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MAX9792
User Manual
30 pgs650.87 Kb0

Rainbow Electronics MAX9792 User Manual

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 patented** 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, low-distortion 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 patented
†
spread-spectrum modulation and patented††active emissions limiting circuitry. Industry-leading click-and­pop 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
♦ Windows Vista® Premium Compliant ♦ Low EMI Filterless Class D Speaker Amplifiers
Pass EN55022B Emissions Limit with 30cm of Speaker Cable
♦ 180mW DirectDrive Headphone Amplifier ♦ Excellent RF Immunity ♦ Integrated 120mA LDO ♦ Eliminates Headphone Ground Loop Noise ♦ Wake-on-Beep Function ♦ Click-and-Pop Suppression ♦ Short-Circuit and Thermal-Overload Protection ♦ 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 0; 11/08
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-free/RoHS-compliant package.
*
EP = Exposed pad.
Windows Vista is a registered trademark of Microsoft Corp.
MAX9791A MAX9791B
SPKR_EN HP_EN LDO_EN BEEP
SPEAKER SUPPLY
4.5V TO 5.5V
HEADPHONE SUPPLY
2.7V TO 5.5V
LDO
4.5V TO 5.5V
3.3V OR 4.75V
CLASS D
AMP
CLASS D
AMP
Simplified Block Diagrams
Simplified Block Diagrams continued at end of data sheet.
DirectDrive is a registered trademark of Maxim Integrated Products, Inc.
**
U.S. Patent #7,061,327.
†
U.S. Patent #6,847,257.
††
U.S. Patent #7,190,225.
PART
MAX9791AETI+ Stereo 4.75V 28 TQFN-EP*
MAX9791BETI+ Stereo 3.3V 28 TQFN-EP*
MAX9792AETI+ Mono 4.75V 28 TQFN-EP*
STEREO/
MONO
LDO
OUTPUT
PIN-PACKAGE
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, C1 = C2 = 1µF. RL= ∞, unless other-
wise specified. R
IN1
= 20kΩ (A
VSPKR
= 12dB), R
IN2
= 40.2kΩ (A
VHP
= 0dB), C
IN1
= 470nF, C
IN2
= C
COM
= 1µF, TA= T
MIN
to T
MAX
,
unless otherwise noted. Typical values are at T
A
= +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
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
Shutdown to Full Operation t
Overtemperature Threshold +150 °C
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
V
AVDD
V
PVDD
HPVDD
I
AVDD
I
PVDD
I
HPVDD
SHDN
BIAS
ON
,
Guaranteed by PSRR test 4.5 5.5 V
Guaranteed by PSRR test 2.7 5.5 V
+
+
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 mA
0 0 0 10.5 15 mA
0 1 0 14.4 21 mA
1 0 0 0.1 1 µA
0.4 ms
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, C1 = C2 = 1µF. RL= ∞, unless other-
wise specified. R
IN1
= 20kΩ (A
VSPKR
= 12dB), R
IN2
= 40.2kΩ (A
VHP
= 0dB), C
IN1
= 470nF, C
IN2
= C
COM
= 1µF, TA= T
MIN
to T
MAX
,
unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 3)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
SPEAKER AMPLIFIER
Output Power P
Total Harmonic Distortion Plus Noise
OUT
THD+N
Power-Supply Rejection Ratio PSRR
Feedback Impedance R
Gain A
Output Offset Voltage V
Click-and-Pop Level K
FSKR
V
OS
CP
Signal-to-Noise Ratio SNR
Noise V
N
Crosstalk
THD+N = 1%, f = 1kHz,
= +25°C
T
A
(Note 4)
THD+N = 10%, f = 1kHz, T
= +25°C
A
(Note 4)
RL = 8Ω, P
R
= 4Ω, P
L
V
= V
AVDD
= 500mW, f = 1kHz (Note 4) 0.04
OUT
= 500mW, f = 1kHz (Note 4) 0.03
OUT
= 4.5V to 5.5V, TA = +25°C60 80
PVDD
f = 217Hz, 200mV
f = 1kHz, 200mV
P-P
f = 10kHz, 200mV
Guaranteed by design 20 kΩ
R
= 20kΩ 12 dB
IN1
Measured between OUT_+ and OUT_-, T
= +25°C
A
RL = 8Ω, peak voltage, A-weighted, 32 samples per second (Notes 4, 5, and 6)
R
= 8Ω
L
= 1.2W fIN = 1kHz,
P
OUT
(Note 4)
A-weighted 38 µV
L to R, R to L, RL = 8Ω, V 100m V
R M S
, f
I N
= 1kH z ( N ote 4)
L to R, R to L, RL = 8Ω, V 100m V
HP to SPKR, R R
LHP
, f
= 15kH z ( N ote 4)
R M S
I N
LSPKR
= 32Ω, fIN = 1kHz (Note 4)
RL = 4Ω (MAX9791)
RL = 8Ω (MAX9791)
= 3Ω
R
L
(MAX9792)
RL = 4Ω (MAX9791)
RL = 8Ω (MAX9791)
= 3Ω
R
L
(MAX9792)
P-P
P-P
Into shutdown -52.4
Out of shutdown
A-weighted 98
20Hz to 20kHz 94
= - 20d BFS =
I N
= - 20d BFS =
I N
= 8Ω, PHP = 20mW,
1.7
1.2
3
W
2.2
1.5
3.7
%
73
75
dB
62
±3 ±10 mV
dBV
-54
dB
RMS
78
70
dB
77
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, C1 = C2 = 1µF. RL= ∞, unless other-
wise specified. R
IN1
= 20kΩ (A
VSPKR
= 12dB), R
IN2
= 40.2kΩ (A
VHP
= 0dB), C
IN1
= 470nF, C
IN2
= C
COM
= 1µF, TA= T
MIN
to T
MAX
,
unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 3)
Class D Switching Frequency f
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
SPK
948 1158 kHz
Spread-Spectrum Bandwidth ±15 kHz
Efficiency η P
= 1.5W, fIN = 1kHz, RL = 8Ω (Note 4) 83 %
OUT
HEADPHONE AMPLIFIER
Output Power P
Total Harmonic Distortion Plus Noise
OUT
THD+N
Power-Supply Rejection Ratio PSRR
Feedback Impedance R
Gain A
Output Offset Voltage V
Click-and-Pop Level K
FHP
V
OS
CP
Signal-to-Noise Ratio SNR
Noise V
Maximum Capacitive Load Drive C
N
L
Crosstalk
THD+N = 1%, f = 1kHz, T
= +25°C
A
RL = 32Ω, f
= -3dBFS = 212mV
V
IN
= 6kHz, 20kHz AES17,
IN
RL = 10kΩ, fIN = 6kHz, 20kHz AES17, V
= -3dBFS = 500mV
IN
RL = 32Ω, P
= 16Ω, P
R
L
V
HPVDD
f = 1kHz, V
f = 10kHz, V
R
IN2
OUT
OUT
= 2.7V to 5.5V, TA = +25°C 70 107
RIPPLE
RIPPLE
= 40.2kΩ 0dB
TA = +25°C ±0.3 ±3 mV
RL = 32Ω, peak voltage, A-weighted, 32 samples per second (Notes 5, 6)
R
= 32Ω, P
L
f
= 1kHz
IN
OUT
A-weighted 8 µV
No sustained oscillations 100 pF
L to R, R to L, f
IN
= 1kHz, COM and SENSE connected
L to R, R to L, f
IN
= 15kHz, COM and SENSE connected
SPKR to HP, R
= 32Ω, fIN = 1Hz
R
LHP
LSPKR
RL = 16Ω 100
= 32Ω 180
R
L
RMS
RMS
-78
-87
= 100mW, f = 1kHz 0.006
= 75mW, f = 1kHz 0.014
= 200mV
= 200mV
P-P
P-P
91
80
38.2 40.2 42.2 kΩ
Into shutdown -81
= 40mW,
Out of shutdown
A-weighted 102
-72.5
20Hz to 20kHz 94
RL = 32Ω, VIN =
-20dBFS = 30mV
= 10kΩ, VIN =
R
L
-20dBFS = 0.7mV
RL = 32Ω, VIN =
-20dBFS = 30mV
= 10kΩ, VIN =
R
L
-20dBFS = 70.7mV
= 8Ω, P
SPKR
= 1W,
RMS
RMS
RMS
RMS
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, C1 = C2 = 1µF. RL= ∞, unless other-
wise specified. R
IN1
= 20kΩ (A
VSPKR
= 12dB), R
IN2
= 40.2kΩ (A
VHP
= 0dB), C
IN1
= 470nF, C
IN2
= C
COM
= 1µF, TA= T
MIN
to T
MAX
,
unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 3)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
COM Input Range V
COM
Common-Mode Rejection Ratio CMRR -300mV < V
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 Frequency f
Amplifier Turn-On Time t
Amplifier Hold Time t
HOLDBEEP
BEEP
ONBEEP
Four-cycle count 215 Hz
400 µs
221 246 271 ms
LOW-DROPOUT LINEAR REGULATOR
Regulator Input Voltage Range V
LDO Ground Current I
Output Current I
Current Limit I
Crosstalk
AVDD
LDO
OUT
LIM
Inferred from line regulation, V
LDO_OUT
= 4.75V
Inferred from load regulation 120 mA
Speaker to LDO, V f =1kHz, I
LDO_OUT
LDO_OUT
= 10mA, speaker P
= 4.75V,
OUT
4.5 5.5 V
0.25 0.4 mA
300 mA
-80 dB
= 1.2W, RL = 8Ω
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 7)
OUT
I
= 120mA 106
OUT
Startup Time 30 µs
V
= 4.5V to
Line Regulation
Load Regulation
Ripple Rejection
Output-Voltage Noise
AVDD
5.5V, I
LDO_OUT
V
LDO_OUT
= 1mA
= 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
P-P
V
V
,
LDO_OUT
LDO_OUT
= 4.75V -4.8 1.5 +4.8
= 3.3V -4 0.2 +4
LDO_OUT
<
f = 1kHz 56
f = 10kHz 40
LDO_OUT
= 2 x 1µF,
0.22 mV/mA
130 µV
DIGITAL INPUTS (SPKR_EN, HP_EN, LDO_EN, BEEP)
Input-Voltage High V
Input-Voltage Low V
INH
INL
2V
0.4 V
Input Bias Current -1 +1 µA
%
mV
mV/V
dB
RMS
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: 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 5: 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 6: Amplifier Inputs AC-coupled to GND. Note 7: 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 = 3Ω 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 = 4Ω 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 = 8Ω 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 = 3Ω
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 = 4Ω
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 0 2.01.5
RL = 8Ω
f = 6kHz
f = 1kHz
f = 100Hz
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.)
SPEAKER
ELECTRICAL CHARACTERISTICS (continued)
(V
AVDD
= V
PVDD
= V
HPVDD
= 5V, V
GND
= V
PGND
= V
CPGND
= 0, I
LDO_OUT
= 0, C
LDO
= 2µF, C1 = C2 = 1µF. RL= ∞, unless other-
wise specified. R
IN1
= 20kΩ (A
VSPKR
= 12dB), R
IN2
= 40.2kΩ (A
VHP
= 0dB), C
IN1
= 470nF, C
IN2
= C
COM
= 1µF, TA= T
MIN
to T
MAX
,
unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 3)
MAX9791/MAX9792
Windows Vista-Compliant Class D Speaker
Amplifiers with DirectDrive Headphone Amplifiers
_______________________________________________________________________________________
7
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
OUTPUT POWER vs. LOAD RESISTANCE
(MAX9792 SPEAKER MODE)
5.0
4.5
4.0
3.5
3.0
2.5
2.0
OUTPUT POWER (W)
1.5
1.0
0.5
0
1 100
THD+N = 10%
10
LOAD RESISTANCE (Ω)
EFFICIENCY vs. OUTPUT POWER
(MAX9791 SPEAKER MODE)
100
90
80 70 60 50 40
EFFICIENCY (%)
30 20
10
0
0 1.81.20.3
OUTPUT POWER (W)
f = 1kHz
THD+N = 1%
RL = 8Ω
RL = 4Ω
fIN = 1kHz
1.50.90.6
MAX9791 toc07
OUTPUT POWER (W)
MAX9791 toc10
PSRR (dB)
-100
OUTPUT POWER vs. LOAD RESISTANCE
3.0
2.5
2.0
1.5
1.0
0.5
-10
-20
-30
-40
-50
-60
-70
-80
-90
(MAX9791 SPEAKER MODE)
f = 1kHz
THD+N = 10%
THD+N = 1%
0
1 100
10
LOAD RESISTANCE (Ω)
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY (SPEAKER MODE)
0
V
= 200mV
RIPPLE
RL = 8Ω
0.01 100
P-P
LEFT
0.1 10
1
FREQUENCY (kHz)
RIGHT
EFFICIENCY vs. OUTPUT POWER
(MAX9792 SPEAKER MODE)
110
MAX9791 toc08
100
90 80 70 60 50
EFFICIENCY (%)
40 30 20 10
0
1.0 2.0 3.0
0 4.00.5 1.5 2.5 3.5
OUTPUT POWER (W)
RL = 8Ω
CROSSTALK vs. FREQUENCY
(SPEAKER MODE)
0
FS = 1V
RMS
VIN = -20dBFS
= 8Ω
R
L
RIGHT TO LEFT
LEFT TO RIGHT
0.01 100
0.1 10
1
FREQUENCY (kHz)
MAX9791 toc11
-10
-20
-30
-40
-50
-60
-70
CROSSTALK (dB)
-80
-90
-100
-110
MAX9791 toc09
RL = 3Ω
fIN = 1kHz
MAX9791 toc12
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
SPEAKER STARTUP WAVEFORM
MAX9791 toc13
SPEAKER SHUTDOWN WAVEFORM
MAX9791 toc14
200μs/div
WIDEBAND OUTPUT SPECTRUM
0
-10
-20
-30
-40
-50
-60
-70
-80
OUTPUT AMPLITUDE (dBV)
-90
-100
-110
-120 0 100
(SPEAKER MODE)
RBW = 1kHz INPUT AC GROUNDED
FREQUENCY (MHz)
101
SPKR_EN 2V/div
SPEAKER OUT
MAX9791 toc15
200μs/div
OUTPUT FREQUENCY SPECTRUM
(SPEAKER MODE)
0
V
= -60dBV
OUT
f = 1kHz
-20
= 8Ω
R
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
_______________________________________________________________________________________
9
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
vs. FREQUENCY (HEADPHONE MODE)
-50
RL = 16Ω
= -3dBFS
V
IN
-60
-70
-80
THD+N (dBFS)
-90
-100
0.01 100
FS = 300mV
FS = 1V
RMS
0.1 10
1
FREQUENCY (kHz)
TOTAL HARMONIC DISTORTION + NOISE
vs. FREQUENCY (HEADPHONE MODE)
-50
V
= 3V
HPVDD
= 32Ω
R
L
= -3dBFS
V
IN
-60
RMS
MAX9791 toc17
THD+N (dBFS)
-100
MAX9791 toc20
-50
-60
-70
-80
-90
0.01 100
vs. OUTPUT POWER (HEADPHONE MODE)
100
10
TOTAL HARMONIC DISTORTION + NOISE
vs. FREQUENCY (HEADPHONE MODE)
V
= 3V
HPVDD
= 16Ω
R
L
= -3dBFS
V
IN
FS = 300mV
FS = 1V
0.1 10 FREQUENCY (kHz)
RMS
RMS
1
TOTAL HARMONIC DISTORTION + NOISE
RL = 16Ω
TOTAL HARMONIC DISTORTION + NOISE
vs. FREQUENCY (HEADPHONE MODE)
-50
RL = 32Ω
= -3dBFS
V
MAX9791 toc18
IN
-60
-70
FS = 300mV
RMS
-80
THD+N (dBFS)
-90
-100
0.01 100
FS = 1V
RMS
0.1 10
1
FREQUENCY (kHz)
TOTAL HARMONIC DISTORTION + NOISE
vs. OUTPUT POWER (HEADPHONE MODE)
100
RL = 32Ω
MAX9791 toc21
10
MAX9791 toc19
MAX9791 toc22
-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
V
= 3V
HPVDD
= 16Ω
R
L
10
1
f = 100Hz
THD+N (%)
0.1
f = 1kHz
0.01
0.001 05040 90
10
OUTPUT POWER (mW)
603020
f = 6kHz
70
1
THD+N (%)
0.1
0.01
0.001
f = 6kHz
f = 1kHz
f = 100Hz
0 200
OUTPUT POWER (mW)
12040 80
160
TOTAL HARMONIC DISTORTION + NOISE
vs. OUTPUT POWER (HEADPHONE MODE)
100
V
= 3V
HPVDD
= 32Ω
R
MAX9791 toc23
80
L
10
1
THD+N (%)
0.1
f = 100Hz
0.01
0.001 05040 70
10
f = 1kHz
OUTPUT POWER (mW)
MAX9791 toc24A
f = 6kHz
603020
1
THD+N (%)
0.1
f = 100Hz
0.01
0.001 0 50 250
f = 1kHz
100
150
OUTPUT POWER (mW)
OUTPUT POWER vs. LOAD RESISTANCE
(HEADPHONE MODE)
250
200
150
100
OUTPUT POWER (mW)
50
0
1 100
LOAD RESISTANCE (Ω)
f = 1kHz
THD+N = 10%
10
f = 6kHz
200
MAX9791 toc25
THD+N = 1%
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