19-0866; Rev 1; 1/08
IT
TION K
VALUA
E
BLE
AVAILA
2.3W, High-Power Class D Audio Subsystem
with DirectDrive Headphone Amplifiers
General Description
The MAX9796 combines a high-efficiency Class D, mono
audio power amplifier with a mono DirectDrive™ receiver
amplifier and a stereo DirectDrive headphone amplifier.
Maxim’s 3rd-generation, ultra-low EMI, Class D audio
power amplifiers provide Class AB performance with
Class D efficiency. The MAX9796 delivers 2.3W into a 4Ω
load from a 5V supply and offers efficiencies up to 80%.
Active emissions limiting circuitry and spread-spectrum
modulation greatly reduce EMI, eliminating the need for
output filtering found in traditional Class D devices.
The MAX9796 features a fully differential architecture, a
full-bridged output, and comprehensive click-and-pop
suppression. The device utilizes a flexible, user-defined
mixer architecture that includes an input mixer, volume
control, and output mixer. All controls are done through
an I
2
C interface.
The mono receiver amplifier and stereo headphone
amplifier use Maxim’s DirectDrive architecture, that pro-
duces a ground-referenced output from a single supply,
eliminating the need for large DC-blocking capacitors,
saving cost, space, and component height.
The MAX9796 is available in a 36-bump UCSP™ (3mm
x 3mm) package and is specified over the extended
-40°C to +85°C temperature range.
Features
♦
Unique Spread-Spectrum Modulation and Active
Emissions Limiting Significantly Reduces EMI
♦
Up to 3 Stereo Inputs
♦
2.3W Mono Speaker Output (4Ω, V
DD
= 5V)
♦
50mW Mono Receiver/Stereo Headphone Outputs
(32Ω, V
DD
= 3.3V)
♦
High PSRR (68dB at 217Hz)
♦
80% Efficiency (V
DD
= 3.3V, R
L
= 8Ω, P
OUT
=
600mW)
♦
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 UCSP
(3mm x 3mm)
MAX9796
Ordering Information
PART
MAX9796EBX+T
TEMP RANGE
PIN-
PACKAGE
PKG
CODE
B36-4
-40°C to +85°C 36 UCSP-36*
+Denotes
a lead-free package.
*Four center bumps depopulated.
Applications
Cell Phones
Portable Multimedia Players
Handheld Gaming Consoles
TOP VIEW
(BUMPS ON BOTTOM)
1
2
3
Pin Configuration
4
5
6
Simplified Block Diagram
A
CPV
DD
C1P
CPGND
C1N
CPV
SS
HPL
SINGLE SUPPLY 2.7V TO 5.5V
PV
DD
B
I.C.
VBIAS
INC1
V
SS
HPR
GAIN
CONTROL
OUT+
C
PGND
SDA
INC2
OUTRx
SCL
MAX9796
INB2
V
DD
MIXER/
MUX
I
2
C
INTERFACE
D
OUT-
E
PV
DD
F
OUT-
PGND
OUT+
PV
DD
GND
SHDN
INA1
INA2
INB1
I.C.
MAX9796
UCSP is a trademark of Maxim Integrated Products, Inc.
UCSP
________________________________________________________________
Maxim Integrated Products
1
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.
2.3W, High-Power Class D Audio Subsystem
with DirectDrive Headphone Amplifiers
MAX9796
ABSOLUTE MAXIMUM RATINGS
V
DD
to 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 (CPV
DD
+ 0.3V)
GND to PGND and CPGND................................................±0.3V
V
DD
to PV
DD
and CPV
DD
....................................................±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, CPV
DD
, 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
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
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(V
DD
= PV
DD
= CPV
DD
= 3.3V, GND = PGND = CPGND = 0V,
SHDN
= V
DD
, I
2
C 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 T
A
= +25°C.) (Note 1)
PARAMETER
GENERAL
Supply Voltage Range
V
DD
,
PV
DD
,
CPV
DD
Inferred from PSRR test
Output mode 1, 6, 11 (Rx mode)
Quiescent Current
I
DD
Output mode 4, 9, 14 (HP mode)
Output mode 2, 7, 12 (SP mode)
Output mode 3, 8, 13 (SP and HP modes)
Mute Current
Shutdown Current
I
MUTE
I
SHDN
Current in mute
Hard shutdown
Soft shutdown
SHDN
= GND
See the
I
2
C Interface
section
2.7
6.3
8
11.8
15.1
4.7
0.1
8.5
30
17.5
3.5
45
1.12
28
5.5
50
1.25
1.38
41.0
8.0
5.5
10
12.6
17.5
21
10
10
15
µA
mA
mA
V
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Turn-On Time
t
ON
Time from shutdown or power-on to full
operation
B and C pair inputs, T
A
= +25°C,
VOL = max
A pair inputs, T
A
= +25°C, +20dB
T
A
= +25°C, V
IN
= ±500mV
IN_ inputs
ms
kΩ
kΩ
dB
V
Input Resistance
Common-Mode Rejection Ratio
Input DC Bias Voltage
R
IN
CMRR
V
BIAS
2
_______________________________________________________________________________________
2.3W, High-Power Class D Audio Subsystem
with DirectDrive Headphone Amplifiers
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= PV
DD
= CPV
DD
= 3.3V, GND = PGND = CPGND = 0V,
SHDN
= V
DD
, I
2
C 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 T
A
= +25°C.) (Note 1)
PARAMETER
SPEAKER AMPLIFIER
Output Offset Voltage
V
OS
T
A
= +25°C
T
MIN
≤
T
A
≤
T
MAX
Peak voltage, T
A
=
+25°C, A-weighted,
32 samples per
second (Notes 3, 4)
Into shutdown
Out of shutdown
Into mute
Out of mute
V
DD
= 2.7V to 5.5V
f = 217Hz, 100mV
P-P
ripple
Power-Supply Rejection Ratio
(Note 3)
PSRR
T
A
= +25°C
f = 1kHz, 100mV
P-P
ripple
f = 20kHz, 100mV
P-P
ripple
R
L
= 4Ω, V
DD
= 5V,
f = 1kHz
Output Power (Note 4)
P
OUT
THD+N = 1%,
T
A
= +25°C
R
L
= 8Ω, V
DD
= 3.3V,
f = 1kHz
R
L
= 8Ω, V
DD
= 5V,
f = 1kHz
Current Limit
Total Harmonic Distortion Plus
Noise (Note 4)
R
L
= 8Ω,
P
OUT
= 800mW
R
L
= 4Ω,
P
OUT
= 830mW
SNR
V
OUT
= 1.8V
RMS
,
R
L
= 8Ω (Note 3)
BW = 20Hz to 20kHz
A-weighted
48
-62
-60
-63
-62
70
68
60
50
2300
600
1300
1.6
0.03
%
0.04
81
84
1100
1100
±30
80
12
kHz
A
mW
dB
dB
±5.5
±23.5
±40
mV
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MAX9796
Click-and-Pop Level
K
CP
THD+N
f = 1kHz
Signal-to-Noise Ratio
dB
Fixed-frequency modulation (SSM = 0)
Output Frequency
f
OSC
Spread-spectrum modulation (SSM = 1)
P
OUT
= 470mW, f = 1kHz both channel
driven, L = 68µH in series with 8Ω load
Efficiency
Gain
η
A
V
%
dB
_______________________________________________________________________________________
3
2.3W, High-Power Class D Audio Subsystem
with DirectDrive Headphone Amplifiers
MAX9796
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= PV
DD
= CPV
DD
= 3.3V, GND = PGND = CPGND = 0V,
SHDN
= V
DD
, I
2
C 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 T
A
= +25°C.) (Note 1)
PARAMETER
RECEIVER AMPLIFIER
Output Offset Voltage
V
OS
T
A
= +25°C
Peak voltage, T
A
=
+25°C, A-weighted,
32 samples per
second (Notes 3, 5)
Into shutdown
Into mute
Out of shutdown
Out of mute
V
DD
= 2.7V to 5.5V
f = 217Hz, 100mV
P-P
ripple
Power-Supply Rejection Ratio
(Note 3)
PSRR
T
A
= +25°C
f = 1kHz, 100mV
P-P
ripple
f = 20kHz, 100mV
P-P
ripple
Output Power
Gain
Total Harmonic Distortion Plus
Noise
Signal-to-Noise Ratio
Slew Rate
Capacitive Drive
HEADPHONE AMPLIFIERS
Output Offset Voltage
V
OS
T
A
= +25°C
Peak voltage, T
A
=
+25°C, A-weighted,
32 samples per
second (Notes 2, 5)
HP_
Into shutdown
Into mute
Out of shutdown
Out of mute
Contact
Air
V
DD
= 2.7V to 5.5V
f = 217Hz, 100mV
P-P
ripple
Power-Supply Rejection Ratio
(Note 3)
PSRR
T
A
= +25°C
f = 1kHz, 100mV
P-P
ripple
f = 20kHz, 100mV
P-P
ripple
58
±1.8
-61
-65
-60
-64
±4
±8
80
80
70
62
dB
kV
dB
mV
P
OUT
A
V
THD+N
SNR
SR
C
L
R
L
= 16Ω (V
OUT
= 800mV
RMS
, f = 1kHz)
R
L
= 32Ω (V
OUT
= 800mV
RMS
, f = 1kHz)
R
L
= 16Ω, V
OUT
=
800mV
RMS
(Note 3)
BW = 20Hz to 20kHz
A-weighted
T
A
= +25°C,
THD+N = 1%
R
L
= 16Ω
R
L
= 32Ω
58
±1.8
-62
-67
-63
-66
80
80
70
62
60
50
3
0.03
0.024
87
89
0.3
300
mW
dB
%
dB
V/µs
pF
dB
dB
mV
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Click-and-Pop Level
K
CP
Click-and-Pop Level
K
CP
ESD Protection
4
_______________________________________________________________________________________
2.3W, High-Power Class D Audio Subsystem
with DirectDrive Headphone Amplifiers
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= PV
DD
= CPV
DD
= 3.3V, GND = PGND = CPGND = 0V,
SHDN
= V
DD
, I
2
C 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 T
A
= +25°C.) (Note 1)
PARAMETER
Output Power
Current Limit
Gain
Channel-to-Channel Gain
Tracking
Total Harmonic Distortion Plus
Noise
Signal-to-Noise Ratio
Slew Rate
Capacitive Drive
Crosstalk
VOLUME CONTROL
HP gain (max)
IN+6dB = 0
(minimum gain
setting)
Volume Control
IN+6dB = 1
(maximum gain
setting)
SP gain (max)
HP gain (min)
SP gain (min)
HP gain (max)
SP gain (max)
HP gain (min)
SP gain (min)
Mono Gain
Input Pair A Control
Mute Attenuation (Minimum
Volume)
DIGITAL INPUTS (SHDN, SDA, SCL)
Input-Voltage High
Input-Voltage Low
Input Hysteresis (SDA, SCL)
SDA, SCL Input Capacitance
Input Leakage Current
Pulse Width of Spike Suppressed
V
IH
V
IL
V
HYS
C
IN
I
IN
t
SP
50
200
10
1.0
1.4
0.4
V
V
mV
pF
µA
ns
All outputs
Mono + 6dB = 0
Mono + 6dB = 1
3
12
-72
-63
9
18
-61
-57
0
6
Set by IN+6dB
20
80
dB
dB
dB
dB
THD+N
SNR
SR
C
L
L to R, R to L, f = 10kHz, R
L
= 16Ω,
V
OUT
= 160mV
RMS
A
V
T
A
= +25°C
R
L
= 16Ω (V
OUT
= 800mV
RMS
, f = 1kHz)
R
L
= 32Ω (V
OUT
= 800mV
RMS
, f = 1kHz)
R
L
= 16Ω, V
OUT
=
800mV
RMS
BW = 20Hz to 20kHz
A-weighted
SYMBOL
P
OUT
T
A
= +25°C,
THD+N = 1%
CONDITIONS
R
L
= 16Ω
R
L
= 32Ω
MIN
TYP
60
50
170
+3
±1
0.03
0.024
92
93
0.3
300
75
MAX
UNITS
mW
mA
dB
%
%
dB
V/µs
pF
dB
MAX9796
INA+20dB = 0 (minimum gain setting)
INA+20dB = 1 (maximum gain setting)
V
IN
= 1V
RMS
_______________________________________________________________________________________
5
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