MAX9725AETC+T Maxim Integrated Products, MAX9725AETC+T Datasheet

MAX9725AETC+T

Manufacturer Part Number

MAX9725AETC+T

Description

IC AMP AUDIO .025W STER 12TQFN

Manufacturer

Maxim Integrated Products

Series

DirectDrive™r

Type

Class ABr

Datasheet

1.MAX9725CETCT.pdf (17 pages)

Specifications of MAX9725AETC+T

Output Type

Headphones, 2-Channel (Stereo)

Max Output Power X Channels @ Load

25mW x 2 @ 16 Ohm

Voltage - Supply

900 mV ~ 1.8 V

Features

Depop, Short-Circuit Protection, Shutdown

Mounting Type

Surface Mount

Package / Case

12-TQFN Exposed Pad

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

Current page: 1 of 17
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The MAX9725A–MAX9725D fixed-gain, stereo head-

phone amplifiers are ideal for portable equipment where

board space is at a premium. The MAX9725E offers the

flexibility to adjust the gain with external input and feed-

back resistors. The MAX9725A–MAX9725E use a unique

DirectDrive architecture to produce a ground-referenced

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 adjustable gain of the MAX9725E DirectDrive head-

phone amplifier allows for any gain down to -1V/V using

external resistors.

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 4; 3/09

Ordering Information continued at end of data sheet.

Note: All devices are specified over the -40°C to +85°C operating

temperature range.

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

T = Tape and reel.

* EP = Exposed pad.

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.

MAX9725AEBC +TG45

M AX9725AE TC+

MAX9725BEBC +TG45

MP3 Players

Cellular Phones

PDAs

1V, Low-Power, DirectDrive, Stereo Headphone

PA RT

________________________________________________________________ Maxim Integrated Products

PIN- PA CK A G E

12 U C S P

12 TQFN- EP*

12 U C S P

Ordering Information

General Description

Smart Phones

Portable Audio Equipment

Applications

+ AAE W

M A RK

+ ACK

+ ACL

T O P

G A IN

( V/V)

- 1.5

- 2

Amplifier with Shutdown

♦ Low Quiescent Current

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

♦ Fixed Gain Eliminates External Feedback Network

♦ Adjustable Gain with External Input and Feedback

♦ 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.

Block Diagrams continued at end of data sheet.

Resistors

to Output Capacitors

MAX9725A: -2V/V

MAX9725B: -1.5V/V

MAX9725C: -1V/V

MAX9725D: -4V/V

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

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

MAX9725E: Minimum Stable Gain of -1V/V

2.1mA (MAX9725A–MAX9725D)

2.3mA (MAX9725E)

C1N

C1P

INR

INL

MAX9725A–MAX9725D

SGND

CHARGE PUMP

INVERTING

PGND

Block Diagrams

OUTL

OUTR

ELIMINATE DC-BLOCKING

DirectDrive OUTPUTS

CAPACITORS.

Features

SINGLE

1.5V CELL

AA OR AAA

BATTERY

Related parts for MAX9725AETC+T

MAX9725AETC+T Summary of contents

Page 1

... Denotes a lead(Pb)-free/RoHS-compliant package Tape and reel Exposed pad. UCSP is a trademark of Maxim Integrated Products, Inc. ________________________________________________________________ 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. Amplifier with Shutdown ♦ ...

Page 2

Low-Power, DirectDrive, Stereo Headphone Amplifier with Shutdown ABSOLUTE MAXIMUM RATINGS SGND to PGND .....................................................-0.3V to +0. SGND or PGND ............................................-0. ...........................................................-0.3V to +0. C1P to PGND..............................................-0. C1N ...

Page 3

Low-Power, DirectDrive, Stereo Headphone ELECTRICAL CHARACTERISTICS (MAX9725A–MAX9725D) (continued 1.5V 0V, V SHDN DD PGND SGND wise noted. Typical values are +25°C.) (See the Functional Diagrams. ) (Note 1) A PARAMETER ...

Page 4

Low-Power, DirectDrive, Stereo Headphone Amplifier with Shutdown ELECTRICAL CHARACTERISTICS (MAX9725E) (continued 1.5V 0V, V SHDN DD PGND SGND unless otherwise noted. Typical values are at T MIN MAX, PARAMETER SYMBOL ...

Page 5

Low-Power, DirectDrive, Stereo Headphone (V = 1.5V 0V, V SHDN DD PGND SGND to 22kHz +25°C, unless otherwise noted.) (See the Functional Diagrams TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY 1 ...

Page 6

Low-Power, DirectDrive, Stereo Headphone Amplifier with Shutdown (V = 1.5V 0V, V SHDN DD PGND SGND to 22kHz +25°C, unless otherwise noted.) (See the Functional Diagrams OUTPUT POWER vs. SUPPLY VOLTAGE ...

Page 7

Low-Power, DirectDrive, Stereo Headphone (V = 1.5V 0V, V SHDN DD PGND SGND to 22kHz +25°C, unless otherwise noted.) (See the Functional Diagrams SHUTDOWN CURRENT vs. SUPPLY VOLTAGE 0.7 0.6 0.5 ...

Page 8

Low-Power, DirectDrive, Stereo Headphone Amplifier with Shutdown Detailed Description The MAX9725 stereo headphone driver features Maxim’s DirectDrive architecture, eliminating the large output-cou- pling capacitors required by conventional single-supply headphone drivers. The MAX9725 consists of two 20mW class AB headphone ...

Page 9

Low-Power, DirectDrive, Stereo Headphone LF ROLLOFF (16Ω LOAD 330μF -5 220μF -10 -3dB CORNER FOR 100μF 100μF IS 100Hz -15 33μF -20 -25 -30 -35 10 100 FREQUENCY (Hz) Figure 2. Low-Frequency Attenuation for Common DC-Blocking Capacitor ...

Page 10

Low-Power, DirectDrive, Stereo Headphone Amplifier with Shutdown OUTPUT POWER vs. SUPPLY VOLTAGE WITH INPUTS IN- AND OUT-OF-PHASE 1kHz 16Ω L THD INPUTS 180 ° OUT-OF-PHASE ...

Page 11

Low-Power, DirectDrive, Stereo Headphone Component Selection The AC-coupling capacitor (C ) and an internal gain- IN setting resistor form a highpass filter that removes any DC bias from an input signal (see the Functional Diagrams ). C allows the ...

Page 12

Low-Power, DirectDrive, Stereo Headphone Amplifier with Shutdown MP3 STEREO DECODER DAC 1μF R 1μ ______________________________________________________________________________________ 0.9V TO 1.8V 1μF V SHDN 1μF DD INR INL 1μF MAX9725A– MAX9725D C1P 1μF OUTR C1N V SS OUTL PV SS ...

Page 13

Low-Power, DirectDrive, Stereo Headphone 0.9V TO 1.8V C3 1μF 9 (C2 (C1) C1P CHARGE C1 PUMP 1μF 1 (A1) C1N (A2) C2 1μF *MAX9725A = 50kΩ. MAX9725B = 37.5kΩ. MAX9725C = 25kΩ. MAX9725D ...

Page 14

Low-Power, DirectDrive, Stereo Headphone Amplifier with Shutdown 0.9V TO 1.8V C3 1μF 9 (C2 (C1) C1P CHARGE C1 PUMP 1μF 1 (A1) C1N (A2) (B4) C2 1μ DENOTE BUMPS ...

Page 15

Low-Power, DirectDrive, Stereo Headphone MAX9725 TOP VIEW (BUMP-SIDE DOWN C1N PGND SHDN C C1P V DD UCSP Block Diagrams (continued MAX9725E INL OUTL C1P PV SS INVERTING CHARGE ...

Page 16

Low-Power, DirectDrive, Stereo Headphone Amplifier with Shutdown Chip Information PROCESS: BiCMOS 16 ______________________________________________________________________________________ Package Information For the latest package outline information and land patterns www.maxim-ic.com/packages. Note that a “+”, “#”, or “-” in the package code indicates ...

Page 17

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 17 © 2009 Maxim Integrated Products ...

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