MAX9725 Maxim Integrated Products, MAX9725 Datasheet

MAX9725

Manufacturer Part Number

MAX9725

Description

Stereo Headphone Amplifier

Manufacturer

Maxim Integrated Products

Datasheet

1.MAX9725.pdf (14 pages)

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Company:

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Part Number:

MAX9725CETC+T

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Company:

Meier Automation Equipment Co., Limited

Part Number:

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The MAX9725 fixed-gain, stereo headphone amplifier

is ideal for portable equipment where board space is at a

premium. The MAX9725 uses a unique, patented

DirectDrive

output from a single supply, eliminating the need for large

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

component height. Fixed gains of -2V/V (MAX9725A),

1.5V/V (MAX9725B), -1V/V (MAX9725C), and -4V/V

(MAX9725D) further reduce external component count.

The MAX9725 delivers up to 20mW per channel into a

32Ω load and achieves 0.006% THD+N. An 80dB at 1kHz

power-supply rejection ratio (PSRR) allows the MAX9725

to operate from noisy digital supplies without an additional

linear regulator. The MAX9725 includes ±8kV ESD protec-

tion on the headphone output. Comprehensive click-and-

pop circuitry suppresses audible clicks and pops at

startup and shutdown. A low-power shutdown mode

reduces supply current to 0.6µA (typ).

The MAX9725 operates from a single 0.9V to 1.8V supply,

allowing the device to be powered directly from a single

AA or AAA battery. The MAX9725 consumes only

2.1mA of supply current, provides short-circuit protection,

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

perature range. The MAX9725 is available in a tiny

(1.54mm x 2.02mm x 0.6mm) 12-bump chip-scale

package (UCSP™) and a 12-pin thin QFN package

(4mm x 4mm x 0.8mm).

19-3465; Rev 0; 11/04

*Future product—contact factory for availability.

**EP = Exposed paddle.

UCSP is a trademark of Maxim Integrated Products, Inc.

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.

MAX9725AEBC -T*

M AX9725AE TC

MAX9725BEBC -T*

M AX9725BE TC

MAX9725CEBC-T*

M AX9725C E TC

MAX9725D EBC -T* - 40°C to + 85°C 12 U C S P- 12

M AX9725D E TC

MP3 Players

Cellular Phones

PDAs

1V, Low-Power, DirectDrive, Stereo Headphone

PA RT

architecture to produce a ground-referenced

T EM P R AN G E

- 40°C to + 85°C 12 U C S P- 12

- 40°C to + 85°C 12 TQFN- EP** AAEW

- 40°C to + 85°C 12 U C S P- 12

- 40°C to + 85°C 12 TQFN- EP**

- 40°C to + 85°C 12 U C S P- 12

- 40°C to + 85°C 12 TQFN- EP**

________________________________________________________________ Maxim Integrated Products

Ordering Information

General Description

Smart Phones

Portable Audio Equipment

PIN-

PA CK A G E

Applications

M A RK

AAEX

AAEY

AAEZ

AC M

T O P

AC N

AC K

AC L

G A IN

( V/V)

- 1.5

- 2

- 1

- 4

Amplifier with Shutdown

♦ Low Quiescent Current (2.1mA)

♦ Single-Cell, 0.9V to 1.8V Single-Supply Operation

♦ Fixed Gain Eliminates External Feedback Network

♦ Ground-Referenced Outputs Eliminate DC Bias

♦ No Degradation of Low-Frequency Response Due

♦ 20mW per Channel into 32Ω

♦ Low 0.006% THD+N

♦ High PSRR (80dB at 1kHz)

♦ Integrated Click-and-Pop Suppression

♦ Low-Power Shutdown Control

♦ Short-Circuit Protection

♦ ±8kV ESD-Protected Amplifier Outputs

♦ Available in Space-Saving Packages

Pin Configurations appear at end of data sheet.

to Output Capacitors

12-Bump UCSP (1.54mm x 2.02mm x 0.6mm)

12-Pin Thin QFN (4mm x 4mm x 0.8mm)

MAX9725A: -2V/V

MAX9725B: -1.5V/V

MAX9725C: -1V/V

MAX9725D: -4V/V

C1N

C1P

INL

INR

MAX9725

SGND

CHARGE PUMP

INVERTING

PGND

Block Diagram

OUTL

OUTR

SINGLE

1.5V CELL

AA OR AAA

BATTERY

ELIMINATE DC-BLOCKING

DirectDrive OUTPUTS

CAPACITORS.

Features

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