MAX9705 Maxim Integrated Products, MAX9705 Datasheet

MAX9705

Manufacturer Part Number

MAX9705

Description

2.3W Ultra-Low-EMI Filterless Class D Audio Amplifier

Manufacturer

Maxim Integrated Products

Datasheet

1.MAX9705.pdf (18 pages)

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Part Number

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Price

Company:

Bonase Electronics (HK) Co., Limited

Part Number:

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Part Number:

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Part Number:

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Company:

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Part Number:

MAX9705BETB+T

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Current page: 1 of 18
Download datasheet (507Kb)

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 patented spread-

spectrum modulation scheme eliminates the need for out-

put filtering 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

o Filterless Amplifier Passes FCC-Radiated

o Unique Spread-Spectrum Mode and Active

o Zero Dead Time (ZDT) H-Bridge Maintains State-

o Simple Master-Slave Setup for Stereo Operation

o Up to 90% Efficiency

o 2.3W into 4Ω (1% THD+N)

o Low 0.02% THD+N (P

o High PSRR (75dB at 217Hz)

o Integrated Click-and-Pop Suppression

o Low Quiescent Current (5.4mA)

o Low-Power Shutdown Mode (0.3µA)

o Short-Circuit and Thermal-Overload Protection

o Available in Thermally Efficient, Space-Saving

o 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

Ordering Information

MAXIM'S NEW ULTRA-LOW

OUTPUT SPECTRUM

C to +85

FREQUENCY (MHz)

OUT

= 1W, V

www.DataSheet4U.com

PIN-

PACKAGE

10 TDFN

12 UCSP

10 TDFN

12 UCSP

FCC EMI LIMIT

= 5.0V)

Features

MARK

ACG

TOP

ACY

ACH

ACX

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