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MAX9724DETC+

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P19
General Description
The MAX9724C/MAX9724D stereo headphone ampli-
fiers are designed for portable equipment where board
space is at a premium. These devices use a unique,
DirectDrive
®
architecture to produce a ground-refer-
enced output from a single supply, eliminating the need
for large DC-blocking capacitors, saving cost, board
space, and component height. The MAX9724 sup-
presses RF radiation received by input and supply
traces acting as antennas and prevents the amplifier
from demodulating the coupled noise. The MAX9724C
offers an externally adjustable gain while the
MAX9724D has an internally preset gain of -1.5V/V. The
MAX9724C/MAX9724D deliver up to 60mW per channel
into a 32Ω load and have low 0.02% THD+N. An 80dB
at 1kHz power-supply rejection ratio (PSRR) allows
these devices to operate from noisy digital supplies
without an additional linear regulator. Comprehensive
click-and-pop circuitry suppresses audible clicks and
pops on startup and shutdown.
The MAX9724C/MAX9724D operate from a single 2.5V
to 5.5V supply, consume only 3.5mA of supply current,
feature short-circuit and thermal-overload protection,
and are specified over the extended -40°C to +85°C
temperature range. The devices are available in tiny
12-bump UCSP™ (1.5mm x 2mm) and 12-pin thin QFN
(3mm x 3mm x 0.8mm) packages.
Applications
Features
♦ Improved RF Noise Rejection (Up to 67dB Over
Typical Amplifiers)
♦ No Bulky DC-Blocking Capacitors Required
♦ Low-Power Shutdown Mode, < 0.1µA
♦ Adjustable Gain (MAX9724C) or Fixed -1.5V/V
Gain (MAX9724D)
♦ Low 0.02% THD+N
♦ High PSRR (80dB at 1kHz) Eliminates LDO
♦ Integrated Click-and-Pop Suppression
♦ 2.5V to 5.5V Single-Supply Operation
♦ Low Quiescent Current (3.5mA)
♦ Available in Space-Saving Packages
12-Bump UCSP (1.5mm x 2mm)
12-Pin Thin QFN (3mm x 3mm x 0.8mm)
MAX9724C/MAX9724D
Low RF Susceptibility DirectDrive Stereo Head-
phone Amplifier with 1.8V Compatible Shutdown
________________________________________________________________
Maxim Integrated Products
1
Ordering Information
19-4130; Rev 0; 5/08
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.
PART
GAIN (V/V)
PIN-PACKAGE
TOP
MARK
MAX9724CEBC+T
Adj. 12 UCSP +AGE
MAX9724CETC+
Adj.
12 TQFN-EP*
+ABJ
MAX9724DEBC+T
-1.5 12 UCSP +AEH
MAX9724DETC+
-1.5
12 TQFN-EP*
+ABK
Note: All devices specified over the -40°C to +85°C operating
range.
+
Denotes a lead-free package.
T = Tape and reel.
*
EP = Exposed pad.
Cellular Phones
MP3 Players
Notebook PCs
Handheld Gaming Consoles
LEFT
AUDIO
INPUT
RIGHT
AUDIO
INPUT
SHDN
MAX9724C
LEFT
AUDIO
INPUT
RIGHT
AUDIO
INPUT
MAX9724D
SHDN
DirectDrive OUTPUTS
ELIMINATE DC-BLOCKING
CAPACITORS
DirectDrive OUTPUTS
ELIMINATE DC-BLOCKING
CAPACITORS
FIXED GAIN ELIMINATES
EXTERNAL RESISTOR
NETWORK
Block Diagrams
Pin Configurations appear at end of data sheet.
DVD Players
Smart Phones
PDAs
DirectDrive is a registered trademark of
Maxim Integrated Products, Inc.
UCSP is a trademark of Maxim Integrated Products, Inc.
MAX9724C/MAX9724D
Low RF Susceptibility DirectDrive Stereo Head-
phone Amplifier with 1.8V Compatible Shutdown
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
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.
V
DD
to GND..............................................................-0.3V to +6V
PVSS to SVSS ........................................................-0.3V to +0.3V
PGND to SGND .....................................................-0.3V to +0.3V
C1P to PGND..............................................-0.3V to (V
DD
+ 0.3V)
C1N to PGND ...........................................(PVSS - 0.3V) to +0.3V
PVSS and SVSS to PGND.........................................-6V to +0.3V
IN_ to SGND (MAX9724C) .........................-0.3V to (V
DD
+ 0.3V)
IN_ to SGND (MAX9724D) ............(SVSS - 0.3V) to (V
DD
+ 0.3V)
OUT_ to SVSS (Note 1) ...-0.3V to Min (V
DD
- SVSS + 0.3V, +9V)
OUT_ to V
DD
(Note 2) .....+0.3V to Max (SVSS - V
DD
- 0.3V, -9V)
SHDN to _GND.........................................................-0.3V to +6V
OUT_ Short Circuit to GND ........................................Continuous
Short Circuit between OUTL and OUTR ....................Continuous
Continuous Input Current into PVSS .................................260mA
Continuous Input Current (any other pin) .........................±20mA
Continuous Power Dissipation (T
A
= +70°C, multilayer board)
12-Bump UCSP (derate 6.5mW/°C above +70°C) ........519mW
θ
JA
................................................................................154 C/W
12-Pin TQFN (derate 16.7mW/°C above +70°C) .........1333mW
θ
JA
..................................................................................60°C/W
θ
JC
..................................................................................11°C/W
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range .............................-65°C to +150°C
Junction Temperature......................................................+150°C
Lead Temperature (soldering, 10s) .................................+300°C
Bump Temperature (soldering) Reflow............................+235°C
ELECTRICAL CHARACTERISTICS
(V
DD
= 5V, PGND = SGND, SHDN = 5V, C1 = C2 = 1µF, R
L
= ∞, resistive load reference to ground; for MAX9724C gain = -1.5V/V
(R
IN
= 20kΩ, R
F
= 30kΩ); for MAX9724D gain = -1.5V/V (internally set), T
A
= -40°C to +85°C, unless otherwise noted. Typical values
are at T
A
= +25°C, unless otherwise noted.) (Note 3)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
GENERAL
Supply Voltage Range V
DD
2.5 5.5 V
Quiescent Current I
CC
3.5 5.5 mA
Shutdown Current I
SHDN
SHDN = SGND = PGND 0.1 1 µA
Shutdown to Full Operation t
SON
180 µs
Input Impedance R
IN
MAX9724D, measured at IN_ 12 19 28 kΩ
Output Offset Voltage V
OS
T
A
= +25°C (Note 4) ±1.5 ±10 mV
V
DD
= 2.7V to 5.5V, T
A
= +25°C 69 86
f = 1kHz, 100mV
P-P
(Note 4) 80Power-Supply Rejection Ratio PSRR
f = 20kHz, 100mV
P-P
(Note 4) 65
dB
R
L
= 32Ω, THD+N = 1% 30 63
Output Power (TQFN) P
OUT
R
L
= 16Ω, THD+N = 1% 42
mW
R
L
= 32Ω, THD+N = 1% 25 45
Output Power (UCSP) P
OUT
R
L
= 16Ω, THD+N = 1% 35
mW
Voltage Gain A
V
MAX9724D (Note 5) -1.52 -1.5 -1.48 V/V
Channel-to-Channel Gain Tracking MAX9724D ±0.15 %
R
L
= 1kΩ, V
OUT
= 2V
RMS
, f
IN
= 1kHz 0.003
R
L
= 32Ω, P
OUT
= 50mW, f
IN
= 1kHz 0.02
Total Harmonic Distortion Plus
Noise (TQFN) (Note 6)
THD+N
R
L
= 16Ω, P
OUT
= 35mW, f
IN
= 1kHz 0.04
%
R
L
= 1kΩ, V
OUT
= 2V
RMS
, f
IN
= 1kHz 0.003
R
L
= 32Ω, P
OUT
= 45mW, f
IN
= 1kHz 0.03
Total Harmonic Distortion Plus
Noise (UCSP) (Note 6)
THD+N
R
L
= 16Ω, P
OUT
= 32mW, f
IN
= 1kHz 0.05
%
BW = 22Hz to 22kHz 102
R
L
= 1kΩ,
V
OUT
= 2V
RMS
A-weighted 105
BW = 22Hz to 22kHz 98
Signal-to-Noise Ratio SNR
R
L
= 32Ω,
P
OUT
= 50mW
A-weighted 101
dB
Note 1: OUTR and OUTL should be limited to no more than 9V above SVSS, or above V
DD
+ 0.3V, whichever limits first.
Note 2: OUTR and OUTL should be limited to no more than 9V below V
DD
, or below SVSS - 0.3V, whichever limits first.
MAX9724C/MAX9724D
Low RF Susceptibility DirectDrive Stereo Head-
phone Amplifier with 1.8V Compatible Shutdown
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= 5V, PGND = SGND, SHDN = 5V, C1 = C2 = 1µF, R
L
= ∞, resistive load reference to ground; for MAX9724C gain = -1.5V/V
(R
IN
= 20kΩ, R
F
= 30kΩ); for MAX9724D gain = -1.5V/V (internally set), T
A
= -40°C to +85°C, unless otherwise noted. Typical values
are at T
A
= +25°C, unless otherwise noted.) (Note 3)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Slew Rate SR 0.5 V/µs
Capacitive Drive C
L
No sustained oscillations 100 pF
Crosstalk
L to R, R to L, f = 10kHz, R
L
= 16Ω,
P
OUT
= 15mW
-70 dB
Charge-Pump Oscillator
Frequency
f
OSC
190 270 400 kHz
Into shutdown -67
Click-and-Pop Level K
CP
R
L
= 32Ω, peak voltage,
A-weighted, 32 samples per
second (Notes 4, 7)
Out of
shutdown
-64
dB
DIGITAL INPUTS (SHDN)
Input-Voltage High V
INH
1.4 V
Input-Voltage Low V
INL
0.4 V
Input Leakage Current ±1 µA
ELECTRICAL CHARACTERISTICS
(V
DD
= 3V, PGND = SGND, SHDN = 3V, C1 = C2 = 1µF, R
L
= ∞, resistive load reference to ground; for MAX9724C gain = -1.5V/V
(R
IN
= 20kΩ, R
F
= 30kΩ); for MAX9724D gain = -1.5V/V (internally set), T
A
= -40°C to +85°C, unless otherwise noted. Typical values
are at T
A
= +25°C, unless otherwise noted.) (Note 3)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Quiescent Current I
CC
3.0 mA
Shutdown Current I
SHDN
SHDN = SGND = PGND 0.1 µA
f = 1kHz, 100mV
P-P
80
Power-Supply Rejection Ratio
(Note 4)
PSRR
f = 20kHz, 100mV
P-P
65
dB
R
L
= 32Ω, THD+N = 1% 20
Output Power (TQFN) P
OUT
R
L
= 16Ω, THD+N = 1% 14
mW
R
L
= 32Ω, THD+N = 1% 17
Output Power (UCSP) P
OUT
R
L
= 16Ω, THD+N = 1% 12
mW
R
L
= 1kΩ, V
OUT
= 2V
RMS
, f
IN
= 1kHz 0.05
R
L
= 32Ω, P
OUT
= 15mW, f
IN
= 1kHz 0.03
Total Harmonic Distortion Plus
Noise (TQFN) (Note 6)
THD+N
R
L
= 16Ω, P
OUT
= 10mW, f
IN
= 1kHz 0.06
%
R
L
= 1kΩ, V
OUT
= 2V
RMS
, f
IN
= 1kHz 0.003
R
L
= 32Ω, P
OUT
= 15mW, f
IN
= 1kHz 0.04
Total Harmonic Distortion Plus
Noise (UCSP) (Note 6)
THD+N
R
L
= 16Ω, P
OUT
= 10mW, f
IN
= 1kHz 0.06
%
Note 3: All specifications are 100% tested at T
A
= +25°C; temperature limits are guaranteed by design.
Note 4: The amplifier inputs are AC-coupled to GND.
Note 5: Gain for the MAX9724C is adjustable.
Note 6: Measurement bandwidth is 22Hz to 22kHz.
Note 7: Test performed with a 32Ω resistive load connected to GND. Mode transitions are controlled by SHDN. K
CP
level is calculated
as 20log[(peak voltage during mode transition, no input signal)/(peak voltage under normal operation at rated power level)].
Units are expressed in dB.
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MAX9724DETC+

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Buy MAX9724DETC+
Manufacturer:
Maxim Integrated
Description:
Audio Amplifiers Low RF Susceptible Headphone Amplifier
Lifecycle:
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