Audio Product Guide

Transkript

Audio Product Guide

13th Edition
Audio
Product Guide
www.maximintegrated.com
Audio Product Guide
Table of Contents
Speaker Amplifiers
3
Digital Input Class D Amplifiers
4
Tiny Speaker Amplifier Solution
5
Boosted Class D and Class DG Amplifiers
6
High-Power Speaker Amplifiers
Headphone Amplifiers
82VRMS DirectDrive Amplifier
9
Class H Headphone Amplifiers
Codecs
10
Codec Design Tools
11
Audio Codec with FlexSound Processor
12
Selection Guide
17
2
Class A–Class H Amplifier Tutorial
Audio Product Guide
Plug-and-Play Digital Input Class D Amplifiers
The MAX98355A/MAX98355B and the MAX98356 are easy-to-use digital speaker amplifiers that improve audio quality,
simplify design, and hasten time to market. They offer very high wideband jitter tolerance, low THD+N, and low output offset
voltage to deliver superior performance and audio quality.
These devices are easy to use because unique internal circuitry allows the parts to self-configure for sample rate and bit depth.
This functionality eliminates the need for programming. The MAX98355A/MAX98355B and the MAX98356 do not require an
MCLK signal, simplifying routing and allowing for a small 9-bump package. They also do not require a separate digital supply rail,
thereby eliminating the need for an additional capacitor.
MAX98355A/MAX98355B
• Single-supply operation (2.5V to 5.5V)
• 3.2W output power into 4Ω at 5V
• 2.2mA quiescent current
SHUTDOWN
AND
CHANNEL
SELECT
• 92% efficiency (RL = 8Ω, POUT = 900mW, VDD = 3.7V)
• 25µVRMS output noise (AV = 15dB)
MAX98355A
MAX98355B
GAIN
CONTROL
• Low 0.013% THD+N at 1kHz
• No MCLK required
• Supports left, right, or (left + right)/2 outputs
PCM
INPUT
CLASS D
OUTPUT
STAGE
DIGITAL
AUDIO
INTERFACE
DAC
SHUTDOWN
AND
CHANNEL
SELECT
MAX98356
GAIN
CONTROL
DIGITAL
AUDIO
INTERFACE
DAC
CLASS D
OUTPUT
STAGE
MAX98356
• Single-supply operation (2.5V to 5.5V)
• 3.2W output power into 4Ω at 5V
• 1.7mA quiescent current
• 92% efficiency (RL = 8Ω, POUT = 900mW, VDD = 3.7V)
• 29µVRMS output noise (AV = 6dB)
• Low 0.013% THD+N at 1kHz
• Supports PDM_CLK rates of 1.8MHz to 4.32MHz
and 5.28MHz to 8.6MHz
• Supports left, right, or (left + right)/2 outputs
PDM
INPUT
3
Audio Product Guide
Tiny Speaker Amplifiers for Space-Constrained
Applications
Small Size to Fit Your Application
Maxim continues to lead the industry in innovative packaging technology that enables the smallest audio solutions. The
Maxim family includes the industry's smallest Class AB and D amplifiers on the market in tiny 0.3mm pitch, 1mm x 1mm,
9-bump WLP packages.
3DMI Process Technology
3DMI process technology enables us to stack passive components directly onto the active substrate without increasing package
height and area. This technology is used to integrate highly linear, input capacitors into the MAX98314, further reducing solution
size, to save at least 25% more board space and provide excellent THD+N, PSRR, and CMRR performance at low frequencies.
3DMI technology opens doors to countless possibilities for future solutions.
MAX98314
• 0.95mA at 3.7V low quiescent current
• 3.2W into 4Ω, VPVDD = 5V
• 19µV ultra-low noise
• Spread spectrum and active emissions limiting
Amplifier Class
Power at 10% THD+N (W),
RL = 4Ω
MAX98304
Class D
3.2
1x1
MAX98309
Class AB
2.7
1x1
MAX98310
Class AB
1.4
MAX98314
Class D
2.7
Part
MAX98314
CIN
CLASS D
MODULATOR
AND H-BRIDGE
UM
9-B P
m
1
GAIN CONTROL
4
Package (mm x mm)
1x1
✓
m x 1m
m
CIN
Integrated Input Capacitors
1x1
Audio Product Guide
Louder, Clearer Audio with Extended Battery Life
The MAX98500/MAX98502 boosted Class D amplifiers and the MAX98307/MAX98308 Class DG amplifiers are designed for
battery-operated portable devices.
MAX98500/MAX98502
• Integrated boost converter to provide a constant output power for louder audio output over a wide range of battery supply voltages.
• The automatic level control (ALC) has a battery tracking function that reduces output swing as the supply voltage drops,
preventing collapse of the battery voltage.
BATTERY
VBAT
B4
BOOST CONVERTER
SDBST D4
SDSPK C3
GAIN B2
RKNEE
LX
A3
A2
VCCOUT
MAX98500
CONTROL
A1 PVDD
B3
INP D2
INN D3
DIFFERENTIAL
INPUT
C4
AGND
GAIN
A4
BSTPGND
OUTPUT
STAGE
B1 SPKP
C1 SPKN
D1, C2
SPKPGND
MAX98307/MAX98308
• Class DG multilevel architecture offers highly efficient, high-power audio portable solutions.
• Class DG multilevel architecture combines Class D switching output efficiency and Class G supply level shifting to more
efficiently supply the required signal power. This allows for optimal efficiency over a wide output range. See the Class A–
Class H Amplifier Tutorial.
A Class DG amplifier improves upon Class AB by using a
different power supply voltage depending on the signal level.
Two or more voltages can be used, but all the voltages are
available all the time. This is done by generating additional
voltages from the single input voltage.
Multiple Power Supply Voltages
5
Audio Product Guide
No EMI Problems with Maxim's Class D
Amplifiers
Filterless Class D Amplifiers Provide the Output Power You Need With
No EMI Hassles
Maxim’s Class D amplifiers use patented spread-spectrum modulation techniques in conjunction with sophisticated edge-rate
control technology to minimize EMI emissions. With no need for LC filters to clean up RF interference, your design will be
compact, deliver solid performance, and cost less.
INL-
INL+
CLIPPING
LIMITER
CLASS D
MODULATOR
AND H-BRIDGE
PGA
MAX98400A
MAX98400B
MONO
MAX98400A/MAX98400B
• Wide 8V to 28V single-supply voltage range
INR-
INR+
OUTL+
Differential Input, Power Limiting,
Thermal Foldback, Excellent EMI
Performance, and Clipping Limiter
OUTL-
OUTRCLIPPING
LIMITER
PGA
CLASS D
MODULATOR
AND H-BRIDGE
OUTR+
• 2x20W into 8Ω or 1x40W into 4Ω (MAX98400A) or
2x12W into 8Ω (MAX98400B)
• Optional 5V supply for efficiency optimization
• Integrated edge rate control for low EMI for filterless
operation
• Clipping and power limiting
• Two-pin, eight gain selector (9.1dB to 32.9dB)
BIAS
CLASS D
AUDIO
INPUT
20W Stereo/10W Mono Amplifier
with I2C Volume Control
CLASS D
• Thermal foldback avoids thermal shutdown
MAX9744/MAX9768
VOLUME
CONTROL
AUDIO
INPUT
MUTE
• 4.5V to 14V supply voltage range
• Filterless, low-EMI modulation scheme
SHUTDOWN
ANALOG OR
I2C VOLUME
CONTROL
SYNC
6
• I2C or analog volume control
MAX9744
OSCILLATOR
SYNCOUT
• High efficiency eliminates bulky heatsinks
• High PSRR, low THD+N
Audio Product Guide
Maxim’s Class D Amplifier Family
Extend Battery Life While Reducing EMI, Clipping, Noise, and Clicks and Pops
Industry’s Lowest Supply Current
Supply Current vs. Supply Voltage
4.0
The MAX98300 and the MAX98302 represent a
substantial advancement in Class D amplifier power
consumption by achieving supply current as low as
600µA. Critical to maximizing battery life in today’s
portable products, this low supply current has been
achieved without sacrificing EMI suppression, clipping
behavior, noise performance, and click-and-pop level.
In fact, these have all been improved.
SUPPLY CURRENT (mA)
3.5
COMPETITION
3.0
2.5
2.0
1.5
MAX98300
1.0
0.5
0
Overdrive is No Problem—These
Amplifiers Clip Cleanly
In small consumer devices, both speakers and amplifiers
are driven hard to yield the highest sound pressure level
(SPL) possible. As a result, the amplifier may be heavily
clipped. Many amplifier designs, particularly Class D
designs, contribute additional high-frequency distortion
artifacts that are far more objectionable than a cleanly
clipped signal. The MAX98300 and the MAX98302
have been carefully designed to ensure clean recovery
from clipping events.
2.5
3.0
3.5
4.0
4.5
5.0
SUPPLY VOLTAGE (V)
5.5
MAX98300 Heavy Clipping Recovery
Low VOS for Low Click-and-Pop
Noise
Click-and-pop performance becomes important as
we aggressively manage the power of amplifiers with
frequent turn-on and turn-off cycles. If a pop or click
is heard each time, it is annoying for the user. The
MAX98300 has a very low offset voltage, and carefully
addresses other sources of click-and-pop noise to ensure
the best performance
MAX98300 Filtered Output Voltage vs. SHDN
VOUT
1mV (typ)
SHDN
MAX98300 EMI Spectrum (~24in Cable)
50.0
AMPLITUDE (dBμV/m)
40.0
EN55022B LIMIT
30.0
20.0
10.0
MAX98300
0.0
-10.0
30.0 100.0
200.0
300.0
400.0
500.0
600.0
700.0
800.0
900.0
1000.0
FREQUENCY (MHz)
7
Audio Product Guide
2VRMS DirectDrive Headphone Amplifier
The MAX97220A-MAX97220E deliver excellent audio quality and performance.
• Differential input reduces common input and ground noise
• Output power 125mW into 32Ω with a 5V supply
• 3VRMS output drive into 1kΩ with a 5V supply
• 2VRMS output drive into 600Ω with a 3.3V supply
• Fixed or externally adjustable gain with no clicks or pops
• Wide 2.5V to 5.5V operating range
• DirectDrive® outputs eliminate DC-blocking capacitors
• High 112dB SNR and 90dB THD+N across audio bandwidth
• Ground sense reduces noise, distortion, and crosstalk
RF
RIN
LEFT
AUDIO
INPUT
INLOUTL
RIN
INL+
RF
RIN
RIGHT
AUDIO
INPUT
INL-
OUTL
RIN
RF
MAX97220A
MAX97220B
MAX97220E
RF
INR+
INR+
OUTR
RIN
LEFT
AUDIO
INPUT INL+
INR-
RF
RIN
RIGHT
AUDIO
INPUT
RIN
MAX97220C
MAX97220D
RF
SGND
SGND
OUTR
INR-
RIN
RF
RF
8
Audio Product Guide
Ultra-Low Power Headphone Amplifiers
Low-Power Class H Headphone Amplifiers Offer Higher Efficiency
Class H amplifiers provide nearly 2x higher efficiency than the closest competitive Class G headphone amplifiers. Class H amps
modulate the supply voltage to minimize voltage drop across the output devices by using either multiple supply voltages or an
infinitely adjustable power supply.
Enjoy Longer Battery Life Using Second-Generation, Dual-Mode, DirectDrive
Technology
Based on Maxim’s proprietary DirectDrive technology, our dual-mode DirectDrive II Class H amplifiers save power by switching
between two supply voltages. The dual-mode charge pump uses ±0.9V rails when the output signal is small, only switching to
±1.8V supply voltage when more output power is needed. This technology renders a continuous signal without the glitches seen
in Class G amplifiers.
OUTPUT
VOLTAGE
+1.8V
+0.9V
32ms
HPVDD
VTH_H
TIME
VTH_L
-0.9V
HPVSS
32ms
-1.8V
No clicks
or pops
MAX97200
LEFT AUDIO INPUT
AUDIO
SOURCE
LEFT AUDIO OUTPUT
SHDN
RIGHT AUDIO INPUT
RIGHT AUDIO OUTPUT
0.05% THD+N
performance
CHARGE
PUMP
Dynamic,
Class H dual-mode
charge pump
9
Audio Product Guide
Customized Audio Made Easy
MAX98089, MAX98090*, and MAX98091* Codec Design Tool
Maxim’s evaluation kit and intuitive user interface allow you to tune flexible, feature-rich codecs to the desired performance
quickly and easily. Optimize parametric EQ, automatic level control, speaker excursion limiter, speaker distortion THD limiter,
microphone AGC, and microphone noise gate.
1) Download the codec GUI software.
2) Plug evaluation kit into your laptop.
3) Connect your headphones and speakers to the evaluation kit.
4) Graphically route and tune audio as you listen; register is set automatically.
Software drivers are available for Linux and other OS platforms.
*Future product—contact factory for availability.
10
Audio Product Guide
Audio Codecs with Integrated Digital Signal
Processing
The MAX98089 and the MAX98090* full-featured audio codecs improve audio performance and prevent speaker damage. The parts
feature Maxim’s proprietary FlexSound™ audio technology that optimizes the signal level and frequency response while limiting the
maximum distortion and power at the output. This technology improves loudspeaker performance and prevents speaker damage.
DIGITAL
MICROPHONE
DIGITAL AUDIO
INTERFACE
CONTROL
REGISTERS
4
5
6
OR
•
MICROPHONE 2
PREAMP/PGA
(DIFFERENTIAL)
3
ANALOG LINE INPUT
MICROPHONE
POWER
MANAGEMENT
MICROPHONE 1
PREAMP/PGA
(DIFFERENTIAL)
ANALOG LINE INPUT
MICROPHONE
OR
I2C
1
2
OR
ANALOG LINE INPUT
MICROPHONE
I2S/TDM
STEREO DIGITAL
MICOPHONE
OR
OR
BATTERY 1.8V 1.2V
•
STEREO
ADC
LINE INPUT A PGA
(DIFFERENTIAL OR
SINGLE-ENDED)
•
•
•
FlexSound DSP
DIGITAL BIQUAD FILTER
(RECORD)
7-BAND PARAMETRIC
EQUALIZER (PLAYBACK)
DYNAMIC RANGE CONTROL
(PLAYBACK)
DIGITAL FILTERING
DIGITAL GAIN/LEVEL
CONTROL
JACK DETECTION
MAX98090*
3-POLE (TRS) 4-POLE (TRRS)
Parametric EQ
MAX98089
MAX98090*/
MAX98091*
5 band
7 band
Distortion limiter
Yes
Yes
Excursion limiter
Yes
Yes
Integrated speaker amplifiers
Yes
Yes
Integrated headphone amplifiers
Yes
Yes
2
3/3
Digital microphone inputs
2
2/4
Line inputs/line outputs
4
6
Analog microphone inputs
Jack detection
LINE OUTPUT
OR
RECEIVER/
EARPIECE
SPEAKER LEFT
CLASS D AMPLIFIER
(DIFFERENTIAL)
SPEAKER RIGHT
CLASS D AMPLIFIER
(DIFFERENTIAL)
SPEAKER
LEFT/RIGHT
STEREO HEADPHONE
CLASS H AMPLIFIER
(SINGLE-ENDED)
LINE INPUT B PGA
(DIFFERENTIAL OR
SINGLE-ENDED)
Feature
STEREO
DAC
STEREO LINE OUTPUT
CLASS AB AMPLIFIER
(SINGLE-ENDED)
OR
SPEAKER LEFT
CLASS D AMPLIFIER
(DIFFERENTIAL)
Yes
Yes
Digital audio interfaces
2
1
Automatic level control
Yes
Yes
Power limiter
Yes
Yes
Microphone AGC
Yes
No
Microphone noise gate
Yes
No
CHARGE PUMP
HEADPHONES
OR
HEADSET
11
Audio Product Guide
Class AB Speaker Amplifiers
Part
Supply
Voltage
(V)
Output Power at
1% THD+N (W)
Features
8Ω
4Ω
Gain
Other
Package
(mm x mm)
MAX9710
4.5 to 5.5
2 x 1.5
2 x 2.6
Adj
Mute
20-TQFN (5 x 5)
MAX9711
4.5 to 5.5
1.5
2.6
Adj
Mute
12-TQFN (4 x 4)
1.1
1.4
Adj
Fixed
Headphone sense
8-TDFN (3 x 3),
9-UCSP™ (1.5 x 1.5)
1.1
1.4
2 x 1.1
2 x 1.4
Adj
Fixed
Differential inputs
10-TDFN (3 x 3),
9-UCSP (1.5 x 1.5)
MAX9716
MAX9717
MAX9718
MAX9719
2.7 to 5.5
2.7 to 5.5
MAX9730
2.7 to 5.5
2.4
—
Adj
Charge-pump-boosted amp for dynamic speakers
28-TQFN (4 x 4),
20-WLP (2 x 2.5)
MAX9738
2.7 to 5.5
16VP-P
—
Adj
DC-DC-boosted amp for ceramic speakers
20-WLP (2 x 2.5)
MAX9788
2.7 to 5.5
20VP-P
—
Adj
Charge-pump-boosted amp for ceramic speakers
28-TQFN (4 x 4),
20-WLP (2 x 2.5)
2.2 to 5.5
1.4
2.1
Differential inputs
9-WLP (1 x 1)
MAX98309
MAX98310
Adj
Fixed
High-Power, Class D Speaker Amplifiers
Part
Supply Voltage
(V)
Output Power
at 10% THD+N (W)
Features
8Ω
4Ω
Gain
Other
Package
(mm x mm)
MAX9708
10 to 18
2 x 20
40
Pin programmable
Programmable thermal flag
56-TQFN (8 x 8)
MAX9709
10 to 22
2 x 25
50
Pin programmable
Programmable thermal flag
56-TQFN (8 x 8)
MAX9736A
8 to 28
2 x 15
30
Set by external resistors
Mute function
32-TQFN (7 x 7)
MAX9736B
8 to 28
2x6
12
Mute function
32-TQFN (7 x 7)
MAX9737
8 to 28
7.4
14
Mute function
24-TQFN (4 x 4)
MAX9742
20 to 40
2 x 20
2 x 16
Single-ended output
36-TQFN (6 x 6)
MAX9744
MAX9768
4.5 to 14
2 x 13
2 x 20
I2C/analog
volume control
44-TQFN (7 x 7)
I2C/analog
volume control
24-TQFN (4 x 4)
4.5 to 14
10
—
MAX98400A*
8 to 28
2 x 20
40
Pin programmable
Clipping limiter
36-TQFN (6 x 6)
MAX98400B*
8 to 28
2 x 12
—
Pin programmable
Clipping limiter
24-TQFN (4 x 4)
*JEITA (Japan Electronics and Information Technology Industries Association) standard, “A Guide to the Safe Use of Secondary Lithium Ion Batteries in Notebook-type Personal Computers”, April 20, 2007.
12
Audio Product Guide
Low-Power, Class D Speaker Amplifiers
(Filterless)
Output Power at
1% THD+N (W)
Part
Supply Voltage
(V)
Features
8Ω
4Ω
SpreadSpectrum/
Edge-Rate
Control
Gain
Package
(mm x mm)
Differential
Input
MAX9715
4.5 to 5.5
2 x 1.4
2 x 2.3
✓/—
Pin programmable
16-TQFN (5 x 5)
MAX9759
3.0 to 5.5
1.4
2.6
✓/—
Pin programmable
✓
16-TQFN (4 x 4)
MAX9830
2.6 to 5.5
1.3
1.7
✓/✓
Fixed
✓
8-TDFN (2 x 2), 9-WLP (1.2 x 1.2)
MAX98300
2.6 to 5.5
1.3
2.1
✓/✓
Pin programmable
✓
8-TDFN (2 x 2), 9-WLP (1.2 x 1.2)
MAX98302
2.6 to 5.5
2x1
2x2
✓/✓
Pin programmable
✓
14-TDFN (3 x 3)
MAX98304
2.6 to 5.5
1.4
2.6
✓/✓
Pin programmable
✓
9-WLP (1.0 x 1.0)
MAX98306
2.6 to 5.5
2 x 1.4
2 x 2.4
✓/✓
Pin programmable
✓
14-TDFN (3 x 3)
MAX98314
2.6 to 5.5
1.4
2.6
✓/✓
Pin programmable
✓
9-WLP (1.0 x 1.0)
MAX98500
2.5 to 5.5
1.7
—
✓/✓
Pin programmable
✓
16-WLP (2.1 x 2.1)
MAX98502
2.5 to 5.5
1.7
3.4
✓/✓
Pin programmable
✓
16-WLP (2.1 x 2.1)
Digital Input Class D Speaker Amplifiers
Part
Supply Voltage
(V)
Output Power
at 1% THD+N (W)
Features
8Ω
4Ω
Gain
Input Type
Package
(mm x mm)
MAX98355A/
MAX98355B
2.5 to 5.5
1.4
2.5
3, 6, 9, 12, 15
PCM
9-WLP
(1.3 x 1.5)
MAX98356
2.5 to 5.5
1.4
2.5
3, 6, 9, 12, 15
PDM
9-WLP
(1.3 x 1.5)
13
Audio Product Guide
Capless, DirectDrive Headphone Amplifiers
Supply
Voltage (V)
Supply
Current
(mA)
Output
Offset
(mV)
MAX4409
1.8 to 3.6
5.0
MAX4410/
MAX4411
1.8 to 3.6
MAX9722
Part
Output Power at
1% THD+N (mW)
Package
(mm x mm)
Features
32Ω
16Ω
0.5
65
80
Ground noise rejection
5.0
0.5
65
80
Ultra-low distortion
2.4 to 5.5
5.5
0.5
130
70
Differential inputs
MAX9724
2.7 to 5.5
3.5
1.5
63
42
Industry's lowest RF
susceptibility
MAX9820
2.7 to 5.5
3.0
0.1
95
70
Windows Vista® premium
mobile compliant
10-TDFN (3 x 3)
1.6 to 2
1.15
0.1
34
40
Lowest quiescent current
12-WLP (1.7 x 1.3)
110
2VRMS into 600Ω
differential outputs
MAX97200
MAX97220–
MAX97220E
2.5 to 5.5
5.0
0.35
125
20-TQFN (4 x 4)
16-UCSP (2 x 2), 20-TQFN (4 x 4)
16-TQFN (3 x 3)
12-TQFN (3 x 3), 12-UCSP (1.5 x 2)
16-TQFN (3 x 3 x 0.8)
Audio Data Converters
Supply Voltage (V)
Part
48kHz DAC
Playback
Power
Consumption
(mW)
Playback
Dynamic
Range
(dB)
Features
Digital
Audio
Interface
MCLK
Range
(MHz)
Supported
Sample
Rates
(kHz)
Package
(mm x mm)
I2S
8.5 to
40
8 to 48
28-TQFN (5 x 5)
3 line inputs, 3 microphone
inputs, 2 line outputs,
2 headphone amps
I2S/TDM
10 to
60
8 to 96
40-TQFN (6 x 6)
90
2 microphone inputs,
1 headphone amp
I2S/TDM
10 to
60
8 to 48
24-TQFN (4 x 4)
5.5
92
2 line inputs, 2 microphone
inputs, 2 headphone amps,
1 aux ADC
I2S/TDM
10 to
60
8 to 48
30-WLP
(2 x 2.5),
32-TQFN (5 x 5)
5.5
101
4 line inputs,
2 headphone amplifiers,
2 speaker amplifiers
I2S/TDM
10 to
60
8 to 96
63-WLP,
56-TQFN
102
6 line inputs,
I2S/TDM
8 to
96
8 to 96
49-WLP,
40-TQFN
102
6 line inputs,
I2S/TDM
8 to
96
8 to 96
56-WLP
Core
I/O
MAX9850
(DAC)
1.8 to
3.6
1.8 to
3.6
10.1
91
2 line inputs, 2 line outputs,
2 headphone amps
MAX9856
(codec)
1.7 to
3.6
1.7 to
3.6
9
91
MAX9860
(codec)
1.7 to
1.9
1.7 to
3.6
4.5
MAX9867
(codec)
1.65 to
1.95
1.65 to
3.6
MAX98089
(codec)
1.65 to
3.6
1.65 to
2.0
MAX98090*
(codec)
1.65 to
3.6
MAX98091*
(codec)
1.65 to
3.6
1.65 to 2
1.65 to 2
14
3.6
3.6
Analog I/O
Audio Product Guide
Microphone Amplifiers With Integrated Mic Bias
Features
Supply
Voltage
(V)
Supply
Current
(µA)
InputNoise
Voltage
Density
(nV/√Hz)
SingleEnded
Differential
MAX4060
4.5 to 5.5
750
100
1
1
Adj
8-TDFN (3 x 3)
MAX4061
2.4 to 5.5
750
20
1
1
0dB, 20dB, 40dB
8-TDFN (3 x 3)
MAX4063
2.4 to 5.5
750
12
1
1
Adj
16-TQFN (4 x 4)
MAX4465/
MAX4466
2.4 to 5.5
24
80
1
Adj
✓
5-SC70 (2 x 2), 5-SOT23 (3 x 3)
MAX9812L/
MAX9813L
2.7 to 3.6
230
40
2
20dB
✓
6-SC70 (2 x 2.1) (MAX9812),
8-SOT23 (3 x 3) (MAX9813)
MAX9812H/
MAX9813H
4.5 to 5.5
230
40
2
20dB
✓
6-SC70 (2 x 2.1) (MAX9812),
8-SOT23 (3 x 3) (MAX9813)
MAX9814
2.7 to 5.5
3100
30
1
Automatic gain control
✓
14-TDFN (3 x 3)
Part
Inputs
Gain
Shutdown
Mode
Package
(mm x mm)
Specialty Audio Devices
Part
MAX9890
Supply Voltage (V)
Description
Package (mm x mm)
2.7 to 5.5
Headphone-amp click-pop suppressor
8-TDFN (3 x 3), 9-UCSP (1.5 x 1.5)
MAX9892
1.7 to 3.6
Audio shunt-mode click-pop suppressor
6-UCSP (1 x 1.5), 6-µDFN (2 x 2)
MAX4744
1.8 to 5.5
Dual SPDT audio switch
10-µDFN (2 x 2)
MAX4764
1.8 to 5.5
Dual SPDT audio switch
10-TDFN (3 x 3), 10-UCSP (1.5 x 2)
MAX4993/
MAX4994
1.8 to 5.5
DPDT audio switch
10-UTQFN (1.4 x 1.8)
MAX9895A*
2.5 to 4.5
Active noise-cancellation solution for stereo headphones
36-WLP (2.5 x 2.5 x 0.4), 40-TQFN (5 x 5)
15
Audio Product Guide
Integrated Audio Subsystems
Output Power at 1% THD+N*
Part
Supply
Voltage (V)
HP 32Ω
(mW)
HP
16Ω
(mW)
SP 8Ω
(W)
Features
SP 4Ω
(W)
Gain/Volume
Control
Package
(mm x mm)
Speaker
Amplifier
Other
Stereo Class D
6 single-ended
or 3 differential
audio inputs,
3D sound
36-UCSP (3 x 3)
MAX9775
2.7 to 5.5
50
60
2 x 1.1
2 x 1.5
I2C
MAX9776
2.7 to 5.5
50
60
1.1
1.5
I2C
Mono Class D
6 single-ended
or 3 differential
audio inputs,
3D sound
36-UCSP (3 x 3),
32-TQFN (5 x 5)
MAX9789
4.5 to 5.5
55
100
2x1
2x2
Pin
programmable
Stereo Class
AB
Integrated LDO
32-TQFN (5 x 5)
MAX9791
2.7 to 5.5
180
100
2 x 1.2
2 x 1.7
Adj
Stereo Class D
Wake-on-beep,
ground sense,
integrated LDO
28-TQFN (4 x 4)
MAX9792
2.7 to 5.5
180
100
1.5
2.5
Adj
Mono Class D
Wake-on-beep,
ground sense,
integrated LDO
28-TQFN (4 x 4)
Mono Class D
6 single-ended
or 3 differential
audio inputs,
3D sound
32-TQFN (5 x 5)
MAX9796
2.7 to 5.5
50
60
1.3
2.3
I2C
MAX9877
2.7 to 5.25
27
53
0.725
0.825
I2C
Mono Class D
2 stereo or 2
mono differential
audio inputs
20-WLP (2 x 2.5)
MAX9879
2.7 to 5.5
54
58
2 x 0.715
2x
0.825
I2C
Stereo Class D
2 stereo or 2
mono differential
audio inputs
30-UCSP (2.5 x 3)
Mono Class D
Integrated
LDO, bypass
switch, THD
limiter, Class H
headphone amp
25-WLP (2 x 2 x 0.4)
Mono Class D
Bypass switch,
THD limiter,
Class H
headphone amp
20-WLP (2 x 2.5)
Mono Class D
Class H
headphone amp,
2 stereo singleended/mono
differential
inputs
20-WLP (2 x 2.5)
MAX97000
2.7 to 5.5/
1.7 to 2.0
MAX97001
2.7 to 5.5/
1.6 to 2.0
MAX97003
2.7 to 5.5
*HP = headphone, SP = speaker
16
23
34
32
40
43
42
0.930
I2C
0.710
I2C
1
2.5
I2C
Audio Product Guide
Class A–Class H Amplifier Tutorial
Class A
The simplest type of amplifiers, Class A amplifiers, are those in which the output
transistors conduct (i.e., do not fully turn off), irrespective of the output signal
waveform. This type of amplifier is typically associated with high linearity, but low
efficiency.
Class B
Class B amplifiers are those in which the output transistors only conduct during
half (180°) of the signal waveform. To amplify the entire signal, they use two
transistors, one conducting for positive output signals and the other conducting
for negative outputs. Class B amplifiers are much more efficient than Class A
amplifiers, but they have high distortion due to the crossover point at which the
two transistors transition from on to off.
Class AB
A combination of Class A and Class B, the Class AB amplifier has
higher efficiency than Class A, but less distortion than Class B. This
performance is achieved by biasing both transistors to conduct near
zero signal output—the point where Class B amplifiers introduce
nonlinearities. They then transition to Class B for large excursions.
Thus, for small signals, both transistors are active, acting like a Class
A amplifier. For large signal excursions, only one transistor is active
for each half of the waveform, acting like a Class B amplifier.
Class D
CLASS D
MODULATOR
CLASS D
MOSFET
MODULATOR
DRIVER
MOSFET
DRIVER
Class D amplifiers are those that output a switching waveform at a
frequency far higher than the highest audio signal that needs to be
reproduced. The lowpass-filtered average value of this waveform
CLASS D
MOSFET
corresponds to the actual required
waveform. These amplifiers
MODULATORaudio
DRIVER
are highly efficient (often up to 90% or higher) because the output
transistors are either fully turned on or off during operation. This
approach completely eliminates the use of the linear region of the
transistor, which is responsible for the inefficiency of other amplifier
types. Modern Class D amplifiers achieve
fidelity
comparable
to
CLASS
D
MOSFET
MODULATOR
DRIVER
Class AB.
17
+V1+V2
Audio Product Guide
+V1
+V2
Class A–Class H Amplifier Tutorial (cont.)
-V2
-V1
-V1 -V2
Class G
+V1+V2
Class G amplifiers are similar to Class AB amplifiers, except that they use two or
more supply voltages. When operating at low signal levels, the amplifier selects
a low supply voltage. As the signal level increases, the amplifier automatically
+V1
selects the appropriate supply
voltage. Class G amplifiers are more efficient than
Class AB amplifiers because they use the maximum supply voltage only when
required, while a Class AB amplifier always uses the maximum supply voltage.
+V1
+V2
-V2
-V1
+V1
-V1
-V1 -V2
-V1
+V1
Class DG
+V1+V2
+V1
+V2
CLASS D
MODULATOR
MOSFET
DRIVER
-V2
-V1
+V1+V2
Class DG uses pulse-width modulation
(PWM), a rail-to-rail
+V1
digital output signal with variable duty cycle, to approximate
an analog input signal as in a Class D amplifier.
The Class
-V1
+V1
DG multilevel output stage also senses the magnitude of
the output signal and switches the supply rails+V2
as needed to
more efficiently supply the required signal power.
-V2
-V1
-V1 -V2
-V1
-V1 -V2+V1+V2
+V1
+V2
Class H
CLASS D
MODULATOR
MOSFET
DRIVER
Class H amplifiers modulate their supply voltage to minimize the voltage drop
across the output stage. Implementations range from using multiple discrete
voltages to an infinitely adjustable supply. Though similar to the Class G technique
of reducing dissipation across output devices, the Class H technique does not
require multiple power supplies. Class H amplifiers are generally more complex
than other designs, with extra control circuitry required to predict and control the
supply voltage.
-V2
+V1
-V1
-V1 -V2
+V1
-V1
-V1
+V1+V2
+V1
+V2
18
CLASS D
MODULATOR
MOSFET
DRIVER
-V2
-V1
Audio Product Guide
Theoretical Output Power
The following figure shows the theoretical output power possible from a range of supply voltages. Output power is specified at
1% and 10% THD+N with 4Ω and 8Ω loads. Real amplifiers will always output less power than shown in this figure.
Output Power vs. Supply Voltage
100
4Ω BTL, 10% THD+N
4Ω BTL, 1% THD+N
8Ω BTL, 10% THD+N
OUTPUT POWER (W)
10
8Ω BTL, 1% THD+N
1
0.1
3
8
13
18
23
28
SUPPLY VOLTAGE (V)
19
Audio Product Guide
DirectDrive is a registered trademark and registered service mark and FlexSound and UCSP are trademarks of Maxim Integrated Products, Inc.
Windows Vista is a registered trademark and registered service mark of Microsoft Corporation.
Contact Maxim Direct at 1.800.629.4642 or for more information, visit www.maximintegrated.com.
© 2012 Maxim Integrated. All rights reserved. The Maxim logo and Maxim Integrated are trademarks of Maxim Integrated Products, Inc. in the United States and
other jurisdictions throughout the world. All other company names may be trade names or trademarks of their respective owners.
Rev. 0; December 2012

Audio Product Guide

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