Datasheet > MAX9895AEWX+

MAX9895AEWX+

更新时间： 2024-11-26 02:52:55

品牌	Logo	应用领域
美信 - MAXIM		/
页数	文件大小	规格书
22页	1209K
描述
Active Noise-Cancelling Solution for Stereo Headsets

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MAX9895AEWX+ 数据手册

19-4478; Rev 0; 10/09

Active Noise-Cancelling Solution

for Stereo Headsets

MX895A

General Description

Features

o 2.7V to 4.5V Operation

o Low Headphone Amplifier Noise

The MAX9895A is a complete audio subsystem for

active noise-cancelling (ANC) stereo headsets. The

device features three stages for each right and left

channel. A microphone preamplifier, an analog sound

processing block, and a headphone amplifier combine

to create a simple and very flexible active noise-cancel-

ing system.

o Low-Noise Microphone Preamplifiers with 2.2V

Bias

o Stereo 33mW into 16Ω Capacitorless Headphone

Amplifiers

o Microphone Output Path Available for Speech

The MAX9895A features a feed-forward architecture,

where outside microphones sense the ambient noise

and on-board analog sound processing generates the

compensation signal needed for noise reduction. This

further supports the mechanical isolation of the headset

by attenuating sound that leaks through the mechanics

of the headphone.

Transmission

o Adjustable Microphone Gain by I²C Interface or

External Resistors

o Low External Component Count

Ordering Information

The microphone preamplifiers feature programmable

gain, allowing alignment of the microphone and driver

tolerances and left-right channel matching. The head-

phone amplifiers are output capacitorless and can

deliver 33mW into a 16Ω transducer.

The MAX9895A has three modes of operation: ANC on,

PTL, and ANC off. The ANC-on mode demonstrates the

noise-canceling performance of the device. PTL (push-

to-listen) mode sends the microphone signals directly

to the headphones to temporarily listen to the surround-

ings. ANC off disables noise-canceling, but allows use

of the headphone amplifiers during music playback.

PIN-

GAIN

(V/V)

PART

TEMP RANGE

PACKAGE

MAX9895AEWX+ -40°C to +85°C

MAX9895AETL+ -40°C to +85°C

36 WLP

40 TQFN-EP*

+Denotes a lead(Pb)-free/RoHS-compliant package.

*EP = Exposed pad.

Simplified Block Diagram

The MAX9895A is available in a space-saving WLP or

TQFN package and is specified over the -40°C to

+85°C extended temperature range.

MAX9895A

HEADPHONE

LEFT

ANALOG

SIGNAL PROCESSING

Applications

Noise-Cancelling Headphones/Headsets

Headsets for Mobile Communication

Mobile Phones

MICROPHONE

INPUT LEFT

MIC

PREAMP

HEADPHONE

AMP

LINE

IN LEFT

HEADPHONE

RIGHT

Portable Gaming Devices

ANALOG

SIGNAL PROCESSING

E-Books

MICROPHONE

INPUT RIGHT

MIC

PREAMP

HEADPHONE

AMP

LINE

IN RIGHT

Pin Configurations appear at end of data sheet.

________________________________________________________________ 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.

12 3 4 5 6 7...22

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