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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX9724B Datasheet

(MAX9724A/B) Stereo Headphone Amplifier

No Preview Available !

19-3597; Rev 6; 3/09
EVAALVUAAILTAIOBNLEKIT
60mW, DirectDrive, Stereo Headphone Amplifier
with Low RF Susceptibility and Shutdown
General Description
The MAX9724A/MAX9724B 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 MAX9724A
offers an externally adjustable gain while the
MAX9724B has an internally preset gain of -1.5V/V. The
MAX9724A/MAX9724B 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 MAX9724A/MAX9724B operate from a single 2.7V
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
Cellular Phones
DVD Players
MP3 Players
Smart Phones
Notebook PCs
PDAs
Handheld Gaming Consoles
DirectDrive is a registered trademark of Maxim Integrated
Products, Inc.
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 (MAX9724A) or Fixed -1.5V/V
Gain (MAX9724B)
Low 0.02% THD+N
High PSRR (80dB at 1kHz) Eliminates LDO
Integrated Click-and-Pop Suppression
2.7V 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)
Ordering Information
PART
GAIN PIN-
(V/V) PACKAGE
TOP
MARK
MAX9724AEBC+TG45 Adj. 12 UCSP
+ADH
MAX9724AETC+
Adj. 12 TQFN-EP* +AAT
MAX9724BEBC+TG45 -1.5 12 UCSP
+ADI
MAX9724BETC+
-1.5 12 TQFN-EP* +AAU
Note: All devices specified over the -40°C to +85°C operating
range.
+Denotes lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
*EP = Exposed paddle.
Pin Configurations appear at end of data sheet.
UCSP is a trademark of Maxim Integrated Products, Inc.
Block Diagrams
LEFT
AUDIO
INPUT
SHDN
RIGHT
AUDIO
INPUT
MAX9724A
DirectDrive OUTPUTS
ELIMINATE DC-BLOCKING
CAPACITORS
LEFT
AUDIO
INPUT
SHDN
RIGHT
AUDIO
INPUT
MAX9724B
DirectDrive OUTPUTS
ELIMINATE DC-BLOCKING
CAPACITORS
FIXED GAIN ELIMINATES
EXTERNAL RESISTOR
NETWORK
________________________________________________________________ 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.


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX9724B Datasheet

(MAX9724A/B) Stereo Headphone Amplifier

No Preview Available !

60mW, DirectDrive, Stereo Headphone Amplifier
with Low RF Susceptibility and Shutdown
ABSOLUTE MAXIMUM RATINGS
VDD 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 (VDD + 0.3V)
C1N to PGND............................................(PVSS - 0.3V) to +0.3V
PVSS and SVSS to PGND..........................................-6V to +0.3V
IN_ to SGND (MAX9724A)..........................-0.3V to (VDD + 0.3V)
IN_ to SGND (MAX9724B) .............(SVSS - 0.3V) to (VDD + 0.3V)
OUT_ to SVSS (Note 1) ....-0.3V to Min (VDD - SVSS + 0.3V, +9V)
OUT_ to VDD (Note 2) ......+0.3V to Max (SVSS - VDD - 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 (TA = +70°C, Multilayer board)
12-Bump UCSP (derate 6.5mW/°C above +70°C) ........519mW
θJA ................................................................................154 C/W
12-Pin TQFN (derate 16.7mW/°C above +70°C) .........1333mW
θJA ..................................................................................60°C/W
θJC..................................................................................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
Note 1: OUTR and OUTL should be limited to no more than 9V above SVSS, or above VDD + 0.3V, whichever limits first.
Note 2: OUTR and OUTL should be limited to no more than 9V below VDD, or below SVSS - 0.3V, whichever limits first.
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
(VDD = 5V, PGND = SGND, SHDN = 5V, C1 = C2 = 1µF, RL = , resistive load reference to ground; for MAX9724A gain = -1.5V/V
(RIN = 20kΩ, RF = 30kΩ); for MAX9724B gain = -1.5V/V (internally set), TA = -40°C to +85°C, unless otherwise noted. Typical values
are at TA = +25°C, unless otherwise noted.) (Note 3)
PARAMETER
GENERAL
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
Supply Voltage Range
Quiescent Current
Shutdown Current
Shutdown to Full Operation
Input Impedance
Output Offset Voltage
Power-Supply Rejection Ratio
Output Power (TQFN)
Output Power (UCSP)
Voltage Gain
Channel-to-Channel Gain Tracking
VDD
ICC
ISHDN
tSON
RIN
VOS
PSRR
POUT
POUT
AV
Guaranteed by PSRR test
SHDN = SGND = PGND
MAX9724B, measured at IN_
(Note 4)
VDD = 2.7V to 5.5V, TA = +25°C
f = 1kHz, 100mVP-P (Note 4)
f = 20kHz, 100mVP-P (Note 4)
RL = 32Ω, THD+N = 1%
RL = 16Ω, THD+N = 1%
RL = 32Ω, THD+N = 1%
RL = 16Ω, THD+N = 1%
MAX9724B (Note 5)
MAX9724B
2.7
12
69
30
25
-1.52
3.5
0.1
180
19
±1.5
86
80
65
63
42
45
35
-1.5
±0.15
5.5
5.5
1
28
±10
-1.48
V
mA
µA
µs
kΩ
mV
dB
mW
mW
V/V
%
Total Harmonic Distortion Plus
Noise (TQFN) (Note 6)
Total Harmonic Distortion Plus
Noise (UCSP) (Note 6)
Signal-to-Noise Ratio
THD+N
THD+N
SNR
RL = 1kΩ, VOUT = 2VRMS, fIN = 1kHz
RL = 32Ω, POUT = 50mW, fIN = 1kHz
RL = 16Ω, POUT = 35mW, fIN = 1kHz
RL = 1kΩ, VOUT = 2VRMS, fIN = 1kHz
RL = 32Ω, POUT = 45mW, fIN = 1kHz
RL = 16Ω, POUT = 32mW, fIN = 1kHz
RL = 1kΩ,
VOUT = 2VRMS
BW = 22Hz to 22kHz
A-weighted
RL = 32Ω,
POUT = 50mW
BW = 22Hz to 22kHz
A-weighted
0.003
0.02
0.04
0.003
0.03
0.05
102
105
98
101
%
%
dB
2 _______________________________________________________________________________________


Part Number MAX9724B
Description (MAX9724A/B) Stereo Headphone Amplifier
Maker Maxim Integrated Products
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MAX9724B Datasheet PDF






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