MAX4410EUD-T [MAXIM]
Audio Amplifier, 0.08W, 2 Channel(s), 1 Func, BICMOS, PDSO14, 4.40 MM, TSSOP-14;
| 型号： | MAX4410EUD-T |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Audio Amplifier, 0.08W, 2 Channel(s), 1 Func, BICMOS, PDSO14, 4.40 MM, TSSOP-14 放大器 信息通信管理 光电二极管 商用集成电路 |
| 文件： | 总18页 (文件大小：592K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-2386; Rev 0; 4/02
80mW, DirectDrive Stereo Headphone Driver
with Shutdown
General Description
Features
The MAX4410 stereo headphone driver is designed for
portable equipment where board space is at a
premium. The MAX4410 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.
ꢀ No Bulky DC-Blocking Capacitors Required
ꢀ Ground-Referenced Outputs Eliminate DC-Bias
Voltages on Headphone Ground Pin
ꢀ No Degradation of Low-Frequency Response Due
to Output Capacitors
ꢀ 80mW Per Channel into 16Ω
The MAX4410 delivers up to 80mW per channel into a
16Ω load and has low 0.005% THD + N. A high power-
supply rejection ratio (90dB at 1kHz) allows this device
to operate from noisy digital supplies without an addi-
tional linear regulator, and includes 8kV ESD protection.
Comprehensive 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.
ꢀ Low 0.005% THD + N
ꢀ High PSRR (90dB at 1kHz)
ꢀ Integrated Click-and-Pop Suppression
ꢀ 1.8V to 3.6V Single-Supply Operation
ꢀ Low Quiescent Current
ꢀ Independent Left/Right, Low-Power
Shutdown Controls
ꢀ Short-Circuit and Thermal Overload Protection
The MAX4410 operates from a single 1.8V to 3.6V supply,
consumes only 7mA of supply current, has short-circuit
and thermal overload protection, and is specified over the
extended -40°C to +85°C temperature range. The
MAX4410 is available in a tiny (2mm x 2mm), 16-bump
ultra chip-scale package (UCSP™) and a 14-pin TSSOP
package.
ꢀ
8kV ESD-Protected Amplifier Outputs
ꢀ Available in Space-Saving Packages
16-Bump UCSP (2mm x 2mm)
14-Pin TSSOP
Ordering Information
PIN/BUMP-
PACKAGE
PART
TEMP RANGE
Applications
Notebooks
Cellular Phones
PDAs
MP3 Players
Web Pads
Portable Audio Equipment
MAX4410EBE-T*
MAX4410EUD
-40°C to +85°C
-40°C to +85°C
16 UCSP-16
14 TSSOP
*Future product—contact factory for availability.
Pin Configurations
TOP VIEW
(BUMP SIDE
DOWN)
MAX4410
TOP VIEW
1
2
3
4
A
B
SHDNL
PV
1
2
3
4
5
6
7
14 SGND
13 INR
INR
SGND
SHDNL
OUTR
PV
C1P
DD
DD
C1P
PGND
C1N
12 SHDNR
PGND
C1N
SHDNR
INL
11 OUTR
10 INL
MAX4410
C
D
PV
SV
9
8
SV
DD
SS
SS
OUTL
SV
DD
OUTL
SV
SS
PV
SS
TSSOP
UCSP (B16-2)
UCSP is a trademark of Maxim Integrated Products, Inc.
Functional Diagram/Typical Application Circuit appears 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, DirectDrive Stereo Headphone Driver
with Shutdown
ABSOLUTE MAXIMUM RATINGS
PGND to SGND .....................................................-0.3V to +0.3V
Continuous Power Dissipation (T = +70°C)
A
PV
to SV
SS
and SV
-0.3V to +0.3V
16-Bump UCSP (derate 15.2mW/°C above +70°C) ..1212mW
14-Pin TSSOP (derate 9.1mW/°C above +70°C) .........727mW
Junction Temperature......................................................+150°C
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range.............................-65°C to +150°C
Bump Temperature (soldering) (Note 1)
Infrared (15s) ...............................................................+220°C
Vapor Phase (60s) .......................................................+215°C
Lead Temperature (soldering, 10s) .................................+300°C
DD
DD .................................................................
PV to SV .........................................................-0.3V to +0.3V
SS
PV
to PGND or SGND.........................-0.3V to +4V
DD
DD
SS
PV and SV to PGND or SGND ..........................-4V to +0.3V
SS
IN_ to SGND..........................................................-0.3V to +0.3V
SHDN_ to SGND........................(SGND - 0.3V) to (SV
OUT_ to SGND .............................(SV - 0.3V) to (SV
C1P to PGND.............................(PGND - 0.3V) to (PV
+ 0.3V)
+0.3V)
+ 0.3V)
DD
DD
DD
SS
C1N to PGND.............................(PV - 0.3V) to (PGND + 0.3V)
SS
Output Short Circuit to GND or V ...........................Continuous
DD
Note 1: This device is constructed using a unique set of packaging techniques that impose a limit on the thermal profile the device
can be exposed to during board-level solder attach and rework. This limit permits only the use of the solder profiles recom-
mended in the industry-standard specification, JEDEC 020A, paragraph 7.6, Table 3 for IR/VPR and convection reflow.
Preheating is required. Hand or wave soldering is not allowed.
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
= SV
= 3V, PGND = SGND = 0, SHDNL = SHDNR = SV , C1 = C2 = 2.2µF, R = R = 10kΩ, R = ∞, T = T
to T
,
MAX
DD
DD
DD
IN
F
L
A
MIN
unless otherwise noted. Typical values are at T = +25°C.) (Note 2)
A
PARAMETER
SYMBOL
CONDITIONS
Guaranteed by PSRR test
MIN
TYP
MAX
UNITS
Supply Voltage Range
V
1.8
3.6
V
DD
One channel enabled
Two channels enabled
SHDNL = SHDNR = GND
4
7
6
Quiescent Supply Current
Shutdown Supply Current
I
mA
µA
DD
11.5
10
I
SHDN
0.7 x
V
V
IH
IL
SV
DD
SHDN_ Thresholds
V
0.3 x
SV
DD
SHDN_ Input Leakage Current
SHDN_ to Full Operation
CHARGE PUMP
-1
+1
µA
µs
t
f
175
320
0.5
SON
OSC
Oscillator Frequency
AMPLIFIERS
272
368
kHz
Input Offset Voltage
Input Bias Current
V
Input AC-coupled, R = 32Ω
2.4
mV
nA
OS
L
I
-100
75
+100
BIAS
1.8V ≤ V
≤ 3.6V
DC
90
90
55
65
80
DD
Power-Supply Rejection Ratio
Output Power
PSRR
dB
f
f
= 1kHz
RIPPLE
RIPPLE
200mV
ripple
P-P
= 20kHz
R = 32Ω
L
P
THD + N = 1%
mW
OUT
R = 16Ω
L
40
2
_______________________________________________________________________________________
80mW, DirectDrive Stereo Headphone Driver
with Shutdown
ELECTRICAL CHARACTERISTICS (continued)
(PV
= SV
= 3V, PGND = SGND = 0, SHDNL = SHDNR = SV , C1 = C2 = 2.2µF, R = R = 10kΩ, R = ∞, T = T
to T
,
DD
DD
DD
IN
F
L
A
MIN
MAX
unless otherwise noted. Typical values are at T = +25°C.) (Note 2)
A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
R = 32Ω,
L
0.003
P
= 25mW
OUT
Total Harmonic Distortion Plus
Noise
THD + N
f
= 1kHz
%
IN
R = 16Ω,
L
0.005
P
= 50mW
OUT
Signal-to-Noise Ratio
Slew Rate
SNR
SR
R = 32Ω, P
= 20mW, f = 1kHz
95
0.8
300
67
dB
V/µs
pF
L
OUT
IN
Maximum Capacitive Load
Crosstalk
C
No sustained oscillations
R = 16Ω, P = 1.6mW, f = 10kHz
L
dB
°C
L
OUT
IN
Thermal Shutdown Threshold
Thermal Shutdown Hysteresis
ESD Protection
140
15
°C
Human body model (OUTR, OUTL)
8
kV
Note 2: All specifications are 100% tested at T = +25°C; temperature limits are guaranteed by design.
A
Typical Operating Characteristics
(C1 = C2 = 2.2µF, THD + N measurement bandwidth = 22Hz to 22kHz, single-channel driven, T = +25°C, unless otherwise noted.)
A
TOTAL HARMONIC DISTORTION +
NOISE vs. FREQUENCY
TOTAL HARMONIC DISTORTION +
NOISE vs. FREQUENCY
TOTAL HARMONIC DISTORTION +
NOISE vs. FREQUENCY
MAX4410 toc01
MAX4410 toc02
1
0.1
1
0.1
1
V
A
= 3V
V
A
R
= 3V
DD
DD
V
= 3V
DD
= -1V/V
= -2V/V
= 16Ω
V
V
L
A
= -1V/V
= 32Ω
V
L
R
L
= 16Ω
R
0.1
P
= 5mW
OUT
0.01
0.001
P
= 25mW
OUT
P
= 10mW
OUT
P
= 25mW
OUT
P
= 10mW
OUT
P
= 50mW
P
= 10mW
OUT
OUT
0.01
0.001
0.01
0.001
P
= 25mW
OUT
P
= 50mW
OUT
0.0001
10
100
1k
FREQUENCY (Hz)
10k
100k
10
100
1k
10k
100k
10
100
1k
10k
100k
FREQUENCY (Hz)
FREQUENCY (Hz)
_______________________________________________________________________________________
3
80mW, DirectDrive Stereo Headphone Driver
with Shutdown
Typical Operating Characteristics (continued)
(C1 = C2 = 2.2µF, THD + N measurement bandwidth = 22Hz to 22kHz, single-channel driven, T = +25°C, unless otherwise noted.)
A
TOTAL HARMONIC DISTORTION +
NOISE vs. FREQUENCY
TOTAL HARMONIC DISTORTION +
NOISE vs. FREQUENCY
TOTAL HARMONIC DISTORTION +
NOISE vs. FREQUENCY
MAX4410 toc05
MAX4410 toc06
1
0.1
1
0.1
1
V
A
= 1.8V
V
= 1.8V
DD
V
A
= 3V
DD
DD
= -1V/V
A
= -2V/V
= 16Ω
= -2V/V
= 32Ω
V
V
L
V
L
R
= 16Ω
R
R
L
0.1
P
= 5mW
OUT
P
= 10mW
OUT
P = 5mW
OUT
0.01
P
= 5mW
OUT
P
= 10mW
OUT
P
= 10mW
OUT
0.01
0.001
0.01
0.001
0.001
P
= 25mW
OUT
P
= 20mW
OUT
P
= 20mW
OUT
0.0001
10
100
1k
FREQUENCY (Hz)
10k
100k
10
100
1k
10k
100k
10
100
1k
FREQUENCY (Hz)
10k
100k
FREQUENCY (Hz)
TOTAL HARMONIC DISTORTION +
NOISE vs. OUTPUT POWER
TOTAL HARMONIC DISTORTION +
NOISE vs. FREQUENCY
TOTAL HARMONIC DISTORTION +
NOISE vs. FREQUENCY
1
1
100
10
1
V
= 1.8V
V
= 3V
DD
V
= 1.8V
DD
DD
A
= -2V/V
A
= -1V/V
A
= -1V/V
V
V
L
IN
V
R
= 32Ω
R
f
= 16Ω
R
= 32Ω
L
L
0.1
0.1
= 20Hz
P
= 5mW
OUT
P
= 5mW
P
= 10mW
OUT
OUT
0.01
0.01
0.001
P
= 10mW
OUT
0.1
0.001
P
= 20mW
OUT
0.01
P
= 20mW
OUT
0.0001
0.001
0.0001
10
100
1k
FREQUENCY (Hz)
10k
100k
10
100
1k
10k
100k
0
50
100
150
200
FREQUENCY (Hz)
OUTPUT POWER (mW)
TOTAL HARMONIC DISTORTION +
NOISE vs. OUTPUT POWER
TOTAL HARMONIC DISTORTION +
NOISE vs. OUTPUT POWER
TOTAL HARMONIC DISTORTION +
NOISE vs. OUTPUT POWER
100
10
1
100
100
10
V
= 3V
DD
V
= 3V
DD
V
= 3V
DD
V
= 16Ω
L
= 10kHz
A
= -2V/V
A
= -1V/V
A
= -1V/V
V
V
R
f
= 16Ω
R
f
= 16Ω
R
L
10
1
L
= 20Hz
= 1kHz
f
IN
IN
IN
1
0.1
0.1
0.1
0.01
0.01
0.01
0.001
0.001
0.001
0
50
100
150
200
0
50
100
150
200
0
50
100
150
200
OUTPUT POWER (mW)
OUTPUT POWER (mW)
OUTPUT POWER (mW)
4
_______________________________________________________________________________________
80mW, DirectDrive Stereo Headphone Driver
with Shutdown
Typical Operating Characteristics (continued)
(C1 = C2 = 2.2µF, THD + N measurement bandwidth = 22Hz to 22kHz, single-channel driven, T = +25°C, unless otherwise noted.)
A
TOTAL HARMONIC DISTORTION +
NOISE vs. OUTPUT POWER
TOTAL HARMONIC DISTORTION +
NOISE vs. OUTPUT POWER
TOTAL HARMONIC DISTORTION +
NOISE vs. OUTPUT POWER
100
10
100
10
1
100
10
V
= 3V
DD
V
A
= 3V
V
A
= 3V
DD
DD
A
= -2V/V
= -1V/V
= 32Ω
= 20Hz
V
L
IN
= -2V/V
V
L
IN
V
L
IN
R
f
= 16Ω
R
R
= 16Ω
= 1kHz
f
f
= 10kHz
1
1
0.1
0.1
0.1
0.01
0.001
0.01
0.001
0.01
0.001
0
25
50
75
100
125
125
60
0
50
100
150
200
0
50
100
150
200
OUTPUT POWER (mW)
OUTPUT POWER (mW)
OUTPUT POWER (mW)
TOTAL HARMONIC DISTORTION +
NOISE vs. OUTPUT POWER
TOTAL HARMONIC DISTORTION +
NOISE vs. OUTPUT POWER
TOTAL HARMONIC DISTORTION +
NOISE vs. OUTPUT POWER
100
10
100
10
100
10
V
A
= 3V
DD
V
A
= 3V
V
= 3V
DD
DD
= -1V/V
= 32Ω
= 1kHz
V
L
IN
= -1V/V
A
= -2V/V
= 32Ω
= 20Hz
V
L
IN
V
L
R
R
= 32Ω
R
f
f
= 10kHz
f
IN
1
1
1
0.1
0.1
0.1
0.01
0.001
0.01
0.01
0.001
0.001
0
25
50
75
100
125
0
25
50
75
100
125
0
25
50
75
100
OUTPUT POWER (mW)
OUTPUT POWER (mW)
OUTPUT POWER (mW)
TOTAL HARMONIC DISTORTION +
NOISE vs. OUTPUT POWER
TOTAL HARMONIC DISTORTION +
NOISE vs. OUTPUT POWER
TOTAL HARMONIC DISTORTION +
NOISE vs. OUTPUT POWER
100
10
100
10
100
10
V
A
= 3V
V
= 1.8V
DD
V
A
= 3V
DD
DD
= -2V/V
A
= -1V/V
= 16Ω
= 20Hz
= -2V/V
= 32Ω
= 1kHz
V
L
IN
V
L
V
L
IN
R
= 32Ω
R
R
f
= 10kHz
f
f
IN
1
1
1
0.1
0.1
0.1
0.01
0.01
0.01
0.001
0.001
0.001
0
25
50
75
100
125
0
10
20
30
40
50
0
25
50
75
100
125
OUTPUT POWER (mW)
OUTPUT POWER (mW)
OUTPUT POWER (mW)
_______________________________________________________________________________________
5
80mW, DirectDrive Stereo Headphone Driver
with Shutdown
Typical Operating Characteristics (continued)
(C1 = C2 = 2.2µF, THD + N measurement bandwidth = 22Hz to 22kHz, single-channel driven, T = +25°C, unless otherwise noted.)
A
TOTAL HARMONIC DISTORTION +
NOISE vs. OUTPUT POWER
TOTAL HARMONIC DISTORTION +
NOISE vs. OUTPUT POWER
TOTAL HARMONIC DISTORTION +
NOISE vs. OUTPUT POWER
100
10
100
10
100
10
V
A
= 1.8V
V
= 1.8V
DD
V
A
R
f
= 1.8V
DD
DD
= -1V/V
= 16Ω
= 1kHz
A
= -2V/V
= 16Ω
= 20Hz
= -1V/V
= 16Ω
= 10kHz
V
L
IN
V
L
IN
V
L
IN
R
R
f
f
1
1
1
0.1
0.1
0.1
0.01
0.01
0.01
0.001
0.001
0.001
0
10
20
30
40
50
60
0
10
20
30
40
50
60
0
10
20
30
40
50
60
OUTPUT POWER (mW)
OUTPUT POWER (mW)
OUTPUT POWER (mW)
TOTAL HARMONIC DISTORTION +
NOISE vs. OUTPUT POWER
TOTAL HARMONIC DISTORTION +
NOISE vs. OUTPUT POWER
TOTAL HARMONIC DISTORTION +
NOISE vs. OUTPUT POWER
100
10
100
10
100
10
V
A
= 1.8V
V
A
R
f
= 1.8V
DD
V
A
R
f
= 1.8V
DD
DD
= -2V/V
= -2V/V
= 16Ω
= 1kHz
V
= -1V/V
= 32Ω
= 20Hz
V
L
IN
V
L
IN
R
= 16Ω
= 10kHz
L
f
IN
1
1
1
0.1
0.1
0.1
0.01
0.01
0.01
0.001
0.001
0.001
0
10
20
30
40
50
60
0
10
20
30
40
50
60
0
10
20
30
40
50
OUTPUT POWER (mW)
OUTPUT POWER (mW)
OUTPUT POWER (mW)
TOTAL HARMONIC DISTORTION +
NOISE vs. OUTPUT POWER
TOTAL HARMONIC DISTORTION +
NOISE vs. OUTPUT POWER
TOTAL HARMONIC DISTORTION +
NOISE vs. OUTPUT POWER
100
10
100
10
100
10
V
A
= 1.8V
V
= 1.8V
DD
V
A
R
f
= 1.8V
DD
DD
= -1V/V
= 32Ω
= 10kHz
A
R
f
= -2V/V
= -1V/V
= 32Ω
= 1kHz
V
L
IN
V
V
L
IN
R
= 32Ω
L
IN
f
= 20Hz
1
1
1
0.1
0.1
0.1
0.01
0.01
0.01
0.001
0.001
0.001
0
10
20
30
40
50
0
10
20
30
40
50
0
10
20
30
40
50
OUTPUT POWER (mW)
OUTPUT POWER (mW)
OUTPUT POWER (mW)
6
_______________________________________________________________________________________
80mW, DirectDrive Stereo Headphone Driver
with Shutdown
Typical Operating Characteristics (continued)
(C1 = C2 = 2.2µF, THD + N measurement bandwidth = 22Hz to 22kHz, single-channel driven, T = +25°C, unless otherwise noted.)
A
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
TOTAL HARMONIC DISTORTION +
NOISE vs. OUTPUT POWER
TOTAL HARMONIC DISTORTION +
NOISE vs. OUTPUT POWER
0
100
10
100
10
V
= 3V
DD
= 16Ω
V
A
= 1.8V
V
A
R
f
= 1.8V
DD
DD
R
L
= -2V/V
= -2V/V
= 32Ω
= 1kHz
V
V
L
IN
-20
R
= 32Ω
= 10kHz
L
f
IN
-40
-60
1
1
0.1
0.1
-80
0.01
0.01
-100
0.001
0.001
0.01
0.1
1
10
100
0
10
20
30
40
50
0
10
20
30
40
50
FREQUENCY (kHz)
OUTPUT POWER (mW)
OUTPUT POWER (mW)
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
0
0
0
V
R
= 3V
V
= 1.8V
V
= 1.8V
DD
DD
= 32Ω
DD
= 16Ω
R
L
R = 32Ω
L
L
-20
-40
-60
-20
-40
-60
-20
-40
-60
-80
-80
-80
-100
-100
-100
0.01
0.1
1
10
100
0.01
0.1
1
10
100
0.01
0.1
1
10
100
FREQUENCY (kHz)
FREQUENCY (kHz)
FREQUENCY (kHz)
CROSSTALK vs. FREQUENCY
OUTPUT POWER vs. SUPPLY VOLTAGE
OUTPUT POWER vs. SUPPLY VOLTAGE
0
-20
200
180
160
140
120
100
80
300
V
P
= 3V
f
= 1kHz
f
= 1kHz
IN
L
DD
IN
= 1.6mW
INPUTS 180°
OUT OF PHASE
R
L
= 16Ω
R
= 16Ω
OUT
250
200
150
100
50
INPUTS 180°
OUT OF PHASE
R = 16Ω
THD + N = 1%
THD + N = 10%
L
-40
-60
60
INPUTS
IN PHASE
INPUTS
IN PHASE
-80
40
20
-100
0
0
10
100
1k
10k
100k
1.8
2.1
2.4
2.7
3.0
3.3
3.6
1.8
2.1
2.4
2.7
3.0
3.3
3.6
FREQUENCY (Hz)
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
_______________________________________________________________________________________
7
80mW, DirectDrive Stereo Headphone Driver
with Shutdown
Typical Operating Characteristics (continued)
(C1 = C2 = 2.2µF, THD + N measurement bandwidth = 22Hz to 22kHz, single-channel driven, T = +25°C, unless otherwise noted.)
A
OUTPUT POWER vs. SUPPLY VOLTAGE
OUTPUT POWER vs. SUPPLY VOLTAGE
OUTPUT POWER vs. LOAD RESISTANCE
140
180
160
140
120
100
80
160
140
120
100
80
f
= 1kHz
f
= 1kHz
IN
L
V
f
= 3V
IN
DD
R
L
= 32Ω
R
= 32Ω
= 1kHz
120
100
IN
INPUTS 180°
THD + N = 10%
INPUTS 180°
OUT OF PHASE
THD + N = 1%
THD + N = 1%
OUT OF PHASE
80
60
40
20
0
INPUTS 180°
OUT OF PHASE
INPUTS
IN PHASE
60
60
40
20
0
INPUTS
IN PHASE
40
20
0
INPUTS
IN PHASE
1.8
2.1
2.4
2.7
3.0
3.3
3.6
1.8
2.1
2.4
2.7
3.0
3.3
3.6
10
100
1k
10k
100k
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
LOAD RESISTANCE (Ω)
OUTPUT POWER vs. LOAD RESISTANCE
OUTPUT POWER vs. LOAD RESISTANCE
OUTPUT POWER vs. LOAD RESISTANCE
70
60
50
40
30
20
10
0
45
40
35
30
25
20
15
10
5
250
200
150
V
f
= 1.8V
V
f
= 3V
DD
V
f
= 1.8V
DD
DD
= 1kHz
= 1kHz
IN
= 1kHz
IN
IN
INPUTS 180°
OUT OF PHASE
INPUTS 180°
OUT OF PHASE
THD + N = 10%
THD + N = 10%
THD + N = 1%
INPUTS IN
PHASE
INPUTS IN
PHASE
INPUTS 180°
OUT OF PHASE
100
50
0
INPUTS
IN PHASE
0
10
100
1k
10k
100k
10
100
1k
10k
100k
10
100
1k
10k
100k
LOAD RESISTANCE (Ω)
LOAD RESISTANCE (Ω)
LOAD RESISTANCE (Ω)
POWER DISSIPATION
vs. OUTPUT POWER
POWER DISSIPATION
vs. OUTPUT POWER
POWER DISSIPATION
vs. OUTPUT POWER
180
160
140
120
100
400
350
300
250
200
150
100
50
INPUTS
IN PHASE
INPUTS
IN PHASE
INPUTS
IN PHASE
f
= 1kHz
= 16Ω
= 1.8V
f
= 1kHz
= 16Ω
= 3V
IN
L
DD
OUT
IN
L
DD
OUT
R
V
R
V
140
120
100
80
P
= P
+ P
P
= P
+ P
OUTR
OUTL OUTR
OUTL
INPUTS 180°
OUT OF PHASE
INPUTS 180°
OUT OF PHASE
80
60
40
20
0
INPUTS 180°
OUT OF PHASE
60
40
20
0
f
= 1kHz
= 32Ω
IN
R
L
V
P
= 3V
DD
OUT
= P
+ P
OUTR
OUTL
0
0
40
80
120
160
200
0
10
20
30
40
50
60
0
40
80
120
160
200
OUTPUT POWER (mW)
OUTPUT POWER (mW)
OUTPUT POWER (mW)
8
_______________________________________________________________________________________
80mW, DirectDrive Stereo Headphone Driver
with Shutdown
Typical Operating Characteristics (continued)
(C1 = C2 = 2.2µF, THD + N measurement bandwidth = 22Hz to 22kHz, single-channel driven, T = +25°C, unless otherwise noted.)
A
POWER DISSIPATION
vs. OUTPUT POWER
GAIN AND PHASE vs. FREQUENCY
70
60
50
80
60
40
20
0
INPUTS
IN PHASE
INPUTS 180°
-20
-40
-60
-80
-100
-120
-140
-160
-180
40
30
20
10
0
OUT OF PHASE
f
= 1kHz
= 32Ω
= 1.8V
IN
L
DD
R
V
V
A
= 3V
DD
= 1000V/V
V
R
P
= P
+ P
OUT
OUTL OUTR
= 16Ω
L
0
10
20
30
40
50
60
100
10k
100k
1M
10M
1k
OUTPUT POWER (mW)
FREQUENCY (Hz)
CHARGE-PUMP OUTPUT RESISTANCE
vs. SUPPLY VOLTAGE
GAIN FLATNESS vs. FREQUENCY
10
10
V
PVSS
NO LOAD
= GND
IN_
0
-10
-20
I
= 10mA
8
6
4
2
0
-30
-40
-50
V
A
L
= 3V
DD
= -1V/V
V
R = 16Ω
100
10
1k
10k 100k 1M
10M
1.8
2.1
2.4
2.7
3.0
3.3
3.6
FREQUENCY (Hz)
SUPPLY VOLTAGE (V)
OUTPUT POWER vs. CHARGE-PUMP
CAPACITANCE AND LOAD RESISTANCE
OUTPUT SPECTRUM vs. FREQUENCY
90
80
70
60
50
0
-20
C1 = C2 = 2.2µF
C1 = C2 = 1µF
V
IN
R
A
= 1V
P-P
IN
f
= 1kHz
= 32Ω
= -1V/V
L
V
-40
C1 = C2 = 0.68µF
C1 = C2 = 0.47µF
-60
40
30
20
10
0
-80
f
= 1kHz
IN
-100
-120
THD + N = 1%
INPUTS IN PHASE
10
20
30
40
50
0.1
1
10
100
LOAD RESISTANCE (Ω)
FREQUENCY (kHz)
_______________________________________________________________________________________
9
80mW, DirectDrive Stereo Headphone Driver
with Shutdown
Typical Operating Characteristics (continued)
(C1 = C2 = 2.2µF, THD + N measurement bandwidth = 22Hz to 22kHz, single-channel driven, T = +25°C, unless otherwise noted.)
A
SHUTDOWN SUPPLY CURRENT
vs. SUPPLY VOLTAGE
SUPPLY CURRENT vs. SUPPLY VOLTAGE
10
10
SHDNL = SHDNR = GND
8
6
4
2
0
8
6
4
2
0
0
0.9
1.8
2.7
3.6
0
0.9
1.8
2.7
3.6
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
POWER-UP/DOWN WAVEFORM
EXITING SHUTDOWN
MAX4410 toc58
MAX4410 toc57
3V
0
2V/div
V
DD
SHDNR
OUTR
OUT_
10mV/div
20dB/div
-100dB
500mV/div
OUT_FFT
200ms/div
FFT: 25Hz/div
200µs/div
f
= 1kHz
IN
R = 32Ω
IN_
R = 32Ω
SHDNL = GND
L
L
V
= GND
10 ______________________________________________________________________________________
80mW, DirectDrive Stereo Headphone Driver
with Shutdown
Pin Description
PIN
BUMP
NAME
FUNCTION
TSSOP
UCSP
1
B2
SHDNL
Active-Low, Left-Channel Shutdown. Connect to V for normal operation.
DD
Charge-Pump Power Supply. Powers charge-pump inverter, charge-pump logic, and
oscillator.
2
A3
PV
DD
3
4
A4
B4
C4
D4
D3
D2
D1
C1
C2
B1
A1
A2
C1P
PGND
C1N
Flying Capacitor Positive Terminal
Power Ground. Connect to SGND.
Flying Capacitor Negative Terminal
Charge-Pump Output
5
6
PV
SS
SV
SS
7
Amplifier Negative Power Supply. Connect to PV
.
SS
8
OUTL
SV
Left-Channel Output
9
Amplifier Positive Power Supply. Connect to PV
.
DD
DD
10
11
12
13
14
INL
Left-Channel Audio Input
OUTR
SHDNR
INR
Right-Channel Output
Active-Low, Right-Channel Shutdown. Connect to V
Right-Channel Audio Input
for normal operation.
DD
SGND
Signal Ground. Connect to PGND.
______________________________________________________________________________________ 11
80mW, DirectDrive Stereo Headphone Driver
with Shutdown
Detailed Description
The MAX4410 stereo headphone driver features Maxim’s
V
DD
patented DirectDrive architecture, eliminating the large
output-coupling capacitors required by traditional single-
supply headphone drivers. The device consists of two
80mW Class AB headphone drivers, undervoltage lock-
out (UVLO)/shutdown control, charge-pump, and com-
prehensive click-and-pop suppression circuitry (see the
Functional Diagram/Typical Application Circuit). The
V
/2
V
DD
OUT
charge pump inverts the positive supply (PV ), creat-
DD
GND
ing a negative supply (PV ). The headphone drivers
SS
operate from these bipolar supplies with their outputs
biased about GND (Figure 1). The drivers have almost
twice the supply range compared to other 3V single-sup-
ply drivers, increasing the available output power. The
benefit of this GND bias is that the driver outputs do not
CONVENTIONAL DRIVER-BIASING SCHEME
+V
DD
have a DC component typically V /2. Thus, the large
DD
DC-blocking capacitors are unnecessary, improving fre-
quency response while conserving board space and
system cost.
V
OUT
GND
Each channel has independent left/right, active-low
shutdown controls, making it possible to optimize
power savings in mixed-mode, mono/stereo operation.
The device features an undervoltage lockout that pre-
vents operation from an insufficient power supply and
click-and-pop suppression that eliminates audible tran-
sients on startup and shutdown. Additionally, the
MAX4410 features thermal overload and short-circuit
protection and can withstand 8kV ESD strikes on the
output pins.
-V
DD
DirectDrive BIASING SCHEME
Figure 1. Traditional Driver Output Waveform vs. MAX4410
Output Waveform
DirectDrive
Traditional single-supply headphone drivers have their
outputs biased about a nominal DC voltage (typically
half the supply) for maximum dynamic range. Large
coupling capacitors are needed to block this DC bias
from the headphone. Without these capacitors, a signif-
icant amount of DC current flows to the headphone,
resulting in unnecessary power dissipation and possi-
ble damage to both headphone and headphone driver.
Operating Characteristics for details of the possible
capacitor sizes. There is a low DC voltage on the driver
outputs due to amplifier offset. However, the offset of
the MAX4410 is typically 0.5mV, which, when com-
bined with a 32Ω load, results in less than 16µA of DC
current flow to the headphones.
Previous attempts to eliminate the output-coupling capac-
itors involved biasing the headphone return (sleeve) to
the DC-bias voltage of the headphone amplifiers. This
method raises some issues:
Maxim’s patented DirectDrive architecture uses a
charge pump to create a negative supply voltage. This
allows the outputs of the MAX4410 to be biased about
GND, almost doubling dynamic range while operating
from a single supply. With no DC component, there is
no need for the large DC-blocking capacitors. Instead
of two large (220µF, typ) tantalum capacitors, the
MAX4410 charge pump requires two small ceramic
capacitors, conserving board space, reducing cost,
and improving the frequency response of the head-
phone driver. See the Output Power vs. Charge-Pump
Capacitance and Load Resistance graph in the Typical
1) The sleeve is typically grounded to the chassis.
Using this biasing approach, the sleeve must be
isolated from system ground, complicating product
design.
2) During an ESD strike, the driver’s ESD structures
are the only path to system ground. Thus, the driver
must be able to withstand the full ESD strike.
3) When using the headphone jack as a line out to other
12 ______________________________________________________________________________________
80mW, DirectDrive Stereo Headphone Driver
with Shutdown
equipment, the bias voltage on the sleeve may con-
Applications Information
flict with the ground potential from other equipment,
Power Dissipation
Under normal operating conditions, linear power ampli-
fiers can dissipate a significant amount of power. The
maximum power dissipation for each package is given
in the Absolute Maximum Ratings section under
Continuous Power Dissipation or can be calculated by
the following equation:
resulting in possible damage to the drivers.
Charge Pump
The MAX4410 features a low-noise charge pump. The
320kHz switching frequency is well beyond the audio
range, and thus does not interfere with the audio sig-
nals. The switch drivers feature a controlled switching
speed that minimizes noise generated by turn-on and
turn-off transients. By limiting the switching speed of the
switches, the di/dt noise caused by the parasitic bond
wire and trace inductance is minimized. Although not
typically required, additional high-frequency noise atten-
uation can be achieved by increasing the size of C2
(see the Functional Diagram/Typical Application Circuit).
T
− T
A
J(MAX)
P
=
DISSPKG(MAX)
θ
JA
where T
is +150°C, T is the ambient tempera-
A
J(MAX)
ture, and θ is the reciprocal of the derating factor in
JA
°C/W as specified in the Absolute Maximum Ratings
section. For example, θ
of the TSSOP package is
JA
+109.9°C/W.
Shutdown
The MAX4410 features two shutdown controls allowing
either channel to be shut down or muted independent-
ly. SHDNL controls the left channel while SHDNR con-
trols the right channel. Driving either SHDN_ low
disables the respective channel, sets the driver output
impedance to 1kΩ, and reduces the supply current.
When both SHDN_ inputs are driven low, the charge
pump is also disabled, further reducing supply current
draw to 6µA. The charge pump is enabled once either
SHDN_ input is driven high.
The MAX4410 has two sources of power dissipation,
the charge pump and the two drivers. If the power dis-
sipation for a given application exceeds the maximum
allowed for a given package, either reduce V
,
DD
increase load impedance, decrease the ambient tem-
perature, or add heat sinking to the device. Large out-
put, supply, and ground traces improve the maximum
power dissipation in the package.
Thermal overload protection limits total power dissipa-
tion in the MAX4410. When the junction temperature
exceeds +140°C, the thermal protection circuitry dis-
ables the amplifier output stage. The amplifiers are
enabled once the junction temperature cools by 15°C.
This results in a pulsing output under continuous ther-
mal overload conditions.
Click-and-Pop Suppression
In traditional single-supply audio drivers, the output-
coupling capacitor is a major contributor of audible
clicks and pops. Upon startup, the driver charges the
coupling capacitor to its bias voltage, typically half the
supply. Likewise, on shutdown the capacitor is dis-
charged to GND. This results in a DC shift across the
capacitor, which in turn, appears as an audible transient
at the speaker. Since the MAX4410 does not require
output-coupling capacitors, this does not arise.
Output Power
The device has been specified for the worst-case sce-
nario— when both inputs are in phase. Under this con-
dition, the drivers simultaneously draw current from the
charge pump, leading to a slight loss in headroom of
Additionally, the MAX4410 features extensive click-and-
pop suppression that eliminates any audible transient
sources internal to the device. The Power-Up/Down
Waveform in the Typical Operating Characteristics
shows that there are minimal spectral components in the
audible range at the output upon startup or shutdown.
V
. In typical stereo audio applications, the left and
SS
right signals have differences in both magnitude and
phase, subsequently leading to an increase in the max-
imum attainable output power. Figure 2 shows the two
extreme cases for in and out of phase. In reality, the
available power lies between these extremes.
In most applications, the output of the preamplifier dri-
ving the MAX4410 has a DC bias of typically half the
supply. At startup, the input-coupling capacitor is
charged to the preamplifier’s DC-bias voltage through
the R of the MAX4410, resulting in a DC shift across
F
the capacitor and an audible click/pop. Delaying the
rise of the MAX4410’s SHDN_ signals 4 to 5 time con-
stants (200ms to 300ms) relative to that of the preampli-
fier’s eliminates this click/pop.
______________________________________________________________________________________ 13
80mW, DirectDrive Stereo Headphone Driver
with Shutdown
Table 1. Suggested Capacitor Manufacturers
SUPPLIER
Taiyo Yuden
TDK
PHONE
FAX
WEBSITE
www.t-yuden.com
www.component.tdk.com
800-348-2496
847-803-6100
847-925-0899
847-390-4405
Note: Please indicate you are using the MAX4410 when contacting these component suppliers.
Input Filtering
The input capacitor (C ), in conjunction with R forms
IN
IN,
100
10
1
a highpass filter that removes the DC bias from an
incoming signal (see the Functional Diagram/Typical
Application Circuit). The AC-coupling capacitor allows
the amplifier to bias the signal to an optimum DC level.
Assuming zero-source impedance, the -3dB point of
the highpass filter is given by:
V
= 3V
DD
R = 16Ω
L
f
= 1kHz
IN
INPUTS
IN
PHASE
1
f
=
−3dB
2πR C
IN IN
0.1
INPUTS
180° OUT
OF PHASE
Choose R according to the Gain-Setting Resistors sec-
IN
tion. Choose the C such that f
lowest frequency of interest. Setting f
is well below the
-3dB
IN
0.01
too high affects
-3dB
0
25
50
75
100
125
150
the low-frequency response of the amplifier. Use capaci-
tors whose dielectrics have low-voltage coefficients,
such as tantalum or aluminum electrolytic. Capacitors
with high-voltage coefficients, such as ceramics, may
result in increased distortion at low frequencies.
OUTPUT POWER (mW)
Figure 2. Output Power vs. Supply Voltage with Inputs In/Out of
Phase
Other considerations when designing the input filter
include the constraints of the overall system and the
actual frequency band of interest. Although high-fidelity
audio calls for a flat-gain response between 20Hz and
20kHz, portable voice-reproduction devices such as
cellular phones and two-way radios need only concen-
trate on the frequency range of the spoken human voice
(typically 300Hz to 3.5kHz). In addition, speakers used
in portable devices typically have a poor response
below 150Hz. Taking these two factors into considera-
tion, the input filter may not need to be designed for a
20Hz to 20kHz response, saving both board space and
cost due to the use of smaller capacitors.
Component Selection
Gain-Setting Resistors
External feedback components set the gain of the
MAX4410. Resistors R and R (see the Functional
F
IN
Diagram/Typical Application Circuit) set the gain of each
amplifier as follows:
R
F
A
= −
V
R
IN
To minimize V , set R equal to 10kΩ. Values other
OS
F
OS
than 10kΩ increase V
due to the input bias current,
which in turn increases the amount of DC current flow
to the speaker.
Charge-Pump Capacitor Selection
Use capacitors with an ESR less than 100mΩ for opti-
mum performance. Low-ESR ceramic capacitors mini-
mize the output resistance of the charge pump. For best
performance over the extended temperature range,
select capacitors with an X7R dielectric. Table 1 lists sug-
gested manufacturers.
Compensation Capacitor
The stability of the MAX4410 is affected by the value of
the feedback resistor (R ). The combination of R and
F
F
the input and parasitic trace capacitance introduces an
additional pole. Adding a capacitor in parallel with R
F
compensates for this pole. Under typical conditions
with proper layout, the device is stable without the
additional capacitor.
Flying Capacitor (C1)
The value of the flying capacitor (C1) affects the load
regulation and output resistance of the charge pump. A
C1 value that is too small degrades the device’s ability
to provide sufficient current drive, which leads to a loss
14 ______________________________________________________________________________________
80mW, DirectDrive Stereo Headphone Driver
with Shutdown
R
F
5
6
H0
L0
LEFT AUDIO
INPUT
C
IN
R
IN
10
W0A
7
8
INL
OUTL
MAX4410
MAX5408
RIGHT AUDIO
INPUT
H1
L1
12
C
IN
R
IN
13
11
10
W1A
INR
OUTR
11
R
F
Figure 3. MAX4410 and MAX5408 Volume Control Circuit
of output voltage. Increasing the value of C1 improves
load regulation and reduces the charge-pump output
resistance to an extent. See the Output Power vs.
Charge-Pump Capacitance and Load Resistance
graph in the Typical Operating Characteristics. Above
2.2µF, the on-resistance of the switches and the ESR of
C1 and C2 dominate.
MAX5408 to the audio input, the low terminal to ground
and the wiper to C . Setting the wiper to the top posi-
IN
tion passes the audio signal unattenuated. Setting the
wiper to the lowest position fully attenuates the input.
Layout and Grounding
Proper layout and grounding are essential for optimum
performance. Connect PGND and SGND together at a
single point on the PC board. Connect all components
associated with the charge pump (C2 and C3) to the
Output Capacitor (C2)
The output capacitor value and ESR directly affect the
PGND plane. Connect PV
and SV
SS
together at the
DD
ripple at PV . Increasing the value of C2 reduces out-
SS
DD
device. Connect PV and SV together at the device.
put ripple. Likewise, decreasing the ESR of C2 reduces
both ripple and output resistance. Lower capacitance
values can be used in systems with low maximum out-
put power levels. See the Output Power vs. Charge-
Pump Capacitance and Load Resistance graph in the
Typical Operating Characteristics.
SS
Bypassing of both supplies is accomplished by
charge-pump capacitors C2 and C3 (see Functional
Diagram/Typical Application Circuit). Place capacitors
C2 and C3 as close to the device as possible. Route
PGND and all traces that carry switching transients
away from SGND and the traces and components in
the audio signal path. Refer to the layout example in the
MAX4410 EV kit data sheet.
Power-Supply Bypass Capacitor
The power-supply bypass capacitor (C3) lowers the out-
put impedance of the power supply, and reduces the
impact of the MAX4410’s charge-pump switching tran-
When using the MAX4410 in a UCSP package, make
sure the traces to OUTR (bump C2) are wide enough to
handle the maximum expected current flow. Multiple
traces may be necessary.
sients. Bypass PV
with C3, the same value as C1, and
DD
place it physically close to the PV
and PGND pins
DD
(refer to the MAX4410 EV kit for a suggested layout).
UCSP Considerations
For general UCSP information and PC layout considera-
tions, refer to the Maxim Application Note: Wafer-Level
Ultra Chip-Scale Package.
Adding Volume Control
The addition of a digital potentiometer provides simple
volume control. Figure 3 shows the MAX4410 with the
MAX5408 dual log taper digital potentiometer used as
an input attenuator. Connect the high terminal of the
______________________________________________________________________________________ 15
80mW, DirectDrive Stereo Headphone Driver
with Shutdown
Functional Diagram/Typical Application Circuit
C
IN
1µF
R
R
F
IN
10kΩ
1.8V to 3.6V
10kΩ
LEFT
CHANNEL
AUDIO IN
C3
2.2µF
9
(D1)
1
(B2)
12
(B1)
10
(C1)
2
(A3)
INL
PV
SV
DD
DD
SHDNL
SHDNR
SV
DD
8
(D2)
OUTL
SGND
HEADPHONE
JACK
UVLO/
SHUTDOWN
CONTROL
3
(A4)
C1P
SV
SS
CHARGE
PUMP
CLICK-AND-POP
SUPPRESSION
C1
2.2µF
5
(C4) C1N
SV
DD
SGND
11
(C2)
MAX4410
OUTR
SV
SS
PV
SV
7
SS
6
PGND
4
SGND
INR
SS
14
(A2)
13
(A1)
(D4)
C2
2.2µF
(D3) (B4)
C
IN
1µF
R
F
10kΩ
R
IN
10kΩ
RIGHT
CHANNEL
AUDIO IN
( ) DENOTE BUMPS FOR UCSP.
Chip Information
TRANSISTOR COUNT: 4337
PROCESS: BiCMOS
16 ______________________________________________________________________________________
80mW, DirectDrive Stereo Headphone Driver
with Shutdown
Package Information
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,
go to www.maxim-ic.com/packages.)
______________________________________________________________________________________ 17
80mW, DirectDrive Stereo Headphone Driver
with Shutdown
Package Information (continued)
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,
go to www.maxim-ic.com/packages.)
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
18 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 2002 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
相关型号：
MAX4411BETP+T
Audio Amplifier, 0.08W, 2 Channel(s), 1 Func, BICMOS, 4 X 4 MM, 0.80 MM HEIGHT, QFN-20
MAXIM
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