Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsLinear ICsLinear IC - Audio amplifier Headphones (2-channel, stereo) Class AB TQFN 20 (4x4)

General Description

The MAX4411 fixed-gain, stereo headphone amplifier is

designed for portable equipment where board space is

at a premium. The MAX4411 uses 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. Additionally, the gain of the

amplifier is set internally (-1.5V/V, MAX4411 and

-2V/V, MAX4411B), further reducing component count.

The MAX4411 delivers up to 80mW per channel into a

16Ω load and has low 0.003% THD+N. An 86dB at

217Hz power-supply rejection ratio (PSRR) allows this

device to operate from noisy digital supplies without an

additional linear regulator. The MAX4411 includes ±8kV

ESD protection on the headphone outputs. Com-

prehensive click-and-pop circuitry suppresses audible

clicks and pops on startup and shutdown. Independent

left/right, low-power shutdown controls make it possible

to optimize power savings in mixed-mode, mono/stereo

applications.

The MAX4411 operates from a single 1.8V to 3.6V supply,

consumes only 5mA of supply current, has short-circuit

and thermal-overload protection, and is specified over the

extended -40°C to +85°C temperature range. The

MAX4411 is available in a tiny (2mm

✕ 2mm ✕ 0.6mm),

16-bump chip-scale package (UCSP™) and a 20-pin thin

QFN package (4mm ✕ 4mm ✕ 0.8mm).

Applications

Features

♦ No Bulky DC-Blocking Capacitors Required

♦ Fixed -1.5V/V Gain Eliminates External Feedback

Network

MAX4411: -1.5V/V

MAX4411B: -2V/V

♦ Ground-Referenced Outputs Eliminate DC-Bias

Voltages on Headphone Ground Pin

♦ No Degradation of Low-Frequency Response Due

to Output Capacitors

♦ 80mW per Channel into 16Ω

♦ Low 0.003% THD+N

♦ High PSRR (86dB at 217Hz)

♦ Integrated Click-and-Pop Suppression

♦ 1.8V to 3.6V Single-Supply Operation

♦ Low Quiescent Current (5mA)

♦ Independent Left/Right, Low-Power

Shutdown Controls

♦ Short-Circuit and Thermal-Overload Protection

♦ ±8kV ESD-Protected Amplifier Outputs

♦ Available in Space-Saving Packages

16-Bump UCSP (2mm

✕ 2mm ✕ 0.6mm)

20-Pin Thin QFN (4mm

✕ 4mm ✕ 0.8mm)

MAX4411

80mW, Fixed-Gain, DirectDrive, Stereo

Headphone Amplifier with Shutdown

________________________________________________________________ Maxim Integrated Products 1

LEFT

AUDIO

INPUT

DirectDrive OUTPUTS

ELIMINATE DC-BLOCKING

CAPACITORS

FIXED GAIN ELIMINATES

EXTERNAL RESISTOR

NETWORK

RIGHT

AUDIO

INPUT

SHDNL

SHDNR

MAX4411

Functional Diagram

Ordering Information

19-2618; Rev 2; 9/06

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.

EVALUATION KIT

AVAILABLE

PART

TEMP RANGE

PIN/BUMP-

PACKAGE

GAIN

(V/V)

MAX4411EBE-T

-40°C to +85°C 16 UCSP-16

-1.5

MAX4411EBE+T

-40°C to +85°C 16 UCSP-16

-1.5

MAX4411ETP

-40°C to +85°C 20 Thin QFN

-1.5

Notebook PCs

Cellular Phones

PDAs

MP3 Players

Smart Phones

Portable Audio Equipment

UCSP is a trademark of Maxim Integrated Products, Inc.

Pin Configurations and Typical Application Circuit appear at end of data sheet.

Ordering Information continued at end of data sheet.

+Denotes lead-free package.

Summary of content (18 pages)

PAGE 1
9-2618; Rev 2; 9/06 KIT ATION EVALU E L B A AVAIL 80mW, Fixed-Gain, DirectDrive, Stereo Headphone Amplifier with Shutdown Features The MAX4411 fixed-gain, stereo headphone amplifier is designed for portable equipment where board space is at a premium. The MAX4411 uses a unique DirectDrive architecture to produce a ground-referenced output from a single supply, eliminating the need for large DCblocking capacitors, saving cost, board space, and component height.
PAGE 2
MAX4411 80mW, Fixed-Gain, DirectDrive, Stereo Headphone Amplifier with Shutdown ABSOLUTE MAXIMUM RATINGS PGND to SGND .....................................................-0.3V to +0.3V PVDD to SVDD .................................................................-0.3V to +0.3V PVSS to SVSS .........................................................-0.3V to +0.3V PVDD and SVDD to PGND or SGND .........................-0.3V to +4V PVSS and SVSS to PGND or SGND ..........................-4V to +0.
PAGE 3
80mW, Fixed-Gain, DirectDrive, Stereo Headphone Amplifier with Shutdown (PVDD = SVDD = 3V, PGND = SGND = 0V, SHDNL = SHDNR = SVDD, C1 = C2 = 2.2µF, CIN = 1µF, RL = ∞, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1) PARAMETER SYMBOL CONDITIONS 1.8V ≤ VDD ≤ 3.6V, MAX4411B Power-Supply Rejection Ratio PSRR Output Power DC (Note 2) VDD = 3.
PAGE 4
Typical Operating Characteristics (continued) (C1 = C2 = 2.2µF, THD+N measurement bandwidth = 22Hz to 22kHz, TA = +25°C, unless otherwise noted.) 10 THD+N (%) THD+N (%) 0.1 POUT = 5mW POUT = 10mW 0.01 OUTPUTS IN PHASE VDD = 3V RL = 16Ω fIN = 20Hz OUTPUTS 180° OUT OF PHASE 1 0.1 0.01 10 100 1k 10k ONE CHANNEL DRIVEN 50 100 200 150 0 50 100 200 150 OUTPUT POWER (mW) OUTPUT POWER (mW) TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT POWER TOTAL HARMONIC DISTORTION PLUS NOISE vs.
PAGE 5
80mW, Fixed-Gain, DirectDrive, Stereo Headphone Amplifier with Shutdown (C1 = C2 = 2.2µF, THD+N measurement bandwidth = 22Hz to 22kHz, TA = +25°C, unless otherwise noted.) OUTPUTS 180° OUT OF PHASE 0.1 VDD = 1.8V RL = 32Ω fIN = 20Hz 10 OUTPUTS IN PHASE 1 100 0.1 VDD = 1.8V RL = 32Ω fIN = 1kHz 10 THD+N (%) 1 OUTPUTS IN PHASE THD+N (%) THD+N (%) 10 100 MAX4411 toc14 VDD = 1.8V RL = 16Ω fIN = 10kHz MAX4411 toc13 100 TOTAL HARMONIC DISTORTION PLUS NOISE vs.
PAGE 6
Typical Operating Characteristics (continued) (C1 = C2 = 2.2µF, THD+N measurement bandwidth = 22Hz to 22kHz, TA = +25°C, unless otherwise noted.) OUTPUT POWER vs. SUPPLY VOLTAGE 100 80 60 INPUTS IN PHASE 40 INPUTS 180° OUT OF PHASE 200 150 100 INPUTS IN PHASE 50 0 2.4 2.7 3.0 3.3 2.1 2.4 INPUTS 180° OUT OF PHASE 120 100 80 INPUTS IN PHASE 60 3.0 3.3 120 INPUTS 180° OUT OF PHASE 60 0 0 2.4 2.7 3.0 2.4 3.3 3.0 3.
PAGE 7
80mW, Fixed-Gain, DirectDrive, Stereo Headphone Amplifier with Shutdown INPUTS 180° OUT OF PHASE 120 100 80 fIN = 1kHz RL = 32Ω VDD = 3V POUT = POUTL + POUTR 40 20 80 120 160 200 30 20 fIN = 1kHz RL = 32Ω VDD = 1.8V POUT = POUTL + POUTR 10 0 10 0 20 30 40 50 60 0 10 20 30 40 50 GAIN FLATNESS vs. FREQUENCY CHARGE-PUMP OUTPUT RESISTANCE vs. SUPPLY VOLTAGE OUTPUT POWER vs. CHARGE-PUMP CAPACITANCE AND LOAD RESISTANCE -10 -15 -20 C1 = C2 = 2.
PAGE 8
MAX4411 80mW, Fixed-Gain, DirectDrive, Stereo Headphone Amplifier with Shutdown Typical Operating Characteristics (continued) (C1 = C2 = 2.2µF, THD+N measurement bandwidth = 22Hz to 22kHz, TA = +25°C, unless otherwise noted.
PAGE 9
80mW, Fixed-Gain, DirectDrive, Stereo Headphone Amplifier with Shutdown The MAX4411 fixed-gain, stereo headphone driver features Maxim’s DirectDrive architecture, eliminating the large output-coupling capacitors required by conventional single-supply headphone drivers. The device consists of two 80mW Class AB headphone drivers, internal feedback network, undervoltage lockout (UVLO)/shutdown control, charge pump, and comprehensive clickand-pop suppression circuitry (see Typical Application Circuit).
PAGE 10
MAX4411 80mW, Fixed-Gain, DirectDrive, Stereo Headphone Amplifier with Shutdown MICROPHONE BIAS LOW-FREQUENCY ROLLOFF (RL = 16Ω) MICROPHONE AMPLIFIER MICROPHONE AMPLIFIER OUTPUT 0 -3 DirectDrive ATTENUATION (dB) -6 AUDIO INPUT -9 330μF -12 220μF -15 100μF -18 33μF -21 -24 AUDIO INPUT MAX4411 -27 -30 10 100 1k 10k 100k FREQUENCY (Hz) HEADPHONE DRIVER Figure 2.
PAGE 11
80mW, Fixed-Gain, DirectDrive, Stereo Headphone Amplifier with Shutdown MAX4411 fig04 10 THD+N (%) 1 0.1 TANTALUM 0.01 0.001 ALUM/ELEC 0.0001 10 100 1k 10k 100k FREQUENCY (Hz) Figure 4. Distortion Contributed by DC-Blocking Capacitors duced by two different capacitor dielectric types. Note that below 100Hz, THD+N increases rapidly.
PAGE 12
MAX4411 80mW, Fixed-Gain, DirectDrive, Stereo Headphone Amplifier with Shutdown fIN = 1kHz RL = 16Ω THD+N = 10% OUTPUT POWER (mW) 250 INPUTS 180° OUT OF PHASE MAX4411 fig05 OUTPUT POWER vs. SUPPLY VOLTAGE 300 200 Component Selection 150 100 INPUTS IN PHASE 50 0 1.8 2.1 2.4 2.7 3.0 3.3 3.6 SUPPLY VOLTAGE (V) Figure 5. Output Power vs. Supply Voltage with Inputs In/Out of Phase output, supply, and ground traces improve the maximum power dissipation in the package.
PAGE 13
80mW, Fixed-Gain, DirectDrive, Stereo Headphone Amplifier with Shutdown PHONE FAX Taiyo Yuden SUPPLIER 800-348-2496 847-925-0899 www.t-yuden.com WEBSITE TDK 847-803-6100 847-390-4405 www.component.tdk.com Note: Please indicate you are using the MAX4411 when contacting these component suppliers. output ripple. Likewise, decreasing the ESR of C2 reduces both ripple and output resistance. Lower capacitance values can be used in systems with low maximum output power levels. See the Output Power vs.
PAGE 14
80mW, Fixed-Gain, DirectDrive, Stereo Headphone Amplifier with Shutdown MAX4411 System Diagram VDD 0.1μF 15kΩ 0.1μF 15kΩ INR VDD PVDD 0.1μF 1μF OUTR- MAX9710 BIAS AUX_IN OUTR+ 1μF SHDN OUT OUTL- 0.1μF 15kΩ MAX4060 BIAS OUTL+ INL VCC 15kΩ CODEC VCC 2.2kΩ 10kΩ 0.1μF IN- IN+ VCC 10kΩ Q IN0.1μF MAX961 Q 100kΩ 100kΩ IN+ 0.
PAGE 15
80mW, Fixed-Gain, DirectDrive, Stereo Headphone Amplifier with Shutdown 1.8V TO 3.
PAGE 16
80mW, Fixed-Gain, DirectDrive, Stereo Headphone Amplifier with Shutdown INL N.C. OUTR 15 14 13 12 11 TOP VIEW 1 2 3 4 INR SGND PVDD C1P A B PGND 10 SVDD SGND 17 9 OUTL 8 N.C. PVDD 19 7 SVSS N.C. 20 6 N.C. SHDNL 18 SVDD OUTL C1N SVSS PVSS UCSP (B16-2) 1 2 3 4 5 PVSS OUTR PGND D INL MAX4411 C1P C N.C. SHDNL N.C.
PAGE 17
80mW, Fixed-Gain, DirectDrive, Stereo Headphone Amplifier with Shutdown 16L,UCSP.EPS PACKAGE OUTLINE, 4x4 UCSP 21-0101 H 1 1 ______________________________________________________________________________________ 17 MAX4411 Package Information (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages.
PAGE 18
Package Information (continued) (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages.) 24L QFN THIN.EPS MAX4411 80mW, Fixed-Gain, DirectDrive, Stereo Headphone Amplifier with Shutdown Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied.