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MAX9791
Technical data
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MAXIM MAX9791, MAX9792 Technical data

General Description
The MAX9791 combines a stereo 2W Class D power amplifier, a stereo 180mW DirectDrive
®
headphone amplifier, and a 120mA low-dropout (LDO) linear regu­lator in a single device. The MAX9792 combines a mono 3W Class D power amplifier, a stereo 180mW DirectDrive headphone amplifier, and a 120mA LDO linear regulator in a single device.
The MAX9791/MAX9792 feature Maxim’s DirectDrive headphone amplifier architecture that produces a ground-referenced output from a single supply, eliminat­ing the need for large DC-blocking capacitors, saving cost, board space, and component height. High 107dB DC PSRR and low 0.006% THD+N ensure clean, low­distortion amplification of the audio signal.
The ground sense feature senses and corrects for the voltage difference between the output jack ground and device signal ground. This feature minimizes head­phone amplifier crosstalk by sensing the impedance in the ground return trace and correcting for it at the out­put jack. This feature also minimizes ground-loop noise when the output socket is used as a line out connection to other grounded equipment (for example, a PC con­nected to a home hi-fi system).
The MAX9791/MAX9792 feature low RF susceptibility, allowing the amplifiers to successfully operate in close proximity to wireless applications. The MAX9791/ MAX9792 Class D amplifiers feature Maxim’s spread­spectrum modulation and active emissions limiting cir­cuitry. Industry-leading click-and-pop suppression eliminates audible transients during power-up and shut­down cycles.
The MAX9791/MAX9792 wake-on-beep feature wakes up the speaker and headphone amplifiers when a qual­ified beep signal is detected at the BEEP input.
For maximum flexibility, separate speaker and head­phone amplifier control inputs provide independent shutdown of the speaker and headphone amplifiers. Additionally the LDO can be enabled independently of the audio amplifiers.
The MAX9791/MAX9792 feature thermal-overload and output short-circuit protection. The devices are avail­able in 28-pin TQFN packages and are specified over the -40°C to +85°C extended temperature range.
Applications
Notebook Computers
Tablet PCs
Portable Multimedia Players
Features
o Windows Vista® Premium Compliant o Low EMI Filterless Class D Speaker Amplifiers
Pass EN55022B Emissions Limit with 30cm of Speaker Cable
o 180mW DirectDrive Headphone Amplifier o Excellent RF Immunity o Integrated 120mA LDO o Eliminates Headphone Ground Loop Noise o Wake-on-Beep Function o Click-and-Pop Suppression o Short-Circuit and Thermal-Overload Protection o Thermally Efficient, Space-Saving Package
28-Pin TQFN-EP (4mm x 4mm x 0.75mm)
MAX9791/MAX9792
Windows Vista-Compliant Class D Speaker
Amplifiers with DirectDrive Headphone Amplifiers
________________________________________________________________
Maxim Integrated Products
1
19-4217; Rev 1; 6/10
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.
Ordering Information
Note: All devices are specified over the -40°C to +85°C extended temperature range.
+
Denotes a lead(Pb)-free/RoHS-compliant package.
*
EP = Exposed pad.
DirectDrive is a registered trademark of Maxim Integrated Products, Inc.
Windows Vista is a registered trademark of Microsoft Corp.
Simplified Block Diagrams
Simplified Block Diagrams continued at end of data sheet.
PART
MAX9791AETI+ Stereo 4.75V 28 TQFN-EP*
MAX9791BETI+ Stereo 3.3V 28 TQFN-EP*
MAX9791CETI+ Stereo 1.8V 28 TQFN-EP*
MAX9792AETI+ Mono 4.75V 28 TQFN-EP*
MAX9792CETI+ Mono 1.8V 28 TQFN-EP*
STEREO/
MONO
LDO
OUTPUT
PIN-PACKAGE
SPEAKER AND LDO
SUPPLY
2.7V TO 5.5V
MAX9791
SPKR_EN HP_EN LDO_EN BEEP
HEADPHONE SUPPLY
2.7V TO 5.5V
CLASS D
AMP
CLASS D
AMP
AVDD
LDO
1.8V, 3.3V, OR 4.75V
MAX9791/MAX9792
Windows Vista-Compliant Class D Speaker Amplifiers with DirectDrive Headphone Amplifiers
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
AVDD
= V
PVDD
= V
HPVDD
= 5V, V
GND
= V
PGND
= V
CPGND
= 0, I
LDO_OUT
= 0, C
LDO
= 2µF (C
LDO
= 4µF for 1.8V LDO option),
C1 = C2 = 1µF. R
L
= ∞, unless otherwise specified. R
IN1
= 20kΩ (A
VSPKR
= 12dB), R
IN2
= 40.2kΩ (A
VHP
= 0dB), C
IN1
= 470nF,
C
IN2=CCOM
= 1µF, TA= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at TA= +25°C.) (Note 3)
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.
Supply Voltage
(AVDD, PVDD, HPVDD to GND)........................-0.3V to +6.0V
(AVDD to PVDD) .............................................................±0.3V
GND to PGND, CPGND ......................................................±0.3V
CPVSS, C1N to GND ............................................-6.0V to + 0.3V
HPL, HPR to CPVSS ...........................................-0.3V to lower of
(HPVDD - CPVSS + 0.3V) and +9V
HPL, HPR to HPVDD..................................+0.3V to the higher of
(CPVSS - HPVDD - 0.3V) and -9V
COM, SENSE........................................................-0.3V to + 0.3V
Any Other Pin ..........................................-0.3V to (AVDD + 0.3V)
Duration of Short Circuit between OUT_+, OUT_- and GND,
PGND, AVDD, or PVDD..........................................Continuous
Duration of Short Circuit between LDO_OUT and AVDD,
GND (Note 1) .........................................................Continuous
Duration of Short Circuit between HPR, HPL and
GND .......................................................................Continuous
Continuous Current (PVDD, OUT_+, OUT_-, PGND)............1.7A
Continuous Current (C1N, C1P, CPVSS, AVDD, HPVDD,
LDO_OUT, HPR, HPL) ..................................................850mA
Continuous Input Current (All Other Pins) ........................±20mA
Continuous Power Dissipation (T
A
= +70°C)
28-Pin Thin QFN Single-Layer Board (derate 20.8mW/°C
above +70°C)..........................................................1667mW
Junction-to-Ambient Thermal Resistance (θ
JA
)
(Note 2) .....................................................................40°C/W
Junction-to-Case Thermal Resistance (θ
JC
)
(Note 2) ....................................................................2.7°C/W
28-Pin Thin QFN Multilayer Board (derate 28.6mW/°C
above +70°C)..........................................................2286mW
Junction-to-Ambient Thermal Resistance (θ
JA
)
(Note 2) .....................................................................35°C/W
Junction-to-Case Thermal Resistance (θ
JC
)
(Note 2) ....................................................................2.7°C/W
ESD Protection, Human Body Model ...................................±2kV
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Note 1: If short is present at power-up. Note 2: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer
board. For detailed information on package thermal considerations, refer to www.maxim-ic.com/thermal-tutorial
.
GENERAL
Supply Voltage
Headphone Supply Voltage V
Undervoltage Lockout UVLO 2.65 V
Quiescent Current
Shutdown Current I
Bias Voltage V
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
V
AVDD
V
PVDD
HPVDD
I
AVDD
I
PVD
I
HPVDD
SHDN
BIAS
,
Guaranteed by PSRR test (Note 4) 2.7 5.5 V
Guaranteed by PSRR test 2.7 5.5 V
MAX9791
+
+
MAX9792
SPKR_EN = 1.8V 3.3 7..3 µA
HP_INR, HP_INL, SPKR_INR, SPKR _INL 0 V
SPKR_EN HP_EN LDO_EN
1 0 1 250 400 µA
1 1 0 4.4 6
0 0 0 10.5 15
0 1 0 14.4 21
1 0 1 250 400 µA
1 1 0 4.4 6
0 0 0 10.5 18
0 1 0 14.4 24
mA
mA
MAX9791/MAX9792
Windows Vista-Compliant Class D Speaker
Amplifiers with DirectDrive Headphone Amplifiers
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(V
AVDD
= V
PVDD
= V
HPVDD
= 5V, V
GND
= V
PGND
= V
CPGND
= 0, I
LDO_OUT
= 0, C
LDO
= 2µF (C
LDO
= 4µF for 1.8V LDO option),
C1 = C2 = 1µF. R
L
= ∞, unless otherwise specified. R
IN1
= 20kΩ (A
VSPKR
= 12dB), R
IN2
= 40.2kΩ (A
VHP
= 0dB), C
IN1
= 470nF,
C
IN2=CCOM
= 1µF, TA= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at TA= +25°C.) (Note 3)
PARAMETER S YMBOL CONDITIONS MIN TYP MAX UNITS
Shutdown to Full Operation t
ON
0.4 ms
Overtemperature Thresho ld +150 °C
SPEAKER AMPLIFIER
THD+N = 1%, f = 1kHz, T
= +25°C
A
(Note 5)
Output Power P
OUT
THD+N = 10%, f = 1kHz, T
= +25°C
A
(Note 5)
Total Harmonic Distortion Plus Noise
THD+N
Power-Supply Rejection Ratio PSRR
RL = 8, P
R
= 4, P
L
V
AVDD
f = 217Hz, 200mV
f = 1kHz, 200mV
f = 10kHz, 200mV
Feedback Impedance R
Gain AV R
Output Offset Voltage V
Guaranteed by design 20 k
FSKR
= 20k 12 dB
IN1
OS
Measured between OUT_+ and OUT_-,
= +25°C
T
A
RL = 8, peak voltage,
Click-and-Pop Leve l K
CP
A-weighted, 32 samples per second (Notes 5, 6, and 7)
= 8
R
L
= 1.2W fIN = 1kH z,
Signal-to-Noise Ratio SNR
P
OUT
(Note 5)
= V
RL = 4 (MAX9791)
RL = 8 (MAX9791)
R
= 3
L
(MAX9792)
RL = 4 (MAX9791)
RL = 8 (MAX9791)
R
= 3
L
(MAX9792)
= 500mW, f = 1kHz (Note 5) 0.04
OUT
= 500mW, f = 1kHz (Note 5) 0.03
OUT
= 2.7V to 5.5V, TA = +25°C 60 80
PVDD
73
P-P
75
P-P
62
P-P
Into shutdown -52.4
Out of shutdown
A-weighted 98
20Hz to 20kH z 94
1.7
1.2
3
2.2
1.5
3.7
±3 ±10 mV
-54
Noise VN A-weighted 38 µV
L to R, R to L, RL = 8, VIN = -20dBFS = 100mV
Crosstalk
L to R, R to L, RL = 8, VIN = -20dBFS = 100mV
HP to SPKR, R R
LHP
, fIN = 1kHz (Note 5)
RMS
, fIN = 15kHz (Note 5)
RMS
= 8, PHP = 20mW,
LSPKR
= 32, fIN = 1kHz (Note 5)
78
70
77
W
%
dB
dBV
dB
RMS
dB
MAX9791/MAX9792
Windows Vista-Compliant Class D Speaker Amplifiers with DirectDrive Headphone Amplifiers
4 _______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS (continued)
(V
AVDD
= V
PVDD
= V
HPVDD
= 5V, V
GND
= V
PGND
= V
CPGND
= 0, I
LDO_OUT
= 0, C
LDO
= 2µF (C
LDO
= 4µF for 1.8V LDO option),
C1 = C2 = 1µF. R
L
= ∞, unless otherwise specified. R
IN1
= 20kΩ (A
VSPKR
= 12dB), R
IN2
= 40.2kΩ (A
VHP
= 0dB), C
IN1
= 470nF,
C
IN2=CCOM
= 1µF, TA= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at TA= +25°C.) (Note 3)
PARAMETER S YMBOL CONDITIONS MIN TYP MAX UNITS
Class D Switching Frequenc y f
948 1158 kHz
SPK
Spread-Spectrum Bandwidth ±15 kH z
Efficiency P
= 1.5W, fIN = 1kHz, RL = 8 (Note 5) 83 %
OUT
HEADPHONE AMPLIFIER
THD+N = 1%,
Output Power P
OUT
f = 1 kH z, T
= +25°C
A
RL = 32, fIN= 6kHz, 20kHz AES17, V
= -3dBFS = 212mV
IN
Total Harmonic Distortion Plus Noise
THD+N
RL = 10k, fIN = 6kHz, 20kHz AES17,
= -3dBFS = 500mV
V
IN
RL = 32, P
R
= 16, P
L
V
HPVDD
Power-Supply Rejection Ratio PSRR
f = 1 kH z, V
f = 10kHz, V
Feedback Impedance R
FHP
Gain AV R
Output Offset Voltage V
OS
38.2 40.2 42.2 k
= 40.2k 0 dB
IN2
TA = +25°C ±0.3 ±3 mV
RL = 32,
Click-and-Pop Leve l K
CP
peak voltage, A-weighted, 32 samples per second (Notes 6, 7)
R
= 32, P
Signal-to-Noise Ratio SNR
L
= 1kHz
f
IN
OUT
OUT
= 2.7V to 5.5V, TA = +25°C 70 107
RIPPLE
RIPPLE
OUT
RL = 16 100
= 32 180
R
L
RMS
RMS
-78
-87
= 100mW, f = 1kHz 0.006
= 75mW, f = 1 kHz 0.014
= 200mV
= 200mV
91
P-P
80
P-P
Into shutdown -81
= 40mW,
Out of shutdown
A-weighted 102
-72.5
20Hz to 20kH z 94
Noise VN A-weighted 8 µV
Maximum Capacitive Load
Crosstalk
No sustained oscillations 100 pF
C
L
L to R, R to L, f = 1kHz, COM and SENSE connected
L to R, R to L, f = 15kHz, COM and SENSE connected
SPKR to HP, R
= 32, fIN = 1Hz
R
LHP
RL = 32, VIN =
IN
-20dBFS = 30mV
R
= 10k, VIN =
L
-20dBFS = 0.7mV
RL = 32, VIN =
IN
-20dBFS = 30mV
R
= 10k, VIN =
L
-20dBFS = 70.7mV
= 8, P
LSPKR
SPKR
RMS
RMS
RMS
RMS
= 1W,
82
89
64
70
80
mW
dBFS
%
dB
dBV
dB
RMS
dB
MAX9791/MAX9792
Windows Vista-Compliant Class D Speaker
Amplifiers with DirectDrive Headphone Amplifiers
_______________________________________________________________________________________ 5
ELECTRICAL CHARACTERISTICS (continued)
(V
AVDD
= V
PVDD
= V
HPVDD
= 5V, V
GND
= V
PGND
= V
CPGND
= 0, I
LDO_OUT
= 0, C
LDO
= 2µF (C
LDO
= 4µF for 1.8V LDO option),
C1 = C2 = 1µF. R
L
= ∞, unless otherwise specified. R
IN1
= 20kΩ (A
VSPKR
= 12dB), R
IN2
= 40.2kΩ (A
VHP
= 0dB), C
IN1
= 470nF,
C
IN2=CCOM
= 1µF, TA= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at TA= +25°C.) (Note 3)
COM Input Range V
Common-Mode Rejection Ratio CMRR -300mV < V
PARAMETER S YMBOL CONDITIONS MIN TYP MAX UNITS
COM
Inferred from CMRR test -300 +300 mV
< +300mV 60 dB
COM
Slew Rate SR 0.38 V/µs
Charge-Pump Frequency f
OSC
530 kHz
BEEP INPUT (LDO_EN = 1)
Beep Signal Minimum
Ampl ifier Turn-On Time t
Amplifier Hold Time t
f
Four-cycle count 215 Hz
BEEP
0.4 ms
ONBEEP
HOLDBEEP
221 246 271 m s
LOW-DROPOUT LINEAR REGULATOR
LDO Ground Current I
Output Current I
Current Lim it I
Crosstalk
0.25 0.4 mA
LDO
OUT
LIM
Inferred from load regulation 120 mA
300 mA
Speaker to LDO, V f =1kHz, I
LDO_OUT
LDO_OUT
= 4.75V,
= 10mA, speaker P
OUT
-80 dB
= 1.2W, RL = 8 (Note 6)
Output-Voltage Accuracy
Dropout Voltage V
DO
V
LDO_OUT
V
LDO_OUT
V
LDO_OUT
T
A
= 4.75V ±1.5
= 3.3V ±1.5
I
= 50mA 46
= 4.75V,
= +25°C (Note 8)
OUT
I
= 120mA 106
OUT
Startup Time 30 µs
V
Line Regulation
Load Regulation
Ripple Rejection
Output-Voltage Noi se
= 5V to 5.5V, V
AVDD
I
LDO_OUT
V
AVDD
I
LDO_OUT
V
AVDD
I
LDO_OUT
V
LDO_OUT
= 1mA, C
= 4.5V to 5.5V, V
= 1mA, C
= 3V to 5.5V, V
= 1mA, C
= 4.75V, 1mA < I
120mA
V V I
RIPPLE
LDO_OUT
LDO_OUT
= 200mV
= 4.75V = 10mA
20Hz to 20kHz, C I
LDO_OUT
= 120mA
LDO_OUT
LDO
LDO
LDO_OUT
LDO
,
P-P
LDO_OUT
= 2µF
LDO_OUT
= 2µF
= 4µF
LDO_OUT
= 4.75V,
= 3.3V,
= 1.8V,
<
-4.8 1.5 +4.8
-4 0.2 +4
-6.4 2.5 +6.4
0.22 mV/mA
f = 1kHz 56
f = 10kHz 40
= 2 x 1µF,
130 µV
DIGITAL INPUTS (SPKR_EN, HP_EN, LDO_EN, BEEP)
Input-Voltage High V
Input-Voltage Low V
INH
INL
1.4 V
0.4 V
Input Bias Current -1 +1 µA
%
mV
mV/V
dB
RMS
Typical Operating Characteristics
(V
AVDD
= V
PVDD
= V
HPVDD
= 5V, V
GND
= V
PGND
= V
CPGND
= 0, I
LDO_OUT
= 0, C
LDO
= 2 x 1µF, C1 = C2 = 1µF. RL= ∞, unless oth-
erwise specified. R
IN1
= 20kΩ (A
VSPKR
= 12dB), R
IN2
= 40.2kΩ (A
VHP
= 0dB), C
IN1
= 470nF, C
IN2
= C
COM
= 1µF, measurement BW
= 20kHz AES17, T
A
= +25°C, unless otherwise noted. Speaker mode: SPKR_EN = 0, HP_EN = 0. Headphone mode: SPKR_EN = 1,
HP_EN = 1.)
MAX9791/MAX9792
Windows Vista-Compliant Class D Speaker Amplifiers with DirectDrive Headphone Amplifiers
6 _______________________________________________________________________________________
Note 3: All devices are 100% production tested at room temperature. All temperature limits are guaranteed by design. Note 4: AVDD and PVDD must be tied together. If LDO is enabled, set AVDD and PVDD as specified in the Line Regulation row of
the
Electrical Characteristics
table.
Note 5: Testing performed with a resistive load in series with an inductor to simulate an actual speaker load. For R
L
= 3Ω, L = 22µH.
For R
L
= 4Ω, L = 33µH. For RL= 8Ω, L = 68µH.
Note 6: Specified at T
A
= +25°C with an 8Ω + 68µH load connected across BTL output for speaker amplifier. Specified at TA= +25°C
with a 32Ω resistive load connected between HPR, HPL and GND for headphone amplifier. Speaker and headphone mode transitions are controlled by SPKR_EN and HP_EN inputs, respectively.
Note 7: Amplifier Inputs AC-coupled to GND. Note 8: Guaranteed by ATE characterization; limits are not production tested.
TOTAL HARMONIC DISTORTION + NOISE
vs. FREQUENCY (MAX9792 SPEAKER MODE)
MAX9791 toc01
FREQUENCY (kHz)
THD+N (dBFS)
0.1 1 10
-90
-80
-50
-40
-30
-70
-60
-20
-10
0
-100
0.01 100
RL = 3
Ω
V
IN
= -3dBFS
FS = 707mV
RMS
FS = 1V
RMS
TOTAL HARMONIC DISTORTION + NOISE
vs. FREQUENCY (MAX9791 SPEAKER MODE)
MAX9791 toc02
FREQUENCY (kHz)
THD+N (dBFS)
0.1 1 10
-90
-80
-50
-40
-30
-70
-60
-20
-10
0
-100
0.01 100
RL = 4
Ω
V
IN
= -3dBFS
FS = 707mV
RMS
FS = 1V
RMS
TOTAL HARMONIC DISTORTION + NOISE
vs. FREQUENCY (MAX9791 SPEAKER MODE)
MAX9791 toc03
FREQUENCY (kHz)
THD+N (dBFS)
0.1 1 10
-90
-80
-50
-40
-30
-70
-60
-20
-10
0
-100
0.01 100
RL = 8
Ω
V
IN
= -3dBFS
FS = 707mV
RMS
FS = 1V
RMS
TOTAL HARMONIC DISTORTION + NOISE
vs. OUTPUT POWER (MAX9792 SPEAKER MODE)
MAX9791 toc04
OUTPUT POWER (W)
THD+N (%)
1.0 2.0 3.0
0.01
0.1
1
10
100
0.001 0 4.00.5 1.5 2.5 3.5
RL = 3
Ω
f = 6kHz
f = 1kHz
f = 100Hz
TOTAL HARMONIC DISTORTION + NOISE
vs. OUTPUT POWER (MAX9791 SPEAKER MODE)
MAX9791 toc05
OUTPUT POWER (W)
THD+N (%)
2.01.51.0
0.01
0.1
1
10
100
0.001 0 3.02.50.5
RL = 4
Ω
f = 6kHz
f = 1kHz
f = 100Hz
TOTAL HARMONIC DISTORTION + NOISE
vs. OUTPUT POWER (MAX9791 SPEAKER MODE)
MAX9791 toc06
OUTPUT POWER (W)
THD+N (%)
0.5 1.0
0.01
0.1
1
10
100
0.001
02.01.5
RL = 8
Ω
f = 6kHz
f = 1kHz
f = 100Hz
ELECTRICAL CHARACTERISTICS (continued)
(V
AVDD
= V
PVDD
= V
HPVDD
= 5V, V
GND
= V
PGND
= V
CPGND
= 0, I
LDO_OUT
= 0, C
LDO
= 2µF (C
LDO
= 4µF for 1.8V LDO option),
C1 = C2 = 1µF. R
L
= ∞, unless otherwise specified. R
IN1
= 20kΩ (A
VSPKR
= 12dB), R
IN2
= 40.2kΩ (A
VHP
= 0dB), C
IN1
= 470nF,
C
IN2=CCOM
= 1µF, TA= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at TA= +25°C.) (Note 3)
SPEAKER
Typical Operating Characteristics (continued)
(V
AVDD
= V
PVDD
= V
HPVDD
= 5V, V
GND
= V
PGND
= V
CPGND
= 0, I
LDO_OUT
= 0, C
LDO
= 2 x 1µF, C1 = C2 = 1µF. RL= ∞, unless oth-
erwise specified. R
IN1
= 20kΩ (A
VSPKR
= 12dB), R
IN2
= 40.2kΩ (A
VHP
= 0dB), C
IN1
= 470nF, C
IN2
= C
COM
= 1µF, measurement BW
= 20kHz AES17, T
A
= +25°C, unless otherwise noted. Speaker mode: SPKR_EN = 0, HP_EN = 0. Headphone mode: SPKR_EN = 1,
HP_EN = 1.)
MAX9791/MAX9792
Windows Vista-Compliant Class D Speaker
Amplifiers with DirectDrive Headphone Amplifiers
_______________________________________________________________________________________
7
SPEAKER
OUTPUT POWER vs. LOAD RESISTANCE
(MAX9791 SPEAKER MODE)
3.0
2.5
2.0
1.5
1.0
OUTPUT POWER (W)
0.5
0
1 100
EFFICIENCY vs. OUTPUT POWER
(MAX9792 SPEAKER MODE)
90
RL = 8
80
70
60
50
40
EFFICIENCY (%)
30
20
10
0
01.5
OUTPUT POWER (W)
LOAD RESISTANCE (Ω)
Ω
OUTPUT POWER (W)
OUTPUT POWER vs. LOAD RESISTANCE
(MAX9792 SPEAKER MODE)
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
1 100
LOAD RESISTANCE (Ω)
f = 1kHz
THD+N = 10%
THD+N = 1%
10
RL = 3
Ω
V
= V
AVDD
= 3.7V
1.20.90.60.3
f
PVDD
IN
= 1kHz
f = 1kHz
THD+N = 10%
THD+N = 1%
10
MAX9791 toc08
MAX9791 toc09a
1.50
1.25
1.00
0.75
0.50
OUTPUT POWER (W)
0.25
100
EFFICIENCY (%)
MAX9791 toc07
OUTPUT POWER vs. LOAD RESISTANCE
(MAX9791 SPEAKER MODE)
V
PVDD
THD+N = 1%
0
1 100
EFFICIENCY vs. OUTPUT POWER
(MAX9791 SPEAKER MODE)
90
80
70
60
50
40
30
20
10
0
01.81.20.3
10
LOAD RESISTANCE (Ω)
OUTPUT POWER (W)
OUTPUT POWER vs. LOAD RESISTANCE
(MAX9792 SPEAKER MODE)
2.5
2.0
1.5
1.0
OUTPUT POWER (W)
0.5
0
1100
LOAD RESISTANCE (Ω)
THD+N = 1%
10
V
= V
PVDD
AVDD
THD+N = 10%
= 3.7V
MAX9791 toc07a
EFFICIENCY vs. OUTPUT POWER
(MAX9792 SPEAKER MODE)
MAX9791 toc08a
110
100
90
80
70
60
50
EFFICIENCY (%)
40
30
20
10
0
04.00.5 1.5 2.5 3.5
1.0 2.0 3.0 OUTPUT POWER (W)
RL = 8
RL = 3
fIN = 1kHz
Ω
= V
AVDD
THD+N = 10%
= 3.7V
EFFICIENCY vs. OUTPUT POWER
(MAX9791 SPEAKER MODE)
90
RL = 8
Ω
RL = 4
fIN = 1kHz
Ω
1.50.90.6
MAX9791 toc10
80
70
60
50
40
EFFICIENCY (%)
30
20
10
RL = 8
Ω
RL = 4
Ω
V
= V
PVDD
AVDD
= 1kHz
f
0
01.0
IN
OUTPUT POWER (W)
MAX9791 toc09
Ω
MAX9791 toc10a
= 3.7V
0.80.60.40.2
MAX9791/MAX9792
Windows Vista-Compliant Class D Speaker Amplifiers with DirectDrive Headphone Amplifiers
8 _______________________________________________________________________________________
Typical Operating Characteristics (continued)
(V
AVDD
= V
PVDD
= V
HPVDD
= 5V, V
GND
= V
PGND
= V
CPGND
= 0, I
LDO_OUT
= 0, C
LDO
= 2 x 1µF, C1 = C2 = 1µF. RL= ∞, unless oth-
erwise specified. R
IN1
= 20kΩ (A
VSPKR
= 12dB), R
IN2
= 40.2kΩ (A
VHP
= 0dB), C
IN1
= 470nF, C
IN2
= C
COM
= 1µF, measurement BW
= 20kHz AES17, T
A
= +25°C, unless otherwise noted. Speaker mode: SPKR_EN = 0, HP_EN = 0. Headphone mode: SPKR_EN = 1,
HP_EN = 1.)
SPEAKER
3.0
2.5
2.0
1.5
1.0
OUTPUT POWER (W)
0.5
0
2.5 5.5
OUTPUT POWER vs. SUPPLY VOLTAGE
(MAX9791 SPEAKER MODE)
f = 1kHz
= 4
R
Ω
LOAD
THD+N = 10%
THD+N = 1%
5.04.54.03.53.0
SUPPLY VOLTAGE (V)
MAX9791 toc10b
OUTPUT POWER (W)
OUTPUT POWER vs. SUPPLY VOLTAGE
2.0
1.5
1.0
0.5
(MAX9791 SPEAKER MODE)
f = 1kHz
= 8
R
Ω
LOAD
THD+N = 10%
THD+N = 1%
0
2.5 5.5 SUPPLY VOLTAGE (V)
OUTPUT POWER vs. SUPPLY VOLTAGE
(MAX9792 SPEAKER MODE)
2.5 f = 1kHz
= 8
R
Ω
MAX9791 toc10c
5.04.54.03.53.0
LOAD
2.0
1.5
1.0
OUTPUT POWER (W)
0.5
0
2.5 5.5
THD+N = 10%
SUPPLY VOLTAGE (V)
THD+N = 1%
MAX9791 toc10d
5.04.54.03.53.0
OUTPUT POWER vs. SUPPLY VOLTAGE
(MAX9792 SPEAKER MODE)
5.0 f = 1kHz
4.5
4.0
3.5
3.0
2.5
2.0
OUTPUT POWER (W)
1.5
1.0
0.5
= 3
R
Ω
LOAD
THD+N = 10%
THD+N = 1%
0
2.5 5.5 SUPPLY VOLTAGE
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY (SPEAKER MODE)
0
V
= 200mV
RIPPLE
-10
MAX9791 toc10e
5.04.54.03.53.0
RL = 8
-20
-30
-40
-50
PSRR (dB)
-60
-70
-80
-90
-100
0.01 100
P-P
Ω
LEFT
0.1 10
1
FREQUENCY (kHz)
RIGHT
MAX9791 toc11
-10
-20
-30
-40
-50
-60
-70
CROSSTALK (dB)
-80
-90
-100
-110
CROSSTALK vs. FREQUENCY
(SPEAKER MODE)
0
FS = 1V
RMS
VIN = -20dBFS
= 8
R
Ω
L
RIGHT TO LEFT
LEFT TO RIGHT
0.01 100
0.1 10
1
FREQUENCY (kHz)
MAX9791 toc12
Typical Operating Characteristics (continued)
(V
AVDD
= V
PVDD
= V
HPVDD
= 5V, V
GND
= V
PGND
= V
CPGND
= 0, I
LDO_OUT
= 0, C
LDO
= 2 x 1µF, C1 = C2 = 1µF. RL= ∞, unless oth-
erwise specified. R
IN1
= 20kΩ (A
VSPKR
= 12dB), R
IN2
= 40.2kΩ (A
VHP
= 0dB), C
IN1
= 470nF, C
IN2
= C
COM
= 1µF, measurement BW
= 20kHz AES17, T
A
= +25°C, unless otherwise noted. Speaker mode: SPKR_EN = 0, HP_EN = 0. Headphone mode: SPKR_EN = 1,
HP_EN = 1.)
MAX9791/MAX9792
Windows Vista-Compliant Class D Speaker
Amplifiers with DirectDrive Headphone Amplifiers
_______________________________________________________________________________________
9
µ
µ
SPEAKER
0
-10
-20
-30
-40
-50
-60
-70
-80
OUTPUT AMPLITUDE (dBV)
-90
-100
-110
-120 0 100
RBW = 1kHz INPUT AC GROUNDED
SPEAKER STARTUP WAVEFORM
s/div
200
MAX9791 toc13
WIDEBAND OUTPUT SPECTRUM
(SPEAKER MODE)
101
FREQUENCY (MHz)
SPKR_EN 2V/div
SPEAKER OUT
MAX9791 toc15
SPEAKER SHUTDOWN WAVEFORM
s/div
200
MAX9791 toc14
OUTPUT FREQUENCY SPECTRUM
(SPEAKER MODE)
0
V
= -60dBV
OUT
f = 1kHz
-20 = 8
R
Ω
L
UNWEIGHTED
-40
-60
-80
-100
OUTPUT MAGNITUDE (dBV)
-120
-140 120515
10
FREQUENCY (kHz)
SPKR_EN 2V/div
SPEAKER OUT
MAX9791 toc16
MAX9791/MAX9792
Windows Vista-Compliant Class D Speaker Amplifiers with DirectDrive Headphone Amplifiers
10 ______________________________________________________________________________________
Typical Operating Characteristics (continued)
(V
AVDD
= V
PVDD
= V
HPVDD
= 5V, V
GND
= V
PGND
= V
CPGND
= 0, I
LDO_OUT
= 0, C
LDO
= 2 x 1µF, C1 = C2 = 1µF. RL= ∞, unless oth-
erwise specified. R
IN1
= 20kΩ (A
VSPKR
= 12dB), R
IN2
= 40.2kΩ (A
VHP
= 0dB), C
IN1
= 470nF, C
IN2
= C
COM
= 1µF, measurement BW
= 20kHz AES17, T
A
= +25°C, unless otherwise noted. Speaker mode: SPKR_EN = 0, HP_EN = 0. Headphone mode: SPKR_EN = 1,
HP_EN = 1.)
HEADPHONE
TOTAL HARMONIC DISTORTION + NOISE
-50
-60
vs. FREQUENCY (HEADPHONE MODE)
RL = 16
Ω
= -3dBFS
V
IN
MAX9791 toc17
TOTAL HARMONIC DISTORTION + NOISE
vs. FREQUENCY (HEADPHONE MODE)
-50 V
= 3V
HPVDD
= 16
R
Ω
L
= -3dBFS
V
IN
-60
TOTAL HARMONIC DISTORTION + NOISE
vs. FREQUENCY (HEADPHONE MODE)
-50 RL = 32
Ω
= -3dBFS
V
MAX9791 toc18
IN
-60
MAX9791 toc19
-70
-80
THD+N (dBFS)
-90
-100
0.01 100
FS = 300mV
RMS
FS = 1V
RMS
0.1 10
1
FREQUENCY (kHz)
THD+N (dBFS)
TOTAL HARMONIC DISTORTION + NOISE
vs. FREQUENCY (HEADPHONE MODE)
-50 V
= 3V
HPVDD
= 32
R
Ω
L
= -3dBFS
V
IN
-60
-70
FS = 300mV
RMS
-80
THD+N (dBFS)
-90
-100
0.01 100
FS = 1V
RMS
0.1 10
1
FREQUENCY (kHz)
MAX9791 toc20
THD+N (%)
TOTAL HARMONIC DISTORTION + NOISE
vs. OUTPUT POWER (HEADPHONE MODE)
100
V
= 3V
HPVDD
= 16
R
Ω
L
10
MAX9791 toc23
-70
-80
-90
-100
0.01 100
FS = 300mV
FS = 1V
0.1 10 FREQUENCY (kHz)
RMS
RMS
1
TOTAL HARMONIC DISTORTION + NOISE
vs. OUTPUT POWER (HEADPHONE MODE)
100
RL = 16
Ω
10
1
f = 6kHz
0.1
0.01
0.001
f = 1kHz
f = 100Hz
0 200
OUTPUT POWER (mW)
12040 80
TOTAL HARMONIC DISTORTION + NOISE
vs. OUTPUT POWER (HEADPHONE MODE)
100
V
= 3V
HPVDD
= 32
R
Ω
L
10
160
MAX9791 toc21
MAX9791 toc24A
-70
FS = 300mV
-80
THD+N (dBFS)
-90
-100
0.01 100
RMS
FS = 1V
RMS
0.1 10
1
FREQUENCY (kHz)
TOTAL HARMONIC DISTORTION + NOISE
vs. OUTPUT POWER (HEADPHONE MODE)
100
RL = 32
Ω
10
1
THD+N (%)
0.1
f = 100Hz
0.01
0.001 050 250
f = 1kHz
100
150
OUTPUT POWER (mW)
f = 6kHz
200
OUTPUT POWER vs. LOAD RESISTANCE
(HEADPHONE MODE)
250
200
f = 1kHz
THD+N = 10%
MAX9791 toc22
MAX9791 toc25
1
f = 100Hz
THD+N (%)
0.1 f = 1kHz
0.01
0.001 05040 90
10
OUTPUT POWER (mW)
1
THD+N (%)
f = 6kHz
80
603020
70
0.1
f = 100Hz
0.01
0.001 05040 70
10
f = 1kHz
f = 6kHz
603020
OUTPUT POWER (mW)
150
100
OUTPUT POWER (mW)
50
0
1100
LOAD RESISTANCE (Ω)
THD+N = 1%
10
MAX9791/MAX9792
Windows Vista-Compliant Class D Speaker
Amplifiers with DirectDrive Headphone Amplifiers
______________________________________________________________________________________
11
Typical Operating Characteristics (continued)
(V
AVDD
= V
PVDD
= V
HPVDD
= 5V, V
GND
= V
PGND
= V
CPGND
= 0, I
LDO_OUT
= 0, C
LDO
= 2 x 1µF, C1 = C2 = 1µF. RL= ∞, unless oth-
erwise specified. R
IN1
= 20kΩ (A
VSPKR
= 12dB), R
IN2
= 40.2kΩ (A
VHP
= 0dB), C
IN1
= 470nF, C
IN2
= C
COM
= 1µF, measurement BW
= 20kHz AES17, T
A
= +25°C, unless otherwise noted. Speaker mode: SPKR_EN = 0, HP_EN = 0. Headphone mode: SPKR_EN = 1,
HP_EN = 1.)
HEADPHONE
OUTPUT POWER vs. LOAD RESISTANCE
(HEADPHONE MODE)
90
80
70
60
50
40
30
OUTPUT POWER (mW)
20
10
0
10 1000
100
LOAD RESISTANCE (Ω)
HEADPHONE OUTPUT POWER
vs. HPVDD
250
THD+N = 1% f = 1kHz
200
150
100
50
HEADPHONE OUTPUT POWER (mW)
0
2.5 5.5
RL = 32
HPVDD (V)
V
HPVDD
f = 1kHz
THD+N = 10%
THD+N = 1%
Ω
RL = 16
= 3V
Ω
5.04.54.03.53.0
400
350
MAX9791 toc26
300
250
200
150
100
50
POWER DISSIPATION PER CHANNEL (mW)
0
0
-10
-20
MAX9791 toc29
-30
-40
-50
-60
PSRR (dB)
-70
-80
-90
-100
-110
-120
POWER DISSIPATION vs. OUTPUT POWER
0 20025 75 125 175
0.01 100
(HEADPHONE MODE)
RL = 16
Ω
RL = 32
Ω
50 100 150
PER CHANNEL OUTPUT POWER (mW)
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY (HEADPHONE MODE)
V
= 200mV
RIPPLE
RL = 32
P-P
Ω
RIGHT
0.1 1 10 FREQUENCY (kHz)
LEFT
POWER DISSIPATION vs. OUTPUT POWER
(HEADPHONE MODE)
300
V
= 3V
HPVDD
250
MAX9791 toc27
200
150
100
50
POWER DISSIPATION PER CHANNEL (mW)
0
20
01008040 60
PER CHANNEL OUTPUT POWER (mW)
CROSSTALK vs. FREQUENCY
(HEADPHONE MODE)
-20 RIGHT TO LEFT
-30
MAX9791 toc30
COM AND SENSE DISABLED
-40
-50
-60
-70
CROSSTALK (dB)
-80
-90
-100
0.01 100
RIGHT TO LEFT COM AND SENSE DISABLED
RIGHT TO LEFT COM AND SENSE
0.1 1 10
RL = 16
Ω
RL = 32
LEFT TO RIGHT COM AND SENSE
FREQUENCY (kHz)
Ω
RL = 32 FS = 300mV VIN = -20dBFS
MAX9791 toc28
Ω
RMS
MAX9791 toc31
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