.)
1
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. FREQUENCY
0.001
0.01
0.1
MAX4409 toc04
VDD = 1.8V R
L
= 32Ω
THD+N (%)
P
OUT
= 15mW
P
OUT
= 5mW
10 100 10k1k 100k
FREQUENCY (Hz)
100
10
1
0.1
0.01
0.001 090
120
150
30 60
180
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. OUTPUT POWER
MAX4409 toc05
OUTPUT POWER (W)
THD+N (%)
VDD = 3V f = 20Hz R
L
= 16Ω
OUTPUTS OUT OF PHASE
OUTPUTS IN PHASE
100
10
1
0.1
0.01
0.001 090
120
150
30 60
180
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. OUTPUT POWER
MAX4409 toc06
OUTPUT POWER (W)
THD+N (%)
VDD = 3V f = 1kHz R
L
= 16Ω
OUTPUTS IN PHASE
OUTPUTS OUT OF PHASE
100
10
1
0.1
0.01
0.001 09060
120 150
30 180
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. OUTPUT POWER
MAX4409 toc07
OUTPUT POWER (W)
THD+N (%)
VDD = 3V f = 10kHz R
L
= 16Ω
OUTPUTS IN PHASE
OUTPUTS OUT OF PHASE
100
10
1
0.1
0.01
0.001
0.0001 0
40
60
8020
120
100
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. OUTPUT POWER
MAX4409 toc08
OUTPUT POWER (W)
THD+N (%)
VDD = 3V f = 20Hz R
L
= 32Ω
OUTPUTS IN PHASE
OUTPUTS OUT OF PHASE
100
10
1
0.1
0.01
0.001 0
40 100
60
80
20 120
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. OUTPUT POWER
MAX4409 toc09
OUTPUT POWER (W)
THD+N (%)
VDD = 3V f = 1kHz R
L
= 32Ω
OUTPUTS IN PHASE
OUTPUTS OUT OF PHASE
100
10
1
0.1
0.01
0.001 0 40 100
8060
20 120
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. OUTPUT POWER
MAX4409 toc10
OUTPUT POWER (W)
THD+N (%)
VDD = 3V f = 10kHz R
L
= 32Ω
OUTPUTS IN PHASE
OUTPUTS OUT OF PHASE
100
10
1
0.1
0.01
0.001 02040503010 60
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. OUTPUT POWER
MAX4409 toc11
OUTPUT POWER (W)
THD+N (%)
VDD = 1.8V f = 20Hz R
L
= 16Ω
OUTPUTS IN PHASE
OUTPUTS OUT OF PHASE
100
10
1
0.1
0.01
0.001 02040503010 60
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. OUTPUT POWER
MAX4409 toc12
OUTPUT POWER (W)
VDD = 1.8V f = 1kHz R
L
= 16Ω
THD+N (%)
OUTPUTS IN PHASE
OUTPUTS OUT OF PHASE
MAX4409
80mW, DirectDrive, Stereo Headphone
Amplifier with Common-Mode Sense
_______________________________________________________________________________________ 5
100
10
1
0.1
0.01
0.001 02040503010 60
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. OUTPUT POWER
MAX4409 toc13
OUTPUT POWER (W)
VDD = 1.8V f = 10kHz R
L
= 16Ω
THD+N (%)
OUTPUTS IN PHASE
OUTPUTS OUT OF PHASE
100
10
1
0.1
0.01
0.001 03040
2010
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. OUTPUT POWER
MAX4409 toc14
OUTPUT POWER (W)
THD+N (%)
VDD = 1.8V f = 20Hz R
L
= 32Ω
OUTPUTS IN PHASE
OUTPUTS OUT OF PHASE
100
10
1
0.1
0.01
0.001 020403010
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. OUTPUT POWER
MAX4409 toc15
OUTPUT POWER (W)
THD+N (%)
VDD = 1.8V f = 1kHz R
L
= 32Ω
OUTPUTS IN PHASE
OUTPUTS OUT OF PHASE
100
10
1
0.1
0.01
0.001 0
20 30
40
10
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. OUTPUT POWER
MAX4409 toc16
OUTPUT POWER (W)
THD+N (%)
VDD = 1.8V f = 10kHz R
L
= 32Ω
OUTPUTS IN PHASE
OUTPUTS OUT OF PHASE
10 100 10k1k 100k
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
MAX4409 toc17
FREQUENCY (Hz)
PSRR (dB)
0
-30
-40
-20
-10
-90
-70
-80
-50
-60
VDD = 3V V
IN
= 200mV
P-P
RL = 16Ω
10 100 10k1k 100k
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
MAX4410 toc18
FREQUENCY (Hz)
PSRR (dB)
0
-40
-10
-20
-30
-90
-70
-80
-50
-60
VDD = 3V V
IN
= 200mV
P-P
RL = 16Ω
10 100 10k1k 100k
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
MAX4410 toc19
FREQUENCY (Hz)
PSRR (dB)
0
-40
-10
-20
-30
-90
-70
-80
-50
-60
VDD = 1.8V V
IN
= 200mV
P-P
RL = 16Ω
10 100 10k1k 100k
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
MAX4410 toc20
FREQUENCY (Hz)
PSRR (dB)
0
-40
-10
-20
-30
-90
-70
-80
-60
-50
VDD = 1.8V V
IN
= 200mV
P-P
RL = 32Ω
CROSSTALK vs. FREQUENCY
MAX4410 toc21
FREQUENCY (Hz)
CROSSTALK (dB)
10k1k100
-80
-60
-70
-40
-50
-10
-20
-30
0
-90 10 100k
LEFT TO RIGHT
RIGHT TO LEFT
VIN = 200mV
P-P
Typical Operating Characteristics (continued)
(C1 = C2 = 2.2µF, R
IN
= RF= R1 = R2 = 10kΩ, THD+N measurement bandwidth = 22Hz to 22kHz, TA= +25°C, unless otherwise noted.)
MAX4409
80mW, DirectDrive, Stereo Headphone Amplifier with Common-Mode Sense
6 _______________________________________________________________________________________
Typical Operating Characteristics (continued)
(C1 = C2 = 2.2µF, R
IN
= RF= R1 = R2 = 10kΩ, THD+N measurement bandwidth = 22Hz to 22kHz, TA= +25°C, unless otherwise noted.)
COMMON-MODE REJECTION RATIO
vs. FREQUENCY
MAX4409 toc22
FREQUENCY (Hz)
CMRR (dB)
10k1k100
-90
-70
-80
-40
-50
-60
-10
-20
-30
0
-100 10 100k
VIN = 500mV
P-P
OUTPUT POWER vs. SUPPLY VOLTAGE
MAX4409 toc23
SUPPLY VOLTAGE (V)
OUTPUT POWER (mW)
3.33.02.72.42.1
20
40
60
80
100
120
140
160
180
200
0
1.8 3.6
fIN = 1kHz R
L
= 16Ω
THD+N = 1%
INPUTS
IN PHASE
INPUTS 180°
OUT OF PHASE
OUTPUT POWER vs. SUPPLY VOLTAGE
MAX4409 toc24
SUPPLY VOLTAGE (V)
OUTPUT POWER (mW)
3.33.02.72.42.1
50
100
150
200
250
300
0
1.8 3.6
fIN = 1kHz R
L
= 16Ω
THD+N = 10%
INPUTS
IN PHASE
INPUTS 180°
OUT OF PHASE
OUTPUT POWER vs. SUPPLY VOLTAGE
MAX4409 toc25
SUPPLY VOLTAGE (V)
OUTPUT POWER (mW)
3.33.02.72.42.1
20
40
60
80
100
120
140
0
1.8 3.6
fIN = 1kHz R
L
= 32Ω
THD+N = 1%
INPUTS 180°
OUT OF PHASE
INPUTS
IN PHASE
OUTPUT POWER vs. SUPPLY VOLTAGE
MAX4409 toc26
SUPPLY VOLTAGE (V)
OUTPUT POWER (mW)
3.33.02.72.42.1
40
20
60
80
100
120
140
160
180
0
1.8 3.6
fIN = 1kHz R
L
= 32Ω
THD+N = 10%
INPUTS
IN PHASE
INPUTS 180°
OUT OF PHASE
OUTPUT POWER vs. LOAD RESISTANCE
MAX4409 toc27
LOAD RESISTANCE (Ω)
OUTPUT POWER (mW)
10k1k100
40
20
60
80
100
120
140
160
0
10 100k
VDD = 3V
f
IN
= 1kHz
THD+N = 1%
INPUTS 180°
OUT OF PHASE
INPUTS
IN PHASE
OUTPUT POWER vs. LOAD RESISTANCE
MAX4409 toc28
LOAD RESISTANCE (Ω)
OUTPUT POWER (mW)
10k1k100
50
100
150
200
250
0
10 100k
INPUTS
IN PHASE
INPUTS 180°
OUT OF PHASE
VDD = 3V
f
IN
= 1kHz
THD+N = 10%
OUTPUT POWER vs. LOAD RESISTANCE
MAX4409 toc29
LOAD RESISTANCE (Ω)
OUTPUT POWER (mW)
10k1k100
5
10
15
20
25
30
35
40
45
0
10 100k
INPUTS 180° OUT OF PHASE
INPUTS IN PHASE
VDD = 1.8V
f
IN
= 1kHz
THD+N = 1%
OUTPUT POWER vs. LOAD RESISTANCE
MAX4409 toc30
LOAD RESISTANCE (Ω)
OUTPUT POWER (mW)
10k1k100
10
20
30
40
50
60
70
0
10 100k
INPUTS 180° OUT OF PHASE
INPUTS IN PHASE
VDD = 1.8V
f
IN
= 1kHz
THD+N = 10%
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