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MAX9775
Technical data
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MAXIM MAX9775, MAX9776 Technical data

General Description
The MAX9775/MAX9776 combine a high-efficiency Class D, stereo/mono audio power amplifier with a mono DirectDrive
®
receiver amplifier and a stereo
DirectDrive headphone amplifier.
1.5W per channel into a 4Ω load from a 5V supply and offer efficiencies up to 79%. Active emissions limiting circuitry and spread-spectrum modulation greatly reduce EMI, eliminating the need for output filtering found in traditional Class D devices.
The MAX9775/MAX9776 utilize a fully differential archi­tecture, a full-bridged output, and comprehensive click­and-pop suppression. A 3D stereo enhancement function allows the MAX9775 to widen the stereo sound field immersing the listener in a cleaner, richer sound experience than typically found in portable applications. The devices utilize a flexible, user-defined mixer archi­tecture that includes an input mixer, volume control, and output mixer. All control is done through I2C.
The mono receiver amplifier and stereo headphone amplifier use Maxim’s DirectDrive architecture that pro­duces a ground-referenced output from a single supply, eliminating the need for large DC-blocking capacitors, saving cost, space, and component height.
The MAX9775 is available in a 36-bump WLP (3mm x 3mm) package. The MAX9776 is available in a 32-pin TQFN (5mm x 5mm) or a 36-bump WLP (3mm x 3mm) package. Both devices are specified over the extended
-40°C to +85°C temperature range.
Applications
Cell Phones Portable Multimedia Players Handheld Gaming Consoles
Features
♦ Unique Spread-Spectrum Modulation and Active
Emissions Limiting Significantly Reduces EMI
♦ 3D Stereo Enhancement (MAX9775 Only) ♦ Up to 3 Stereo Inputs ♦ 1.5W Stereo Speaker Output (4Ω, V
DD
= 5V)
♦ 50mW Mono Receiver/Stereo Headphone Outputs
(32Ω, V
DD
= 3.3V)
♦ High PSRR (68dB at 217Hz) ♦ 79% Efficiency (V
DD
= 3.3V, RL= 8Ω, P
OUT
=
470mW)
♦ I
2
C Control—Input Configuration, Volume Control,
Output Mode
♦ Click-and-Pop Suppression ♦ Low Total Harmonic Distortion (0.03% at 1kHz) ♦ Current-Limit and Thermal Protection ♦ Available in Space-Saving, 36-Bump WLP (3mm x
3mm) and 32-Pin TQFN (5mm x 5mm) Packages
MAX9775/MAX9776
2 x 1.5W, Stereo Class D Audio Subsystem
with DirectDrive Headphone Amplifier
________________________________________________________________
Maxim Integrated Products
1
Ordering Information
MAX9775
MIXER/
MUX
GAIN
CONTROL
3D
SOUND
CONTROL
I2C
INTERFACE
SINGLE SUPPLY 2.7V TO 5.5V
MAX9776
MIXER/
MUX
GAIN
CONTROL
I2C
INTERFACE
SINGLE SUPPLY 2.7V TO 5.5V
Simplified Block Diagrams
19-0746; Rev 4; 8/08
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.
Pin Configurations appear at end of data sheet.
PART PIN-PACKAGE
CLASS D
AMPLIFIER
MAX9775EBX+T 36 WLP* Stereo
MAX9776ETJ+ 32 TQFN-EP** Mono
MAX9776EBX+T 36 WLP* Mono
Note: All devices are specified over the -40°C to +85°C oper­ating temperature range.
+
Denotes a lead-free/RoHS-compliant package.
*
Four center bumps depopulated.
**
EP = Exposed pad.
DirectDrive is a registered trademark of Maxim Integrated Products, Inc.
MAX9775/MAX9776
2 x 1.5W, Stereo Class D Audio Subsystem with DirectDrive Headphone Amplifier
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(VDD= PVDD= CPVDD= 3.3V, V
GND
= V
PGND
= V
CPGND
= 0V, SHDN = VDD, I2C settings (INA gain = +20dB, INB gain = INC gain =
0dB, volume setting = 0dB, mono path gain = 0dB, SHDN = 1, SSM = 1). Speaker load resistors (R
LSP
) are terminated between
OUT_+ and OUT_-, headphone load resistors are terminated to GND, unless otherwise noted. C1 = C2 = C3 = 1µF. T
A
= T
MIN
to
T
MAX
, unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)
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.
VDDto GND..............................................................................6V
PV
DD
to PGND .........................................................................6V
CPV
DD
to CPGND ....................................................................6V
CPV
SS
to CPGND .....................................................-6V to +0.3V
V
SS
to CPGND..........................................................-6V to +0.3V
C1N .......................................(CPV
SS
- 0.3V) to (CPGND + 0.3V)
C1P.......................................(CPGND - 0.3V) to (CPV
DD
+ 0.3V)
HPL, HPR to GND...................(CPV
SS
- 0.3V) to (CPVDD+ 0.3V)
GND to PGND and CPGND................................................±0.3V
V
DD
to PVDDand CPVDD....................................................±0.3V
SDA, SCL to GND.....................................................-0.3V to +6V
All other pins to GND..................................-0.3V to (V
DD
+ 0.3V)
Continuous Current In/Out of PV
DD
, PGND, CPVDD, CPGND,
OUT__, HPR, and HPL..................................................±800mA
Continuous Input Current CPV
SS
......................................260mA
Continuous Input Current (all other pins) .........................±20mA
Duration of Short Circuit Between
OUT_+ and OUT_- ..................................................Continuous
Duration of HP_, OUT_ Short Circuit to
GND or PV
DD
..........................................................Continuous
Continuous Power Dissipation (T
A
= +70°C) 36-Bump (3mm x 3mm) UCSP Multilayer Board
(derate 17.0mW/°C above +70°C)...........................1360.5mW
32-Pin (5mm x 5mm) TQFN Single-Layer Board
(derate 21.3mW/°C above +70°C)...........................1702.1mW
32-Pin TQFN Multilayer Board (derate 34.5mW/°C
above +70°C)...........................................................2758.6mW
Junction Temperature......................................................+150°C
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
GENERAL
Supply Voltage Range
Quiescent Current (Mono) I
Quiescent Current (Stereo) I
Mute Current I
Shutdown Current I
Turn-On Time t
Input Resistance R
Common-Mode Rejection Ratio CMRR TA = +25°C, fIN = 1kHz (Note 2) 45 50 60 dB
Input DC Bias Voltage V
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
V
DD
C
, P
PVDD
DD
DD
MUTE
SHDN
ON
IN
BIAS
VDD
,
Inferred from PSRR test 2.7 5.5 V
Output mode 1, 6, 11 (Rx mode) 6.3 10
Output mode 4, 9, 14 (HP mode) 8 12.6
Output mode 2, 7, 12 (SP mode) 9.5 15
Output mode 3, 8, 13 (SP and HP mode) 12.9 18
Output mode 1, 6, 11 (Rx mode) 7
Output mode 4, 9, 14 (HP mode) 9
Output mode 2, 7, 12 (SP mode) 16.5
Output mode 3, 8, 13 (SP and HP mode) 20
Current in mute (low power) 4.7 10 mA Hard shutdown SHDN = GND 0.1 10
Soft shutdown
Time from shutdown or power-on to full operation
B and C pair inputs, TA = +25°C, VOL = max
A pair inputs, TA = +25°C, +20dB 3.5 5.5 8.0 kΩ
IN_ inputs 1.12 1.25 1.38 V
See the I section
2
C Interface
17.5 28 41.0 kΩ
8.5 15
30 ms
mA
mA
µA
MAX9775/MAX9776
2 x 1.5W, Stereo Class D Audio Subsystem
with DirectDrive Headphone Amplifier
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(VDD= PVDD= CPVDD= 3.3V, V
GND
= V
PGND
= V
CPGND
= 0V, SHDN = VDD, I2C settings (INA gain = +20dB, INB gain = INC gain =
0dB, volume setting = 0dB, mono path gain = 0dB, SHDN = 1, SSM = 1). Speaker load resistors (R
LSP
) are terminated between
OUT_+ and OUT_-, headphone load resistors are terminated to GND, unless otherwise noted. C1 = C2 = C3 = 1µF. T
A
= T
MIN
to
T
MAX
, unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
SPEAKER AMPLIFIERS
Output Offset Voltage V
Click-and-Pop Level K
Power-Supply Rejection Ratio (Note 3)
Current Limit 1.6 A
Total Harmonic Distortion Plus Noise (Note 4)
Signal-to-Noise Ratio SNR
Output Frequency f
Efficiency η
Gain A
Channel-to-Channel Gain Tracking (Note 5)
3D Sound Resistors (Note 5) R
Crosstalk (Notes 4, 5)
OS
CP
PSRR T
OUT
THD+N f = 1kHz
OSC
TA = +25°C ±5.5 ±23.5
T
≤ TA ≤ T
MIN
P eak vol tag e,
= + 25°C ,
T
A
A- w ei g hted , 32 sam p l es p er second ( N otes 2, 3)
MAX
Into shutdown -62
Out of shutdown -60
Into mute -63
Out of mute -62
VDD = 2.7V to 5.5V 48 70
f = 217Hz,
P-P
P-P
ripple
ripple
= +25°C
A
100mV
f = 1kHz, 100mV
f = 20kHz,
P-P
ripple
100mV
RL = 4Ω, VDD = 5V 1500
THD+N = 1%,
= +25°C
T
A
RL = 8Ω, VDD = 3.3V 450Output Power (Note 4) P
R
= 8Ω, VDD = 5V 1115
L
RL = 8Ω, P
= 125mW
OUT
R
= 4Ω,
L
P
= 250mW
OUT
V
= 1.8V
OUT
R
= 8Ω, 3D not
L
active (Note 3)
RMS
,
BW = 20Hz to 20kHz 81
A-weighted 84
Fixed-frequency modulation 1100
Spread-spectrum modulation 1100 ± 30
P
= 470mW, f = 1kHz both channels
OUT
driven, L = 68µH in series with 8Ω load
V
= +25°C ±1 %
T
A
Used with 22nF and 2.2nF external
3D
capacitors
L to R, R to L, f = 10kHz, R
= 300mV
V
OUT
RMS
= 8Ω,
L
579kΩ
±40
68
60
50
0.03
0.04
79 %
12 dB
73 dB
mV
dB
dB
mW
dB
kHz
%
MAX9775/MAX9776
2 x 1.5W, Stereo Class D Audio Subsystem with DirectDrive Headphone Amplifier
4 _______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS (continued)
(VDD= PVDD= CPVDD= 3.3V, V
GND
= V
PGND
= V
CPGND
= 0V, SHDN = VDD, I2C settings (INA gain = +20dB, INB gain = INC gain =
0dB, volume setting = 0dB, mono path gain = 0dB, SHDN = 1, SSM = 1). Speaker load resistors (R
LSP
) are terminated between
OUT_+ and OUT_-, headphone load resistors are terminated to GND, unless otherwise noted. C1 = C2 = C3 = 1µF. T
A
= T
MIN
to
T
MAX
, unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)
RECEIVER AMPLIFIER
Output Offset Voltage V
Click-and-Pop Level K
Power-Supply Rejection Ratio (Note 3)
Output Power P
Gain A
Total Harmonic Distortion Plus Noise
Signal-to-Noise Ratio SNR
Slew Rate SR 0.3 V/µs
Capacitive Drive C
HEADPHONE AMPLIFIERS
Output Offset Voltage V
Click-and-Pop Level K
ESD Protection HP_
Power-Supply Rejection Ratio (Note 3)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
OS
CP
PSRR T
OUT
V
THD+N
L
OS
CP
PSRR T
TA = +25°C ±1.8 ±5.5 mV
Peak voltage, TA = +25°C, A-weighted, 32 samples per second (Notes 3, 6)
= +25°C
A
TA = +25°C, THD+N = 1%
RL = 16Ω (V
= 32Ω (V
R
L
R
= 16Ω, V
L
800mV
TA = +25°C ±1.8 ±5.5 mV
Peak voltage, TA = +25°C, A-weighted, 32 samples per second (Notes 2, 4)
= +25°C
A
RMS
OUT
OUT
OUT
(Note 3)
Into shutdown -62
Into mute -67
Out of shutdown -63
Out of mute -66
VDD = 2.7V to 5.5V 58 80
f = 217Hz, 100mV
f = 1kHz, 100mV
f = 20kHz, 100mV
RL = 16Ω 60
R
L
= 800mV
= 800mV
BW = 20Hz to 20kHz 87
=
A-weighted 89
Into shutdown -61
Into mute -65
Out of shutdown -60
Out of mute -64
Contact ±4
Air ±8
VDD = 2.7V to 5.5V 58 80
f = 217Hz, 100mV
f = 1kHz, 100mV
f = 20kHz, 100mV
ripple
P-P
ripple
P-P
ripple
P-P
= 32Ω 50
, f = 1kHz) 0.03
RMS
, f = 1kHz) 0.024
RMS
ripple
P-P
ripple
P-P
ripple
P-P
80
70
62
3dB
300 pF
80
70
62
dB
dB
mW
%
dB
dB
kV
dB
MAX9775/MAX9776
2 x 1.5W, Stereo Class D Audio Subsystem
with DirectDrive Headphone Amplifier
_______________________________________________________________________________________ 5
ELECTRICAL CHARACTERISTICS (continued)
(VDD= PVDD= CPVDD= 3.3V, V
GND
= V
PGND
= V
CPGND
= 0V, SHDN = VDD, I2C settings (INA gain = +20dB, INB gain = INC gain =
0dB, volume setting = 0dB, mono path gain = 0dB, SHDN = 1, SSM = 1). Speaker load resistors (R
LSP
) are terminated between
OUT_+ and OUT_-, headphone load resistors are terminated to GND, unless otherwise noted. C1 = C2 = C3 = 1µF. T
A
= T
MIN
to
T
MAX
, unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)
Output Power P
Current Limit 170 mA
Gain A
Channel-to-Channel Gain Tracking
Total Harmonic Distortion Plus Noise
Signal-to-Noise Ratio SNR
Slew Rate SR 0.3 V/µs
Capacitive Drive C
Crosstalk
VOLUME CONTROL
Volume Control
Mono Gain All outputs
Input Pair A Control
Mute Attenuation (Minimum Volume)
DIGITAL INPUTS (SHDN, SDA, SCL)
Input-Voltage High V
Input-Voltage Low V
Input Hysteresis (SDA, SCL) V
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
THD+N
OUT
V
L
IH
IL
HYS
TA = +25°C, THD+N = 1%
T
= +25°C ±1 %
A
RL = 16Ω (V
R
= 32Ω (V
L
R
= 16Ω,
L
V
OUT
L to R, R to L, f = 10kHz, R V
OUT
IN+6dB = 0 (minimum gain setting)
IN+6dB = 1 (maximum gain setting)
INA+20dB = 0 (minimum gain setting) Set by IN+6dB
INA+20dB = 1 (maximum gain setting) 20
V
= 1V
IN
OUT
OUT
= 800mV
= 160mV
RMS
RMS
RMS
RL = 16Ω 60
R
= 32Ω 50
L
= 800mV
= 800mV
, f = 1kHz) 0.03
RMS
, f = 1kHz) 0.024
RMS
BW = 20Hz to 20kHz
A-weighted 93
= 16Ω,
L
HP gain (max) 3
SP gain (max) 12
HP gain (min) -72
SP gain (min) -63
HP gain (max) 9
SP gain (max) 18
HP gain (min) -61
SP gain (min) -57
Mono+6dB = 0 0
Mono+6dB = 1 6
1.4 V
+3 dB
92
300 pF
75 dB
80 dB
200 mV
0.4 V
mW
%
dB
dB
dB
dB
MAX9775/MAX9776
2 x 1.5W, Stereo Class D Audio Subsystem with DirectDrive Headphone Amplifier
6 _______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS (continued)
(VDD= PVDD= CPVDD= 3.3V, V
GND
= V
PGND
= V
CPGND
= 0V, SHDN = VDD, I2C settings (INA gain = +20dB, INB gain = INC gain =
0dB, volume setting = 0dB, mono path gain = 0dB, SHDN = 1, SSM = 1). Speaker load resistors (R
LSP
) are terminated between
OUT_+ and OUT_-, headphone load resistors are terminated to GND, unless otherwise noted. C1 = C2 = C3 = 1µF. T
A
= T
MIN
to
T
MAX
, unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)
Note 1: All devices are 100% production tested at room temperature. All temperature limits are guaranteed by design. Note 2: Measured at headphone outputs. Note 3: Amplifier inputs AC-coupled to GND. Note 4: Testing performed with a resistive load in series with an inductor to simulate an actual speaker load. For R
L
= 8Ω, L = 68µH;
for R
L
= 4Ω, L = 47µH.
Note 5: MAX9775 only. Note 6: Testing performed at room temperature with an 8Ω resistive load in series with a 68µH inductive load connected across BTL
outputs for speaker amplifier. Testing performed with a 32Ω resistive load connected between OUT_ and GND for head­phone amplifier. Testing performed with 32Ω resistive load connected between OUTRx and GND for mono receiver amplifi­er. Mode transitions are controlled by I
2
C.
Note 7: Guaranteed by design.
SDA, SCL Input Capacitance C
Input Leakage Current I
Pulse Width of Spike Suppressed t
DIGITAL OUTPUTS (SDA Open Drain)
Output Low Voltage SDA V
Output Fall Time SDA t
I2C INTERFACE TIMING (Note 7)
Serial Clock Frequency f
Bus Free Time Between STOP and START Conditions
START Condition Hold t
STOP Condition Setup Time t
Clock Low Period t
Clock High Period t
Data Setup Time t
Data Hold Time t
Maximum Receive SCL/SDA Rise Time
Maximum Receive SCL/SDA Fall Time
Setup Time for STOP Condition t
Capacitive Load for Each Bus Line
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
HD:STA
SU:STA
SU:DAT
HD:DAT
SU:STO
IN
IN
SP
OL
OF
SCL
t
BUF
LOW
HIGH
t
R
t
F
C
b
I
= 6mA 0.4 V
SINK
V
H(MIN)
10pF to 400pF, I
10 pF
0.3 5.0 µA
50 ns
to V
bus capacitance =
L(MAX)
SINK
= 3mA
250 ns
DC 400 kHz
1.3 µs
0.6 µs
0.6 µs
1.3 µs
0.6 µs
100 ns
0 900 ns
0.6 µs
300 ns
300 ns
400 pF
MAX9775/MAX9776
2 x 1.5W, Stereo Class D Audio Subsystem
with DirectDrive Headphone Amplifier
_______________________________________________________________________________________
7
Typical Operating Characteristics
(VDD= PVDD= CPVDD= 3.3V, GND = PGND = CPGND = 0V, SHDN = VDD, I2C default gain settings (INA gain = +20dB, INB gain = INC gain = 0dB, volume setting = 0dB, mono path gain = 0dB, SHDN = 1, SSM = 1). Speaker load resistors (R
LSP
) are terminated
between OUT_+ and OUT_-, headphone load resistors are terminated to GND, unless otherwise stated. C1 = C2 = C3 = 1µF. T
A
=
+25°C, unless otherwise noted.)
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY
1
VDD = 5V
= 4Ω
R
L
P
= 400mW
0.1
THD+N (%)
0.01
0.001
OUT
P
= 1000mW
OUT
10 100k
FREQUENCY (Hz)
10k1k100
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY
1
VDD = 3.3V
= 8Ω
R
L
P
= 300mW
0.1
THD+N (%)
0.01
OUT
P
OUT
= 150mW
MAX9775/76 toc01
MAX9775/76 toc04
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY
1
VDD = 5V
= 8Ω
R
L
P
= 150mW
OUT
0.1
THD+N (%)
0.01
0.001 10 100k
P
= 750mW
OUT
FREQUENCY (Hz)
10k1k100
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY
1
VDD = 3.3V
= 8Ω
R
L
= 500mW
P
OUT
0.1
THD+N (%)
0.01
FFM
SSM
MAX9775/76 toc02
THD+N (%)
MAX9775/76 toc05
THD+N (%)
TOTAL HARMONIC DISTORTION PLUS NOISE
1
VDD = 3.3V
= 4Ω
R
L
P
= 400mW
OUT
0.1
0.01
0.001 10 100k
TOTAL HARMONIC DISTORTION PLUS NOISE
100
VDD = 5V
= 4Ω
R
L
10
1
0.1
0.01 f = 20Hz
vs. FREQUENCY
P
= 150mW
OUT
FREQUENCY (Hz)
vs. OUTPUT POWER
10k1k100
f = 1kHz
f = 10kHz
MAX9775/76 toc03
MAX9775/76 toc06
0.001 10 100k
FREQUENCY (Hz)
0.001
10k1k100
10 100k
FREQUENCY (Hz)
10k1k100
0.001 0 2.0
OUTPUT POWER (W)
1.61.20.80.4
MAX9775/MAX9776
2 x 1.5W, Stereo Class D Audio Subsystem with DirectDrive Headphone Amplifier
8 _______________________________________________________________________________________
Typical Operating Characteristics (continued)
(VDD= PVDD= CPVDD= 3.3V, GND = PGND = CPGND = 0V, SHDN = VDD, I2C default gain settings (INA gain = +20dB, INB gain = INC gain = 0dB, volume setting = 0dB, mono path gain = 0dB, SHDN = 1, SSM = 1). Speaker load resistors (R
LSP
) are terminated
between OUT_+ and OUT_-, headphone load resistors are terminated to GND, unless otherwise stated. C1 = C2 = C3 = 1µF. T
A
=
+25°C, unless otherwise noted.)
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER
MAX9775/76 toc07
OUTPUT POWER (W)
THD+N (%)
1.20.90.60.3
0.01
0.1
1
10
100
0.001 0 1.5
VDD = 5V R
L
= 8Ω
f = 10kHz
f = 20Hz
f = 1kHz
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER
MAX9775/76 toc08
OUTPUT POWER (W)
THD+N (%)
0.60.40.2
0.01
0.1
1
10
100
0.001 0 0.8
VDD = 3.3V R
L
= 4Ω
f = 10kHz
f = 20Hz
f = 1kHz
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER
MAX9775/76 toc09
OUTPUT POWER (W)
THD+N (%)
0.40.2
0.01
0.1
1
10
100
0.001 0 0.6
VDD = 3.3V R
L
= 8Ω
f = 10kHz
f = 20Hz
f = 1kHz
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER
MAX9775/76 toc10
OUTPUT POWER (W)
THD+N (%)
1.20.90.60.3
0.01
0.1
1
10
100
0.001 0 1.5
VDD = 5V R
L
= 8Ω
f = 1kHz
SSM
FFM
EFFICIENCY
vs. OUTPUT POWER
MAX9775/76 toc11
OUTPUT POWER (W)
EFFICIENCY (%)
3.22.41.60.8
10
20
30
40
50
60
70
80
90
100
0
0 4.0
VDD = 5V f
IN
= 1kHz
P
OUT
= P
OUTL
+ P
OUTR
RL = 8Ω
RL = 4Ω
EFFICIENCY
vs. OUTPUT POWER
MAX9775/76 toc12
OUTPUT POWER (W)
EFFICIENCY (%)
1.61.20.80.4
10
20
30
40
50
60
70
80
90
100
0
0 2.0
VDD = 3.3V f
IN
= 1kHz
P
OUT
= P
OUTL
+ P
OUTR
RL = 8Ω
RL = 4Ω
MAX9775/MAX9776
2 x 1.5W, Stereo Class D Audio Subsystem
with DirectDrive Headphone Amplifier
_______________________________________________________________________________________
9
Typical Operating Characteristics (continued)
(VDD= PVDD= CPVDD= 3.3V, GND = PGND = CPGND = 0V, SHDN = VDD, I2C default gain settings (INA gain = +20dB, INB gain = INC gain = 0dB, volume setting = 0dB, mono path gain = 0dB, SHDN = 1, SSM = 1). Speaker load resistors (R
LSP
) are terminated
between OUT_+ and OUT_-, headphone load resistors are terminated to GND, unless otherwise stated. C1 = C2 = C3 = 1µF. T
A
=
+25°C, unless otherwise noted.)
OUTPUT POWER
vs. SUPPLY VOLTAGE
2200
RL = 4Ω
2000
f = 1kHz
1800
1600
1400
1200
1000
800
OUTPUT POWER (mW)
600
400
200
0
2.7
THD+N = 10%
THD+N = 1%
SUPPLY VOLTAGE (V)
OUTPUT POWER
vs. LOAD
1000
V
= 3.3V
DD
f = 1kHz
800
THD+N = 10%
600
400
OUTPUT POWER (W)
200
THD+N = 1%
0
1 100
10
LOAD (Ω)
1600
RL = 8Ω f = 1kHz
1400
MAX9775/76 toc13
1200
1000
800
600
OUTPUT POWER (mW)
400
200
0
5.24.74.23.73.2
MAX9775/76 toc16
2.7
0
V
-10
V RL = 8Ω
-20
-30
-40
-50
-60
-70
-80
POWER-SUPPLY REJECTION RATIO (dB)
-90
-100 10 100k
OUTPUT POWER
vs. SUPPLY VOLTAGE
THD+N = 10%
THD+N = 1%
5.24.73.2 3.7 4.2
SUPPLY VOLTAGE (V)
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
= 3.3V
DD
= 100mV
IN
P-P
OUTR
OUTL
10k1k100
FREQUENCY (Hz)
MAX9775/76 toc14
OUTPUT POWER (W)
MAX9775/76 toc17
CROSSTALK (dB)
2.5 V
= 5V
DD
f = 1kHz
2.0
1.5
1.0
THD+N = 1%
0.5
0
1 100
CROSSTALK vs. FREQUENCY
0
OUT_ = 1V
-10 RL = 8Ω
-20
-30
-40
-50
-60
-70
-80
-90
-100
-110
-120 10 100 1k 10k 100k
LEFT TO RIGHT
OUTPUT POWER
vs. LOAD
THD+N = 10%
10
LOAD (Ω)
P-P
RIGHT TO LEFT
FREQUENCY (Hz)
MAX9775/76 toc15
MAX9775/6 toc18
MAX9775/MAX9776
2 x 1.5W, Stereo Class D Audio Subsystem with DirectDrive Headphone Amplifier
10 ______________________________________________________________________________________
Typical Operating Characteristics (continued)
(VDD= PVDD= CPVDD= 3.3V, GND = PGND = CPGND = 0V, SHDN = VDD, I2C default gain settings (INA gain = +20dB, INB gain = INC gain = 0dB, volume setting = 0dB, mono path gain = 0dB, SHDN = 1, SSM = 1). Speaker load resistors (R
LSP
) are terminated
between OUT_+ and OUT_-, headphone load resistors are terminated to GND, unless otherwise stated. C1 = C2 = C3 = 1µF. T
A
=
+25°C, unless otherwise noted.)
CROSSTALK vs. INPUT AMPLITUDE
INPUT AMPLITUDE (V
RMS
)
CROSSTALK (dB)
MAX9775/6 toc19
0 0.1 0.2 0.3 0.4 0.5 0.6
-120
-110
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
fIN = 1kHz R
L
= 8Ω
GAIN = +12dB
LEFT TO RIGHT
RIGHT TO LEFT
IN-BAND OUTPUT SPECTRUM
MAX9775/76 toc20
FREQUENCY (Hz)
OUTPUT MAGNITUDE (dBV)
15k10k5k
-120
-100
-80
-60
-40
-20
0
20
-140 0 20k
SSM MODE R
L
= 8Ω
V
DD
= 3.3V
f
IN
= 1kHz
UNWEIGHTED
IN-BAND OUTPUT SPECTRUM
MAX9775/76 toc21
FREQUENCY (Hz)
OUTPUT MAGNITUDE (dBV)
15k10k5k
-120
-100
-80
-60
-40
-20
0
20
-140 0 20k
FFM MODE R
L
= 8Ω
V
DD
= 3.3V
f
IN
= 1kHz
UNWEIGHTED
WIDEBAND OUTPUT SPECTRUM
FIXED-FREQUENCY MODE
FREQUENCY (MHz)
OUTPUT MAGNITUDE (dBV)
MAX9775/6 toc22
-140
-120
-100
-80
-60
-40
-20
0
20
0.1 1 10 100 1000
VDD = 5V R
L
= 8Ω
INPUTS AC GROUNDED
WIDEBAND OUTPUT SPECTRUM
SPREAD-SPECTRUM MODE
FREQUENCY (MHz)
OUTPUT MAGNITUDE (dBV)
MAX9775 toc23
-140
-120
-100
-80
-60
-40
-20
0
20
0.1 1 10 100 1000
VDD = 5V R
L
= 8Ω
INPUTS AC GROUNDED
MAX9775 SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX9775/76 toc24
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (mA)
5.24.74.23.73.2
15
20
25
10
2.7
SP MODE INPUTS AC GROUNDED OUTPUTS UNLOADED
MAX9775/MAX9776
2 x 1.5W, Stereo Class D Audio Subsystem
with DirectDrive Headphone Amplifier
______________________________________________________________________________________
11
Typical Operating Characteristics (continued)
(VDD= PVDD= CPVDD= 3.3V, GND = PGND = CPGND = 0V, SHDN = VDD, I2C default gain settings (INA gain = +20dB, INB gain = INC gain = 0dB, volume setting = 0dB, mono path gain = 0dB, SHDN = 1, SSM = 1). Speaker load resistors (R
LSP
) are terminated
between OUT_+ and OUT_-, headphone load resistors are terminated to GND, unless otherwise stated. C1 = C2 = C3 = 1µF. T
A
=
+25°C, unless otherwise noted.)
MAX9776 SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX9775/76 toc25
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (mA)
5.24.74.23.73.2
6
8
10
12
14
16
4
2.7
SP MODE INPUTS AC GROUNDED OUTPUTS UNLOADED
SHUTDOWN SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX9775/76 toc26
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (nA)
5.24.74.23.73.2
10
20
30
40
50
60
70
80
90
100
0
2.7
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY
MAX9775/76 toc27
FREQUENCY (Hz)
THD+N (%)
10k1k100
0.01
0.1
1
0.001 10 100k
V
DD
= 5V
R
L
= 32Ω
P
OUT
= 20mW
P
OUT
= 40mW
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY
MAX9775/76 toc28
FREQUENCY (Hz)
THD+N (%)
10k1k100
0.01
0.1
1
0.001 10 100k
V
DD
= 3.3V
R
L
= 16Ω
P
OUT
= 20mW
P
OUT
= 40mW
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY
MAX9775/76 toc29
FREQUENCY (Hz)
THD+N (%)
10k1k100
0.01
0.1
1
0.001 10 100k
V
DD
= 3.3V
R
L
= 32Ω
P
OUT
= 10mW
P
OUT
= 40mW
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER
MAX9775/76 toc30
OUTPUT POWER (mW)
THD+N (%)
604020
0.01
0.1
1
10
100
0.001 080
VDD = 5V R
L
= 32Ω
f = 10kHz
f = 20Hz
f = 1kHz
MAX9775/MAX9776
2 x 1.5W, Stereo Class D Audio Subsystem with DirectDrive Headphone Amplifier
12 ______________________________________________________________________________________
Typical Operating Characteristics (continued)
(VDD= PVDD= CPVDD= 3.3V, GND = PGND = CPGND = 0V, SHDN = VDD, I2C default gain settings (INA gain = +20dB, INB gain = INC gain = 0dB, volume setting = 0dB, mono path gain = 0dB, SHDN = 1, SSM = 1). Speaker load resistors (R
LSP
) are terminated
between OUT_+ and OUT_-, headphone load resistors are terminated to GND, unless otherwise stated. C1 = C2 = C3 = 1µF. T
A
=
+25°C, unless otherwise noted.)
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER
OUTPUT POWER (mW)
THD+N (%)
MAX9775 toc31
0 30 60 90 120
0.001
0.01
0.1
1
10
100
f = 20Hz
f = 1kHz
f = 10kHz
VDD = 3.3V R
L
= 16Ω
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER
MAX9775/76 toc32
OUTPUT POWER (mW)
THD+N (%)
604020
0.01
0.1
1
10
100
0.001 080
VDD = 3.3V R
L
= 32Ω
f = 10kHz
f = 20Hz
f = 1kHz
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. COMMON-MODE VOLTAGE
COMMON-MODE VOLTAGE (V)
THD+N (%)
MAX9775/6 toc33
0 0.5 1.0 1.5 2.0 2.5
0.001
0.01
0.1
1
10
100
VDD = 3.3V f
IN
= 1kHz
P
OUT
= 30mW GAIN = +3dB R
L
= 32Ω
POWER DISSIPATION
vs. OUTPUT POWER
MAX9775/76 toc34
TOTAL OUTPUT POWER (mW)
POWER DISSIPATION (mW)
8040
50
100
150
200
250
300
350
400
450
500
0
0 120
V
DD
= 5V f = 1kHz R
L
= 32Ω
P
OUT
= P
OUTR
+ P
OUTL
POWER DISSIPATION
vs. OUTPUT POWER
MAX9775/76 toc35
TOTAL OUTPUT POWER (mW)
POWER DISSIPATION (mW)
1208040
50
100
150
200
250
300
350
400
450
500
0
0 160
V
DD
= 3.3V f = 1kHz P
OUT
= P
OUTR
+ P
OUTL
RL = 16Ω
RL = 32Ω
OUTPUT POWER
vs. SUPPLY VOLTAGE
MAX9775/76 toc36
SUPPLY VOLTAGE (V)
OUTPUT POWER (mW)
5.24.74.23.73.2
35
40
45
50
55
60
65
30
2.7
THD+N = 10%
THD+N = 1%
RL = 32Ω f = 1kHz
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