max9721aetct Maxim Integrated Products, Inc., max9721aetct Datasheet

max9721aetct

Manufacturer Part Number

max9721aetct

Description

Max9721 1v, Fixed-gain, Directdrive, Stereo Headphone Amplifier With Shutdown

Manufacturer

Maxim Integrated Products, Inc.

Datasheet

1.MAX9721AETCT.pdf (14 pages)

Current page: 1 of 14
Download datasheet (560Kb)

The MAX9721 fixed-gain, stereo headphone amplifier

is ideal for portable equipment where board space is at a

premium. The MAX9721 uses a unique, patented

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 (MAX9721A),

-1.5V/V (MAX9721B), and -1V/V (MAX9721C) further

reduce external component count.

The MAX9721 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

MAX9721 to operate from noisy digital supplies without

an additional linear regulator. The MAX9721 includes

±8kV ESD protection 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

1.0µA (typ).

The MAX9721 operates from a single 0.9V to 1.8V sup-

ply allowing the device to be powered directly from a

single AA or AAA battery. The MAX9721 consumes only

2.2mA of supply current, provides short-circuit protection,

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

perature range. The MAX9721 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).

19-3167; Rev 0; 1/04

*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.

MAX9721AEBC -T* - 40 C to + 85 C 12 U C S P- 12

M AX9721AE TC

MAX9721BEBC -T* - 40 C to + 85 C 12 U C S P- 12

M AX9721BE TC

MAX9721CEBC-T* - 40 C to + 85 C 12 U C S P- 12

M AX9721C E TC

MP3 Players

Cellular Phones

PDAs

1V, Fixed-Gain, DirectDrive, Stereo Headphone

PA RT

T EM P R AN G E

- 40 C to + 85 C 12 TQFN- EP** AADZ

- 40 C to + 85 C 12 TQFN- EP** AAEA

- 40 C to + 85 C 12 TQFN- EP** AAEB

________________________________________________________________ Maxim Integrated Products

Ordering Information

General Description

Smart Phones

Portable Audio Equipment

PIN-

PA CK A G E

Applications

M A RK

T O P

ABQ

ABP

ABR

G A IN

( V/V)

- 1.5

- 2

- 1

Amplifier with Shutdown

Pin Configurations appear at end of data sheet.

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

to Output Capacitors

20mW per Channel into 32Ω

Low 0.006% THD+N

High PSRR (80dB at 1kHz)

Integrated Click-and-Pop Suppression

Low Quiescent Current (2.2mA)

Low-Power Shutdown Control

Short-Circuit Protection

±8kV ESD-Protected Amplifier Outputs

Available in Space-Saving Packages

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

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

MAX9721A: -2V/V

MAX9721B: -1.5V/V

MAX9721C: -1V/V

C1N

C1P

INR

INL

MAX9721

SGND

CHARGE PUMP

INVERTING

PGND

OUTL

OUTR

Block Diagram

SINGLE

1.5V CELL

AA OR AAA

BATTERY

ELIMINATE DC-BLOCKING

DirectDrive OUTPUTS

CAPACITORS.

Features

Related parts for max9721aetct

max9721aetct Summary of contents

Page 1

... TQFN- EP** AAEB *Future product—contact factory for availability. **EP = Exposed paddle. UCSP is a trademark of Maxim Integrated Products, Inc. ________________________________________________________________ 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. ...

Page 2

Fixed-Gain, 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

Fixed-Gain, DirectDrive, Stereo Headphone ELECTRICAL CHARACTERISTICS (continued 1.5V, PGND = SGND = 0V, V SHDN DD noted. Typical values are +25°C.) (See the Functional Diagram.) A PARAMETER SYMBOL Signal-to-Noise Ratio SNR Slew Rate SR ...

Page 4

Fixed-Gain, 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 Diagram.) A TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT POWER ...

Page 5

Fixed-Gain, DirectDrive, Stereo Headphone (V = 1.5V, PGND = SGND = 0V, V SHDN DD to 22kHz +25°C, unless otherwise noted.) (See the Functional Diagram.) A POWER DISSIPATION vs. OUTPUT POWER 16Ω ...

Page 6

Fixed-Gain, DirectDrive, Stereo Headphone Amplifier with Shutdown PIN BUMP NAME THIN UCSP QFN 1 A1 C1N Flying Capacitor Negative Terminal. Connect a 1µF capacitor from C1P to C1N Inverting Charge-Pump Output. Bypass with 1µF from PV ...

Page 7

Fixed-Gain, DirectDrive, Stereo Headphone V OUT CONVENTIONAL DRIVER-BIASING SCHEME V OUT DirectDrive BIASING SCHEME Figure 1. Traditional Driver Output Waveform vs. MAX9721 Output Waveform (Ideal Case) Pump Capacitance and Load Resistance graph in the Typical Operating Characteristics for details ...

Page 8

Fixed-Gain, DirectDrive, Stereo Headphone Amplifier with Shutdown 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 ...

Page 9

Fixed-Gain, DirectDrive, Stereo Headphone OUTPUT POWER vs. SUPPLY VOLTAGE WITH INPUTS IN- AND OUT-OF-PHASE 1kHz 16Ω L THD INPUTS 180 ° OUT-OF-PHASE INPUTS ...

Page 10

Fixed-Gain, DirectDrive, Stereo Headphone Amplifier with Shutdown Table 1. Suggested Capacitor Manufacturers SUPPLIER Taiyo Yuden TDK Power-Supply Bypass Capacitor (C3) The power-supply bypass capacitor (C3) lowers the output impedance of the power supply and reduces the impact of the ...

Page 11

Fixed-Gain, DirectDrive, Stereo Headphone MP3 DECODER MAX9721 TOP VIEW (BUMPS SIDE 1 2 DOWN) A C1N PGND SHDN C C1P V DD UCSP ______________________________________________________________________________________ Amplifier with Shutdown 0.9V TO 1.8V 0.47µF V RIGHT DAC SHDN DD ...

Page 12

Fixed-Gain, 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) C2 1µF *MAX9721A = 50kΩ. MAX9721B = 37.5kΩ. MAX9721C ...

Page 13

Fixed-Gain, 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 PACKAGE OUTLINE, 4x3 UCSP 1 21-0104 ...

Page 14

Fixed-Gain, 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 Maxim cannot assume responsibility for use of any circuitry ...

Related keywords

max9721aetct datasheet
max9721aetct data sheet
max9721aetct pdf datasheet
max9721aetct component
max9721aetct part
max9721aetct distributor
max9721aetct RoHS
max9721aetct datasheet download