Datasheet

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Differential Input DirectDrive

Line Drivers/Headphone Amplifiers

MAX97220A–MAX97220E

EVALUATION KIT AVAILABLE

General Description

The MAX97220_ is a differential input DirectDrive

line

driver/headphone amplifier. This device is capable of

driving line level loads with 3V

RMS

into 1kI with a 5V

supply and 2V

RMS

into 600I loads from a 3.3V supply. A

headphone load is capable of being driven with 125mW

into 32I with a 5V supply. The IC is offered with an inter-

nally fixed 6dB gain or an externally set gain through

external resistors. The external gain setting nodes can

also be used to configure filters for set-top box applica-

tions. The IC has exceptional THD+N over the full audio

bandwidth.

Two versions of the IC are available with different turn-

on times (t

). The A, C, and E versions for headphone

applications feature a t

of 5.5ms while the B and D

versions, intended for set-top-box applications, feature a

130ms t

. An on-chip charge pump inverts the power-

supply input, creating a negative rail. The output stage of

the amplifier is powered between the positive input sup-

ply and the output of the charge pump. The bipolar sup-

plies bias the output about ground, eliminating the need

for large, distortion-introducing output coupling capaci-

tors. The IC powers on and off without clicks or pops.

The IC is available in a 3mm x 3mm x 0.8mm, 16-pin

TQFN and is specified over the extended -40NC to +85NC

temperature range.

Applications

Simple Multimedia Interfaces

Set-Top Boxes

Blu-rayK and DVD Players

LCD Televisions

Prosumer Audio Devices

Features

S Output Power 125mW into 32I with a 5V Supply

RMS

Output Drive into 1kI with a 5V Supply

RMS

Output Drive into 600I with a 3.3V Supply

Fully Differential Inputs

Fixed or Externally Adjustable Gain with No

Clicks or Pops

S Wide 2.5V to 5.5V Operating Range

DirectDrive Outputs Eliminate DC-Blocking

Capacitors

S Flat THD+N, Better Than 90dB in the Audio Band

18-Bit SNR Performance, 112dB

Footprint Compatible with the MAX9722

19-5611; Rev 2; 7/12

Note: All devices operate over the -40NC to +85NC temperature

range.

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

*EP = Exposed pad.

Ordering Information

DirectDrive is a registered trademark of Maxim Integrated

Products, Inc.

Blu-ray is a trademark of the Blu-ray Disc Association.

Simplified Block Diagrams

Functional Diagrams appear at end of data sheet.

LEFT

AUDIO

INPUT

RIGHT

AUDIO

INPUT

INL-

OUTL

OUTR

INL+

INR+

INR-

MAX97220A/B/E

LEFT

AUDIO

INPUT

RIGHT

AUDIO

INPUT

OUTL

SGND

OUTR

MAX97220C/D

INL-

INL+

INR+

INR-

PART

PIN-

PACKAGE

TOP

MARK

GAIN

SET

TURN-ON

TIME (ms)

MAX97220AETE+ 16 TQFN-EP* +AIF External 5.5

MAX97220BETE+ 16 TQFN-EP* +AIG External 130

MAX97220CETE+ 16 TQFN-EP* +AIH +6dB 5.5

MAX97220DETE+ 16 TQFN-EP* +AII +6dB 130

MAX97220EETE+ 16 TQFN-EP* +AII External 5.5

For pricing, delivery, and ordering information, please contact Maxim Direct

at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.

Summary of content (19 pages)

PAGE 1
EVALUATION KIT AVAILABLE MAX97220A–MAX97220E Differential Input DirectDrive Line Drivers/Headphone Amplifiers General Description DirectDrive® The MAX97220_ is a differential input line driver/headphone amplifier. This device is capable of driving line level loads with 3VRMS into 1kI with a 5V supply and 2VRMS into 600I loads from a 3.3V supply. A headphone load is capable of being driven with 125mW into 32I with a 5V supply.
PAGE 2
MAX97220A–MAX97220E Differential Input DirectDrive Line Drivers/Headphone Amplifiers ABSOLUTE MAXIMUM RATINGS (All voltages referenced to PGND.) SVDD, SVDD2, and PVDD.......................................-0.3V to +6V PVSS and BIAS........................................................-6V to +0.3V SGND....................................................................-0.3V to +0.3V INL-, INL+, INR-, and INR+ (A, B, and E)...-VSVDD/2 to +VSVDD/2 INL-, INL+, INR-, and INR+ (C and D)........ (-0.
PAGE 3
MAX97220A–MAX97220E Differential Input DirectDrive Line Drivers/Headphone Amplifiers ELECTRICAL CHARACTERISTICS (continued) (VPVDD = VSVDD = VSVDD2 = 5V, VPGND = VSGND = 0V, CBIAS = 0.1µF, C1 = C2 = 1µF, RIN = 20kω, RF = 20kω (MAX97220A/ MAX97220B/MAX97220E), typical values tested at TA = +25°C, unless otherwise noted.) (Notes 2 and 3) PARAMETER Power-Supply Rejection Ratio Common-Mode Rejection Ratio SYMBOL PSRR CMRR CONDITIONS VOUT TYP VPVDD = VSVDD_ = 2.5V to 5.
PAGE 4
MAX97220A–MAX97220E Differential Input DirectDrive Line Drivers/Headphone Amplifiers ELECTRICAL CHARACTERISTICS (continued) (VPVDD = VSVDD = VSVDD2 = 5V, VPGND = VSGND = 0V, CBIAS = 0.1µF, C1 = C2 = 1µF, RIN = 20kω, RF = 20kω (MAX97220A/ MAX97220B/MAX97220E), typical values tested at TA = +25°C, unless otherwise noted.
PAGE 5
MAX97220A–MAX97220E Differential Input DirectDrive Line Drivers/Headphone Amplifiers ELECTRICAL CHARACTERISTICS (continued) (VPVDD = VSVDD = VSVDD2 = 5V, VPGND = VSGND = 0V, CBIAS = 0.1µF, C1 = C2 = 1µF, RIN = 20kω, RF = 20kω (MAX97220A/ MAX97220B/MAX97220E), typical values tested at TA = +25°C, unless otherwise noted.
PAGE 6
MAX97220A–MAX97220E Differential Input DirectDrive Line Drivers/Headphone Amplifiers Typical Operating Characteristics (continued) (VPVDD = VSVDD = VSVDD2 = 5V, VPGND = VSGND = 0V, CBIAS = 0.1µF, C1 = C2 = 1µF, RIN = 10kω, RF = 10kω, unless otherwise noted.) 100 POUT = 20mW 1 0.1 THD+N (%) 0.1 POUT = 25mW 0.01 0.01 0.001 0.001 0.001 1 0.0001 10 100 0.0001 0.01 0.1 1 10 100 1.0 1.5 2.0 2.5 MAX97220 toc10 0.01 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.
PAGE 7
MAX97220A–MAX97220E Differential Input DirectDrive Line Drivers/Headphone Amplifiers Typical Operating Characteristics (continued) (VPVDD = VSVDD = VSVDD2 = 5V, VPGND = VSGND = 0V, CBIAS = 0.1µF, C1 = C2 = 1µF, RIN = 10kω, RF = 10kω, unless otherwise noted.) OUTPUT VOLTAGE vs. SUPPLY VOLTAGE 3.0 2.5 THD+N = 1% 2.0 1.5 3.5 3.0 2.5 THD+N = 1% 2.0 1.5 175 125 100 75 50 0.5 25 0 4.0 4.5 5.0 3.0 OUTPUT POWER vs. SUPPLY VOLTAGE 120 100 80 60 40 4.5 5.0 5.5 2.5 VPVDD = 3.3V fIN = 1kHz 3.
PAGE 8
MAX97220A–MAX97220E Differential Input DirectDrive Line Drivers/Headphone Amplifiers Typical Operating Characteristics (continued) (VPVDD = VSVDD = VSVDD2 = 5V, VPGND = VSGND = 0V, CBIAS = 0.1µF, C1 = C2 = 1µF, RIN = 10kω, RF = 10kω, unless otherwise noted.) 160 2 1 0 120 40 -1 -2 -3 0 -4 80 20 40 60 80 100 120 140 160 180 200 MAX97220A/MAX97220B AV = 0dB 0.01 0.
PAGE 9
MAX97220A–MAX97220E Differential Input DirectDrive Line Drivers/Headphone Amplifiers Typical Operating Characteristics (continued) (VPVDD = VSVDD = VSVDD2 = 5V, VPGND = VSGND = 0V, CBIAS = 0.1µF, C1 = C2 = 1µF, RIN = 10kω, RF = 10kω, unless otherwise noted.) POWER-SUPPLY REJECTION RATIO vs. FREQUENCY CROSSTALK vs. FREQUENCY C/D VERSIONS VRIPPLE = 200mVP-P -20 -40 -40 -50 -60 -70 -80 RIGHT TO LEFT LEFT TO RIGHT VPVDD = 3.3V RL = 32I -60 -80 -90 -100 -110 -100 VPVDD = 5V RL = 10kI -120 -120 0.
PAGE 10
MAX97220A–MAX97220E Differential Input DirectDrive Line Drivers/Headphone Amplifiers Typical Operating Characteristics (continued) (VPVDD = VSVDD = VSVDD2 = 5V, VPGND = VSGND = 0V, CBIAS = 0.1µF, C1 = C2 = 1µF, RIN = 10kω, RF = 10kω, unless otherwise noted.) SUPPLY CURRENT vs. SUPPLY VOLTAGE EXITING SHUTDOWN MAX97220 toc37 NO LOAD 9 MAX97220A/MAX97220C/MAX97220E OUT_ 5V/div 8 SUPPLY CURRENT (mA) SHDN 2V/div MAX97220 toc38 10 7 6 5 4 3 2 1 0 2.5 2ms/div 3.0 3.5 4.0 4.5 5.0 5.5 5.0 5.
PAGE 11
MAX97220A–MAX97220E Differential Input DirectDrive Line Drivers/Headphone Amplifiers BIAS OUTR SVDD2 TOP VIEW OUTL Pin Configuration 12 11 10 9 SVDD 13 INL- 14 MAX97220 INL+ 15 EP 1 2 3 4 C1P PGND C1N + PVDD SHDN 16 8 INR- 7 INR+ 6 SGND 5 PVSS TQFN Pin Description PIN NAME 1 PVDD FUNCTION Charge-Pump Power-Supply Input. Bypass to PGND with 1FF. 2 C1P 3 PGND 4 C1N Negative Flying Capacitor Connection. Connect a 1FF capacitor between C1P and C1N.
PAGE 12
MAX97220A–MAX97220E Differential Input DirectDrive Line Drivers/Headphone Amplifiers Detailed Description The MAX97220_ is a fully differential input line driver/ headphone amplifier for set-top boxes, LCD TV, and home theater applications where audio fidelity is of primary importance. Power consumption of the amplifier is reduced while maintaining high SNR and THD+N performance. The MAX97220A/MAX97220B/MAX97220E require external input and feedback resistors to set amplifier gain.
PAGE 13
MAX97220A–MAX97220E Differential Input DirectDrive Line Drivers/Headphone Amplifiers filter that removes the DC bias from an incoming signal. The AC-coupling capacitor allows the amplifier to bias the signal to an optimum DC level. Assuming zerosource impedance, the -3dB point of the highpass filter is given by: RF1* OUT AUDIO CODEC GND IN- IN+ RIN1* OUT RIN2 f-3dB = RF2 RIN1 = RIN2, RF1 = RF2 *RIN1 AND RF1 ARE INTERNAL FOR MAX97220C/MAX97220D Figure 3.
PAGE 14
MAX97220A–MAX97220E Differential Input DirectDrive Line Drivers/Headphone Amplifiers Applications Information T − TA PD(MAX) = J(MAX) qJA MAX9722 Compatibility The MAX97220_ is compatible with the footprint of the MAX9722. BIAS on the MAX97220_ is in the same position as SVSS. On the MAX9722, SVSS is connected to PVSS. For the MAX97220_, there is only one chargepump output that doubles as the amplifier’s negative power-supply input.
PAGE 15
MAX97220A–MAX97220E Differential Input DirectDrive Line Drivers/Headphone Amplifiers Thermal-overload protection limits total power dissipation in the IC. When the junction temperature exceeds +160NC, the thermal protection circuitry disables the amplifier. Operation returns to normal once the die cools by 15NC. Charge-Pump Capacitor Selection Use capacitors with an ESR less than 100mI for optimum performance. Low-ESR ceramic capacitors minimize the output resistance of the charge pump.
PAGE 16
MAX97220A–MAX97220E Differential Input DirectDrive Line Drivers/Headphone Amplifiers Functional Diagrams 2.5V TO 5.5V 2.5V TO 5.5V 1µF 1µF 1µF 10kI 0.47µF 10kI PVDD SVDD -INL 0.47µF 10kI 10kI 10kI 10kI MAX97220A MAX97220B MAX97220E CHARGE PUMP C1N 0.47µF SHDN SGND PGND +INR 10kI 20kI CHARGE PUMP 20kI C1 1µF C1N PVSS C2 1µF OUTR -INR 0.47µF CBIAS 0.1µF OUTL BIAS C1P MAX97220C MAX97220D OUTR 10kI 10kI 0.47µF C2 1µF 10kI +INL C1 1µF PVSS +INR -INR 0.47µF CBIAS 0.
PAGE 17
MAX97220A–MAX97220E Differential Input DirectDrive Line Drivers/Headphone Amplifiers Package Information For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status. PACKAGE TYPE PACKAGE CODE 16 TQFN T1633-4 Maxim Integrated OUTLINE NO.
PAGE 18
MAX97220A–MAX97220E Differential Input DirectDrive Line Drivers/Headphone Amplifiers Package Information (continued) For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status.
PAGE 19
MAX97220A–MAX97220E Differential Input DirectDrive Line Drivers/Headphone Amplifiers Revision History REVISION NUMBER REVISION DATE 0 1/11 Initial release 1 10/11 Added top marks to Ordering Information, added B/C/D versions to Quiescent Supply Current, Output Signal Attenuation in Shutdown, and Power-Supply Rejection Ratio in the Electrical Characteristics table 2 7/12 Added MAX97220E DESCRIPTION PAGES CHANGED — 1, 2, 3 1–19 Maxim cannot assume responsibility for use of any circuitry other tha