MAX9705AETB/V+T Maxim Integrated, MAX9705AETB/V+T Datasheet

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MAX9705AETB/V+T

Manufacturer Part Number
MAX9705AETB/V+T
Description
Audio Amplifiers 2.3W Ultra-Low-EMI Filterless Class D Audio Amplifier
Manufacturer
Maxim Integrated
Datasheet

Specifications of MAX9705AETB/V+T

Product
Class-D
Output Power
950 mW
Thd Plus Noise
0.02 %
Supply Current
5.4 mA
Maximum Power Dissipation
1951.2 mW
Audio Load Resistance
4 Ohms
Common Mode Rejection Ratio (min)
56 dB
The MAX9705 3rd-generation, ultra-low EMI, mono, Class
D audio power amplifier provides Class AB performance
with Class D efficiency. The MAX9705 delivers 2.3W into
a 4Ω load and offers efficiencies above 85%. Active
emissions limiting (AEL) circuitry greatly reduces EMI by
actively controlling the output FET gate transitions under
all possible transient output-voltage conditions. AEL pre-
vents high-frequency emissions resulting from conven-
tional Class D free-wheeling behavior in the presence of
an inductive load. Zero dead time (ZDT) technology
maintains state-of-the-art efficiency and THD+N perfor-
mance by allowing the output FETs to switch simultane-
ously without cross-conduction. A spread-spectrum
modulation scheme eliminates the need for output filter-
ing found in traditional Class D devices. These design
concepts reduce an application’s component count and
extend battery life.
The MAX9705 offers two modulation schemes: a fixed-
frequency (FFM) mode and a spread-spectrum (SSM)
mode that further reduces EMI-radiated emissions due to
the modulation frequency. The MAX9705 oscillator can
be synchronized to an external clock through the SYNC
input, allowing the switching frequency to be externally
defined. The SYNC input also allows multiple MAX9705s
to be cascaded and frequency locked, minimizing inter-
ference due to clock intermodulation. The device utilizes
a fully differential architecture, a full-bridged output, and
comprehensive click-and-pop suppression. The gain of
the MAX9705 is set internally (MAX9705A: 6dB,
MAX9705B: 12dB, MAX9705C: 15.6dB, MAX9705D:
20dB), further reducing external component count.
The MAX9705 is available in 10-pin TDFN (3mm x 3mm x
0.8mm), and 12-bump UCSP™ (1.5mm x 2mm x 0.6mm)
packages. The MAX9705 is specified over the extended
-40°C to +85°C temperature range.
19-3405; Rev 3; 5/09
Selector Guide appears at end of data sheet.
UCSP is a 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.
Cellular Phones
PDAs
________________________________________________________________ Maxim Integrated Products
General Description
MP3 Players
Portable Audio
Applications
2.3W, Ultra-Low-EMI, Filterless,
Class D Audio Amplifier
♦ Filterless Amplifier Passes FCC-Radiated
♦ Unique Spread-Spectrum Mode and Active
♦ Zero Dead Time (ZDT) H-Bridge Maintains State-
♦ Simple Master-Slave Setup for Stereo Operation
♦ Up to 90% Efficiency
♦ 2.3W into 4Ω (1% THD+N)
♦ Low 0.02% THD+N (P
♦ High PSRR (75dB at 217Hz)
♦ Integrated Click-and-Pop Suppression
♦ Low Quiescent Current (5.4mA)
♦ Low-Power Shutdown Mode (0.3µA)
♦ Short-Circuit and Thermal-Overload Protection
♦ Available in Thermally Efficient, Space-Saving
♦ Pin-for-Pin Compatible with the MAX9700 and
Ordering Information continued at end of data sheet.
+ Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
MAX9705AETB+T
MAX9705AEBC+T
MAX9705BETB+T
MAX9705BEBC+T
Emissions Standards with 24in of Cable
Emissions Limiting (AEL) Achieves Better than
20dB Margin Under FCC Limits
of-the-Art Efficiency and THD+N
Packages
MAX9712
50.0
45.0
40.0
35.0
30.0
25.0
20.0
15.0
10.0
5.0
10-Pin TDFN (3mm x 3mm x 0.8mm)
12-Bump UCSP (1.5mm x 2mm x 0.6mm)
30.0
PART
60.0 80.0 100.0 120.0 140.0 160.0 180.0 200.0 220.0 240.0 260.0 280.0 300.0
EMI Spectrum Diagram
TEMP RANGE
-40
-40
-40
-40
Ordering Information
MAXIM'S NEW ULTRA-LOW
OUTPUT SPECTRUM
o
o
o
o
C to +85
C to +85
C to +85
C to +85
FREQUENCY (MHz)
OUT
= 1W, V
o
o
o
o
C
C
C
C
PIN-
PACKAGE
10 TDFN
12 UCSP
10 TDFN
12 UCSP
DD
FCC EMI LIMIT
= 5.0V)
Features
MARK
ACG
TOP
ACY
ACH
ACX
1

Related parts for MAX9705AETB/V+T

MAX9705AETB/V+T Summary of contents

Page 1

... Cellular Phones MP3 Players PDAs Portable Audio Selector Guide appears at end of data sheet. UCSP is a trademark of Maxim Integrated Products, Inc. ________________________________________________________________ Maxim Integrated Products 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. 2.3W, Ultra-Low-EMI, Filterless, Class D Audio Amplifier ♦ ...

Page 2

Ultra-Low-EMI, Filterless, Class D Audio Amplifier ABSOLUTE MAXIMUM RATINGS V to GND.............................................................................. PGND .........................................................................6V DD GND to PGND .......................................................-0.3V to +0. ..........................................................-0.3V to +0. All Other Pins to GND.................................-0. ...

Page 3

ELECTRICAL CHARACTERISTICS (continued 3.3V, V SHDN DD DD GND unless otherwise noted. Typical values are MIN MAX PARAMETER SYMBOL Rise/Fall Time t RISE Signal-to-Noise Ratio ...

Page 4

Ultra-Low-EMI, Filterless, Class D Audio Amplifier (V = 3.3V, SYNC = V (SSM), differential input load condition apply to the MAX9705_ETB+T only.) TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT POWER 100 f = 1kHz IN 10 ...

Page 5

SYNC = V (SSM), differential input load condition apply to the MAX9705_ETB+T only.) TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY 100 4Ω 100mW OUT ...

Page 6

Ultra-Low-EMI, Filterless, Class D Audio Amplifier (V = 3.3V, SYNC = V (SSM), differential input load condition apply to the MAX9705_ETB+T only.) OUTPUT POWER vs. SUPPLY VOLTAGE 2.0 1.8 1.6 1.4 THD+N = 10% 1.2 1.0 ...

Page 7

SYNC = V (SSM), differential input load condition apply to the MAX9705_ETB+T only.) WIDEBAND OUTPUT SPECTRUM FIXED-FREQUENCY MODE 0 -20 -40 -60 -80 -100 R = 8Ω 5.0V -120 DD INPUTS ...

Page 8

Ultra-Low-EMI, Filterless, Class D Audio Amplifier 2.5V TO 5.5V 1µF 5 (B2) SHDN 2 1µF (B1) IN+ 3 1µF (C1) IN- PGND 7 (B3 UCSP BUMP. FIGURE SHOWS MAX9705 CONFIGURED FOR SPREAD-SPECTRUM OPERATION. 8 _______________________________________________________________________________________ 1 10 ...

Page 9

PIN BUMP NAME TDFN UCSP GND SHDN SYNC 7 B3 PGND 8 A4 OUT OUT — — Detailed Description The MAX9705 ultra-low-EMI, filterless, ...

Page 10

Ultra-Low-EMI, Filterless, Class D Audio Amplifier V IN- V IN+ OUT- OUT+ t ON(MIN OUT+ OUT- Figure 1. MAX9705 Outputs with an Input Signal Applied Table 1. Operating Modes SYNC INPUT MODE GND FFM with f ...

Page 11

V IN- V IN+ OUT- OUT+ t ON(MIN OUT+ OUT- Figure 2. MAX9705 Output with an Input Signal Applied (SSM Mode) Filterless Modulation/Common-Mode Idle The MAX9705 uses Maxim’s unique modulation scheme that eliminates the LC filter required ...

Page 12

Ultra-Low-EMI, Filterless, Class D Audio Amplifier OUT- OUT+ V OUT OUT Figure 3. MAX9705 Outputs with No Input Signal Click-and-Pop Suppression The MAX9705 features comprehensive click-and-pop suppression that eliminates audible transients ...

Page 13

Note that the single-ended voltage range of the MAX9705A This limits the achievable output P-P power for this device. Use higher gain versions (MAX9705B, MAX9705C, MAX9705D) if higher output power is desired in a single-ended application. The ...

Page 14

Ultra-Low-EMI, Filterless, Class D Audio Amplifier 1µF RIGHT-CHANNEL DIFFERENTIAL AUDIO INPUT 1µF LEFT-CHANNEL DIFFERENTIAL AUDIO INPUT Figure 6. Master-Slave Stereo Configuration TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT POWER 100 V = 3.3V DD SLAVE DEVICE f = 1kHz ...

Page 15

CW 1µF 50kΩ 1µF Figure 9a. Single-Ended Drive of MAX9705 Plus Volume Pin Configurations TOP VIEW MAX9705 + TDFN TOP VIEW MAX9705 (BUMP SIDE DOWN SYNC DD A ...

Page 16

Ultra-Low-EMI, Filterless, Class D Audio Amplifier V DD 0.1µF AUX_IN 2.2kΩ BIAS 2.2kΩ MAX4063 0.1µF IN+ IN- 0.1µF 16 ______________________________________________________________________________________ V DD 1µ IN+ MAX9705 IN- OUT SHDN CODEC/ OUT BASEBAND PROCESSOR SHDN 1µF INL 1µF MAX9722 ...

Page 17

Chip Information PROCESS: BiCMOS ______________________________________________________________________________________ 2.3W, Ultra-Low-EMI, Filterless, Class D Audio Amplifier For the latest package outline information and land patterns www.maxim-ic.com/packages. Note that a "+", "#", or "-" in the package code indicates RoHS status only. Package ...

Page 18

... 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. 18 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2009 Maxim Integrated Products ...

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