Rainbow Electronics MAX9796 User Manual
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 patented†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 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.
Applications
Cell Phones
Portable Multimedia Players
Handheld Gaming Consoles
Features
o Unique Spread-Spectrum Modulation and Active
Emissions Limiting Significantly Reduces EMI
o Up to 3 Stereo Inputs
o 2.3W Mono Speaker Output (4Ω, VDD= 5V)
o 50mW Mono Receiver/Stereo Headphone Outputs
(32Ω, VDD= 3.3V)
o High PSRR (68dB at 217Hz)
o 80% Efficiency (V
DD
= 3.3V, RL= 8Ω, P
OUT
=
600mW)
o I
2
C Control—Input Configuration, Volume
Control, Output Mode
o Click-and-Pop Suppression
o Low Total Harmonic Distortion (0.03% at 1kHz)
o Current-Limit and Thermal Protection
o Available in Space-Saving, 36-Bump UCSP
(3mm x 3mm)
MAX9796
2.3W, High-Power Class D Audio Subsystem
with DirectDrive Headphone Amplifiers
________________________________________________________________
Maxim Integrated Products
1
Ordering Information
MAX9796
MIXER/
MUX
GAIN
CONTROL
I2C
INTERFACE
SINGLE SUPPLY 2.7V TO 5.5V
PART
TEMP RANGE
PINPACKAGE
PKG
CODE
MAX9796EBX+T
B36-4
Simplified Block Diagram
MAX9796
C1P CPGND
C1N
CPV
DD
1
A
B
C
D
234
OUT+
SDA
PGND SCL
UCSP
E
F
PV
DD
OUT- PGND OUT+
CPV
SS
HPL
I.C. VBIAS
INC1
PV
DD
V
SS
HPR
56
INC2 OUTRx
INB2 V
DD
PV
DD
GND
OUT- SHDN INA1 INA2 INB1 I.C.
TOP VIEW
(BUMPS ON BOTTOM)
Pin Configuration
19-0866; Rev 0; 7/07
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.
UCSP is a trademark of Maxim Integrated Products, Inc.
+
Denotes a lead-free package.
*Four center bumps depopulated.
†
U.S. Patent # 7,061,327
-40°C to +85°C 36 UCSP-36*
MAX9796
2.3W, High-Power Class D Audio Subsystem
with DirectDrive Headphone Amplifiers
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(VDD= PVDD= CPVDD= 3.3V, GND = PGND = 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 T
A
= +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
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 I
Mute Current I
Shutdown Current I
Turn-On Time t
Input Resistance R
Common-Mode Rejection Ratio CMRR TA = +25°C, VIN = ±500mV 45 50 dB
Input DC Bias Voltage V
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
PV
CPV
,
V
DD
,
DD
DD
DD
MUTE
SHDN
ON
IN
BIAS
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) 11.8 17.5
Output mode 3, 8, 13 (SP and HP modes) 15.1 21
Current in mute 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
8.5 15
30 ms
17.5 28 41.0 kΩ
mA
µA
MAX9796
2.3W, High-Power Class D Audio Subsystem
with DirectDrive Headphone Amplifiers
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(VDD= PVDD= CPVDD= 3.3V, GND = PGND = 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 T
A
= +25°C.) (Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
SPEAKER AMPLIFIER
Output Offset Voltage V
Click-and-Pop Level K
Power-Supply Rejection Ratio
(Note 3)
Output Power (Note 4) P
Current Limit 1.6 A
Total Harmonic Distortion Plus
Noise (Note 4)
PSRR T
THD+N f = 1kHz
OS
CP
OUT
TA = +25°C ±5.5 ±23.5
T
MIN
Peak voltage, TA =
+25°C, A-weighted,
32 samples per
second (Notes 3, 4)
A
THD+N = 1%,
T
A
≤ TA ≤ T
= +25°C
= +25°C
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, 100mV
ripple
f = 1kHz, 100mV
ripple
f = 20kHz, 100mV
ripple
RL = 4Ω, VDD = 5V,
f = 1kHz
RL = 8Ω, VDD = 3.3V,
f = 1kHz
= 8Ω, VDD = 5V,
R
L
f = 1kHz
RL = 8Ω,
P
= 800mW
OUT
R
= 4Ω,
L
P
= 830mW
OUT
P-P
P-P
P-P
68
60
50
2300
600
1300
0.03
0.04
±40
mV
dB
dB
mW
%
Signal-to-Noise Ratio SNR
Output Frequency f
Efficiency η
Gain A
OSC
= 1.8V
V
OUT
= 8Ω (Note 3)
R
L
Fixed-frequency modulation (SSM = 0) 1100
Spread-spectrum modulation (SSM = 1)
P
OUT
driven, L = 68µH in series with 8Ω load
V
RMS
= 470mW, f = 1kHz both channel
BW = 20Hz to 20kHz 81
,
A-weighted 84
1100
±30
80 %
12 dB
dB
kHz
MAX9796
2.3W, High-Power Class D Audio Subsystem
with DirectDrive Headphone Amplifiers
4 _______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS (continued)
(VDD= PVDD= CPVDD= 3.3V, GND = PGND = 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 T
A
= +25°C.) (Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
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)
THD+N
OS
CP
PSRR T
OUT
V
L
OS
CP
PSRR T
TA = +25°C ±1.8 mV
Peak voltage, TA =
+25°C, A-weighted,
32 samples per
second (Notes 3, 5)
= +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 mV
Peak voltage, TA =
+25°C, A-weighted,
32 samples per
second (Notes 2, 5)
= +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
ripple
f = 1kHz, 100mV
ripple
f = 20kHz, 100mV
ripple
RL = 16Ω 60
R
= 32Ω 50
L
= 800mV
= 800mV
=
, f = 1kHz) 0.03
RMS
, f = 1kHz) 0.024
RMS
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
ripple
f = 1kHz, 100mV
ripple
f = 20kHz, 100mV
ripple
P-P
P-P
P-P
P-P
P-P
P-P
80
70
62
300 pF
80
70
62
3dB
dB
dB
mW
%
dB
dB
kV
dB
MAX9796
2.3W, High-Power Class D Audio Subsystem
with DirectDrive Headphone Amplifiers
_______________________________________________________________________________________ 5
ELECTRICAL CHARACTERISTICS (continued)
(VDD= PVDD= CPVDD= 3.3V, GND = PGND = 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 T
A
= +25°C.) (Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
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
SDA, SCL Input Capacitance C
Input Leakage Current I
Pulse Width of Spike Suppressed t
THD+N
OUT
HYS
IN
SP
TA = +25°C,
THD+N = 1%
V
T
RL = 16Ω (V
R
R
800mV
L
L to R, R to L, f = 10kHz, R
V
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
IH
IL
IN
RL = 16Ω 60
= 32Ω 50
R
L
= +25°C ±1 %
A
= 800mV
OUT
= 32Ω (V
L
= 16Ω, V
L
RMS A-weighted 93
= 160mV
OUT
= 1V
IN
RMS
OUT
OUT
RMS
= 800mV
=
, f = 1kHz) 0.03
RMS
, f = 1kHz) 0.024
RMS
BW = 20Hz to 20kHz 92
= 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
300 pF
75 dB
80 dB
200 mV
10 pF
50 ns
0.4 V
1.0 µA
mW
%
dB
dB
dB
dB
MAX9796
2.3W, High-Power Class D Audio Subsystem
with DirectDrive Headphone Amplifiers
6 _______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS (continued)
(VDD= PVDD= CPVDD= 3.3V, GND = PGND = 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 T
A
= +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,
R
L
= 4Ω L = 47µH.
Note 5: Testing performed at room temperature with an 8Ω resistive load in series with 68µH inductive load connected across BTL
outputs for speaker amplifier. Testing performed with 32Ω resistive load connected between OUT_ and GND for headphone
amplifier. Testing performed with a 32Ω resistive load connected between OUTRx and GND for mono receiver amplifier.
Mode transitions are controlled by SHDN pin.
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
DIGITAL OUTPUTS (SDA Open Drain)
Output Low Voltage SDA V
Output Fall Time SDA t
I2C INTERFACE TIMING
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
HD:STA
SU:STA
SU:DAT
HD:DAT
SU:STO
OL
OF
SCL
t
BUF
LOW
HIGH
t
R
t
F
C
b
I
= 6mA 0.4 V
SINK
V
to V
H(MIN)
to 400pF, I
bus capacitance = 10pF
L(MAX)
= 3mA
SINK
DC 400 kHz
1.3 µs
0.6 µs
0.6 µs
1.3 µs
0.6 µs
100 ns
0.6 µs
250 ns
0 900 ns
300 ns
300 ns
400 pF
MAX9796
2.3W, High-Power Class D Audio Subsystem
with DirectDrive Headphone Amplifiers
_______________________________________________________________________________________
7
Typical Operating Characteristics
(VDD= PVDD= CPVDD= 3.3V, GND = PGND = 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). C1 = C2 = C3 = 1µF. Speaker load resistors (R
LSP
) are ter-
minated between OUT+ and OUT-, headphone load resistors are terminated to GND, unless otherwise noted.)
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. FREQUENCY
1
P
= 1W
OUT
0.1
THD+N (%)
0.01
0.001
10 100k
P
= 1.6W
OUT
FREQUENCY (Hz)
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. FREQUENCY
1
VDD = 3.3V
Ω
= 8
R
L
P
= 200mW
0.1
THD+N (%)
0.01
OUT
P
OUT
= 450mW
VDD = 5V
R
10k1k100
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. FREQUENCY
1
VDD = 5V
Ω
= 8
R
MAX9796 toc01
Ω
= 4
L
L
P
= 500mW
0.1
THD+N (%)
0.01
0.001
OUT
P
= 750mW
OUT
10 100k
FREQUENCY (Hz)
MAX9796 toc02
10k1k100
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. FREQUENCY
1
VDD = 5V
Ω
= 8
R
0.1
THD+N (%)
0.01
L
P
OUT
= 500mW
MAX9796 toc05
SSM
FFM
MAX9796 toc04
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. FREQUENCY
1
VDD = 3.3V
Ω
= 4
R
L
P
= 350mW
0.1
THD+N (%)
0.01
0.001
OUT
P
= 800mW
OUT
10 100k
FREQUENCY (Hz)
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. OUTPUT POWER
100
VDD = 5V
Ω
= 4
R
L
10
1
10kHz
THD+N (%)
0.1
0.01
20Hz
10k1k100
1kHz
MAX9796 toc03
MAX9796 toc06
0.001
10 100k
FREQUENCY (Hz)
10k1k100
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. OUTPUT POWER
100
VDD = 5V
Ω
= 8
R
L
10
1
10kHz
THD+N (%)
0.1
20Hz
0.01
0.001
01.8
OUTPUT POWER (W)
1kHz
1.51.20.90.60.3
MAX9796 toc07
0.001
10 100k
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. OUTPUT POWER
100
VDD = 3.3V
Ω
= 4
R
L
10
1
10kHz
THD+N (%)
0.1
0.01
0.001
0 1.2
FREQUENCY (Hz)
1kHz
OUTPUT POWER (W)
10k1k100
20Hz
0.001
03.0
OUTPUT POWER (W)
2.41.81.20.6
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. OUTPUT POWER
100
VDD = 3.3V
Ω
= 8
R
MAX9796 toc08
1.00.80.60.40.2
L
10
1
10kHz
THD+N (%)
0.1
0.01
0.001
00.8
OUTPUT POWER (W)
20Hz
1kHz
0.60.40.2
MAX9796 toc09
MAX9796
2.3W, High-Power Class D Audio Subsystem
with DirectDrive Headphone Amplifiers
8 _______________________________________________________________________________________
Typical Operating Characteristics (continued)
(VDD= PVDD= CPVDD= 3.3V, GND = PGND = 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). C1 = C2 = C3 = 1µF. Speaker load resistors (R
LSP
) are ter-
minated between OUT+ and OUT-, headphone load resistors are terminated to GND, unless otherwise noted.)
100
90
RL = 8
80
70
60
50
40
EFFICIENCY (%)
30
20
10
0
03
2.0
RL = 8
1.8
f = 1kHz
1.6
1.4
1.2
1.0
0.8
OUTPUT POWER (W)
0.6
0.4
0.2
0
2.5 5.5
EFFICIENCY
vs. OUTPUT POWER
Ω
Ω
RL = 4
OUTPUT POWER (W)
OUTPUT POWER
vs. SUPPLY VOLTAGE
Ω
THD+N = 10%
THD+N = 1%
SUPPLY VOLTAGE (V)
21
VDD = 5V
f = 1kHz
5.04.54.03.53.0
MAX9796 toc10
EFFICIENCY (%)
MAX9796 toc13
OUTPUT POWER (W)
EFFICIENCY
vs. OUTPUT POWER
100
90
80
70
60
50
40
30
20
10
0
Ω
RL = 8
Ω
RL = 4
0 2.0
OUTPUT POWER (W)
1.51.00.5
OUTPUT POWER
VDD = 3.3V
f = 1kHz
MAX9796 toc11
OUTPUT POWER (W)
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
2.5 5.5
OUTPUT POWER
vs. SUPPLY VOLTAGE
Ω
RL = 4
f = 1kHz
THD+N = 10%
SUPPLY VOLTAGE (V)
OUTPUT POWER
vs. LOAD
MAX9796 toc14
OUTPUT POWER (W)
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
THD+N = 1%
0
1 100
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
THD+N = 1%
0
1100
THD+N = 10%
10
LOAD (Ω)
VDD = 5V
f = 1kHz
THD+N = 1%
vs. LOAD
THD+N = 10%
10
LOAD (Ω)
VDD = 3.3V
f = 1kHz
MAX9796 toc12
5.04.53.0 3.5 4.0
MAX9796 toc15
POWER-SUPPLY REJECTION RATIO
0
vs. FREQUENCY
VDD = 3.3V
-10
-20
-30
-40
-50
-60
PSRR (dB)
-70
-80
-90
-100
-110
-120
= 100mV
V
RIPPLE
RL = 8
10 100k
Ω
P-P
FREQUENCY (Hz)
INBAND OUTPUT SPECTRUM
20
FIXED-FREQUENCY MODULATION MODE
Ω
= 8
R
0
MAX9796 toc16
OUTPUT MAGNITUDE (dBV)
10k1k100
L
V
= 5V
DD
-20
f = 1kHz
UNWEIGHTED
-40
-60
-80
-100
-120
-140
= -60dBV
V
OUT
020k
FREQUENCY (Hz)
15k10k5k
MAX9796 toc17
-20
-40
-60
-80
OUTPUT MAGNITUDE (dBV)
-100
-120
-140
INBAND OUTPUT SPECTRUM
20
FIXED-FREQUENCY MODULATION MODE
0
Ω
= 8
R
L
V
= 5V
DD
f = 1kHz
A-WEIGHTED
= -60dBV
V
OUT
020k
FREQUENCY (Hz)
MAX9796 toc18
15k10k5k
MAX9796
2.3W, High-Power Class D Audio Subsystem
with DirectDrive Headphone Amplifiers
_______________________________________________________________________________________
9
Typical Operating Characteristics (continued)
(VDD= PVDD= CPVDD= 3.3V, GND = PGND = 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). C1 = C2 = C3 = 1µF. Speaker load resistors (R
LSP
) are ter-
minated between OUT+ and OUT-, headphone load resistors are terminated to GND, unless otherwise noted.)
WIDEBAND OUTPUT SPECTRUM
INBAND OUTPUT SPECTRUM
20
SPREAD-SPECTRUM MODULATION MODE
0
-20
-40
-60
-80
OUTPUT MAGNITUDE (dBV)
-100
-120
-140
Ω
= 8
R
L
= 5V
V
DD
f = 1kHz
UNWEIGHTED
= -60dBV
V
OUT
020k
FREQUENCY (Hz)
15k10k5k
MAX9796 toc19
-20
-40
-60
-80
OUTPUT MAGNITUDE (dBV)
-100
-120
-140
INBAND OUTPUT SPECTRUM
20
SPREAD-SPECTRUM MODULATION MODE
0
Ω
= 8
R
L
= 5V
V
DD
f = 1kHz
A-WEIGHTED
= -60dBV
V
OUT
020k
FREQUENCY (Hz)
15k10k5k
20
MAX9796 toc20
-20
-40
-60
-80
OUTPUT MAGNITUDE (dBV)
-100
-120
-140
FIXED-FREQUENCY MODE
0
VDD = 5V
Ω
= 8
R
L
INPUTS AC GROUNDED
0.1 1000
FREQUENCY (MHz)
WIDEBAND OUTPUT SPECTRUM
20
0
-20
-40
-60
-80
OUTPUT MAGNITUDE (dBV)
-100
VDD = 5V
Ω
= 8
R
-120
L
INPUTS AC GROUNDED
-140
0.1 1000
FREQUENCY (MHz)
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
16
INPUTS AC GROUNDED
14
12
SUPPLY CURRENT (mA)
10
SPREAD-SPECTRUM MODE
TURN-ON RESPONSE
MAX9796 toc22
100101
10ms/div
SHUTDOWN CURRENT
MAX9796 toc23
SCL
2V/div
SPEAKER
OUTPUT
200mA/div
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. SUPPLY VOLTAGE
MAX9796 toc25
0.25
0.20
0.15
0.10
SHUTDOWN CURRENT (µA)
0.05
INPUTS AC GROUNDED
MAX9796 toc26
1
0.1
THD+N (%)
0.01
TURN-OFF RESPONSE
vs. FREQUENCY
V
= 5V
DD
= 32Ω
R
L
P
= 20mW
OUT
P
OUT
10ms/div
= 40mW
100101
MAX9796 toc24
MAX9796 toc21
SCL
2V/div
SPEAKER
OUTPUT
200mA/div
MAX9796 toc27
8
2.5 5.5
SUPPLY VOLTAGE (V)
5.04.54.03.53.0
8
2.5 5.5
SUPPLY VOLTAGE (V)
5.04.54.03.53.0
0.001
10 100k
FREQUENCY (Hz)
10k1k100
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