MAX9705DETB+

更新时间： 2024-09-24 13:11:07

品牌	Logo	应用领域
美信 - MAXIM		音频放大器
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20页	2358K
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MAX9705DETB+ 数据手册

19-3405; Rev 0; 7/05

2.3W, Ultra-Low-EMI, Filterless,

Class D Audio Amplifier

General Description

Features

♦ Filterless Amplifier Passes FCC-Radiated

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.

Emissions Standards with 24in of Cable

♦ Unique Spread-Spectrum Mode and Active

Emissions Limiting (AEL) Achieves Better than

20dB Margin Under FCC Limits

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

of-the-Art Efficiency and THD+N

♦ Simple Master-Slave Setup for Stereo Operation

♦ Up to 90% Efficiency

♦ 2.3W into 4Ω (1% THD+N)

♦ Low 0.02% THD+N (P

= 1W, V

= 5.0V)

OUT

♦ 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

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.

♦ Available in Thermally Efficient, Space-Saving

Packages

10-Pin TDFN (3mm x 3mm x 0.8mm)

10-Pin µMAX

12-Bump UCSP (1.5mm x 2mm x 0.6mm)

♦ Pin-for-Pin Compatible with the MAX9700 and

MAX9712

Ordering Information

PIN-

PACKAGE

TOP

MARK

PART

TEMP RANGE

MAX9705AETB+T

MAX9705AEUB+

MAX9705AEBC+T

MAX9705BETB+T

MAX9705BEUB+

MAX9705BEBC+T

-40^oC to +85^oC 10 TDFN-10

-40^oC to +85^oC 10 µMAX

-40^oC to +85^oC 12 UCSP-12

-40^oC to +85^oC 10 TDFN-10

-40^oC to +85^oC 10 µMAX

-40^oC to +85^oC 12 UCSP-12

ACY

—

The MAX9705 is available in 10-pin TDFN (3mm x 3mm x

ACH

ACX

—

0.8mm), 10-pin µMAX , 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.

ACG

Ordering Information continued at end of data sheet.

+Denotes lead-free package.

Applications

EMI Spectrum Diagram

Cellular Phones

PDAs

MP3 Players

Portable Audio

50.0

45.0

40.0

FCC EMI LIMIT

35.0

30.0

25.0

20.0

15.0

10.0

5.0

Selector Guide appears at end of data sheet.

MAXIM'S NEW ULTRA-LOW

OUTPUT SPECTRUM

30.0

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

FREQUENCY (MHz)

µMAX is a registered trademark and UCSP is a trademark of

Maxim Integrated Products, Inc.

________________________________________________________________ Maxim Integrated Products

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

12 3 4 5 6 7...20

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MAX9705DETB+ 替代型号

型号	品牌	替代类型	描述	数据表
MAX9705DETB+T	MAXIM	功能相似	2.3W, Ultra-Low-EMI, Filterless, Class D Audio Amplifier

与MAX9705DETB+相关器件

型号	品牌	获取价格	描述	数据表
MAX9705DETB+T	MAXIM	获取价格	2.3W, Ultra-Low-EMI, Filterless, Class D Audio Amplifier
MAX9705DEUB+	MAXIM	获取价格	2.3W, Ultra-Low-EMI, Filterless, Class D Audio Amplifier
MAX9706	MAXIM	获取价格	3-Channel, 2.3W, Filterless Class D Amplifiers with Active Crossover
MAX9706ETX+	MAXIM	获取价格	3-Channel, 2.3W, Filterless Class D Amplifiers with Active Crossover
MAX9707	MAXIM	获取价格	3-Channel, 2.3W, Filterless Class D Amplifiers with Active Crossover
MAX9707ETX+	MAXIM	获取价格	3-Channel, 2.3W, Filterless Class D Amplifiers with Active Crossover
MAX9708	MAXIM	获取价格	20W/40W, Filterless, Spread-Spectrum, Mono/Stereo, Class D Amplifier
MAX9708	ADI	获取价格	20W/40W、无需滤波的扩频单声道/立体声D类放大器
MAX9708_13	MAXIM	获取价格	20W/40W, Filterless, Spread-Spectrum, Mono/Stereo, Class D Amplifier
MAX9708ECB	MAXIM	获取价格	20W/40W, Filterless, Spread-Spectrum, Mono/Stereo, Class D Amplifier

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