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MAX9729
User Manual
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Rainbow Electronics MAX9729 User Manual

General Description
The MAX9729 stereo DirectDrive™ headphone amplifi­er features bass boost, volume control, an input mux, and an I2C/SMBus™-compatible serial interface. This makes the MAX9729 ideal for portable audio applica­tions where space is at a premium and performance is essential. The MAX9729 operates from a single 1.8V to
3.6V, and uses Maxim’s patented
†
DirectDrive architec­ture, eliminating the need for large DC-blocking capaci­tors. The headphone amplifiers deliver 52mW into a 32Ω load, feature low 0.03% THD+N, and high 90dB PSRR. Maxim’s industry-leading click-and-pop sup­pression circuitry reduces audible transients during power and shutdown cycles.
The BassMax feature boosts the bass response of the amplifier, improving audio reproduction for low-end headphones. The integrated volume control features 32 discrete volume levels along with a ramping function to ensure smooth transitions during shutdown cycles and input selection. The MAX9729’s eight programmable maximum gain settings allow for a wide range of input signal levels. A 3:1 multiplexer/mixer allows the selection and summation of multiple stereo input signal sources. The MAX9729 also includes a dedicated BEEP input with independent attenuation control. BassMax, volume control, gain settings, and input selection are controlled using the I2C/SMBus-compatible serial interface. A low­power, 5µA shutdown mode is controlled through an external logic input or the serial interface.
The MAX9729 consumes only 4.8mA of supply current, provides short-circuit and thermal-overload protection, and is specified over the -40°C to +85°C extended tem­perature range. The MAX9729 is available in a space­saving 28-pin thin QFN package (5mm x 5mm x 0.8mm).
Features
♦ DirectDrive Headphone Amplifier Eliminates
Bulky DC-Blocking Capacitors
♦ 3:1 Input Multiplexer with Digital-Fade Circuitry ♦ Software-Enabled Bass Boost ♦ 32-Step Integrated Volume Control ♦ Beep Input with Programmable Output Level ♦ Low Quiescent Current ♦ Industry-Leading Click-and-Pop Suppression ♦ I2C-Compatible 2-Wire Interface ♦ Short-Circuit Protection ♦ 1.8V to 3.6V Single-Supply Operation ♦ Available in Space-Saving, Thermally Efficient
28-Pin TQFN-EP (5mm x 5mm x 0.8mm)
MAX9729
Stereo Headphone Amplifier with BassMax,
Volume Control, and Input Mux
________________________________________________________________
Maxim Integrated Products
1
19-0857; 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.
EVALUATION KIT
AVAILABLE
Ordering Information
Note: This device is specified over the -40°C to +85°C operating temperature range.
+
Denotes lead-free package. *Last digit of slave address is pin programmable. **EP = Exposed pad.
SMBus is a trademark of Intel Corp.
†
U.S. Patent # 7,061,327
Pin Configuration appears at end of data sheet.
I2C INTERFACE
MUX
MIXER
FADER
CONTROL
VOLUME
CONTROL
BassMax
BassMax
1.8V TO 3.6V
SCL
SDA
INL1
INL2
INL3
INR1
INR2
INR3
BEEP
OUTL
BML
BMR
MAX9729
Σ
Σ
PGA
OUTR
PGA
Simplified Block Diagram
Portable CD/DVD/MD Players
Cell Phones
MP3/PMP Players
Automotive Rear Seat Entertainment (RSE)
Flat-Panel TVs
Applications
PART
MAX9729ETI+ 28 TQFN-EP** 101000_ T2855-5
PIN­PACKAGE
SLAVE
ADDRESS*
PKG
CODE
MAX9729
Stereo Headphone Amplifier with BassMax, Volume Control, and Input Mux
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS (3V Supply)
(VDD= PVDD= SHDN = 3V, PGND = SGND = 0V, C1 = C2 = C3 = 1µF, BM_ = 0V, maximum gain setting = 6dB, volume attenuation setting = -16dB (overall gain = -10dB), BassMax disabled. Load connected between OUT_ and PGND where specified. THD+N measurement BW = 22Hz to 22kHz. 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.
VDD, PVDDto PGND or SGND .................................-0.3V to +4V
V
DD
to PVDD................................................Internally Connected
PV
SS
to SVSS.......................................................................±0.3V
SGND to PGND...................................................................±0.3V
C1P to PGND..............................................-0.3V to (V
DD
+ 0.3V)
C1N to PGND............................................(PV
SS
- 0.3V) to +0.3V
PV
SS
, SVSSto PGND ................................................+0.3V to -4V
INL_, INR_, BEEP to SGND............(SV
SS
- 0.3V) to (VDD+ 0.3V)
SDA, SCL, BEEP_EN to PGND.................................-0.3V to +4V
SHDN to PGND ..........................................-0.3V to (V
DD
+ 0.3V)
OUT_ to PGND ............................................................-3V to +3V
BM_ to SGND ..............................................................-2V to +2V
Duration of OUT_ Short Circuit to PGND....................Continuous
Continuous Current Into/Out of:
V
DD
, C1P, C1N, PGND, PVSS, SVSS, or OUT_ .............±0.85A
All other pins.................................................................±20mA
Continuous Power Dissipation (T
A
= +70°C, multilayer board)
28-Pin Thin QFN (derate 28.6mW/°C above +70°C) 0.2286mW
Junction-to-Ambient Thermal Resistance (θ
JA
)
28-Pin TQFN.................................................................35°C/W
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
OUT_ ESD Protection (Human Body Model) .......................±8kV
ESD Protection of All Other Pins ..........................................±2kV
Lead Temperature (soldering, 10s) .................................+300°C
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
GENERAL
Supply Voltage Range V
Charge-Pump and Logic Supply Voltage
Quiescent Supply Current I
Shutdown Supply Current I
Turn-On Time t
Beep Enable Time t
Thermal Shutdown Threshold T
Thermal Shutdown Hysteresis T
HEADPHONE AMPLIFIER
Input Resistance R
Output Offset Voltage V
BMR, BML Input Bias Current I
DD
PV
DD
DD
DD_SHDNVSHDN
ON
ON_BEEP
THRES
HYST
IN
OSHP
BIAS_BM
(Note 2) 1.8 3.6 V
(Note 2) 1.8 3.6 V
No load, BEEP_EN = VDD (Note 3) 5.5 8 mA
= 0V 5 10 µA
From shutdown mode to full operation 200 µs
Applicable to all maximum gain and volume settings
Measured between OUT_ and SGND, overall gain = -10dB (Note 3)
12 µs
146 °C
13 °C
14 25 35 kΩ
±0.7 ±3.5 mV
±10 ±100 nA
MAX9729
Stereo Headphone Amplifier with BassMax,
Volume Control, and Input Mux
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (3V Supply) (continued)
(VDD= PVDD= SHDN = 3V, PGND = SGND = 0V, C1 = C2 = C3 = 1µF, BM_ = 0V, maximum gain setting = 6dB, volume attenuation setting = -16dB (overall gain = -10dB), BassMax disabled. Load connected between OUT_ and PGND where specified. THD+N measurement BW = 22Hz to 22kHz. 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
Power-Supply Rejection Ratio
Output Power P
Total Harmonic Distortion Plus Noise
Maximum Gain A
Beep Input Attenuation A
Signal-to-Noise Ratio SNR
Slew Rate SR 0.5 V/µs
Capacitive Drive No sustained oscillations 200 pF
Output Resistance in Shutdown R
PSRR (Note 3)
OUT
THD+N
VMAX
V_BEEP
OUT_SHDN
VDD = 1.8V to 3.6V, overall gain = 6dB
f = 217Hz, 100mV ripple, overall gain = 26dB
f = 1kHz, 100mV overall gain = 26dB
f = 20kHz, 100mV ripple, overall gain = 26dB
THD+N = 1%,
= 1kHz, overall
f
IN
gain = 1.8dB, T
= +25°C (Note 4)
A
f
= 1kHz, overall
IN
gain = 3.5dB (Note 4)
Register 0x01, B[2:0] = 000 3.5
Register 0x01, B[2:0] = 001 6
Register 0x01, B[2:0] = 010 8
Register 0x01, B[2:0] = 011 10
Register 0x01, B[2:0] = 100 19.5
Register 0x01, B[2:0] = 101 22
Register 0x01, B[2:0] = 110 24
Register 0x01, B[2:0] = 111 26
Register 0x01, B[7:5] = 000 10
Register 0x01, B[7:5] = 001 20
Register 0x01, B[7:5] = 010 30
Register 0x01, B[7:5] = 011 40
Register 0x01, B[7:5] = 100 50
Register 0x01, B[7:5] = 101 52
Register 0x01, B[7:5] = 110 54
Register 0x01, B[7:5] = 111 56
R
= 32Ω,
L
V
= 1V
OUT
= 0V, measured from OUT_ to
V
SHDN
SGND
BW = 22Hz to 22kHz 99
BW = 22Hz to 22kHz
RMS
and A-weighted
P-P
ripple,
P-P
P-P
RL = 16Ω 12 49
R
= 32Ω 21 52
L
RL = 16Ω ,
= 42m W
P
OU T
= 32Ω ,
R
L
P
= 40m W
OU T
72 95
90
82
58
0.04
0.04
101
20 kΩ
dB
mW
%
dB
dB
dB
MAX9729
Stereo Headphone Amplifier with BassMax, Volume Control, and Input Mux
4 _______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS (3V Supply) (continued)
(VDD= PVDD= SHDN = 3V, PGND = SGND = 0V, C1 = C2 = C3 = 1µF, BM_ = 0V, maximum gain setting = 6dB, volume attenuation setting = -16dB (overall gain = -10dB), BassMax disabled. Load connected between OUT_ and PGND where specified. THD+N measurement BW = 22Hz to 22kHz. T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)
ELECTRICAL CHARACTERISTICS (2.4V Supply)
(VDD= PVDD= SHDN = 2.4V, PGND = SGND = 0V, C1 = C2 = C3 = 1µF, BM_ = 0V, maximum gain setting = 6dB, volume attenuation setting = -16dB (overall gain = -10dB), BassMax disabled. Load connected between OUT_ and PGND where specified. THD+N measurement BW = 22Hz to 22kHz. 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
Click-and-Pop Level K
Charge-Pump Switching Frequency f
Crosstalk
DIGITAL INPUTS (SHDN, SDA, SCL, BEEP_EN)
Input High Voltage V
Input Low Voltage V
Input Leakage Current -1 +1 µA
DIGITAL OUTPUTS (SDA)
Output Low Voltage V
Output High Current I
CP
CP
IH
IL
OL
OH
Peak voltage, A­weighted, 32 samples per second (Notes 3 and 5)
L to R, or R to L, f = 10kHz, V 1V
, RL = 32Ω, both channels loaded
RMS
IOL = 3mA 0.4 V
V
= V
SDA
DD
Into shutdown 81
Out of shutdown 80
505 600 730 kHz
=
OUT
1.4 V
78 dB
0.4 V
1µA
dBV
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Quiescent Current I
Shutdown Current I
Output Power P
Total Harmonic Distortion Plus Noise
Power-Supply Rejection Ratio PSRR
DD
SHDN
OUT
THD+N
No load (Note 3) 4.5 mA
V
= 0V 4 µA
SHDN
THD+N = 1%, f
= 1kHz, overall
IN
gain = 3.5dB, T
= +25°C
A
(Note 4)
f
= 1kHz, overall
IN
gain = 3.5dB (Note 4)
100mV (Note 3)
P-P
ripple
RL = 16Ω 32
= 32Ω 32
R
L
RL = 16Ω ,
= 23m W
P
OU T
= 32Ω ,
R
L
= 23m W
P
OU T
f = 217Hz 90
f = 1kHz 85
f = 10kHz 61
0.03
0.03
mW
%
dB
MAX9729
Stereo Headphone Amplifier with BassMax,
Volume Control, and Input Mux
_______________________________________________________________________________________ 5
TIMING CHARACTERISTICS
(VDD= PVDD= SHDN = 3V, PGND = SGND = 0V, C1 = C2 = C3 = 1µF, BM_ = 0V, maximum gain setting = 6dB, volume setting = -16dB (overall gain = -10dB), BassMax disabled. Load connected between OUT_ and PGND where specified. T
A
= T
MIN
to T
MAX
, unless other-
wise noted. Typical values are at T
A
= +25°C.) (Notes 1 and 6)
ELECTRICAL CHARACTERISTICS (2.4V Supply) (continued)
(VDD= PVDD= SHDN = 2.4V, PGND = SGND = 0V, C1 = C2 = C3 = 1µF, BM_ = 0V, maximum gain setting = 6dB, volume attenuation setting = -16dB (overall gain = -10dB), BassMax disabled. Load connected between OUT_ and PGND where specified. THD+N measurement BW = 22Hz to 22kHz. T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)
Note 1: All specifications are 100% tested at TA= +25°C. Temperature limits are guaranteed by design. Note 2: V
DD
and PVDDmust be connected together.
Note 3: Inputs AC-coupled to SGND. Note 4: Both channels loaded and driven in phase. Note 5: Headphone testing performed with a 32Ω resistive load connected to PGND. Mode transitions are controlled by SHDN. K
CP
level is calculated as 20log[(peak voltage during mode transition, no input signal)/1V
RMS
]. Units are expressed in dBV.
Note 6: Guaranteed by design.
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Signal-to-Noise Ratio SNR
Click-and-Pop Level K
CP
= 32Ω,
R
L
= 1V
V
OUT
overall gain =
3.5dB
Peak voltage, A-weighted, 32 samples per second (Notes 3 and 5)
RMS
BW = 22Hz to 22kHz 98
,
BW = 22Hz to 22kHz and A-weighted
Into shutdown 79
Out of shutdown 79
101
dB
dBV
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Serial Clock Frequency f
Bus Free Time Between a STOP and a START Condition
Hold Time Repeated for a START Condition
Low Period of the SCL Clock t
High Period of the SCL Clock t
Setup Time for a Repeated START Condition
Data Hold Time t
Data Setup Time t
Rise Time of Both SDA and SCL Signals t
Fall Time of Both SDA and SCL Signals t
Setup Time for STOP Condition t
Pulse Width of Suppressed Spike t
Capacitive Load for Each Bus Line C
SCL
t
BUF
t
HD:STA
LOW
HIGH
t
SU:STA
HD:DAT
SU:DAT
r
f
SU:STO
SP
L_BUS
0 400 kHz
1.3 µs
0.6 µs
1.3 µs
0.6 µs
0.6 µs
0 0.9 µs
100 ns
0.6 µs
50 ns
300 ns
300 ns
400 pF
MAX9729
Stereo Headphone Amplifier with BassMax, Volume Control, and Input Mux
6 _______________________________________________________________________________________
Typical Operating Characteristics
(VDD= PVDD= SHDN = 3V, PGND = SGND = 0V, C1 = C2 = C3 = 1µF, CIN= 1µF (1206 case size, X7R dielectric ceramic capacitor), BM_ = 0V, maximum gain setting = 3.5dB, volume attenuation setting = 0dB (total voltage gain = 3.5dB), BassMax disabled. Load connected between OUT_ and PGND where specified. THD+N measurement BW = 22Hz to 22kHz. Both channels loaded and driven in phase. T
A
= +25°C, unless otherwise noted.)
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. OUTPUT POWER
MAX9729 toc01
OUTPUT POWER PER CHANNEL (mW)
THD+N (%)
50 60 7010 20 30 40080
100
0.01
0.1
1
10
VDD = 3V R
L
= 16Ω
fIN = 100Hz
fIN = 5kHz
fIN = 1kHz
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. OUTPUT POWER
MAX9729 toc02
OUTPUT POWER PER CHANNEL (mW)
THD+N (%)
50 60 7010 20 30 40080
100
0.01
0.1
1
10
VDD = 3V R
L
= 32Ω
fIN = 100Hz
fIN = 1kHz
fIN = 5kHz
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. OUTPUT POWER
MAX9729 toc03
OUTPUT POWER PER CHANNEL (mW)
THD+N (%)
0 5 10 15 20 25 30 35 40 45 50
100
0.01
0.1
1
10
VDD = 2.4V R
L
= 16Ω
fIN = 100Hz
fIN = 1kHz
fIN = 5kHz
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. OUTPUT POWER
MAX9729 toc04
OUTPUT POWER PER CHANNEL (mW)
THD+N (%)
0 5 10 15 20 25 30 35 40 45 50
100
0.01
0.1
1
10
VDD = 2.4V R
L
= 32Ω
fIN = 100Hz
fIN = 1kHz
fIN = 5kHz
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. FREQUENCY
MAX9729 toc05
FREQUENCY (Hz)
THD+N (%)
10k1k100
0.1
0.01
1
0.001 10 100k
VDD = 3V R
L
= 16Ω
P
OUT
= 42mW
P
OUT
= 9mW
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. FREQUENCY
MAX9729 toc06
FREQUENCY (Hz)
THD+N (%)
10k1k100
0.01
0.1
1
0.001 10 100k
VDD = 3V R
L
= 32Ω
P
OUT
= 40mW
P
OUT
= 5mW
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. FREQUENCY
MAX9729 toc07
FREQUENCY (Hz)
THD+N (%)
10k1k100
0.01
0.1
1
0.001 10 100k
VDD = 2.4V R
L
= 16Ω
P
OUT
= 23mW
P
OUT
= 8mW
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. FREQUENCY
MAX9729 toc08
FREQUENCY (Hz)
THD+N (%)
10k1k100
0.01
0.1
1
0.001 10 100k
VDD = 2.4V R
L
= 32Ω
P
OUT
= 23mW
P
OUT
= 3mW
0
50
200
100
150
300
250
350
0 20 40 60 80 100 140120 160 180
POWER DISSIPATION
vs. OUTPUT POWER
MAX9729 toc09
OUTPUT POWER (mW)
POWER DISSIPATION (mW)
VDD = 3V f
IN
= 1kHz
P
OUT
= P
OUTL
+ P
OUTR
RL = 32Ω
RL = 16Ω
MAX9729
Stereo Headphone Amplifier with BassMax,
Volume Control, and Input Mux
_______________________________________________________________________________________
7
Typical Operating Characteristics (continued)
(VDD= PVDD= SHDN = 3V, PGND = SGND = 0V, C1 = C2 = C3 = 1µF, CIN= 1µF (1206 case size, X7R dielectric ceramic capacitor), BM_ = 0V, maximum gain setting = 3.5dB, volume attenuation setting = 0dB (total voltage gain = 3.5dB), BassMax disabled. Load connected between OUT_ and PGND where specified. THD+N measurement BW = 22Hz to 22kHz. Both channels loaded and driven in phase. T
A
= +25°C, unless otherwise noted.)
250
200
150
100
POWER DISSIPATION (mW)
120
100
POWER DISSIPATION
vs. OUTPUT POWER
VDD = 2.4V
= 1kHz
f
IN
= P
OUT
OUTL
+ P
OUTR
RL = 16Ω
RL = 32Ω
OUTPUT POWER (mW)
P
50
0
0406020 80 100 120
OUTPUT POWER
vs. SUPPLY VOLTAGE
fIN = 1kHz
= 16Ω
R
L
90
80
MAX9729 toc10
70
60
50
40
30
20
OUTPUT POWER PER CHANNEL (mW)
10
0
10 100 1000
120
fIN = 1kHz
= 32Ω
R
L
100
MAX9729 toc13
OUTPUT POWER
vs. LOAD RESISTANCE
THD+N = 10%
THD+N = 1%
LOAD RESISTANCE (Ω)
OUTPUT POWER
vs. SUPPLY VOLTAGE
VDD = 3V
= 1kHz
f
IN
50
45
MAX9729 toc11
40
35
30
25
20
15
10
OUTPUT POWER PER CHANNEL (mW)
5
0
10 100 1000
POWER-SUPPLY REJECTION RATIO
0
VDD = 3V SUPPLY RIPPLE 100mV
-20
vs. LOAD RESISTANCE
MAX9729 toc14
RL = 32Ω
OUTPUT POWER
THD+N = 10%
THD+N = 1%
LOAD RESISTANCE (Ω)
vs. FREQUENCY
P-P
VDD = 2.4V
= 1kHz
f
IN
MAX9729 toc12
MAX9729 toc15
80
60
40
20
OUTPUT POWER PER CHANNEL (mW)
0
THD+N = 10%
THD+N = 1%
SUPPLY VOLTAGE (V)
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
0
VDD = 2.4V SUPPLY RIPPLE 100mV
-20
RL = 32Ω
-40
-60
PSRR (dB)
-80
-100
-120 10 100k
P-P
HPR
HPL
FREQUENCY (Hz)
MAX9729 toc17
-40
-60
PSRR (dB)
-80
-100
-120 10 100k
HPR
HPL
FREQUENCY (Hz)
CROSSTALK vs. FREQUENCY
0
GAIN = 19.5dB
= 1V
V
OUT
RL = 32Ω
P-P
FREQUENCY (Hz)
-20
-40
-60
CROSSTALK (dB)
-80
-100
-120 10 100k
10k1k100
MAX9729 toc18
L TO R
R TO L
10k1k100
3.43.22.8 3.02.2 2.4 2.62.01.8 3.6
80
60
40
20
OUTPUT POWER PER CHANNEL (mW)
0
THD+N = 10%
THD+N = 1%
3.43.22.8 3.02.2 2.4 2.62.01.8 3.6
SUPPLY VOLTAGE (V)
CROSSTALK vs. FREQUENCY
0
GAIN = 3.5dB
= 1V
V
OUT
RL = 32Ω
P-P
R TO L
L TO R
10k1k100
FREQUENCY (Hz)
-20
MAX9729 toc16
-40
-60
CROSSTALK (dB)
-80
-100
10k1k100
-120 10 100k
MAX9729
Stereo Headphone Amplifier with BassMax, Volume Control, and Input Mux
8 _______________________________________________________________________________________
Typical Operating Characteristics (continued)
(VDD= PVDD= SHDN = 3V, PGND = SGND = 0V, C1 = C2 = C3 = 1µF, CIN= 1µF (1206 case size, X7R dielectric ceramic capacitor), BM_ = 0V, maximum gain setting = 3.5dB, volume attenuation setting = 0dB (total voltage gain = 3.5dB), BassMax disabled. Load connected between OUT_ and PGND where specified. THD+N measurement BW = 22Hz to 22kHz. Both channels loaded and driven in phase. T
A
= +25°C, unless otherwise noted.)
-10
-20
-30
-40
-50
-60
CROSSTALK (dB)
-70
-80
-90
-100
-100
-120
OUTPUT MAGNITUDE (dBV)
-140
-160
CROSSTALK vs. FREQUENCY
0
GAIN = 3.5dB
= 1V
V
OUT
P-P
RL = 16Ω
L TO R
R TO L
10 100k
FREQUENCY (Hz)
10k1k100
OUTPUT SPECTRUM
0
VDD = 3V
= 1kHz
f
IN
-20 = 32Ω
R
L
-40
-60
-80
0468102 1214161820
FREQUENCY (kHz)
-20
MAX9729 toc19
-40
-60
CROSSTALK (dB)
-80
-100
-120
MAX9729 toc22
OUTPUT POWER (mW)
CROSSTALK vs. FREQUENCY
MAX9729 toc20
GAIN (dB)
-10
MAX9729 toc23
OUTPUT POWER (mW)
20
15
10
5
0
-5
DISABLED
OUTPUT POWER vs. CHARGE-PUMP
CAPACITANCE AND LOAD RESISTANCE
40
35
30
25
20
15
10
5
0
060
0
GAIN = 19.5dB
= 1V
V
OUT
P-P
RL = 16Ω
L TO R
R TO L
10 100k
FREQUENCY (Hz)
10k1k100
OUTPUT POWER vs. CHARGE-PUMP
CAPACITANCE AND LOAD RESISTANCE
60
50
40
30
20
10
0
060
C1 = C2 = 0.68μF
LOAD RESISTANCE (Ω)
C1 = C2 = 1μF
VDD = 3V
= 1kHz
f
IN
THD+N = 1%
402010 30 50
RESPONSE
R2 = 36kΩ C4 = 0.068μF
R2 = 22kΩ C6 = 0.1μF
R2 = 10kΩ C6 = 0.22μF
FREQUENCY (Hz)
C1 = C2 = 1μF
LOAD RESISTANCE (Ω)
BASS BOOST FREQUENCY
C1 = C2 = 0.68μF
4020 30 5010
NO LOAD R1 = 47kΩ
10k1k10010 100k
VDD = 2.4V
= 1kHz
f
IN
THD+N = 1%
MAX9729 toc21
MAX9729 toc24
POWER-UP/POWER-DOWN
ENTERING SHUTDOWN
V
2V/div
V
OUT_
10mV/div
WAVEFORM
DD
100ms/div
MAX9729 toc25
V
SHDN
2V/div
V
OUT_
2V/div
EXITING SHUTDOWN
40μs/div
MAX9729 toc26
V
SHDN
2V/div
V
OUT_
2V/div
MAX9729 toc27
40μs/div
MAX9729
Stereo Headphone Amplifier with BassMax,
Volume Control, and Input Mux
_______________________________________________________________________________________ 9
Typical Operating Characteristics (continued)
(VDD= PVDD= SHDN = 3V, PGND = SGND = 0V, C1 = C2 = C3 = 1µF, CIN= 1µF (1206 case size, X7R dielectric ceramic capacitor), BM_ = 0V, maximum gain setting = 3.5dB, volume attenuation setting = 0dB (total voltage gain = 3.5dB), BassMax disabled. Load connected between OUT_ and PGND where specified. THD+N measurement BW = 22Hz to 22kHz. Both channels loaded and driven in phase. T
A
= +25°C, unless otherwise noted.)
Pin Description
PIN NAME FUNCTION
1 INR2 Right-Channel Input 2
2 INR3 Right-Channel Input 3
3 SGND Signal Ground. Connect SGND to PGND at a single point on the PCB near the device.
4, 8, 15,
22
N.C. No Connection. Not internally connected.
5 ADD
Slave Address Selection Input. Connect ADD to V
DD
to set the device slave address to 1010001 or to
PGND to set the device slave address to 1010000.
6PVSSCharge-Pump Output. Connect to SVSS.
7 SDA Serial Data Input. Connect a pullup resistor greater than 500Ω from SDA to PVDD.
9 C1N Charge-Pump Flying Capacitor Negative Terminal. Connect a 1µF capacitor between C1P and C1N.
10 PGND Power Ground. Connect PGND to SGND at a single point on the PCB near the device.
11 C1P Charge-Pump Flying Capacitor Positive Terminal. Connect a 1µF capacitor between C1P and C1N.
12 SCL Serial Clock Input. Connect a pullup resistor greater than 500Ω from SCL to PVDD.
13 PV
DD
Charge-Pump and Logic Power-Supply Input. Bypass PVDD to PGND with a 1µF capacitor and connect to V
DD
. PVDD and VDD are internally connected and should each have a 1µF bypass capacitor located
as close to the device as possible.
14 SV
SS
Headphone Amplifier Negative Power-Supply Input. Connect to PVSS and bypass with a 1µF capacitor to PGND.
200mV/div
200mV/div
100mV/div
FADER OPERATION
20ms/div
MAX9729 toc28
SUPPLY CURRENT
6
5
4
SUPPLY CURRENT (mA)
3
2
1.8 3.6
vs. SUPPLY VOLTAGE
NO LOAD INPUTS AC-GROUNDED
SUPPLY VOLTAGE (V)
SHUTDOWN CURRENT
7
MAX9729 toc29
3.43.23.02.82.62.42.22.0
6
5
4
3
2
SUPPLY CURRENT (μA)
1
0
1.8 3.6
vs. SUPPLY VOLTAGE
3.43.23.02.82.62.42.22.0
SUPPLY VOLTAGE (V)
MAX9729 toc30
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