max9725betct Maxim Integrated Products, Inc., max9725betct Datasheet

max9725betct

Manufacturer Part Number

max9725betct

Description

Max9725 1v, Low-power, Directdrive, Stereo Headphone Amplifier With Shutdown

Manufacturer

Maxim Integrated Products, Inc.

Datasheet

1.MAX9725BETCT.pdf (19 pages)

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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,

patented DirectDrive

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 headphone 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 2; 11/07

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-free 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 +T

M AX9725AE TC+

MAX9725BEBC +T

MP3 Players

Cellular Phones

PDAs

1V, Low-Power, DirectDrive, Stereo Headphone

PA RT

PIN-

PA CK A G E

12 U C S P- 12

12 TQFN- EP*

12 U C S P- 12

________________________________________________________________ Maxim Integrated Products

Ordering Information

architecture to produce a ground-

General Description

Smart Phones

Portable Audio Equipment

T1244- 4

C O DE

B12- 1

PK G

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

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

MAX9725E: Minimum Stable Gain of -1V/V

2.1mA (MAX9725A–MAX9725D)

2.3mA (MAX9725E)

C1P

C1N

INL

INR

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 max9725betct

max9725betct Summary of contents

Page 1

... Note: All devices are specified over the -40°C to +85°C operating temperature range. +Denotes a lead-free package Tape and reel. *EP = 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. ...

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, PGND = SGND = 0V, V SHDN DD noted. Typical values are +25°C.) (See the Functional Diagrams.) (Note 1) A PARAMETER SYMBOL Total Harmonic Distortion ...

Page 4

Low-Power, DirectDrive, Stereo Headphone Amplifier with Shutdown ELECTRICAL CHARACTERISTICS (MAX9725E) (continued 1.5V, PGND = SGND = 0V, V SHDN unless otherwise noted. Typical values are at T MAX, PARAMETER SYMBOL Output Power (Note 3) ...

Page 5

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

Page 6

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

Page 7

Low-Power, DirectDrive, Stereo Headphone (V = 1.5V, PGND = SGND = 0V, V SHDN DD to 22kHz +25°C, unless otherwise noted.) (See the Functional Diagrams.) A SHUTDOWN CURRENT vs. SUPPLY VOLTAGE 0.7 0.6 0.5 0.4 0.3 0.2 ...

Page 8

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

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 Diagram). C allows the MAX9725A–MAX9725D ...

Page 12

Low-Power, DirectDrive, Stereo Headphone Amplifier with Shutdown MP3 STEREO DECODER DAC 1μF 1μF 12 ______________________________________________________________________________________ 0.9V TO 1.8V 1μF V SHDN 1μF DD INR INL 1μF MAX9725A– MAX9725D C1P 1μF OUTR C1N V SS OUTL PV SS 1μF SGND ...

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 (B4) (A2) C2 1μF *MAX9725A = 50kΩ. MAX9725B = 37.5kΩ. MAX9725C ...

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 C1N (A1 (A2) C2 1μF *MAX9725A = 50kΩ. MAX9725B = 37.5kΩ. MAX9725C ...

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 (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information www.maxim-ic.com/packages.) 16 ______________________________________________________________________________________ Package Information PACKAGE OUTLINE, 4x3 UCSP 1 ...

Page 17

Low-Power, DirectDrive, Stereo Headphone (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information www.maxim-ic.com/packages.) ______________________________________________________________________________________ Amplifier with Shutdown Package Information (continued) 17 ...

Page 18

Low-Power, DirectDrive, Stereo Headphone Amplifier with Shutdown (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information www.maxim-ic.com/packages.) 18 ______________________________________________________________________________________ Package Information (continued) ...

Page 19

... 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 ____________________ 19 © 2007 Maxim Integrated Products Amplifier with Shutdown DESCRIPTION is a registered trademark of Maxim Integrated Products, Inc. Revision History PAGES CHANGED — ...

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