MAX9724AETC+ Maxim Integrated Products, MAX9724AETC+ Datasheet

IC AMP AUDIO .045W STER 12TQFN

MAX9724AETC+

Manufacturer Part Number
MAX9724AETC+
Description
IC AMP AUDIO .045W STER 12TQFN
Manufacturer
Maxim Integrated Products
Series
DirectDrive™r
Type
Class ABr
Datasheet
1.MAX9724AETC.pdf (19 pages)

Specifications of MAX9724AETC+

Output Type
Headphones, 2-Channel (Stereo)
Max Output Power X Channels @ Load
63mW x 2 @ 32 Ohm
Voltage - Supply
2.7 V ~ 5.5 V
Features
Depop, Short-Circuit and Thermal Protection, Shutdown
Mounting Type
Surface Mount
Package / Case
12-TQFN Exposed Pad
Product
General Purpose Audio Amplifiers
Output Power
42 mW
Thd Plus Noise
0.02 %
Supply Current
3.5 mA
Maximum Power Dissipation
1333 mW
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
Audio Load Resistance
16 Ohms
Minimum Operating Temperature
- 40 C
Amplifier Class
AB
No. Of Channels
2
Supply Voltage Range
2.7V To 5.5V
Load Impedance
16ohm
Operating Temperature Range
-40°C To +85°C
Amplifier Case Style
TQFN
Rohs Compliant
Yes
For Use With
MAX9724AEVKIT+ - EVALUATION KIT FOR MAX9724A/BMAX9724DEVKIT+ - KIT EVAL FOR MAX9724D
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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
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.
19-3597; Rev 6; 3/09
DirectDrive is a registered trademark of Maxim Integrated
Products, Inc.
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.
60mW, DirectDrive, Stereo Headphone Amplifier
Cellular Phones
MP3 Players
Notebook PCs
Handheld Gaming Consoles
®
AUDIO
AUDIO
INPUT
RIGHT
INPUT
architecture to produce a ground-refer-
LEFT
with Low RF Susceptibility and Shutdown
________________________________________________________________ Maxim Integrated Products
SHDN
General Description
MAX9724A
Applications
DVD Players
Smart Phones
PDAs
ELIMINATE DC-BLOCKING
DirectDrive OUTPUTS
CAPACITORS
♦ Improved RF Noise Rejection (Up to 67dB Over
♦ No Bulky DC-Blocking Capacitors Required
♦ Low-Power Shutdown Mode, < 0.1μA
♦ Adjustable Gain (MAX9724A) or Fixed -1.5V/V
♦ 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
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.
MAX9724AEBC+TG45
MAX9724AETC+
MAX9724BEBC+TG45
MAX9724BETC+
Typical Amplifiers)
Gain (MAX9724B)
AUDIO
AUDIO
INPUT
RIGHT
INPUT
SHDN
LEFT
12-Bump UCSP (1.5mm x 2mm)
12-Pin Thin QFN (3mm x 3mm x 0.8mm)
PART
MAX9724B
Ordering Information
GAIN
(V/V)
Adj.
Adj.
-1.5
-1.5
Block Diagrams
FIXED GAIN ELIMINATES
ELIMINATE DC-BLOCKING
EXTERNAL RESISTOR
DirectDrive OUTPUTS
PIN-
PACKAGE
12 UCSP
12 TQFN-EP*
12 UCSP
12 TQFN-EP*
CAPACITORS
NETWORK
Features
MARK
+ADH
+AAU
+AAT
+ADI
TOP
1

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MAX9724AETC+ Summary of contents

Page 1

... 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) PART MAX9724AEBC+TG45 MAX9724AETC+ MAX9724BEBC+TG45 MAX9724BETC+ Note: All devices specified over the -40°C to +85°C operating range. Applications + Denotes lead(Pb)-free/RoHS-compliant package. ...

Page 2

DirectDrive, Stereo Headphone Amplifier with Low RF Susceptibility and Shutdown ABSOLUTE MAXIMUM RATINGS V to GND ..............................................................-0. .........................................................-0.3V to +0. PGND to SGND .....................................................-0.3V to +0.3V C1P to PGND..............................................-0. ...

Page 3

DirectDrive, Stereo Headphone Amplifier with Low RF Susceptibility and Shutdown ELECTRICAL CHARACTERISTICS (continued) = 5V, PGND = SGND, SHDN = 5V 1µ 20kΩ 30kΩ); for MAX9724B gain = ...

Page 4

DirectDrive, Stereo Headphone Amplifier with Low RF Susceptibility and Shutdown = 5V, PGND = SGND = 0V, SHDN = THD+N measurement bandwidth = 22Hz to 22kHz, both outputs driven in phase, T TOTAL HARMONIC DISTORTION PLUS ...

Page 5

DirectDrive, Stereo Headphone Amplifier with Low RF Susceptibility and Shutdown = 5V, PGND = SGND = 0V, SHDN = THD+N measurement bandwidth = 22Hz to 22kHz, both outputs driven in phase, T TOTAL HARMONIC DISTORTION PLUS ...

Page 6

DirectDrive, Stereo Headphone Amplifier with Low RF Susceptibility and Shutdown = 5V, PGND = SGND = 0V, SHDN = THD+N measurement bandwidth = 22Hz to 22kHz, both outputs driven in phase, T OUTPUT POWER vs. SUPPLY ...

Page 7

DirectDrive, Stereo Headphone Amplifier with Low RF Susceptibility and Shutdown = 5V, PGND = SGND = 0V, SHDN = THD+N measurement bandwidth = 22Hz to 22kHz, both outputs driven in phase, T CROSSTALK vs. FREQUENCY 0 ...

Page 8

DirectDrive, Stereo Headphone Amplifier with Low RF Susceptibility and Shutdown = 5V, PGND = SGND = 0V, SHDN = THD+N measurement bandwidth = 22Hz to 22kHz, both outputs driven in phase, T EXITING SHUTDOWN V SHDN ...

Page 9

DirectDrive, Stereo Headphone Amplifier with Low RF Susceptibility and Shutdown Detailed Description The MAX9724A/MAX9724B stereo headphone ampli- fiers feature Maxim’s DirectDrive architecture, eliminat- ing the large output-coupling capacitors required by conventional single-supply headphone amplifiers. The device consists of two ...

Page 10

DirectDrive, Stereo Headphone Amplifier with Low RF Susceptibility and Shutdown the MAX9724 addresses the problem of the RF suscep- tibility by rejecting RF noise and preventing it from cou- pling into the audio band. The RF susceptibility of an ...

Page 11

DirectDrive, Stereo Headphone Amplifier with Low RF Susceptibility and Shutdown °C/W as specified in the Absolute Maximum Ratings section. For example, θ of the thin QFN package is JA +68°C/W, and 154.2°C/W for the UCSP package. The MAX9724A/MAX9724B have ...

Page 12

DirectDrive, Stereo Headphone Amplifier with Low RF Susceptibility and Shutdown pump’s load regulation and output resistance value that is too small degrades the device’s ability to provide sufficient current drive, which leads to a loss of output ...

Page 13

DirectDrive, Stereo Headphone Amplifier with Low RF Susceptibility and Shutdown Lineout Amplifier and Filter Block The MAX9724A can be used as an audio line driver capable of providing 2V into 10kΩ loads with a sin- RMS gle 5V supply ...

Page 14

DirectDrive, Stereo Headphone Amplifier with Low RF Susceptibility and Shutdown To suppress this noise, and to provide a 2V dard audio output level from a single 5V supply, the MAX9724A can be configured as a line driver and active ...

Page 15

DirectDrive, Stereo Headphone Amplifier with Low RF Susceptibility and Shutdown μCONTROLLER STEREO DAC ______________________________________________________________________________________ V DD 0.1μF 15kΩ 1μF 15kΩ INR OUTR OUTR- BIAS 1μF MAX9710 GND PGND MUTE OUTL- 0.1μF SHDN 15kΩ OUTL+ INL ...

Page 16

DirectDrive, Stereo Headphone Amplifier with Low RF Susceptibility and Shutdown 2.7V TO 5.5V C3 1μF 12 (B1 (C1) C1P CHARGE C1 PUMP 1μF 3 (C3) C1N (C4) (B4) C2 1μF *R ...

Page 17

DirectDrive, Stereo Headphone Amplifier with Low RF Susceptibility and Shutdown Functional Diagram/Typical Operating Circuits (continued) 2.7V TO 5.5V C3 OFF 1μF 12 (B1 (C1) C1P CHARGE C1 PUMP 1μF 3 (C3) C1N SV PV PGND SS ...

Page 18

DirectDrive, Stereo Headphone Amplifier with Low RF Susceptibility and Shutdown TOP VIEW 9 8 OUTR 10 MAX9724A 11 OUTL MAX9724B TQFN Chip Information PROCESS: BiCMOS 18 ______________________________________________________________________________________ TOP VIEW (BUMPS ON BOTTOM) 7 ...

Page 19

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 19 © 2009 Maxim Integrated Products DESCRIPTION Maxim is a registered trademark of Maxim Integrated Products, Inc ...

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