19-5611; Rev 2; 7/12 TION KIT EVALUA BLE IL AVA A Differential Input DirectDrive Line Drivers/Headphone Amplifiers DirectDrive® Features 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. The IC is offered with an internally 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 applications. The IC has exceptional THD+N over the full audio bandwidth. S Output Power 125mW into 32I with a 5V Supply Two versions of the IC are available with different turnon times (tON). The A, C, and E versions for headphone applications feature a tON of 5.5ms while the B and D versions, intended for set-top-box applications, feature a 130ms tON. An on-chip charge pump inverts the powersupply input, creating a negative rail. The output stage of the amplifier is powered between the positive input supply and the output of the charge pump. The bipolar supplies bias the output about ground, eliminating the need for large, distortion-introducing output coupling capacitors. The IC powers on and off without clicks or pops. S Flat THD+N, Better Than 90dB in the Audio Band 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 S 3VRMS Output Drive into 1kI with a 5V Supply S 2VRMS Output Drive into 600I with a 3.3V Supply S Fully Differential Inputs S Fixed or Externally Adjustable Gain with No Clicks or Pops S Wide 2.5V to 5.5V Operating Range S DirectDrive Outputs Eliminate DC-Blocking Capacitors S 18-Bit SNR Performance, 112dB S Footprint Compatible with the MAX9722 Ordering Information PINPACKAGE TOP MARK GAIN SET TURN-ON TIME (ms) +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 +6dB 5.5 PART MAX97220AETE+ 16 TQFN-EP* Note: All devices operate over the -40NC to +85NC temperature range. +Denotes a lead(Pb)-free/RoHS-compliant package. *EP = Exposed pad. DirectDrive is a registered trademark of Maxim Integrated Products, Inc. Blu-ray is a trademark of the Blu-ray Disc Association. Prosumer Audio Devices Functional Diagrams appear at end of data sheet. Simplified Block Diagrams RF RIN LEFT AUDIO INPUT INL- INLOUTL RIN INL+ LEFT AUDIO INPUT INL+ RF RIN OUTL RIN RF RF MAX97220C/D MAX97220A/B/E RIN RIGHT AUDIO INPUT RIN RF INR+ INR+ OUTR INR- RIGHT AUDIO INPUT RIN RF SGND SGND OUTR INR- RIN RF RF 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. 1 MAX97220A–MAX97220E General Description 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)........ (-0.75 x VSVDD) to (+0.75 x VSVDD) OUTL and OUTR...................................................-4.5V to +4.5V SHDN........................................................................-0.3V to +6V C1P.........................................................-0.3V to (VPVDD + 0.3V) C1N........................................................ (VPVSS - 0.3V) to +0.3V OUT_ Short Circuit to PGND......................................Continuous OUT_ Short Circuit to PVDD.......................................Continuous Short Circuit Between OUTL and OUTR....................Continuous Continuous Current Into/Out of All Pins..............................20mA Continuous Power Dissipation (TA = +70NC) (Multilayer Board) TQFN (derate 20.8mW/NC above +70NC)...............1666.7mW Junction Temperature......................................................+150NC Operating Temperature Range........................... -40NC to +85NC Storage Temperature Range............................. -65NC to +150NC Lead Temperature (soldering, 10s).................................+300NC Soldering Temperature (reflow).......................................+260NC Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. PACKAGE THERMAL CHARACTERISTICS (Note 1) TQFN Junction-to-Ambient Thermal Resistance (qJA)...........48°C/W Junction-to-Case Thermal Resistance (qJC)..................7°C/W Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a fourlayer board. For detailed information on package thermal considerations, refer to www.maxim-ic.com/thermal-tutorial. ELECTRICAL CHARACTERISTICS (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 SYMBOL CONDITIONS MIN TYP MAX UNITS 5.5 V GENERAL Supply Voltage Range PVDD, SVDD_ No load, TA = +25NC A version Quiescent Supply Current IPVDD No load, TA = +25NC B/C/D/E versions 5 UVLO No load, VPVDD = VSVDD_ = 3.3V PVDD falling SHDN = 0, TA = +25NC 1 Undervoltage Lockout Shutdown Supply Current Turn-On Time IPVDD_SD Guaranteed by PSRR test tON Shutdown to full operation time RIN C/D versions only 2.5 5.5 7 5 9 mA 2.35 V 10 FA A/C/E versions 4.8 5.5 6.3 B/D versions 117 130 143 7.4 10 12.7 ms AMPLIFIERS Input Resistance Output Signal Attenuation in Shutdown Gain Output Offset Voltage VSHDN = 0V, RL = 10kW AV VOS Input Common-Mode Voltage Range VCM Maximum Differential Input Signal VDIFF 2 A/B/E versions 76 C/D versions 71 C/D versions only 5.5 Unity gain, TA = +25NC dB 6.5 dB 350 FV A/B/E versions -0.5 x VPVDD +0.5 x VPVDD C/D versions -0.75 x VPVDD +0.75 x VPVDD Voltage at IN+ and IN- (Note 4) 6 kI PVDD V VP Differential Input DirectDrive Line Drivers/Headphone Amplifiers (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 5.5V A/B/E versions 74 90 VPVDD = VSVDD_ = 2.5V to 5.5V C/D versions 73 90 fIN = 217Hz, 200mVP-P ripple 78 fIN = 10kHz, 200mVP-P ripple 63 -VPVDD/2 P VCM P +VPVDD/2 A/B/E versions 70 86 -0.75 x VPVDD P VCM P +0.75 x VPVDD C/D versions 45 60 Total Harmonic Distortion Plus Noise POUT THD+N RL = 16I, THD+N = 1% 2.15 110 125 1kHz, 22Hz to 22kHz BW, VOUT = 3VRMS, RL = 10kI 103 10kHz, 22Hz to 22kHz BW, VOUT = 3VRMS, RL = 10kI 90 1kHz, 22Hz to 22kHz BW, VOUT = 2VRMS, RL = 600I 10kHz, 22Hz to 30kHz BW, VOUT = 2VRMS, RL = 600I 1kHz, 22Hz to 22kHz BW, POUT = 20mW, RL = 32I Signal-to-Noise Ratio SNR C/D versions dB VOUT = 3VRMS, THD+N = 0.1%, A-weighted, RIN = RF = 10kI, RL = 1kI VRMS 3.5 40 RL = 32I, THD+N = 1% A/B/E versions UNITS 3 1kHz, RL = 600I load, VPVDD = VSVDD_ = 3.3V, THD+N < 0.1% 1kHz, RL = 10kI load, THD+N < 0.1% Output Power MAX dB 1kHz, 600I load, THD+N < 0.1% Output Voltage Swing MIN mW dB 80 105 94 0.0035 % 112.5 VOUT = 2VRMS, VPVDD = 3.3V, THD+N = 0.1%, A-weighted, RIN = RF = 10kI, RL = 600I 109 VOUT = 3VRMS, THD+N = 0.1%, A-weighted, RL = 1kI 106 VOUT = 2VRMS, VPVDD = 3.3V, THD+N = 0.1%, A-weighted, RL = 600I 103 dB 3 MAX97220A–MAX97220E ELECTRICAL CHARACTERISTICS (continued) 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 Output Noise Voltage SYMBOL VN CONDITIONS A-weighted, RIN = RF = 10kI 7 C/D versions A-weighted 14 XTALK C/D versions Maximum Capacitive Load Drive CL External Feedback Resistor Range RF Oscillator Frequency 4 fOSC TYP A/B/E versions A/B/E versions Crosstalk MIN 1kHz, VOUT = 3VRMS, RL = 10kI -125 10kHz, VOUT = 3VRMS, RL = 10kI -108 1kHz, VOUT = 2VRMS, RL = 600I, VPVDD = VSVDD_ = 3.3V -123 10kHz, VOUT = 2VRMS, RL = 600I, VPVDD = VSVDD_ = 3.3V -104 1kHz, POUT = 20mW, RL = 32I -102 10kHz, POUT = 20mW, RL = 32I -82 1kHz, VOUT = 2VRMS, RL = 10kI 100 10kHz, VOUT = 2VRMS, RL = 10kI 98 1kHz, VOUT = 2VRMS, RL = 600I 100 10kHz, VOUT = 2VRMS, RL = 600I 96 1kHz, POUT = 20mW, RL = 32I 95 1kHz, POUT = 20mW, RL = 16I 92 MAX FV dB 470 A/B/E versions UNITS pF 4.7 20 100 kI 450 500 550 kHz Differential Input DirectDrive Line Drivers/Headphone Amplifiers (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 SYMBOL Click-and-Pop Level (Note 5) KCP LOGIC INPUT (SHDN) SHDN Input Logic-High VIH SHDN Input Logic-Low VIL SHDN Input Leakage Current High IIH SHDN Input Leakage Current Low IIL CONDITIONS MIN TYP 32 samples per second, A-weighted, RL = 10kI, unity gain Into shutdown -70 Out of shutdown -70 32 samples per second, A-weighted, RL = 32I, unity gain Into shutdown -76 Out of shutdown -76 MAX UNITS dBV 1.4 V 0.4 V TA = +25NC 1 FA TA = +25NC 1 FA Note 2: 100% production tested at TA = +25NC. Specifications over temperature limits are guaranteed by design. Note 3: Dynamic specifications are taken over 2.5V to 5.5V supply range. Inputs AC-coupled to PGND. Note 4: The maximum differential input signal does not cause any excess distortion due to violation of the common-mode input range. Note 5: Test performed with a resistive load connected to PGND. Mode transitions are controlled by SHDN. KCP level is calculated as 20 x log (peak voltage during mode transition, no input signal). Typical Operating Characteristics (VPVDD = VSVDD = VSVDD2 = 5V, VPGND = VSGND = 0V, CBIAS = 0.1µF, C1 = C2 = 1µF, RIN = 10kω, RF = 10kω, unless otherwise noted.) -40 -50 -60 -70 -80 -90 -100 -110 VOUT = 1VRMS VOUT = 2VRMS -120 0.01 0.1 1 FREQUENCY (kHz) 10 VPVDD = 5V RL = 10kI BW = 22Hz TO 22kHz 10 VPVDD = 3.3V RL = 32I 1 -40 -50 -60 -70 -80 -90 -100 -110 VOUT = 1VRMS 0.1 POUT = 30mW 0.01 0.001 VOUT = 3VRMS -120 100 100 MAX97220 toc03 -20 -30 TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY THD+N (%) VPVDD = 3.3V RL = 600I BW = 22Hz TO 22kHz THD+N (dB) THD+N (dB) -20 -30 0 -10 MAX97220 toc01 0 -10 TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY MAX97220 toc02 TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY 0.01 0.1 1 FREQUENCY (kHz) 10 POUT = 10mW 0.0001 100 0.01 0.1 1 10 100 FREQUENCY (kHz) 5 MAX97220A–MAX97220E ELECTRICAL CHARACTERISTICS (continued) Typical Operating Characteristics (continued) (VPVDD = VSVDD = VSVDD2 = 5V, VPGND = VSGND = 0V, CBIAS = 0.1µF, C1 = C2 = 1µF, RIN = 10kω, RF = 10kω, unless otherwise noted.) POUT = 20mW 1 0.1 POUT = 25mW 0.01 0.01 0.001 0.001 0.001 0.0001 10 100 0.0001 0.01 0.1 100 0.1 1 10 100 TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT POWER 1.5 2.0 2.5 THD+N (%) 0.001 100 MAX97220 toc10 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 0.01 40 60 80 100 120 140 160 180 OUTPUT POWER (mW) 20 30 40 50 TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT POWER TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT POWER 100 VPVDD = 5V RL = 16I 10 THD+N (%) 0.1 FREQ = 1kHz 60 0.1 FREQ = 1kHz 0.01 0.001 0.001 20 10 1 FREQ = 300Hz fIN = 300Hz 0.0001 0 OUTPUT POWER (mW) 0.01 0.001 fIN = 300Hz 0.0001 OUTPUT VOLTAGE (VRMS) VPVDD = 3.3V RL = 16I 10 THD+N (%) fIN = 1kHz fIN = 1kHz fIN = 1kHz 1 0.1 0.1 0.01 TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT POWER 1 MAX97220 toc08 fIN = 10kHz OUTPUT VOLTAGE (VRMS) VPVDD = 5V RL = 32I VPVDD = 3.3V RL = 32I 10 1 0 3.0 100 MAX97220 toc12 1.0 VPVDD = 5V RL = 10kI MAX97220 toc11 0.5 0 0 -10 -20 -30 -40 -50 -60 -70 -80 -90 -100 -110 -120 -130 -140 MAX97220 toc09 TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT VOLTAGE MAX97220 toc07 TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT VOLTAGE fIN = 10kHz 0 0.01 FREQUENCY (kHz) fIN = 1kHz 10 10 FREQUENCY (kHz) VPVDD = 3.3V RL = 600I 100 1 FREQUENCY (kHz) THD+N (dB) THD+N (dB) 0 -10 -20 -30 -40 -50 -60 -70 -80 -90 -100 -110 -120 -130 1 POUT = 20mW POUT = 10mW POUT = 90mW 0.1 POUT = 80mW 0.1 0.01 0.01 VPVDD = 5V RL = 16I 10 THD+N (%) 0.1 0.0001 6 100 1 THD+N (%) 1 THD+N (%) VPVDD = 3.3V RL = 16I 10 TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY MAX97220 toc06 VPVDD = 5V RL = 32I 10 100 MAX97220 toc04 100 TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY MAX97220 toc05 TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY THD+N (%) MAX97220A–MAX97220E Differential Input DirectDrive Line Drivers/Headphone Amplifiers FREQ = 300Hz 0.0001 0.0001 0 10 20 30 40 OUTPUT POWER (mW) 50 60 0 20 40 60 80 100 120 OUTPUT POWER (mW) 140 160 Differential Input DirectDrive Line Drivers/Headphone Amplifiers 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 3.5 THD+N = 1% THD+N = 10% 3.0 3.0 3.5 4.0 4.5 5.0 5.5 SUPPLY VOLTAGE (V) 4.0 OUTPUT VOLTAGE (VRMS) THD+N = 10% 140 4.0 OUTPUT VOLTAGE vs. LOAD RESISTANCE OUTPUT VOLTAGE vs. LOAD RESISTANCE MAX97220 toc16 fIN = 1kHz RL = 16I 160 3.5 SUPPLY VOLTAGE (V) 200 180 THD+N = 1% 0 2.5 5.5 2.5 2.0 THD+N = 1% 5.0 VPVDD = 5V fIN = 1kHz 4.5 OUTPUT VOLTAGE (VRMS) 3.5 MAX97220 toc17 3.0 THD+N = 10% 150 0.5 SUPPLY VOLTAGE (V) OUTPUT POWER (mW) 200 1.0 2.5 fIN = 1kHz RL = 32I 225 1.0 0 MAX97220 toc15 4.0 THD+N = 10% OUTPUT POWER (mW) 3.5 fIN = 1kHz RL = 10kI 4.5 OUTPUT POWER vs. SUPPLY VOLTAGE 250 MAX97220 toc14 THD+N = 10% OUTPUT VOLTAGE (VRMS) OUTPUT VOLTAGE (VRMS) 4.0 MAX97220 toc13 fIN = 1kHz RL = 600I 4.5 5.0 MAX97220 toc18 OUTPUT VOLTAGE vs. SUPPLY VOLTAGE 5.0 THD+N = 10% 4.0 3.5 THD+N = 1% 3.0 2.5 1.5 20 2.0 1.0 3.0 3.5 4.0 4.5 5.0 5.5 1 0.1 OUTPUT POWER vs. LOAD RESISTANCE THD+N = 10% 70 60 50 40 THD+N = 1% 30 20 MAX97220 toc20 THD+N = 10% 150 125 100 THD+N = 1% 75 100 LOAD RESISTANCE (I) 1000 100 200 VPVDD = 3.3V RL = 32I 180 160 140 120 100 80 60 40 25 0 10 175 10 POWER DISSIPATION vs. OUTPUT POWER 50 VPVDD = 3.3V fIN = 1kHz 10 200 OUTPUT POWER (mW) OUTPUT POWER (mW) 80 225 1 LOAD RESISTANCE (kI) OUTPUT POWER vs. LOAD RESISTANCE 250 MAX97220 toc19 90 0.1 100 LOAD RESISTANCE (kI) SUPPLY VOLTAGE (V) 100 10 POWER DISSIPATION (mW) 2.5 MAX97220 toc21 0 20 fIN = 1kHz 0 0 10 100 LOAD RESISTANCE (I) 1000 0 15 30 45 60 75 90 105 120 135 150 OUTPUT POWER (mW) 7 MAX97220A–MAX97220E Typical Operating Characteristics (continued) (VPVDD = VSVDD = VSVDD2 = 5V, VPGND = VSGND = 0V, CBIAS = 0.1µF, C1 = C2 = 1µF, RIN = 10kω, RF = 10kω, unless otherwise noted.) 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 0.1 OUTPUT POWER (mW) LEFT TO RIGHT 10 RIGHT TO LEFT LEFT TO RIGHT 0.1 1 10 10 0 -10 -20 -30 -40 -50 -60 -70 -80 -90 -100 -110 -120 -130 -140 100 RL = 16I POUT = 20mW RIGHT TO LEFT LEFT TO RIGHT 0.01 0.1 1 10 FREQUENCY (kHz) CROSSTALK vs. FREQUENCY C/D VERSIONS CROSSTALK vs. FREQUENCY C/D VERSIONS CROSSTALK vs. FREQUENCY C/D VERSIONS -20 -30 CROSSTALK (dB) -60 LEFT TO RIGHT 0 -10 RIGHT TO LEFT RL = 10kI VOUT = 2VRMS -40 -50 -60 -70 -80 LEFT TO RIGHT RIGHT TO LEFT 1 FREQUENCY (kHz) 10 100 -20 -30 RL = 32I POUT = 20mW -40 -50 -60 -70 -80 LEFT TO RIGHT RIGHT TO LEFT -120 -120 0.1 0 -10 100 -90 -100 -110 -90 -100 -110 -120 100 CROSSTALK vs. FREQUENCY CROSSTALK (dB) RL = 32I POUT = 20mW 0.01 1 FREQUENCY (kHz) MAX97220 toc26 0 -10 -20 -30 -40 -50 -60 -70 -80 -90 -100 -110 -120 -130 -140 100 -90 -100 -110 8 0.1 FREQUENCY (kHz) VPVDD = 3.3V RL = 600I VOUT = 2VRMS 0.01 0.01 1000 FREQUENCY (kHz) -40 -50 -70 -80 LEFT TO RIGHT MAX97220 toc30 -20 -30 CROSSTALK (dB) RIGHT TO LEFT 1 100 CROSSTALK (dB) 0 -10 MAX97220 toc25 RL = 10kI VOUT = 3VRMS 0.1 10 RIGHT TO LEFT CROSSTALK vs. FREQUENCY MAX97220 toc28 CROSSTALK (dB) CROSSTALK vs. FREQUENCY 0.01 1 VPVDD = 3.3V RL = 600I VOUT = 2VRMS FREQUENCY (kHz) MAX97220 toc29 0 0 -10 -20 -30 -40 -50 -60 -70 -80 -90 -100 -110 -120 -130 -140 CROSSTALK (dB) 200 MAX97220C/MAX97220D AV = 6dB 4 3 0 -10 -20 -30 -40 -50 -60 -70 -80 -90 -100 -110 -120 -130 -140 MAX97220 toc24 6 5 280 240 MAX97220 toc23 320 GAIN (dB) POWER DISSIPATION (mW) MAX97220 toc22 VPVDD = 5V RL = 32I 360 CROSSTALK vs. FREQUENCY GAIN FLATNESS vs. FREQUENCY 8 7 MAX97220 toc27 POWER DISSIPATION vs. OUTPUT POWER 400 CROSSTALK (dB) MAX97220A–MAX97220E Differential Input DirectDrive Line Drivers/Headphone Amplifiers 0.01 0.1 1 FREQUENCY (kHz) 10 100 0.01 0.1 1 FREQUENCY (kHz) 10 100 Differential Input DirectDrive Line Drivers/Headphone Amplifiers 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 0.01 0.1 1 10 0.01 100 0.1 1 10 FREQUENCY (kHz) COMMON-MODE REJECTION RATIO vs. FREQUENCY COMMON-MODE REJECTION RATIO vs. FREQUENCY MAX97220 toc33 0 VPVDD = 3.3V RL = 32I -20 -30 CMRR (dB) -40 -50 -60 -70 -80 -90 0.1 1 10 RL = 1kI -110 -120 -100 0.01 0 -10 -20 -30 -40 -50 -60 -70 -80 -90 -100 100 MAX97220 toc34 FREQUENCY (kHz) -10 CMRR (dB) MAX97220 toc32 RL = 16I POUT = 20mW PSRR (dB) CROSSTALK (dB) -20 -30 0 MAX97220 toc31 0 -10 100 0.01 FREQUENCY (kHz) 0.1 1 10 100 FREQUENCY (kHz) EXITING SHUTDOWN ENTERING SHUTDOWN MAX97220 toc36 MAX97220 toc35 MAX97220B/MAX97220D SHDN 2V/div SHDN 2V/div OUT_ 5V/div OUT_ 1V/div 40µs/div 20ms/div 9 MAX97220A–MAX97220E Typical Operating Characteristics (continued) (VPVDD = VSVDD = VSVDD2 = 5V, VPGND = VSGND = 0V, CBIAS = 0.1µF, C1 = C2 = 1µF, RIN = 10kω, RF = 10kω, unless otherwise noted.) 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 OUT_ 5V/div 8 SUPPLY CURRENT (mA) SHDN 2V/div MAX97220 toc38 10 MAX97220A/MAX97220C/MAX97220E 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 5.5 SUPPLY VOLTAGE (V) SHUTDOWN CURRENT vs. SUPPLY VOLTAGE 7 VPVDD = 5V 6 5 4 3 VPVDD = 3.3V 2 NO LOAD 1.4 1.2 1.0 0.8 0.6 0.4 0.2 1 0 0 -40 -15 10 35 60 2.5 85 3.0 SHUTDOWN CURRENT vs. TEMPERATURE NO LOAD 1.4 RF IMMUNITY (dB) 1.2 1.0 0.8 VPVDD = 5V 0.6 0.4 0.2 VPVDD = 3.3V 0 -0.2 -40 -15 10 35 TEMPERATURE (°C) 10 4.0 4.5 RF IMMUNITY vs. FREQUENCY MAX97220 toc41 1.6 3.5 SUPPLY VOLTAGE (V) TEMPERATURE (°C) 60 85 0 -10 -20 -30 -40 -50 -60 -70 -80 -90 -100 -110 -120 -130 MAX97220 toc42 SUPPLY CURRENT (mA) 8 1.6 MAX97220 toc40 NO LOAD 9 SHUTDOWN CURRENT (µA) 10 MAX97220 toc39 SUPPLY CURRENT vs. TEMPERATURE SHUTDOWN CURRENT (µA) MAX97220A–MAX97220E Differential Input DirectDrive Line Drivers/Headphone Amplifiers RL = 32I LEFT CHANNEL RIGHT CHANNEL 100 600 1100 1600 2100 FREQUENCY (MHz) 2600 3100 Differential Input DirectDrive Line Drivers/Headphone Amplifiers OUTL BIAS OUTR SVDD2 TOP VIEW 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. 5 PVSS Negative Charge-Pump Output. Bypass to PGND with 1FF. 6 SGND Signal Ground. Connect PGND and SGND together at the system ground plane. 7 INR+ Right Positive Polarity Input 8 INR- Right Negative Polarity Input 9 SVDD2 Signal Path Power-Supply Input. Bypass to PGND with 1FF. Connect directly to PVDD. 10 OUTR Right DirectDrive Output Positive Flying Capacitor Connection. Connect a 1FF capacitor between C1P and C1N. Power Ground. Connect PGND and SGND together at the system ground plane. 11 BIAS Internal Supply Node. Bypass to PGND with 0.1FF. 12 OUTL Left DirectDrive Output 13 SVDD Signal Path Power-Supply Input. Bypass to PGND with 1FF. Connect directly to PVDD. 14 INL- Left Negative Polarity Input 15 INL+ Left Positive Polarity Input 16 SHDN EP Active-Low Shutdown. Drive SHDN high for normal operation. Exposed Pad. Electrically connect to PGND or leave unconnected. — 11 MAX97220A–MAX97220E Pin Configuration 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. The MAX97220C/MAX97220D feature internal input and feedback resistors for a set gain of +6dB. Output swings of 3VRMS with a 5V supply and 2VRMS with a 3.3V supply are perfect for line driver applications. High fidelity is maintained through the differential input connection. An output noise voltage of 7FVRMS allows for 112dB SNR when powered from 5V and 109dB SNR when powered from 3.3V. The IC has better than 90dB THD+N across the entire audio bandwidth. The MAX97220_ operates from a single supply ranging from 2.5V to 5.5V. An on-chip charge pump inverts the positive supply (PVDD), creating an equal magnitude PVDD VOUT PVDD/2 PGND CONVENTIONAL DRIVER-BIASING SCHEME negative supply (PVSS). The headphone amplifiers operate from bipolar supplies with their outputs biased about PGND (Figure 1). The benefit of this PGND bias is that the amplifier outputs do not have a DC component, typically PVDD/2. The large DC-blocking capacitors required with conventional headphone amplifiers are unnecessary, thus conserving board space, reducing system cost, and improving frequency response. Output power of 125mW into 32I is achievable from a 5V supply. The device features an undervoltage lockout that prevents operation from an insufficient power supply and click-and-pop suppression that eliminates audible transients on startup and shutdown. Differential Input The IC can be configured as differential or pseudodifferential input amplifiers (Figures 2 and 3), making it compatible with all codecs. A differential input offers improved noise immunity over a single-ended input. In devices such as cellular phones, high-frequency signals from the RF transmitter can couple into the amplifier’s input traces. The signals appear at the amplifier’s inputs as common-mode noise. A differential input amplifier amplifies the difference of the two inputs while signals common to both inputs are cancelled. Configured differentially, the gain of the MAX97220A/MAX97220B/ MAX97220E is set by: AV = RF/RIN The common-mode rejection ratio (CMRR) is limited by the external resistor matching, and if used, input capacitor matching at low frequencies. For example, the worstcase variation of 1% tolerant resistors results in 40dB CMRR, while 0.1% resistors result in 60dB CMRR. For best matching, use resistor arrays. RF1* RIN1* +PVDD IN- VOUT PGND OUT RIN2 IN+ RF2 -PVDD DirectDrive BIASING SCHEME Figure 1. Conventional Driver Output Waveform vs. MAX97220_ Output Waveform 12 RIN1 = RIN2, RF1 = RF2 *RIN1 AND RF1 ARE INTERNAL FOR MAX97220C/MAX97220D Figure 2. Differential Input Configuration Differential Input DirectDrive Line Drivers/Headphone Amplifiers 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. Pseudo-Differential Input Configuration DirectDrive Conventional single-supply headphone amplifiers have their outputs biased about a nominal DC voltage (typically half the supply) for maximum dynamic range. Large coupling capacitors are needed to block this DC bias from the headphone. Without these capacitors, a significant amount of DC current flows to the headphone, resulting in unnecessary power dissipation and possible damage to both the headphone and the headphone amplifier. Maxim’s patented DirectDrive architecture uses a charge pump to create an internal negative supply voltage, allowing the IC's outputs to be biased about PGND. With no DC component, there is no need for the large DC-blocking capacitors. Instead of two large (220FF, typ) tantalum capacitors, the IC charge pump requires two small ceramic capacitors, conserving board space, reducing cost, and improving the frequency response of the headphone amplifier. Input Filter In addition to the cost and size disadvantages of DC-blocking capacitors required by conventional headphone amplifiers, these capacitors limit the amplifier’s low-frequency response and can distort the audio signal. If input capacitors are used, input capacitor CIN, in conjunction with internal input resistor RIN, forms a highpass 1 2πRINCIN Setting f-3dB too high affects the low-frequency response of the amplifier. Use capacitors with adequately low voltage coefficients, such as X7R ceramic capacitors with a high voltage rating. Capacitors with higher voltage coefficients result in increased distortion at low frequencies. BIAS Capacitor Bypass BIAS with a 0.1FF capacitor to PGND. Do not connect external loads to BIAS. Charge Pump The MAX97220_ features a low-noise charge pump. The 500kHz switching frequency is well beyond the audio range and, thus, does not interfere with the audio signals. The switch drivers feature a controlled switching speed that minimizes noise generated by turn-on and turn-off transients. By limiting the switching speed of the charge pump, the di/dt noise caused by the parasitic bond wire and trace inductance is minimized. The IC requires a 1FF flying capacitor between C1P and C1N and a 1FF hold capacitor from PVSS to PGND. Click-and-Pop Suppression The IC features Maxim’s industry-leading click-and-pop suppression circuitry. When entering shutdown, the amplifier outputs are high impedance to ground. This scheme minimizes the energy present in the audio band. Shutdown The IC features a 1FA low-power shutdown mode that reduces power consumption. When the active-low shutdown mode is entered, the device’s internal bias circuitry is disabled, the amplifier outputs go high impedance, and BIAS is driven to PGND. The MAX97220A/ MAX97220B/MAX97220E inputs are driven to PGND. 13 MAX97220A–MAX97220E 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* 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. The connection of negative chargepump output and amplifier negative power-supply input is internal on the MAX97220_ and external on the MAX9722. To implement a PCB that is compatible with both the MAX9722 and MAX97220_, put a capacitor pad from BIAS/SVSS (MAX97220_/MAX9722 pin 11) to PGND. Also, place a 0I resistor pad from BIAS/SVSS (MAX97220_/MAX9722 pin 11) to PVSS (pin 5 on both parts). Install the 0I resistor when the MAX9722 is used and leave the resistor out of circuit when the MAX97220_ is used (Figure 4). Power Dissipation While driving a headphone load, the IC dissipates a significant amount of power. The maximum power dissipation is given in the Continuous Power Dissipation of the Absolute Maximum Ratings section or can be calculated by the following equation: where TJ(MAX) is +150NC, TA is the ambient temperature, and BJA is the reciprocal of the derating factor in NC/W as specified in the Absolute Maximum Ratings section. Since the IC is a stereo amplifier, the total maximum internal power dissipation for a given VDD and load is given by the following equation: PD(MAX) = If the internal power dissipation for a given application exceeds the maximum allowed for a given package, reduce power dissipation by decreasing supply voltage, ambient temperature, input signal, or gain, or by increasing load impedance. The TQFN package features an exposed thermal pad on its underside. This pad lowers the package's thermal impedance by providing a direct heat conduction path from the die to the PCB. Connect the exposed thermal pad to PGND or an isolated plane. 2.5V TO 5.5V 2.5V TO 5.5V 1µF 1µF 1µF 10kI 0.47µF 10kI PVDD SVDD OUTL 10kI 10kI CHARGE MAX97220A PUMP 0.47µF 10kI 10kI 10kI SGND PGND 10kI Figure 4. MAX97220A vs. MAX9722 PCB Layout 14 SVSS C1P 10kI 10kI OPEN MAX9722 C1N OUTR SHDN +INL 0.47µF 0.47µF PVSS +INR -INR 0.47µF C1 1µF PVDD SVDD -INL OUTL 0.1µF BIAS C1P 1µF 10kI 0.47µF 10kI -INL +INL 0.47µF 4VDD2 π2RL 10kI 10kI C2 1µF 10kI C1 1µF 0I C1N PVSS +INR OUTR -INR 0.47µF CHARGE PUMP 1µF SHDN 10kI SGND PGND 1µF Differential Input DirectDrive Line Drivers/Headphone Amplifiers 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. For best performance over the extended temperature range, select capacitors with an X7R dielectric. Flying Capacitor (C1) The value of the flying capacitor (C1) affects the charge pump’s load regulation and output resistance. A C1 value that is too small degrades the device’s ability to provide sufficient current drive, which leads to a loss of output voltage. Increasing the value of C1 improves load regulation and reduces the charge-pump output resistance to an extent. Above 1FF, the on-resistance of the switches and the ESR of C1 and C2 dominate. Hold Capacitor (C2) PCB Layout and Grounding Good PCB layout is essential for optimizing performance. Use large traces for the power-supply inputs and amplifier outputs to minimize losses due to parasitic trace resistance and route heat away from the device. Good grounding improves audio performance, and prevents any digital switching noise from coupling into the audio. Connect PGND and SGND together at a single point on the PCB. Connect all components associated with the charge pump (C1 and C2) to the PGND plane. Connect PVDD and SVDD together at the device. Place capacitors C1 and C2 as close as possible to the device. Ensure the PCB layout is partisioned so that the large switching currents in the ground plane do not return through SGND and the traces and components in the audio signal path. Refer to the MAX97220 Evaluation Kit for layout guidelines. The IC is inherently designed for excellent RF immunity. For best performance, add ground fills around all signal traces on top or bottom PCB planes. Also, ensure a solid ground plane is used in multilayer PCB designs. The hold capacitor value and ESR directly affect the ripple at PVSS. Use a low-ESR 1FF capacitor for C2. RF Amplifier Gain The gain of the MAX97220C/MAX97220D is internally set at 6dB where all gain-setting resistors are integrated into the device. The internally set gain, in combination with DirectDrive, results in a headphone amplifier that requires only tiny 1FF capacitors to complete the amplifier circuit. RIN LEFT AUDIO INPUT INLOUTL RIN INL+ RF MAX97220A MAX97220B MAX97220E The gain of the MAX97220A/MAX97220B/MAX97220E amplifier is set externally as shown in Figure 5. The gain is: AV = -RF/RIN Choose feedback resistor values between the 4.7kI and 100kI range. Supply Bypassing Proper power-supply bypassing ensures low-noise, lowdistortion performance. Connect a 1FF ceramic capacitor from PVDD to PGND and a 1FF ceramic capacitor from SVDD to PGND. Add additional bulk capacitance as required by the application. Locate the bypass capacitor as close as possible to the device. RIN RIGHT AUDIO INPUT RIN RF INR+ OUTR INR- RF Figure 5. Setting the MAX97220A/MAX97220B/MAX97220E Gain 15 MAX97220A–MAX97220E 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. Differential Input DirectDrive Line Drivers/Headphone Amplifiers MAX97220A–MAX97220E 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 SHDN SGND PGND 10kI Chip Information PROCESS: BiCMOS 16 0.47µF +INR 10kI 20kI 0.47µF CHARGE PUMP 20kI C1 1µF C1N PVSS OUTR -INR 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 0.1µF OUTL BIAS C1P +INL 0.47µF 20kI 0.47µF -INL 1µF PVDD SVDD 20kI 10kI SHDN SGND PGND C2 1µF Differential Input DirectDrive Line Drivers/Headphone Amplifiers PACKAGE TYPE PACKAGE CODE 16 TQFN T1633-4 OUTLINE NO. 21-0136 LAND PATTERN NO. 90-0031 17 MAX97220A–MAX97220E Package Information For the latest package outline information and land patterns (footprints), go to www.maxim-ic.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. 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.maxim-ic.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. 18 Differential Input DirectDrive Line Drivers/Headphone Amplifiers 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 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. The parametric values (min and max limits) shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance. Maxim Integrated Products, Inc. 160 Rio Robles, San Jose, CA 95134 USA 1-408-601-1000 © 2012 Maxim Integrated Products 19 Maxim is a registered trademark of Maxim Integrated Products, Inc. MAX97220A–MAX97220E Revision History