View MAX97220A_18516.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

19-5611; Rev 0; 1/11
TION KIT EVALUA BLE ILA AVA
Differential Input DirectDrive Line Drivers/Headphone Amplifiers
Features
S Output Power 125mW into 32I with a 5V Supply 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 Flat THD+N, Better Than 90dB in the Audio Band S 18-Bit SNR Performance, 112dB S Footprint Compatible with the MAX9722
General Description
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. Two versions of the IC are available with different turnon times (tON). The A and C 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. 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. DirectDrive(R)
MAX97220A-MAX97220D
Ordering Information
PART MAX97220AETE+ MAX97220BETE+ MAX97220CETE+ MAX97220DETE+ PINPACKAGE 16 TQFN-EP* 16 TQFN-EP* 16 TQFN-EP* 16 TQFN-EP* GAIN SET External External +6dB +6dB TURN-ON TIME (ms) 5.5 130 5.5 130
Applications
Simple Multimedia Interfaces Set-Top Boxes Blu-rayK and DVD Players LCD Televisions Prosumer Audio Devices
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. Functional Diagrams appear at end of data sheet.
Simplified Block Diagrams
RF RIN LEFT AUDIO INPUT RIN RF OUTL RIN
INLOUTL
INLLEFT AUDIO INPUT INL+
RIN
INL+ RF
RF
MAX97220A/B
RIN RIGHT AUDIO INPUT RIN RF INR+ OUTR INRRIGHT AUDIO INPUT INR+ RIN RF
MAX97220C/D
SGND SGND OUTR
INR-
RIN RF
RF
_______________________________________________________________ Maxim Integrated Products 1
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.
Differential Input DirectDrive Line Drivers/Headphone Amplifiers MAX97220A-MAX97220D
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 and B) .... -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) ..........48C/W Junction-to-Case Thermal Resistance (qJC) .................7C/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 = 0.1F, C1 = C2 = 1F, RIN = 20k, RF = 20k (MAX97220A/ MAX97220B), typical values tested at TA = +25C, unless otherwise noted.) (Notes 2 and 3) PARAMETER GENERAL Supply Voltage Range Quiescent Supply Current Undervoltage Lockout Shutdown Supply Current Turn-On Time AMPLIFIERS Input Resistance Output Signal Attenuation in Shutdown Gain Output Offset Voltage Input Common-Mode Voltage Range Maximum Differential Input Signal 2 AV VOS RIN C/D versions only VSHDN = 0V, RL = 10kW C/D versions only Unity gain, TA = +25NC A/B versions VCM Voltage at IN+ and INC/D versions VDIFF (Note 4) -0.5 x VPVDD -0.75 x VPVDD A/B versions C/D versions 5.5 7.4 10 76 45 6 6.5 350 +0.5 x VPVDD +0.75 x VPVDD PVDD 12.7 kI dB dB FV PVDD, SVDD_ IPVDD UVLO IPVDD_SD tON Guaranteed by PSRR test No load, TA = +25NC No load, VPVDD = VSVDD_ = 3.3V PVDD falling SHDN = 0, TA = +25NC Shutdown to full operation time A/C versions B/D versions 4.8 117 1 5.5 130 2.5 5.5 5 2.35 10 6.3 143 5.5 7 V mA V FA ms SYMBOL CONDITIONS MIN TYP MAX UNITS
V
VP
Differential Input DirectDrive Line Drivers/Headphone Amplifiers
ELECTRICAL CHARACTERISTICS (continued)
(VPVDD = VSVDD = VSVDD2 = 5V, VPGND = VSGND = 0V, CBIAS = 0.1F, C1 = C2 = 1F, RIN = 20k, RF = 20k (MAX97220A/ MAX97220B), typical values tested at TA = +25C, unless otherwise noted.) (Notes 2 and 3) PARAMETER Power-Supply Rejection Ratio SYMBOL PSRR CONDITIONS VPVDD = VSVDD_ = 2.5V to 5.5V fIN = 217Hz, 200mVP-P ripple fIN = 10kHz, 200mVP-P ripple -VPVDD/2 P VCM P +VPVDD/2 -0.75 x VPVDD P VCM P +0.75 x VPVDD A/B versions C/D versions 70 45 3 2.15 3.5 40 110 125 103 90 dB 80 105 94 0.0035 % mW VRMS MIN 74 TYP 90 78 63 86 dB 60 dB MAX UNITS
MAX97220A-MAX97220D
Common-Mode Rejection Ratio
CMRR
1kHz, 600I load, THD+N < 0.1% Output Voltage Swing VOUT 1kHz, RL = 600I load, VPVDD = VSVDD_ = 3.3V, THD+N < 0.1% 1kHz, RL = 10kI load, THD+N < 0.1% Output Power POUT RL = 16I, THD+N = 1% RL = 32I, THD+N = 1% 1kHz, 22Hz to 22kHz BW, VOUT = 3VRMS, RL = 10kI 10kHz, 22Hz to 22kHz BW, VOUT = 3VRMS, RL = 10kI Total Harmonic Distortion Plus Noise THD+N 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 VOUT = 3VRMS, THD+N = 0.1%, A-weighted, RIN = RF = 10kI, RL = 1kI VOUT = 2VRMS, VPVDD = 3.3V, THD+N = 0.1%, A-weighted, RIN = RF = 10kI, RL = 600I VOUT = 3VRMS, THD+N = 0.1%, A-weighted, RL = 1kI VOUT = 2VRMS, VPVDD = 3.3V, THD+N = 0.1%, A-weighted, RL = 600I
112.5
A/B versions Signal-to-Noise Ratio SNR
109 dB 106
C/D versions
103
3
Differential Input DirectDrive Line Drivers/Headphone Amplifiers MAX97220A-MAX97220D
ELECTRICAL CHARACTERISTICS (continued)
(VPVDD = VSVDD = VSVDD2 = 5V, VPGND = VSGND = 0V, CBIAS = 0.1F, C1 = C2 = 1F, RIN = 20k, RF = 20k (MAX97220A/ MAX97220B), typical values tested at TA = +25C, unless otherwise noted.) (Notes 2 and 3) PARAMETER SYMBOL A/B versions C/D versions CONDITIONS A-weighted, RIN = RF = 10kI A-weighted 1kHz, VOUT = 3VRMS, RL = 10kI 10kHz, VOUT = 3VRMS, RL = 10kI 1kHz, VOUT = 2VRMS, RL = 600I, VPVDD = VSVDD_ = 3.3V 10kHz, VOUT = 2VRMS, RL = 600I, VPVDD = VSVDD_ = 3.3V 1kHz, POUT = 20mW, RL = 32I Crosstalk XTALK 10kHz, POUT = 20mW, RL = 32I 1kHz, VOUT = 2VRMS, RL = 10kI 10kHz, VOUT = 2VRMS, RL = 10kI C/D versions 1kHz, VOUT = 2VRMS, RL = 600I 10kHz, VOUT = 2VRMS, RL = 600I 1kHz, POUT = 20mW, RL = 32I 1kHz, POUT = 20mW, RL = 16I Maximum Capacitive Load Drive External Feedback Resistor Range Oscillator Frequency CL RF fOSC A/B versions 4.7 450 MIN TYP 7 FV 14 -125 -108 MAX UNITS
Output Noise Voltage
VN
-123
A/B versions
-104
-102 -82 100 98 100 96 95 92 470 20 500 100 550 pF kI kHz dB
4
Differential Input DirectDrive Line Drivers/Headphone Amplifiers
ELECTRICAL CHARACTERISTICS (continued)
(VPVDD = VSVDD = VSVDD2 = 5V, VPGND = VSGND = 0V, CBIAS = 0.1F, C1 = C2 = 1F, RIN = 20k, RF = 20k (MAX97220A/ MAX97220B), typical values tested at TA = +25C, unless otherwise noted.) (Notes 2 and 3) PARAMETER SYMBOL CONDITIONS 32 samples per second, A-weighted, RL = 10kI, unity gain 32 samples per second, A-weighted, RL = 32I, unity gain Into shutdown Out of shutdown Into shutdown Out of shutdown 1.4 0.4 TA = +25NC TA = +25NC 1 1 MIN TYP -70 -70 -76 -76 dBV MAX UNITS
MAX97220A-MAX97220D
Click-and-Pop Level (Note 5)
KCP
LOGIC INPUT (SHDN) SHDN Input Logic-High SHDN Input Logic-Low SHDN Input Leakage Current High SHDN Input Leakage Current Low
VIH VIL IIH IIL
V V FA 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 = 0.1F, C1 = C2 = 1F, RIN = 10k, RF = 10k, unless otherwise noted.)
TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY
MAX97220 toc01
TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY
VPVDD = 5V RL = 10kI BW = 22Hz TO 22kHz
MAX97220 toc02
TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY
VPVDD = 3.3V RL = 32I
MAX97220 toc03
0 -10 -20 -30 THD+N (dB) -40 -50 -60 -70 -80 -90 -100 -110 -120
VPVDD = 3.3V RL = 600I BW = 22Hz TO 22kHz
0 -10 -20 -30 THD+N (dB) -40 -50 -60 -70 -80 -90 -100 -110 -120
100 10 1 THD+N (%) 0.1
POUT = 30mW 0.01
VOUT = 1VRMS
VOUT = 1VRMS
0.001 VOUT = 3VRMS 0.01 0.1 1 FREQUENCY (kHz) 10 100 0.0001 0.01 0.1 POUT = 10mW 1 FREQUENCY (kHz) 10 100
VOUT = 2VRMS 0.01 0.1 1 FREQUENCY (kHz) 10 100
5
Differential Input DirectDrive Line Drivers/Headphone Amplifiers MAX97220A-MAX97220D
Typical Operating Characteristics (continued)
(VPVDD = VSVDD = VSVDD2 = 5V, VPGND = VSGND = 0V, CBIAS = 0.1F, C1 = C2 = 1F, RIN = 10k, RF = 10k, unless otherwise noted.)
TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY
MAX97220 toc04
TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY
MAX97220 toc05
TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY
VPVDD = 5V RL = 16I
MAX97220 toc06
100 10 1 THD+N (%)
VPVDD = 5V RL = 32I
100 10 1 THD+N (%) 0.1 0.01 0.001
VPVDD = 3.3V RL = 16I
100 10 1 THD+N (%) 0.1 0.01 0.001
POUT = 80mW
0.1 POUT = 20mW 0.01
POUT = 25mW
0.001 0.0001 0.01 0.1 POUT = 90mW 1 FREQUENCY (kHz) 10 100
POUT = 20mW
POUT = 10mW 0.0001 0.01 0.1 1 FREQUENCY (kHz) 10 100 0.0001 0.01 0.1 1 FREQUENCY (kHz) 10 100
TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT VOLTAGE
0 -10 -20 -30 -40 -50 -60 -70 -80 -90 -100 -110 -120 -130 0 VPVDD = 3.3V RL = 600I 0 -10 -20 -30 -40 -50 -60 -70 -80 -90 -100 -110 -120 -130 -140 0
MAX97220 toc07
TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT VOLTAGE
MAX97220 toc08
TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT POWER
VPVDD = 3.3V RL = 32I
MAX97220 toc09
VPVDD = 5V RL = 10kI
100 10 1
THD+N (dB)
THD+N (dB)
fIN = 1kHz
fIN = 10kHz
THD+N (%)
0.1 0.01 fIN = 1kHz
fIN = 10kHz
0.001 fIN = 1kHz 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 OUTPUT VOLTAGE (VRMS) 0.0001 0 fIN = 300Hz 10 20 30 40 50 60 OUTPUT POWER (mW)
0.5
1.0
1.5
2.0
2.5
3.0
OUTPUT VOLTAGE (VRMS)
TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT POWER
MAX97220 toc10
TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT POWER
MAX97220 toc11
TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT POWER
VPVDD = 5V RL = 16I
MAX97220 toc12
100 10 1 THD+N (%)
VPVDD = 5V RL = 32I
100 10 1 THD+N (%) 0.1 0.01 0.001
VPVDD = 3.3V RL = 16I
100 10 1 THD+N (%) 0.1
0.1 fIN = 1kHz 0.01
FREQ = 1kHz
FREQ = 1kHz 0.01
0.001 fIN = 300Hz 0.0001 0 20 40 60 80 100 120 140 160 180 OUTPUT POWER (mW)
0.001 FREQ = 300Hz FREQ = 300Hz 0.0001 0 10 20 30 40 50 60 0 20 40 60 80 100 120 140 160 OUTPUT POWER (mW) OUTPUT POWER (mW)
0.0001
6
Differential Input DirectDrive Line Drivers/Headphone Amplifiers
Typical Operating Characteristics (continued)
(VPVDD = VSVDD = VSVDD2 = 5V, VPGND = VSGND = 0V, CBIAS = 0.1F, C1 = C2 = 1F, RIN = 10k, RF = 10k, unless otherwise noted.)
MAX97220A-MAX97220D
OUTPUT VOLTAGE vs. SUPPLY VOLTAGE
MAX97220 toc13
OUTPUT VOLTAGE vs. SUPPLY VOLTAGE
MAX97220 toc14
OUTPUT POWER vs. SUPPLY VOLTAGE
225 200 OUTPUT POWER (mW) 175 150 125 100 75 50 25 0 THD+N = 1% fIN = 1kHz RL = 32I THD+N = 10%
MAX97220 toc15
5.0 4.5 OUTPUT VOLTAGE (VRMS) 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0 2.5 3.0 3.5 4.0 4.5 5.0 THD+N = 1% fIN = 1kHz RL = 600I THD+N = 10%
5.0 4.5 OUTPUT VOLTAGE (VRMS) 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0 THD+N = 1% fIN = 1kHz RL = 10kI THD+N = 10%
250
5.5
2.5
3.0
3.5
4.0
4.5
5.0
5.5
2.5
3.0
3.5
4.0
4.5
5.0
5.5
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
OUTPUT POWER vs. SUPPLY VOLTAGE
MAX97220 toc16
OUTPUT VOLTAGE vs. LOAD RESISTANCE
MAX97220 toc17
OUTPUT VOLTAGE vs. LOAD RESISTANCE
VPVDD = 5V fIN = 1kHz THD+N = 10%
MAX97220 toc18
200 180 160 OUTPUT POWER (mW) 140 120 100 80 60 40 20 0 2.5 3.0 3.5 4.0 4.5 5.0 THD+N = 1% fIN = 1kHz RL = 16I THD+N = 10%
4.0 3.5 OUTPUT VOLTAGE (VRMS) 3.0 2.5 2.0 THD+N = 1% 1.5 1.0 VPVDD = 3.3V fIN = 1kHz THD+N = 10%
5.0 4.5 OUTPUT VOLTAGE (VRMS) 4.0 3.5 3.0 2.5 2.0
THD+N = 1%
5.5
0.1
1
10
100
0.1
1
10
100
SUPPLY VOLTAGE (V)
LOAD RESISTANCE (kI)
LOAD RESISTANCE (kI)
OUTPUT POWER vs. LOAD RESISTANCE
MAX97220 toc19
OUTPUT POWER vs. LOAD RESISTANCE
MAX97220 toc20
POWER DISSIPATION vs. OUTPUT POWER
180 POWER DISSIPATION (mW) 160 140 120 100 80 60 40 20 0 VPVDD = 3.3V RL = 32I
MAX97220 toc21
100 90 80 OUTPUT POWER (mW) 70 60 50 40 30 20 10 0 10 100 LOAD RESISTANCE (I) THD+N = 1% VPVDD = 3.3V fIN = 1kHz THD+N = 10%
250 225 200 OUTPUT POWER (mW) 175 150 125 100 75 50 25 fIN = 1kHz 10 100 LOAD RESISTANCE (I) 0 THD+N = 1% THD+N = 10%
200
1000
1000
0
15 30 45 60 75 90 105 120 135 150 OUTPUT POWER (mW)
7
Differential Input DirectDrive Line Drivers/Headphone Amplifiers MAX97220A-MAX97220D
Typical Operating Characteristics (continued)
(VPVDD = VSVDD = VSVDD2 = 5V, VPGND = VSGND = 0V, CBIAS = 0.1F, C1 = C2 = 1F, RIN = 10k, RF = 10k, unless otherwise noted.)
POWER DISSIPATION vs. OUTPUT POWER
MAX97220 toc22
GAIN FLATNESS vs. FREQUENCY
MAX97220 toc23
CROSSTALK vs. FREQUENCY
0 -10 -20 -30 -40 -50 -60 -70 -80 -90 -100 -110 -120 -130 -140 VPVDD = 3.3V RL = 600I VOUT = 2VRMS
MAX97220 toc24
400 360 POWER DISSIPATION (mW) 320 280 200 160 120 80 40 0 0 240 VPVDD = 5V RL = 32I
8 7 6 5 GAIN (dB) 4 3 2 1 0 -1 -2 -3 MAX97220A/MAX97220B AV = 0dB 0.01 0.1 1 10 100 MAX97220C/MAX97220D AV = 6dB
CROSSTALK (dB)
RIGHT TO LEFT
20 40 60 80 100 120 140 160 180 200 OUTPUT POWER (mW)
-4 1000 FREQUENCY (kHz)
LEFT TO RIGHT 0.01 0.1 1 FREQUENCY (kHz) 10 100
CROSSTALK vs. FREQUENCY
0 -10 -20 -30 -40 -50 -60 -70 -80 -90 -100 -110 -120 -130 -140 RL = 10kI VOUT = 3VRMS 0 -10 -20 -30 -40 -50 -60 -70 -80 -90 -100 -110 -120 -130 -140
MAX97220 toc25
CROSSTALK vs. FREQUENCY
RL = 32I POUT = 20mW 0 -10 -20 -30 -40 -50 -60 -70 -80 -90 -100 -110 -120 -130 -140
MAX97220 toc26
CROSSTALK vs. FREQUENCY
RL = 16I POUT = 20mW
MAX97220 toc27
CROSSTALK (dB)
CROSSTALK (dB)
CROSSTALK (dB)
RIGHT TO LEFT
RIGHT TO LEFT
RIGHT TO LEFT
LEFT TO RIGHT 0.01 0.1 1 FREQUENCY (kHz) 10 100
LEFT TO RIGHT 0.01 0.1 1 FREQUENCY (kHz) 10 100
LEFT TO RIGHT 0.01 0.1 1 FREQUENCY (kHz) 10 100
CROSSTALK vs. FREQUENCY C/D VERSIONS
MAX97220 toc28
CROSSTALK vs. FREQUENCY C/D VERSIONS
MAX97220 toc29
CROSSTALK vs. FREQUENCY C/D VERSIONS
RL = 32I POUT = 20mW
MAX97220 toc30
0 -10 -20 -30 CROSSTALK (dB) -40 -50 -60 -70 -80 -90 -100 -110 -120
VPVDD = 3.3V RL = 600I VOUT = 2VRMS
0 -10 -20 -30 CROSSTALK (dB) -40 -50 -60 -70 -80 -90 -100 -110 -120
RL = 10kI VOUT = 2VRMS
0 -10 -20 -30 CROSSTALK (dB) -40 -50 -60 -70 -80 -90 -100 -110 -120
LEFT TO RIGHT
RIGHT TO LEFT
LEFT TO RIGHT
RIGHT TO LEFT
LEFT TO RIGHT
RIGHT TO LEFT
0.01
0.1
1 FREQUENCY (kHz)
10
100
0.01
0.1
1 FREQUENCY (kHz)
10
100
0.01
0.1
1 FREQUENCY (kHz)
10
100
8
Differential Input DirectDrive Line Drivers/Headphone Amplifiers
Typical Operating Characteristics (continued)
(VPVDD = VSVDD = VSVDD2 = 5V, VPGND = VSGND = 0V, CBIAS = 0.1F, C1 = C2 = 1F, RIN = 10k, RF = 10k, unless otherwise noted.)
MAX97220A-MAX97220D
CROSSTALK vs. FREQUENCY C/D VERSIONS
RL = 16I POUT = 20mW
MAX97220 toc31
POWER-SUPPLY REJECTION RATIO vs. FREQUENCY
VRIPPLE = 200mVP-P -20 -40 PSRR (dB) -60 -80 -100 -120 VPVDD = 5V RL = 10kI 0.01 0.1 1 FREQUENCY (kHz) 10 100 VPVDD = 3.3V RL = 32I
MAX97220 toc32
0 -10 -20 -30 CROSSTALK (dB) -40 -50 -60 -70 -80 -90 -100 -110 -120
0
RIGHT TO LEFT LEFT TO RIGHT
0.01
0.1
1 FREQUENCY (kHz)
10
100
COMMON-MODE REJECTION RATIO vs. FREQUENCY
MAX97220 toc33
COMMON-MODE REJECTION RATIO vs. FREQUENCY
0 -10 -20 -30 -40 -50 -60 -70 -80 -90 -100 -110 -120 0.01 0.1 1 FREQUENCY (kHz) 10 100
-10 -20 -30 CMRR (dB) -50 -60 -70 -80 -90 -100 0.01 -40
VPVDD = 3.3V RL = 32I
RL = 1kI
0.1
1 FREQUENCY (kHz)
10
100
CMRR (dB)
ENTERING SHUTDOWN
MAX97220 toc35
EXITING SHUTDOWN
MAX97220 toc36
MAX97220B/MAX97220D SHDN 2V/div
SHDN 2V/div
OUT_ 1V/div
40s/div
20ms/div
MAX97220 toc34
0
OUT_ 5V/div
9
Differential Input DirectDrive Line Drivers/Headphone Amplifiers MAX97220A-MAX97220D
Typical Operating Characteristics (continued)
(VPVDD = VSVDD = VSVDD2 = 5V, VPGND = VSGND = 0V, CBIAS = 0.1F, C1 = C2 = 1F, RIN = 10k, RF = 10k, unless otherwise noted.)
EXITING SHUTDOWN
MAX97220 toc37
SUPPLY CURRENT vs. SUPPLY VOLTAGE
9 SUPPLY CURRENT (mA) NO LOAD
MAX97220 toc38
MAX97220A/MAX97220C SHDN 2V/div
10 8 7 6 5 4 3 2 1 0
OUT_ 5V/div
2ms/div
2.5
3.0
3.5
4.0
4.5
5.0
5.5
SUPPLY VOLTAGE (V)
SUPPLY CURRENT vs. TEMPERATURE
9 8 SUPPLY CURRENT (mA) 7 6 5 4 3 2 1 0 -40 -15 10 35 60 85 TEMPERATURE (C) VPVDD = 3.3V VPVDD = 5V NO LOAD
MAX97220 toc39
SHUTDOWN CURRENT vs. SUPPLY VOLTAGE
1.4 SHUTDOWN CURRENT (A) 1.2 1.0 0.8 0.6 0.4 0.2 0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 SUPPLY VOLTAGE (V)
NO LOAD
SHUTDOWN CURRENT vs. TEMPERATURE
1.4 SHUTDOWN CURRENT (A) 1.2 1.0 0.8 0.6 0.4 0.2 0 -0.2 -40 -15 10 35 60 85 TEMPERATURE (C)
RF IMMUNITY vs. FREQUENCY
0 -10 -20 -30 -40 -50 -60 -70 -80 -90 -100 -110 -120 -130 100
MAX97220 toc41
NO LOAD
RL = 32I
VPVDD = 5V
RF IMMUNITY (dB)
LEFT CHANNEL
VPVDD = 3.3V
RIGHT CHANNEL
600
1100
1600
2100
2600
3100
FREQUENCY (MHz)
10
MAX97220 toc42
1.6
MAX97220 toc40
10
1.6
Differential Input DirectDrive Line Drivers/Headphone Amplifiers
Pin Configuration
TOP VIEW
SVDD2
MAX97220A-MAX97220D
OUTL
12
BIAS 11
OUTR 10
9
SVDD 13 INL- 14 INL+ 15 SHDN 16 +
8 7
INRINR+ SGND PVSS
MAX97220
EP
6 5
1 PVDD
2 C1P
3 PGND
4 C1N
TQFN
Pin Description
PIN 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 -- NAME PVDD C1P PGND C1N PVSS SGND INR+ INRSVDD2 OUTR BIAS OUTL SVDD INLINL+ SHDN EP FUNCTION Charge-Pump Power-Supply Input. Bypass to PGND with 1FF. Positive Flying Capacitor Connection. Connect a 1FF capacitor between C1P and C1N. Power Ground. Connect PGND and SGND together at the system ground plane. Negative Flying Capacitor Connection. Connect a 1FF capacitor between C1P and C1N. Negative Charge-Pump Output. Bypass to PGND with 1FF. Signal Ground. Connect PGND and SGND together at the system ground plane. Right Positive Polarity Input Right Negative Polarity Input Signal Path Power-Supply Input. Bypass to PGND with 1FF. Connect directly to PVDD. Right DirectDrive Output Internal Supply Node. Bypass to PGND with 0.1FF. Left DirectDrive Output Signal Path Power-Supply Input. Bypass to PGND with 1FF. Connect directly to PVDD. Left Negative Polarity Input Left Positive Polarity Input Active-Low Shutdown. Drive SHDN high for normal operation. Exposed Pad. Electrically connect to PGND or leave unconnected.
11
Differential Input DirectDrive Line Drivers/Headphone Amplifiers MAX97220A-MAX97220D
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 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 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. 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 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.
Differential Input
PVDD VOUT PVDD/2 PGND
CONVENTIONAL DRIVER-BIASING SCHEME RF1* +PVDD INRIN2 IN+ RF2 -PVDD DirectDrive BIASING SCHEME RIN1 = RIN2, RF1 = RF2 *RIN1 AND RF1 ARE INTERNAL FOR MAX97220C/MAX97220D OUT RIN1*
VOUT
PGND
Figure 1. Conventional Driver Output Waveform vs. MAX97220_ Output Waveform 12
Figure 2. Differential Input Configuration
Differential Input DirectDrive Line Drivers/Headphone Amplifiers
RF1* RIN1* IN-
OUT AUDIO CODEC GND
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:
OUT
MAX97220A-MAX97220D
IN+
RIN2
f-3dB =
RF2
1 2RINCIN
RIN1 = RIN2, RF1 = RF2 *RIN1 AND RF1 ARE INTERNAL FOR MAX97220C/MAX97220D
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. Bypass BIAS with a 0.1FF capacitor to PGND. Do not connect external loads to BIAS.
Figure 3. Pseudo-Differential Input Configuration
BIAS Capacitor
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. 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
DirectDrive
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. 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.
Charge Pump
Click-and-Pop Suppression
Input Filter
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 inputs are driven to PGND.
Shutdown
13
Differential Input DirectDrive Line Drivers/Headphone Amplifiers MAX97220A-MAX97220D
Applications Information
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). 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:
MAX9722 Compatibility
T - TA PD(MAX) = J(MAX) qJA 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) = 4VDD2 2RL
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.
Power Dissipation
2.5V TO 5.5V 1F 10kI 0.47F 10kI PVDD SVDD -INL OUTL +INL 0.47F 10kI 10kI CHARGE MAX97220A PUMP 0.47F 10kI 10kI +INR -INR 0.47F 10kI SHDN 10kI BIAS C1P C1 1F C1N PVSS OUTR 0.47F 10kI 10kI +INR -INR 0.47F 10kI OPEN 0.1F 0.47F 10kI 10kI 1F 0.47F 10kI 1F 10kI
2.5V TO 5.5V
1F PVDD SVDD
-INL OUTL +INL SVSS C1P CHARGE PUMP C1 1F C1N PVSS OUTR 1F
0I
MAX9722
C2 1F
1F
SGND PGND
SHDN 10kI
SGND PGND
Figure 4. MAX97220A vs. MAX9722 PCB Layout 14
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. 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. 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. The hold capacitor value and ESR directly affect the ripple at PVSS. Use a low-ESR 1FF capacitor for C2. 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. The gain of the MAX97220A/MAX97220B 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. 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-
Charge-Pump Capacitor Selection
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.
PCB Layout and Grounding
MAX97220A-MAX97220D
Flying Capacitor (C1)
Hold Capacitor (C2)
RF RIN LEFT AUDIO INPUT
Amplifier Gain
INLOUTL
RIN
INL+ RF
MAX97220A MAX97220B
Supply Bypassing
RF
Figure 5. Setting the MAX97220A/MAX97220B Gain
15
Differential Input DirectDrive Line Drivers/Headphone Amplifiers MAX97220A-MAX97220D
Functional Diagrams
2.5V TO 5.5V 1F 10kI 0.47F 10kI PVDD SVDD -INL +INL 0.47F 10kI 10kI OUTL BIAS C1P CBIAS 0.1F 0.47F C1 1F C1N PVSS OUTR 0.47F C2 1F 0.47F 1F 0.47F -INL +INL 10kI 20kI CHARGE PUMP 20kI C1 1F C1N PVSS OUTR 20kI 10kI SHDN SGND PGND C2 1F 10kI OUTL BIAS C1P CBIAS 0.1F 1F PVDD SVDD 20kI 1F 2.5V TO 5.5V
MAX97220A MAX97220B
0.47F 10kI 10kI +INR -INR 0.47F 10kI
CHARGE PUMP
MAX97220C MAX97220D
+INR -INR 10kI
SHDN SGND PGND 10kI
Chip Information
PROCESS: BiCMOS
16
Differential Input DirectDrive Line Drivers/Headphone Amplifiers
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.
PACKAGE TYPE 16 TQFN PACKAGE CODE T1633-4 OUTLINE NO. 21-0136 LAND PATTERN NO. 90-0031
MAX97220A-MAX97220D
17
Differential Input DirectDrive Line Drivers/Headphone Amplifiers MAX97220A-MAX97220D
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 History
REVISION NUMBER 0 REVISION DATE 1/11 Initial release DESCRIPTION PAGES CHANGED --
MAX97220A-MAX97220D
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.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
(c)
19
2011 Maxim Integrated Products
Maxim is a registered trademark of Maxim Integrated Products, Inc.

▲Up To Search▲

Price & Availability of MAX97220A

	To Download MAX97220A Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .