MAX9720

更新时间： 2024-09-15 22:25:31

品牌	Logo	应用领域
美信 - MAXIM		放大器
页数	文件大小	规格书
21页	507K
描述
50mW, DirectDrive, Stereo Headphone Amplifier with SmartSense and Shutdown

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MAX9720 数据手册

19-2859; Rev 0; 4/03

50mW, DirectDrive, Stereo Headphone

Amplifier with SmartSense and Shutdown

General Description

Features

The MAX9720 stereo headphone amplifier combines

Maxim’s patented DirectDrive architecture and

SmartSense™, an automatic mono/stereo detection fea-

ture. Conventional headphone amplifiers require a bulky

DC-blocking capacitor between the headphone and the

amplifier. DirectDrive produces a ground-referenced out-

put from a single supply, eliminating the need for large

DC-blocking capacitors, saving cost, board space, and

component height.

ꢀ DirectDrive Eliminates Bulky DC-Blocking

Capacitors

ꢀ SmartSense Automatic Short Detection

ꢀ Low 5mA Quiescent Current

ꢀ Fixed Gain Eliminates External Feedback Network

MAX9720A: -1V/V

MAX9720B: -1.41V/V

ꢀ 50mW per Channel Output Power

ꢀ Ultra-Low 0.003% THD+N

SmartSense automatically detects the presence of a

short at either the left or right amplifier output. Under a

fault condition, the shorted output is automatically dis-

abled and the stereo input signal is automatically mixed

and routed to the remaining active channel. This feature

is useful in cell phone and PDA applications where a

variety of headphone jacks with unknown loads can be

inserted into the headphone jack socket. SmartSense

prevents both damage to the amplifier and eliminates

battery drain into a shorted load.

ꢀ High PSRR (92dB at 217Hz)

ꢀ Integrated Click-and-Pop Suppression

ꢀ 1.8V to 3.6V Single-Supply Operation

ꢀ Thermal Overload Protection

ꢀ Available in Space-Saving Packages

16-Bump UCSP (2mm x 2mm x 0.6mm)

16-Pin TSSOP

The MAX9720 delivers up to 50mW per channel into a

16Ω load and has an ultra-low 0.003% THD+N. A high

(92dB at 217kHz) power-supply rejection ratio (PSRR)

allows the device to operate from noisy digital supplies

without additional power conditioning. The gain of the

MAX9720 is set internally, further reducing component

count. Two gain options are available (-1V/V, MAX9720A

and -1.41V/V, MAX9720B). The headphone outputs

include a comprehensive click-and-pop circuitry that

eliminates audible glitches on startup and shutdown. A

shutdown mode provides a fast 250µs turn-on time.

Ordering Information

PIN/BUMP-

PACKAGE

GAIN

(V/V)

PART

TEMP RANGE

MAX9720AEBE-T -40^oC to +85^oC

MAX9720BEBE-T -40^oC to +85^oC

16 UCSP-16

16 TSSOP

-1

-1.41

-1

MAX9720AEUE

MAX9720BEUE

-40^oC to +85^oC

16 TSSOP

-1.41

The MAX9720 operates from a single 1.8V to 3.6V

supply and consumes only 5mA of supply current. The

MAX9720 also features thermal overload protection,

and is specified over the extended -40°C to +85°C tem-

perature range. The MAX9720 is available in a tiny

(2mm x 2mm x 0.6mm) 16-bump chip-scale package

(UCSP™) and a 16-pin TSSOP package.

Simplified Block Diagram

3.6V TO 1.8V

SUPPLY

Applications

MAX9720

PDAs

Smart Phones

OUT

Cellular Phones

MP3 Players

Notebook PCs

Tablet PCs

HPS

Portable Audio Equipment

MODE1

MODE2

ALERT

SmartSense

OUT

SmartSense and UCSP are trademarks of Maxim Integrated

Products, Inc.

Pin Configuration and Typical Application Circuit appear at

end of data sheet.

________________________________________________________________ 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.

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与MAX9720相关器件

型号	品牌	获取价格	描述	数据表
MAX97200	MAXIM	获取价格	Low-Power, Low-Offset, Dual Mode, Class H DirectDrive Headphone Amplifier
MAX97200	ADI	获取价格	低功耗、低失调、双模H类DirectDrive耳机放大器
MAX97200_11	MAXIM	获取价格	Low-Power, Low-Offset, Dual Mode, Class H DirectDrive Headphone Amplifier
MAX97200_12	MAXIM	获取价格	Low-Power, Low-Offset, Dual Mode, Class H DirectDrive Headphone Amplifier
MAX97200AEWC	MAXIM	获取价格	Low-Power, Low-Offset, Dual Mode, Class H DirectDrive Headphone Amplifier
MAX97200AEWC+	MAXIM	获取价格	Low-Power, Low-Offset, Dual Mode, Class H DirectDrive Headphone Amplifier
MAX97200BEWC	MAXIM	获取价格	Low-Power, Low-Offset, Dual Mode, Class H DirectDrive Headphone Amplifier
MAX97200BEWC+	MAXIM	获取价格	Low-Power, Low-Offset, Dual Mode, Class H DirectDrive Headphone Amplifier
MAX97200BEWC+T	MAXIM	获取价格	暂无描述
MAX9720AEBE+T	MAXIM	获取价格	Audio Amplifier, 0.05W, 2 Channel(s), 1 Func, BICMOS, PBGA16, 2 X 2 MM, 0.6 MM HEIGHT, UCS

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