MAXIM MAX9875 Technical data
General Description
The MAX9875 combines a high-efficiency Class D
audio power amplifier with a stereo Class AB capacitorless DirectDrive
®
headphone amplifier. Maxim’s 3rd
generation, filterless Class D amplifier with active emissions limiting technology provides Class AB performance with Class D efficiency.
The MAX9875 delivers up to 725mW from a 3.7V supply
into an 8Ω load with 87% efficiency to extend battery life.
The filterless modulation scheme combined with active
emissions limiting circuitry and spread-spectrum modulation greatly reduces EMI while eliminating the need for
output filtering used in traditional Class D devices.
The stereo Class AB headphone amplifier in the
MAX9875 uses 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 device utilizes a user-defined input architecture,
three preamplifier gain settings, an input mixer, volume
control, comprehensive click-and-pop suppression, and
I
2
C control.
The MAX9875 is available in a thermally efficient,
space-saving 20-bump WLP package.
Applications
Cell Phones
Portable Multimedia Players
Features
♦ Low Emissions, Filterless Class D Amplifier
Achieves Better than 10dB Margin Under EN55022
Class B Limits
♦ Low RF Susceptibility Design Rejects TDMA
Noise from GSM Radios
♦ Input Mixer with User-Defined Input Mode
♦ 725mW Speaker Output (R
SPK
= 8Ω, PVDD = 3.7V)
♦ 53mW Headphone Output (R
HP
= 16Ω, VDD= 3.7V)
♦ Low 0.05% THD+N at 1kHz (Class D Power
Amplifier)
♦ Low 0.016% THD+N at 1kHz (Headphone
Amplifier)
♦ 87% Efficiency (R
SPK
= 8Ω, P
OUT
= 750mW)
♦ High Speaker Amplifier PSRR (72dB at 217Hz)
♦ High Headphone Amplifier PSRR (84dB at 217Hz)
♦ I
2
C Control
♦ Hardware and Software Shutdown Mode
♦ Click-and-Pop Suppression
♦ Current-Limit and Thermal Protection
♦ Available in a Space-Saving, 2.5mm x 2.0mm WLP
Package
MAX9875
Low RF Susceptibility, Mono Audio
Subsystem with DirectDrive Headphone Amplifier
________________________________________________________________
Maxim Integrated Products
1
Simplified Block Diagram
WLP
HPL V
SS
C1N
HPR
1
A
B
C
D
2
3
4
C1P
BIAS SDA
N.C.
V
DD
OUT+
INB1 SCL
PGND
INB2
PVDD
INA1 GND
N.C.
INA2
OUT-
5
TOP VIEW
(BUMP SIDE DOWN)
Pin Configuration
19-4536; Rev 0; 3/09
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.
EVALUATION KIT
AVAILABLE
Ordering Information
PART
PIN - PA C K A G E
MAX9875ERP+TG45
20 WLP (5x4)
+
Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
G45 indicates protective die coating.
DirectDrive is a registered trademark of Maxim Integrated
Products, Inc.
TEMP RANGE
-40°C to +85°C
PREAMPLIFIER
I2C
INTERFACE
SINGLE SUPPLY
2.7V TO 5.25V
VOLUME
CONTROL
MIXER/MUX
VOLUME
CONTROL
MAX9875
MAX9875
Low RF Susceptibility, Mono Audio
Subsystem with DirectDrive Headphone Amplifier
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(VDD= V
PVDD
= 3.7V, V
GND
= V
PGND
= 0V. Single-ended inputs, preamp gain = 0dB, volume controls = 0dB, OSC = 00, SHDN = 1.
Speaker loads (Z
SPK
) connected between OUT+ and OUT-. Headphone loads (RHP) connected from HPL or HPR to GND. SDA and
SCL pullup voltage = 3.3V. Z
SPK
= ∞, RHP= ∞. C1 = C2 = C
BIAS
= 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.
Note 1: HPR and HPL should be limited to no more than 9V above VSS, or above PVDD + 0.3V, whichever limits first.
Note 2: HPR and HPL should be limited to no more than 9V below PVDD, or below V
SS
- 0.3V, whichever limits first.
V
DD
, PVDD to PGND .............................................-0.3V to +5.5V
V
DD
to PVDD .........................................................-0.3V to +0.3V
V
SS
to PGND .........................................................-5.5V to +0.3V
C1N to PGND..............................................(V
SS
- 0.3V) to +0.3V
C1P to PGND...........................................-0.3V to (PVDD + 0.3V)
HPL, HPR to V
SS
(Note 1)......-0.3V to the lower of (PVDD - (VSS+ 0.3V)) or +9V
HPL, HPR to PVDD
(Note 2) .....+0.3V to the higher of (V
SS
- (PVDD - 0.3V)) or -9V
GND to PGND.....................................................................±0.3V
INA1, INA2, INB1, INB2, BIAS..................................-0.3V to +4V
SDA, SCL...............................................................-0.3V to +5.5V
All Other Pins to GND..............................-0.3V to (PVDD + 0.3V)
Continuous Current In/Out of PVDD, PGND, OUT_........±800mA
Continuous Current In/Out of HPR and HPL .....................140mA
Continuous Input Current V
SS
...........................................100mA
Continuous Input Current (all other pins) .........................±20mA
Duration of OUT_ Short Circuit to GND or PVDD .......Continuous
Duration of Short Circuit Between OUT+ and OUT- ..Continuous
Duration of HP_ Short Circuit to GND or PVDD..........Continuous
Continuous Power Dissipation (T
A
= +70°C)
20-Bump WLP, 5 x 4, Multilayer Board
(derate 13.0mW/°C above +70°C)..................................1.04W
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
Supply Voltage Range VDD, PVDD Guaranteed by PSRR test 2.7 5.25 V
Quiescent Current I
Shutdown Current I
Turn-On Time t
BIAS Release Time t
Input Resistance R
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
DD
SHDN
ON
BR
IN
HP mode,
OUTMODE = 2
SPK mode,
OUTMODE = 7
SPK + HP mode,
OUTMODE = 9
I
= I
SHDN
V
Time from shutdown to
full operation
After forcing BIAS low, time from BIAS
released to I
TA = +25°C, preamp gain = 0dB or +9dB 11 21 31
TA = +25°C, preamp gain = +20dB 3 5.5 8
Preamp = 0dB 2.30
Preamp = +9dB 0.820Maximum Input Signal Swing
Preamp = +20dB 0.230
VDD
= logic-high; TA = +25°C
SCL
+ I
2
C reset
; SHDN = 0; V
PVDD
OSC = 00 5.6 9.0
OSC = 10 5.5
OSC = 00 6.6 11.0
OSC = 10 5.7
OSC = 00 10.4 16.0
OSC = 10 9.3
OSC = 00 10
OSC = 01 10
OSC = 10 17.5
=
SDA
10 22 µA
25 80 ms
mA
ms
V
kΩ
P-P
MAX9875
Low RF Susceptibility, Mono Audio
Subsystem with DirectDrive Headphone Amplifier
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(VDD= V
PVDD
= 3.7V, V
GND
= V
PGND
= 0V. Single-ended inputs, preamp gain = 0dB, volume controls = 0dB, OSC = 00, SHDN = 1.
Speaker loads (Z
SPK
) connected between OUT+ and OUT-. Headphone loads (RHP) connected from HPL or HPR to GND. SDA and
SCL pullup voltage = 3.3V. Z
SPK
= ∞, RHP= ∞. C1 = C2 = C
BIAS
= 1µF. TA= T
MIN
to T
MAX
, unless otherwise noted. Typical values are
at T
A
= +25°C.) (Note 3)
Common-Mode Rejection Ratio CMRR
Input DC Voltage IN__ inputs 1.22 1.3 1.38 V
Bias Voltage V
SPEAKER AMPLIFIER (OUTMODE = 1)
Output Offset Voltage V
Click-and-Pop Level K
Power-Supply Rejection Ratio
(Note 4)
Output Power (Note 5) P
Total Harmonic Distortion Plus
Noise
Signal-to-Noise Ratio SNR
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
BIAS
OS
CP
PSRR
OUT
THD+N
f
= 1kHz (differential
IN
input mode)
TA = +25°C (volume at mute) ±0.5 ±4
TA = +25°C (volume at 0dB,
OUTMODE = 1, ∆IN_ = 0)
Peak voltage, TA =
+25°C, A-weighted, 32
samples per second,
volume at mute (Note 4)
T
= +25°C, PVDD =
A
V
DD
THD+N ≤ 1%
f = 1kHz, P
Z
= 8Ω + 68µH
SPK
A-weighted,
OUTMODE = 1, 3,
4, 6
A-weighted,
OUTMODE = 7, 9
= 350mW, TA = +25°C,
OUT
∆IN_ = 0
(single-ended)
∆IN_ = 1 (differential) 94
∆IN_ = 0
(single-ended)
∆IN_ = 1 (differential) 92
Preamp = 0dB 47
Preamp = +9dB 49
Preamp = +20dB 42
Into shutdown -70
Out of shutdown -70
PVDD = VDD =
2.7V to 5.5V
f = 217Hz,
100mV
f = 1kHz,
100mV
f = 20kHz,
100mV
Z
= 8Ω +
SPK
68µH, V
Z
= 8Ω +
SPK
68µH, V
Z
= 8Ω +
SPK
68µH, V
Z
= 4Ω +
SPK
33µH, V
= 4Ω +
Z
SPK
33µH, V
1.13 1.2 1.27 V
±1.5
50 76
P-P
P-P
P-P
DD
DD
DD
DD
DD
ripple
ripple
ripple
= 3.7V
= 3.3V
= 3.0V
= 3.7V
= 3.0V
72
68
55
725
560
465
825
770
0.05 %
92
88
dB
mV
dBV
dB
mW
dB
MAX9875
Low RF Susceptibility, Mono Audio
Subsystem with DirectDrive Headphone Amplifier
4 _______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS (continued)
(VDD= V
PVDD
= 3.7V, V
GND
= V
PGND
= 0V. Single-ended inputs, preamp gain = 0dB, volume controls = 0dB, OSC = 00, SHDN = 1.
Speaker loads (Z
SPK
) connected between OUT+ and OUT-. Headphone loads (RHP) connected from HPL or HPR to GND. SDA and
SCL pullup voltage = 3.3V. Z
SPK
= ∞, RHP= ∞. C1 = C2 = C
BIAS
= 1µF. TA= T
MIN
to T
MAX
, unless otherwise noted. Typical values are
at T
A
= +25°C.) (Note 3)
Output Frequency
Current Limit 1.5 A
Efficiency η P
Speaker Gain A
Output Noise
HEADPHONE AMPLIFIERS (OUTMODE = 2)
Output Offset Voltage V
Click-and-Pop Level K
Power-Supply Rejection Ratio
(Note 4)
Output Power P
Headphone Gain A
Channel-to-Channel Gain
Tracking
Total Harmonic Distortion Plus
Noise
Signal-to-Noise Ratio SNR
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
V
OS
CP
PSRR
OUT
V
THD+N
Spread-spectrum modulation mode,
OSC = 00
Fixed-frequency mode, OSC = 01 1100
Fixed-frequency mode, OSC = 10 700
= 600mW, f = 1kHz 87 %
OUT
A-weighted, OUTMODE = 1, ∆IN_ = 0
(Note 4)
TA = +25°C (volume at mute) ±0.15 ±0.6
TA = +25°C (volume at 0dB) ±1.6
Peak voltage, TA =
+25°C, A-weighted,
32 samples per
second. volume at
mute (Note 4)
TA = +25°C, PVDD =
V
DD
THD+N ≤ 1%
TA = +25°C, HPL to HPR, volume at 0dB,
OUTMODE = 2, 5; ∆IN_ = 0
RHP = 32Ω (P
R
= 16Ω (P
HP
= +25°C
T
A
A-weighted,
OUTMODE = 2, 3,
5, 6; R
A-weighted, R
16Ω, OUTMODE =
8, 9
HP
OUT
OUT
= 16Ω
HP
Into shutdown -80
Out of shutdown -80
PVDD = VDD = 2.7V
to 5.25V
f = 217Hz,
V
f = 1kHz,
V
f = 20kHz,
V
RHP = 16Ω 53
R
= 10mW, f = 1kHz) 0.016
= 10mW, f = 1kHz),
∆IN_ = 0
(single-ended)
∆IN_ = 1 (differential) 98
∆IN_ = 0
=
(single-ended)
∆IN_ = 1 (differential) 96
= 100mV
RIPPLE
= 100mV
RIPPLE
= 100mV
RIPPLE
= 32Ω 27
HP
11.5 12.0 12.5 dB
70 85
P-P
P-P
P-P
-0.4 0 +0.4 dB
1176
±60
63 µV
84
80
62
±0.3 ±2.5 %
0.03
98
96
kHz
RMS
mV
dBV
dB
mW
%
dB
MAX9875
Low RF Susceptibility, Mono Audio
Subsystem with DirectDrive Headphone Amplifier
_______________________________________________________________________________________ 5
ELECTRICAL CHARACTERISTICS (continued)
(VDD= V
PVDD
= 3.7V, V
GND
= V
PGND
= 0V. Single-ended inputs, preamp gain = 0dB, volume controls = 0dB, OSC = 00, SHDN = 1.
Speaker loads (Z
SPK
) connected between OUT+ and OUT-. Headphone loads (RHP) connected from HPL or HPR to GND. SDA and
SCL pullup voltage = 3.3V. Z
SPK
= ∞, RHP= ∞. C1 = C2 = C
BIAS
= 1µF. TA= T
MIN
to T
MAX
, unless otherwise noted. Typical values are
at T
A
= +25°C.) (Note 3)
Slew Rate SR 0.35 V/µs
Capacitive Drive C
Crosstalk HPL to HPR, HPR to HPL, f = 20Hz to 20kHz 65 dB
Charge-Pump Frequency
VOLUME CONTROL
Minimum Setting _VOL = 1 -75 dB
Maximum Setting _VOL = 31 0 dB
Mute Attenuation f = 1kHz, _VOL = 0
Zero-Crossing Detection Timeout ZCD = 1 60 ms
DIGITAL INPUTS
Input-Voltage High (SDA, SCL) V
Input-Voltage Low (SDA, SCL) V
Input-Voltage Low (BIAS) V
Input Hysteresis (SDA, SCL) V
SDA, SCL Input Capacitance C
Input Leakage Current I
BIAS Pullup Current I
DIGITAL OUTPUTS (SDA Open Drain)
Output Low Voltage SDA V
Output Fall Time SDA t
2-WIRE INTERFACE TIMING
External Pullup Voltage Range:
SDA and SCL
Serial Clock Frequency f
Bus Free Time Between STOP
and START Conditions
START Condition Hold t
START Condition Setup Time t
Clock Low Period t
Clock High Period t
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
L
H
L
BL
HYS
IN
IN
BIAS
OL
OF
SCL
t
BUF
HD:STA
SU:STA
LOW
HIGH
Spread-spectrum modulation mode,
OSC = 00
Fixed-frequency mode, OSC = 01 430 550 670
Fixed-frequency mode, OSC = 10 220 350 500
SDA, SCL; TA = +25°C ±1.0 µA
I
= 3mA 0.4 V
SINK
V
to V
H(MIN)
to 400pF, I
bus capacitance = 10pF
L(MAX)
= 3mA
SINK
PGAIN_ = 00 0
PGAIN_ = 01 9Preamp Gain Input A or B
PGAIN_ = 10 20
Speaker 100
Headphone 110
100 pF
588
±30
1.4 V
80 mV
4pF
94 µA
1.7 3.6 V
DC 400 kHz
1.3 µs
0.6 µs
0.6 µs
1.3 µs
0.6 µs
0.4 V
0.15 V
250 ns
kHz
dB
dB
MAX9875
Low RF Susceptibility, Mono Audio
Subsystem with DirectDrive Headphone Amplifier
6 _______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS (continued)
(VDD= V
PVDD
= 3.7V, V
GND
= V
PGND
= 0V. Single-ended inputs, preamp gain = 0dB, volume controls = 0dB, OSC = 00, SHDN = 1.
Speaker loads (Z
SPK
) connected between OUT+ and OUT-. Headphone loads (RHP) connected from HPL or HPR to GND. SDA and
SCL pullup voltage = 3.3V. Z
SPK
= ∞, RHP= ∞. C1 = C2 = C
BIAS
= 1µF. TA= T
MIN
to T
MAX
, unless otherwise noted. Typical values are
at T
A
= +25°C.) (Note 3)
Note 3: All devices are 100% production tested at room temperature. All temperature limits are guaranteed by design.
Note 4: Amplifier inputs are AC-coupled to GND.
Note 5: Output levels higher than 825mW are not recommended for extended durations. Production tested with Z
SPK
= 8Ω + 68µH only.
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
SU:DAT
HD:DAT
t
R
t
F
SU:STO
C
b
100 ns
0 900 ns
0.6 µs
300 ns
300 ns
400 pF
MAX9875
Low RF Susceptibility, Mono Audio
Subsystem with DirectDrive Headphone Amplifier
_______________________________________________________________________________________ 7
Typical Operating Characteristics
(VDD= V
PV
DD
= 3.7V, V
GND
= V
PGND
= 0V. Single-ended inputs, preamp gain = 0dB, volume controls = 0dB, OSC = 00, SHDN = 1.
Speaker loads (Z
SPK
) connected between OUT+ and OUT-. Headphone loads (RHP) connected from HPL or HPR to GND. Z
SPK
=
∞, RHP= ∞. C1 = C2 = C
BIAS
= 1µF. TA= +25°C, unless otherwise noted.)
GENERAL
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
9
HEADPHONE ONLY
INPUTS AC-COUPLED TO GND
OUTMODE = 8
8
= V
V
7
6
SUPPLY CURRENT (mA)
5
4
2.5 5.5
= 3.3V
SDA
SCL
f
= 1176kHz SREAD-SPECTRUM MODE
OSC
f
= 700kHz
OSC
SUPPLY VOLTAGE (V)
SHUTDOWN CURRENT
14
INPUTS AC-COUPLED TO GND
= V
V
SDA
13
12
SCL
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
10
SPEAKER ONLY
INPUTS AC-COUPLED TO GND
9
OUTMODE = 7
= V
= 3.3V
V
SDA
8
7
6
SUPPLY CURRENT (mA)
5
4
MAX9875 toc04
SCL
f
OSC
SPREAD-SPECTRUM MODE
f
OSC
2.5 5.5
SUPPLY VOLTAGE (V)
f
= 1100kHz
OSC
5.04.54.03.53.0
vs. SUPPLY VOLTAGE
= 3.3V
MAX9875 toc01
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
HEADPHONE AND SPEAKER
INPUTS AC-COUPLED TO GND
OUTMODE = 9
= V
SDA
f
SCL
OSC
= 3.3V
f
OSC
SPREAD-SPECTRUM MODE
= 1100kHz
SUPPLY VOLTAGE (V)
V
= 1176kHz
= 1100kHz
f
OSC
= 700kHz
5.04.54.03.53.0
MAX9875 toc02
20
0
-20
13
12
11
10
9
SUPPLY CURRENT (mA)
8
7
2.5 5.5
VOLUME ATTENUATION
vs. _VOL CONTROL CODE
f
OSC
= 1176kHz
= 700kHz
5.04.54.03.53.0
MAX9875 toc05
MAX9875 toc03
11
10
9
SHUTDOWN CURRENT (µA)
8
7
2.5 5.5
SUPPLY VOLTAGE (V)
-40
-60
-80
VOLUME ATTENUATION (dB)
fIN = 1kHz
-100
MEASURED AT HPL
AND HPR
-120
5.04.54.03.53.0
35 0
_VOL CONTROL CODE
15
5
10202530
MAX9875
Low RF Susceptibility, Mono Audio
Subsystem with DirectDrive Headphone Amplifier
8 _______________________________________________________________________________________
Typical Operating Characteristics (continued)
(VDD= V
PV
DD
= 3.7V, V
GND
= V
PGND
= 0V. Single-ended inputs, preamp gain = 0dB, volume controls = 0dB, OSC = 00, SHDN = 1.
Speaker loads (Z
SPK
) connected between OUT+ and OUT-. Headphone loads (RHP) connected from HPL or HPR to GND. Z
SPK
=
∞, RHP= ∞. C1 = C2 = C
BIAS
= 1µF. TA= +25°C, unless otherwise noted.)
SPEAKER AMPLIFIER
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. FREQUENCY
MAX9875 toc06
FREQUENCY (Hz)
THD+N (%)
10k1k100
0.1
1
10
0.01
10 100k
VDD = V
PVDD
= 3.7V
Z
SPK
= 8Ω + 68µH
P
OUT
= 200mW
P
OUT
= 675mW
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. FREQUENCY
MAX9875 toc07
FREQUENCY (Hz)
THD+N (%)
10k1k100
0.1
1
10
0.01
10 100k
VDD = V
PVDD
= 3.7V
Z
SPK
= 4Ω + 33µH
DASHED LINES ARE LIMITED
BY THE ABS. MAX RATINGS
P
OUT
= 1100mW
P
OUT
= 650mW
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. FREQUENCY
MAX9875 toc08
FREQUENCY (Hz)
THD+N (%)
10k1k100
0.1
1
10
0.01
10 100k
P
OUT
= 425mW
P
OUT
= 200mW
VDD = V
PVDD
= 3V
Z
SPK
= 8Ω + 68µH
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. FREQUENCY
MAX9875 toc09
FREQUENCY (Hz)
THD+N (%)
10k1k100
0.1
1
10
0.01
10 100k
P
OUT
= 700mW
P
OUT
= 250mW
VDD = V
PVDD
= 3V
Z
SPK
= 4Ω + 33µH
THD+N (%)
0.01
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. OUTPUT POWER
10
VDD = V
Z
DASHED LINES ARE LIMITED
BY THE ABS. MAX RATINGS
1
fIN = 20Hz
0.1
02.51.0 3.00.5 2.0
PVDD
= 4Ω + 33µH
SPK
= 5V
fIN = 6kHz
fIN = 1kHz
1.5
OUTPUT POWER (W)
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. FREQUENCY
1
VDD = V
P
Z
0.1
f
THD+N (%)
0.01
10 100k
MAX9875 toc12
PVDD
= 200mW
OUT
= 8Ω + 68µH
SPK
= 1176kHz
OSC
= 3.7V
f
= 700kHz
OSC
f
= 1100kHz
OSC
FREQUENCY (Hz)
10k1k100
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. OUTPUT POWER
10
VDD = V
= 8Ω + 68µH
Z
MAX9875 toc10
SPK
1
fIN = 20Hz
THD+N (%)
0.1
0.01
02.0
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. OUTPUT POWER
10
1
THD+N (%)
0.1
0.01
0 1000600400 800200
VDD = V
Z
PVDD
= 8Ω + 68µH
SPK
= 3.7V
fIN = 20Hz
fIN = 1kHz
OUTPUT POWER (mW)
= 5V
PVDD
fIN = 1kHz
OUTPUT POWER (W)
MAX9875 toc11
fIN = 6kHz
1.51.00.5
MAX9875 toc13
fIN = 6kHz
MAX9875
EFFICIENCY
vs. OUTPUT POWER
MAX9875 toc19
OUTPUT POWER (W)
EFFICIENCY (%)
1.5
100
0
50
60
10
80
30
70
20
90
40
03.00.5 2.01.0 2.5
VDD = V
PVDD
= 5V
f
IN
= 1kHz
DASHED LINES ARE LIMITED
BY THE ABS. MAX RATINGS
Z
SPK
= 8Ω + 68µH
Z
SPK
= 4Ω + 33µH
EFFICIENCY
vs. OUTPUT POWER
MAX9875 toc20
OUTPUT POWER (W)
EFFICIENCY (%)
100
0
50
60
10
80
30
70
20
90
40
02.01.51.00.5
VDD = V
PVDD
= 3.7V
f
IN
= 1kHz
DASHED LINES ARE LIMITED
BY THE ABS. MAX RATINGS
Z
SPK
= 8Ω + 68µH
Z
SPK
= 4Ω + 33µH
EFFICIENCY
vs. OUTPUT POWER
MAX9875 toc21
OUTPUT POWER (mW)
EFFICIENCY (%)
100
0
50
60
10
80
30
70
20
90
40
0 1000600200 800400
VDD = V
PVDD
= 3.7V
f
IN
= 1kHz
Z
SPK
= 8Ω + 68µH
f
OSC
= 700kHz
f
OSC
= 1176kHz AND 1100kHz
Typical Operating Characteristics (continued)
(VDD= V
PV
DD
= 3.7V, V
GND
= V
PGND
= 0V. Single-ended inputs, preamp gain = 0dB, volume controls = 0dB, OSC = 00, SHDN = 1.
Speaker loads (Z
SPK
) connected between OUT+ and OUT-. Headphone loads (RHP) connected from HPL or HPR to GND. Z
SPK
=
∞, R
HP
= ∞. C1 = C2 = C
BIAS
= 1µF. TA= +25°C, unless otherwise noted.)
Low RF Susceptibility, Mono Audio
Subsystem with DirectDrive Headphone Amplifier
_______________________________________________________________________________________ 9
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. OUTPUT POWER
10
VDD = V
PVDD
= 4Ω + 33µH
Z
SPK
DASHED LINES ARE LIMITED
BY THE ABS. MAX RATINGS
1
fIN = 20Hz
THD+N (%)
0.1
0.01
0 1.51.00.5
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. OUTPUT POWER
1
VDD = V
PVDD
= 1kHz
f
IN
= 8Ω + 68µH
Z
SPK
= 3.7V
fIN = 6kHz
fIN = 1kHz
OUTPUT POWER (W)
= 3.7V
MAX9875 toc14
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. OUTPUT POWER
10
1
THD+N (%)
0.1
0.01
VDD = V
Z
0600400200
PVDD
= 8Ω + 68µH
SPK
= 3V
fIN = 20Hz
fIN = 1kHz
OUTPUT POWER (mW)
MAX9875 toc15
fIN = 6kHz
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. OUTPUT POWER
10
VDD = V
Z
DASHED LINES ARE LIMITED
BY THE ABS. MAX RATINGS
1
THD+N (%)
0.1
0.01
0 1.20.80.4 1.00.60.2
PVDD
= 4Ω + 33µH
SPK
fIN = 20Hz
= 3V
fIN = 1kHz
OUTPUT POWER (W)
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. OUTPUT POWER
1
f
= 1100kHz
MAX9875 toc17
OSC
f
OSC
MAX9875 toc18
= 700kHz
fIN = 6kHz
MAX9875 toc16
0.1
THD+N (%)
0.01
0800
f
= 1176kHz SSM
OSC
f
= 1100kHz
OSC
OUTPUT POWER (mW)
f
= 700kHz
OSC
600400200
0.1
f
THD+N (%)
0.01
= 1176kHz SSM
OSC
VDD = V
f
IN
Z
0800
OUTPUT POWER (mW)
= 6kHz
= 8Ω + 68µH
SPK
PVDD
600400200
= 3.7V
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