MAX9722AETE Maxim Integrated, MAX9722AETE Datasheet

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MAX9722AETE

Manufacturer Part Number
MAX9722AETE
Description
Audio Amplifiers
Manufacturer
Maxim Integrated
Datasheet
1.MAX9722BETE.pdf (21 pages)

Specifications of MAX9722AETE

Product
General Purpose Audio Amplifiers
Output Power
130 mW
Thd Plus Noise
0.01%
Supply Current
5.5 mA
Maximum Power Dissipation
1176 mW
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
Package / Case
TQFN-16
Audio Load Resistance
16 Ohms
Common Mode Rejection Ratio (min)
- 70 dB
Input Offset Voltage
0.5 mV
Minimum Operating Temperature
- 40 C

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0
The MAX9722A/MAX9722B stereo headphone amplifiers
are designed for portable equipment where board space
is at a premium. The MAX9722A/MAX9722B use a
unique DirectDrive architecture to produce a ground-ref-
erenced output from a single supply, eliminating the
need for large DC-blocking capacitors, which saves
cost, board space, and component height. Additionally,
the
(-2V/V, MAX9722B) or adjusted externally (MAX9722A).
The MAX9722A/MAX9722B deliver up to 70mW per
channel into a 16Ω load or 130mW into a 32Ω load and
have low 0.009% THD+N. An 80dB at 217Hz power-sup-
ply rejection ratio (PSRR) allows these devices to operate
from noisy digital supplies without an additional linear
regulator. The MAX9722A/MAX9722B include ±8kV ESD
protection on the headphone outputs. Comprehensive
anticlick-and-pop circuitry suppresses audible clicks
and pops on startup and shutdown. A low-power shut-
down mode reduces the supply current to 0.1µA.
The MAX9722A/MAX9722B operate from a single 2.4V
to 5.5V supply, consume only 5.5mA 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
16-pin thin QFN (3mm
TSSOP packages.
19-3049; Rev 2; 10/07
Note: All devices are specified over the -40°C to +85°C operating
temperature range.
*EP = Exposed paddle.
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.
MAX9722AETE
MAX9722AEUE
MAX9722BETE
MAX9722BEUE
Notebook and
Desktop PCs
MP3 Players
Flat-Panel Monitors
Cellular Phones
PART
gain
Stereo Headphone Amplifiers with Shutdown
of
5V, Differential Input, DirectDrive, 130mW
the
PIN-PACKAGE
16 Thin QFN-EP* (3mm
✕
16 TSSOP
16 Thin QFN-EP* (3mm
✕
16 TSSOP
________________________________________________________________ Maxim Integrated Products
3mm
3mm
Ordering Information
amplifier
General Description
✕
✕
✕
0.8mm)
0.8mm)
3mm
✕
Smart Phones
PDAs
Portable Audio
Equipment
0.8mm) and 16-pin
is
Applications
set
MARK
TOP
AAX
AAY
—
—
internally
T1633-5
T1633-5
CODE
U16-1
U16-1
PKG
♦ 2.4V to 5.5V Single-Supply Operation
♦ High PSRR (80dB at 217Hz) Eliminates LDO
♦ No Bulky DC-Blocking Capacitors Required
♦ Ground-Referenced Outputs Eliminate DC Bias
♦ No Degradation of Low-Frequency Response Due
♦ Differential Inputs for Enhanced Noise
♦ Adjustable Gain (MAX9722A) or Fixed -2V/V Gain
♦ 130mW per Channel into 32Ω
♦ Low 0.009% THD+N
♦ Integrated Click-and-Pop Suppression
♦ Low Quiescent Current (5.5mA)
♦ Short-Circuit and Thermal-Overload Protection
♦ ±8kV ESD-Protected Amplifier Outputs (Human
♦ Available in a Space-Saving 16-Pin Thin QFN
Pin Configurations and Typical Application Circuit appear at
end of data sheet.
Voltage on Headphone Ground Pin
to Output Capacitors
Cancellation
(MAX9722B)
Body Model)
(3mm
AUDIO
AUDIO
INPUT
SHDN
RIGHT
INPUT
LEFT
✕
3mm
✕
0.8mm) Package
Simplified Diagram
MAX9722B
ELIMINATE DC-BLOCKING
FIXED GAIN ELIMINATES
DirectDrive OUTPUTS
EXTERNAL RESISTOR
Features
CAPACITORS.
NETWORK.
1

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MAX9722AETE Summary of contents

Page 1

... TSSOP packages. Notebook and Smart Phones Desktop PCs PDAs MP3 Players Portable Audio Flat-Panel Monitors Equipment Cellular Phones Ordering Information PART PIN-PACKAGE 16 Thin QFN-EP* (3mm MAX9722AETE ✕ 3mm ✕ 0.8mm) MAX9722AEUE 16 TSSOP 16 Thin QFN-EP* (3mm MAX9722BETE ✕ 3mm ✕ 0.8mm) MAX9722BEUE 16 TSSOP Note: All devices are specified over the -40° ...

Page 2

Differential Input, DirectDrive, 130mW Stereo Headphone Amplifiers with Shutdown ABSOLUTE MAXIMUM RATINGS PGND to SGND .....................................................-0.3V to +0.3V PV and SV to PGND or SGND .........................-0. and SV to PGND..........................................+0. ...

Page 3

Differential Input, DirectDrive, 130mW Stereo Headphone Amplifiers with Shutdown ELECTRICAL CHARACTERISTICS (continued) = +5V, PGND = SGND = 0V, SHDN = SV ( MAX9722A gain = -1V 10kΩ), for MAX9722B gain ...

Page 4

Differential Input, DirectDrive, 130mW Stereo Headphone Amplifiers with Shutdown = +5V, PGND = SGND = 0V, SHDN = SV (MAX9722A THD+N measurement bandwidth = 22Hz to 22kHz, T TOTAL HARMONIC DISTORTION PLUS NOISE vs. ...

Page 5

Differential Input, DirectDrive, 130mW Stereo Headphone Amplifiers with Shutdown = +5V, PGND = SGND = 0V, SHDN = SV (MAX9722A THD+N measurement bandwidth = 22Hz to 22kHz, T TOTAL HARMONIC DISTORTION PLUS NOISE vs. ...

Page 6

Differential Input, DirectDrive, 130mW Stereo Headphone Amplifiers with Shutdown = +5V, PGND = SGND = 0V, SHDN = SV (MAX9722A THD+N measurement bandwidth = 22Hz to 22kHz, T POWER-SUPPLY REJECTION RATIO vs. FREQUENCY 0 ...

Page 7

Differential Input, DirectDrive, 130mW Stereo Headphone Amplifiers with Shutdown = +5V, PGND = SGND = 0V, SHDN = SV (MAX9722A THD+N measurement bandwidth = 22Hz to 22kHz, T EXIT SHUTDOWN TRANSIENT MAX9722 toc31 SHDN ...

Page 8

Differential Input, DirectDrive, 130mW Stereo Headphone Amplifiers with Shutdown Detailed Description The MAX9722A/MAX9722B stereo headphone amplifiers feature Maxim’s DirectDrive architecture, eliminating the large output-coupling capacitors required by conven- tional single-supply headphone amplifiers. The devices consist of two class AB ...

Page 9

Differential Input, DirectDrive, 130mW Stereo Headphone Amplifiers with Shutdown Conventional single-supply headphone amplifiers have their outputs biased about a nominal DC voltage (typi- cally half the supply) for maximum dynamic range. Large coupling capacitors are needed to block this ...

Page 10

Differential Input, DirectDrive, 130mW Stereo Headphone Amplifiers with Shutdown LOW-FREQUENCY ROLLOFF (R = 16Ω DirectDrive -6 -9 330μF -12 220μF -15 100μF -18 33μF -21 -24 -27 -30 10 100 1k FREQUENCY (Hz) Figure 4. Low-Frequency ...

Page 11

Differential Input, DirectDrive, 130mW Stereo Headphone Amplifiers with Shutdown The MAX9722A/MAX9722B feature shutdown control allowing audio signals to be shut down or muted. Driving SHDN low disables the amplifiers and the charge pump, sets the amplifier output impedance to ...

Page 12

Differential Input, DirectDrive, 130mW Stereo Headphone Amplifiers with Shutdown Component Selection The input capacitor ( conjunction with the input IN resistor (R ), forms a highpass filter that removes the DC IN bias from an incoming signal ...

Page 13

Differential Input, DirectDrive, 130mW Stereo Headphone Amplifiers with Shutdown MAX9722A LEFT AUDIO INPUT SHDN RIGHT AUDIO INPUT Figure 8. Common-Mode Sense Input Eliminates Ground-Loop Noise EXAMPLE CONNECTION: V IMPROVEMENT FROM ADDING MAX9722 WITH SERIES RESISTANCE V AUDIO Figure 9. ...

Page 14

Differential Input, DirectDrive, 130mW Stereo Headphone Amplifiers with Shutdown such as the headphone socket used as a line output to a home hi-fi system. In the upper diagram, any differ- ence between the two GND references (represented by V ...

Page 15

Differential Input, DirectDrive, 130mW Stereo Headphone Amplifiers with Shutdown TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY -1V OUT(P-P) 1 OUTPUTS DRIVING PIEZOELECTRIC SPEAKER 0.1 0.01 0.001 0.0001 10 ...

Page 16

Differential Input, DirectDrive, 130mW Stereo Headphone Amplifiers with Shutdown 0.1μF AUX_IN MAX4060 BIAS 2.2kΩ 0.1μF IN+ IN- 0.1μF The thin QFN package features an exposed paddle that improves thermal efficiency of the package. The MAX9722A/MAX9722B do not require additional ...

Page 17

Differential Input, DirectDrive, 130mW Stereo Headphone Amplifiers with Shutdown 2.4V TO 5.5V C3 1μ (11, 15) ( SHUTDOWN (4) CONTROL C1P CHARGE C1 PUMP 1μF 4 (6) C1N PV SV PGND ...

Page 18

Differential Input, DirectDrive, 130mW Stereo Headphone Amplifiers with Shutdown TOP VIEW INL+ 1 SHDN MAX9722A 4 C1P MAX9722B PGND 5 C1N SGND 8 TSSOP Chip Information TRANSISTOR COUNT: 1100 PROCESS: BiCMOS ...

Page 19

Differential Input, DirectDrive, 130mW Stereo Headphone Amplifiers with Shutdown (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information www.maxim-ic.com/packages.) ______________________________________________________________________________________ Package Information PACKAGE OUTLINE, TSSOP 4.40mm ...

Page 20

Differential Input, DirectDrive, 130mW Stereo Headphone Amplifiers with Shutdown (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information www.maxim-ic.com/packages.) E MARKING E/2 AAAA D ...

Page 21

... 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 ____________________ 21 © 2007 Maxim Integrated Products ...

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