LM4840

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LM4840 Stereo Audio Power Amplifiers with Digital Volume Control Input
LM4840 Stereo Audio Power Amplifiers with Digital Volume Control Input
LM4840 monolithic integrated circuit that provides digital volume control stereo bridged audio power amplifiers capable producing into (Note with less than 1.0% 2.2W into (Note with less than 1.0% THD. Boomer audio integrated circuits were designed specifically provide high quality audio while requiring minimum amount external components. LM4840 incorporates digital volume control, stereo bridged audio power amplifiers, input mux, last volume level memory function save volume setting during shutdown. These features make optimally suited multimedia monitors, portable radios, desktop, portable computer applications. LM4840 features externally controlled, low-power consumption shutdown mode, both power amplifier headphone mute maximum system flexibility performance.
Note When properly mounted circuit board, LM4840LQ LM4840MH will deliver into LM4840MT will deliver 1.1W into Application Information section LM4840LQ LM4840MH usage information. Note LM4840LQ LM4840MH that have been properly mounted circuit board forced-air cooled will deliver 2.2W into
Specifications
THD+N into (LM4840LQ, LM4840MH) 2.2W (typ) into (LM4840LQ, LM4840MH) 2.0W (typ) into (LM4840) 1.1W (typ) Single-ended mode THD+N 85mW into 1.0% (typ) Shutdown current 0.2µA (typ)
Features
PC98 PC99 Compliant Digital Volume Control Interface System Beep Detect Stereo switchable bridged/single-ended power amplifiers "Click pop" suppression circuitry Thermal shutdown protection circuitry Input Capless headphone drivers Last volume memory from shutdown
Applications
Portable Desktop Computers Multimedia Monitors Portable Radios, PDAs, Portable
Connection Diagram
Package
DS200104-35
View Order Number LM4840LQ Package Number LQA028A Exposed-DAP
Boomer registered trademark NationalSemiconductor Corporation.
2001 National Semiconductor Corporation
DS200104
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LM4840
Connection Diagram
(Continued) TSSOP Package
DS200104-2
View Order Number LM4840MT Package Number MTC28 TSSOP Order Number LM4840MH Package Number MXA28A Exposed-DAP TSSOP
Block Diagram
DS200104-1
FIGURE LM4840 Block Diagram
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LM4840
Absolute Maximum Ratings (Note
Military/Aerospace specified devices required, please contact National Semiconductor Sales Office/ Distributors availability specifications. Supply Voltage Storage Temperature Input Voltage Power Dissipation Susceptibility (Note Susceptibility (Note Junction Temperature Soldering Information Small Outline Package Vapor Phase sec.) Infrared sec.) 6.0V -65°C +150°C -0.3V +0.3V Internally limited 2000V 200V 150°C
(typ) LQA028A (Note (typ) LQA028A (Note (typ) MTC28 (typ) MTC28 (typ) MXA28A (typ) MXA28A (Note (typ) MXA28A (Note (typ) MXA28A (Note (typ) MXA28A (Note
3°C/W 42°C/W 20°C/W 80°C/W 2°C/W 41°C/W 54°C/W 59°C/W 93°C/W
Operating Ratings
215°C 220°C Temperature Range TMIN TMAX Supply Voltage -40°C 85°C 2.7V 5.5V
AN-450 "Surface Mounting their Effects Product Reliability" other methods soldering surface mount devices. AN-1187 "Leadless Leadframe Package" detailed information usage devices.
Electrical Characteristics Entire
(Notes following specifications apply unless otherwise noted. Limits apply 25°C. LM4840 Symbol Parameter Supply Voltage Quiescent Power Supply Current Shutdown Current Headphone Sense High Input Voltage Headphone Sense Input Voltage VSHUTDOWN Conditions Typical (Note Limit (Note Units (Limits) (min) (max) (max) (max) (min) (max)
Electrical Characteristics Volume Attenuators
(Notes following specifications apply Limits apply 25°C. LM4840 Symbol CRANGE Parameter Attenuator Range Mute Attenuation Conditions Gain with Digital Volume Attenuation with Digital Volume VMUTE VDD, Bridged Mode VMUTE VDD, Single-Ended Mode Typical (Note Limit (Note Units (Limits) (max) (min) (min) (min)
Electrical Characteristics Single-Ended Mode Operation
(Notes following specifications apply Limits apply 25°C. LM4840 Symbol Parameter Output Power Conditions 1.0%; 1kHz; 10%; kHz; Typical (Note Limit (Note Units (Limits)
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LM4840
Electrical Characteristics Single-Ended Mode Operation
(Notes following specifications apply Limits apply 25°C.
(Continued)
LM4840 Symbol THD+N PSRR Xtalk Parameter Total Harmonic Distortion+Noise Power Supply Rejection Ratio Signal Noise Ratio Channel Separation Conditions VOUT 1VRMS, f=1kHz, 10k, =120 VRIPPLE mVrms POUT Filter
Typical (Note 0.065
Limit (Note
Units (Limits)
A-Wtd
f=1kHz,
Electrical Characteristics Bridged Mode Operation
(Notes following specifications apply unless otherwise noted. Limits apply 25°C. LM4840 Symbol Parameter Output Offset Voltage Output Power Conditions Load 1.0%; f=1kHz; (Note 1.0%; f=1kHz; (Note 1.5% (max);f kHz; THD+N 10%;f kHz; THD+N Total Harmonic Distortion+Noise kHz, PSRR Xtalk Power Supply Rejection Ratio Signal Noise Ratio Channel Separation VRIPPLE mVrms; POUT 1.1W, A-Wtd Filter f=1kHz,
Typical (Note
Limit (Note
Units (Limits) (max)
(min)
Note given MXA28A package whose exposed-DAP soldered exposed
piece ounce printed circuit board copper.
Note given MXA28A package whose exposed-DAP soldered 2in2 piece ounce printed circuit board copper bottom side layer through 8mil vias. Note given MXA28A package whose exposed-DAP soldered exposed piece ounce printed circuit board copper. Note given MXA28A package whose exposed-DAP soldered copper. Note voltages measured with respect ground pins, unless otherwise specified. specifications tested using typical application shown Figure Note When driving loads from supply LM4840LQ LM4840MH must mounted circuit board forced-air cooled. Note When driving loads from supply LM4840LQ LM4840MH must mounted circuit board. Note Absolute Maximum Ratings indicate limits beyond which damage device occur. Operating Ratings indicate conditions which device functional, guarantee specific performance limits. Electrical Characteristics state electrical specifications under particular test conditions which guarantee specific performance limits. This assumes that device within Operating Ratings. Marshall Chiu feels there better ways obtain 'More Wattage Cottage.' Specifications guaranteed parameters where limit given, however, typical value good indication device performance. Note maximum power dissipation must derated elevated temperatures dictated TJMAX, ambient temperature maximum allowable power dissipation PDMAX (TJMAX )/JA. LM4840LQ LM4840MT, TJMAX 150°C, typical junction-to-ambient thermal resistance, when board mounted, 80°C/W MTC28 package 42°C/W LM4840LQ package. Note Human body model, discharged through resistor. Note Machine Model, pF-240 discharged through pins. Note Typicals specified 25°C represent parametric norm. Note Datasheet min/max specification limits guaranteed design, test, statistical analysis. Note Number given LQA028A package whose exposed-DAP soldered exposed 2.5in2 piece ounce copper.
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LM4840
Specific Characteristics
LM4840MH, LM4840LQ THD+N Output Power LM4840MH, LM4840LQ THD+N Frequency LM4840MH, LM4840LQ THD+N Output Power
DS200104-70
DS200104-71
DS200104-72
LM4840MH, LM4840LQ THD+N Frequency
LM4840MH, LM4840LQ Power Dissipation Output Power
LM4840MH(Note Power Derating Curve
DS200104-73
DS200104-65
DS200104-64
Note These curves show thermal dissipation ability LM4840MH different ambient temperatures given these conditions: 500LFPM 2in2: part soldered 2in2, copper plane with linear feet minute forced-air flow across 2in2on bottom: part soldered 2in2, 1oz. copper plane that bottom side board through vias. 2in2: part soldered 2in2, 1oz. copper plane. 1in2: part soldered 1in2, 1oz. copper plane. Attached: part soldered down forced-air cooled.
Typical Performance Characteristics
THD+N Frequency THD+N Frequency THD+N Frequency
DS200104-57
DS200104-58
DS200104-14
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LM4840
Typical Performance Characteristics
THD+N Frequency
(Continued) THD+N Frequency
THD+N Frequency
DS200104-15
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DS200104-17
THD+N Frequency
THD+N Frequency
THD+N Frequency
DS200104-18
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DS200104-20
THD+N Frequency
THD+N Frequency
THD+N Output Power
DS200104-21
DS200104-22
DS200104-24
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LM4840
Typical Performance Characteristics
THD+N Output Power
(Continued) THD+N Output Power
THD+N Output Power
DS200104-25
DS200104-26
DS200104-27
THD+N Output Power
THD+N Output Power
THD+N Output Power
DS200104-28
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DS200104-30
THD+N Output Power
THD+N Output Power
THD+N Output Power
DS200104-31
DS200104-32
DS200104-33
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LM4840
Typical Performance Characteristics
THD+N Output Power Output Power Load Resistance
(Continued)
Output Power Load Resistance
DS200104-6 DS200104-34 DS200104-62
Output Power Load Resistance
Power Supply Rejection Ratio
Dropout Voltage
DS200104-7 DS200104-38 DS200104-53
Output Power Load Resistance
Noise Floor
Noise Floor
DS200104-8 DS200104-41 DS200104-42
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LM4840
Typical Performance Characteristics
Power Dissipation Output Power
(Continued)
Power Dissipation Output Power
Power Derating Curve
DS200104-63 DS200104-51 DS200104-52
Crosstalk
Crosstalk
Output Power Supply voltage
DS200104-49
DS200104-50 DS200104-54
Output Power Supply Voltage
DS200104-56
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LM4840
Application Information
DIGITAL VOLUME CONTROL LM4840 features digital volume control which consists CLOCK, DOWN pins. external clock CLOCK pin, connecting capacitor from CLOCK ground, internal clock used. internal clock frequency with respect this capacitor value determined from following formula: fCLK (7.338 10-7 When using external clock, clock buffered internal clock frequency that external clock divided Also, maximum frequency should kept below 100kHz. Volume changes then effected toggling either DOWN pins with logic high. After period clock pulses with either DOWN pins held high, volume will change next specified step, either down. Volume levels each step vary specified Table either DOWN remains high after first volume transition volume will change again, this time after clock pulses. next transition occurs clock pulses, then then from then clock pulses each volume transtition. This cycle shown timing diagram shown Figure Releasing held DOWN ground time re-starts cycle. This intended provide user with volume control that pauses briefly after initial application, then slowly increases rate volume change continuously applied. both DOWN pins held high, volume change will occur. Trigger points DOWN pins minimum logic high, maximum logic low. recommended, however, toggle DOWN between best performance. When using external clock, clock pulses should minimum high maximum 0.9V when using supply. Again, pulsing external clock from ensures reliable performance. Following these guidelines volume then changed with microcontroller manually using switches. MEMORY FUNCTION LM4840 features volume memory that saves last volume setting when power turned off. This requires that auxiliary power source connected VAUX through diode shown Figure Connecting circuit shown also provides that power VAUX being drawn from when greater than VAUX. VAUX must voltage 2.3V greater maintain volume memory when absent. This feature intended such applications laptop computers, where system power VAUX connected real time clock battery. default volume setting LM4840 -10dB mode, -16dB single-ended mode. This default setting only achieved power when both VAUX both been turned off, circuit sufficient time discharge 500ms depending capacitor value VAUX). ELIMINATING OUTPUT COUPLING CAPACITORS Typical single-supply audio amplifiers that switch between driving bridge-tied-load (BTL) speakers single-ended (SE) headphones coupling capacitor each output. This capacitor blocks half-supply voltage which output amplifiers typically biased
couples audio signal headphones. signal return circuit ground through headphone jack's sleeve. LM4840 eliminates these coupling capacitors. Amp2A internally configured apply VDD/2 stereo headphone jack's sleeve. This voltage matches quiescent voltage present Amp1A Amp1B outputs that drive headphones. headphones operate manner very similar bridge-tied-load (BTL). same voltage applied both headphone speaker terminals. This results current flow through speaker. current flows through headphone speaker audio signal's output amplitude increases speaker's terminal. When operating headphone amplifier, headphone jack sleeve connected circuit ground. Using headphone output jack line-level output will place LM4840's one-half supply voltage plug's sleeve connection. Driving portable notebook computer audio-visual display equipment possible. This presents difficulty when external equipment uses capacitively coupled inputs. very small minority equipment that DC-coupled, LM4840 monitors current supplied amplifier that drives headphone jack's sleeve. this current exceeds 500mAPK, amplifier shutdown, protecting LM4840 external equipment. more information, section titled 'Single-Ended Output Power Performance Measurement Considerations'. EXPOSED-DAP MOUNTING CONSIDERATIONS LM4840's exposed-DAP (die attach paddle) packages (MH, provide thermal resistance between which part mounted soldered. This allows rapid heat transfer from surrounding copper traces, ground plane and, finally, surrounding air. result voltage audio power amplifier that produces with load. This high power achieved through careful consideration necessary thermal design. Failing optimize thermal design compromise LM4840's high power performance activate unwanted, though necessary, thermal shutdown protection. packages must have their exposed DAPs soldered grounded copper PCB. DAP's copper connected large plane continuous unbroken copper. This plane forms thermal mass heat sink radiation area. Place heat sink area either outside plane case two-sided PCB, inner layer board with more than layers. Connect copper inner layer backside copper heat sink area with 32(4x8) 6(3x2) (LQ) vias. diameter should 0.012in-0.013in with 1.27mm pitch. Ensure efficient thermal conductivity plating-through solderfilling vias. Best thermal performance achieved with largest practical copper heat sink area. heatsink amplifier share same layer, nominal 2.5in2 (min) area necessary operation with load. Heatsink areas placed same layer should 5in2 (min) same supply voltage load resistance. last area recommendations apply 25°C ambient temperature. Increase area compensate ambient temperatures above 25°C. systems using cooling fans, LM4840MH take advantage forced cooling. With flow rate linear-feet minute 2.5in2 exposed copper 5.0in2 inner layer copper plane heatsink, LM4840MH continuously drive load full power. LM4840LQ achieves same output power
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LM4840
Application Information
(Continued)
level without forced cooling. circumstances conditions, junction temperature must held below 150°C prevent activating LM4840's thermal shutdown protection. LM4840's power derating curve Typical Performance Characteristics shows maximum power dissipation versus temperature. Further detailed specific information concerning layout, fabrication, mounting (LLP) package available National Semiconductor's AN1187. POWER DISSIPATION Power dissipation major concern when using power amplifier must thoroughly understood ensure successful design. Equation states maximum power dissipation point single-ended amplifier operating given supply voltage driving specified load. PDMAX (VDD)2/(2 2RL) However, direct consequence increased power delivered load bridged amplifier increase internal power dissipation. Equation states maximum power dissipation point bridged amplifier operating given supply voltage driving specified load. PDMAX 4(VDD)2/(2 2RL) Since theLM4840 stereo power amplifier, maximum internal power dissipation times that Equation Equation depending mode operation. Even with power dissipation stereo amplifiers, LM4840 does require heatsinking. power dissipation from amplifiers, must greater than package power dissipation that results from Equation PDMAX (TJMAX TA)/ LM4840 TSSOP package, 80°C/W TJMAX 150°C. Depending ambient temperature, system surroundings, Equation used find maximum internal power dissipation supported packaging. result Equation greater than that Equation then either supply voltage must decreased, load impedance increased, ambient temperature reduced. typical application power supply, with bridged loads, maximum ambient temperature possible without violating maximum junction temperature approximately 48°C provided that device operation around maximum power dissipation points. Power dissipation function output power thus, typical operation around maximum power dissipation point, ambient temperature increased. Refer Typical Performance Characteristics curves power dissipation information different output powers. LAYOUT stated Grounding section, placement ground return lines imperative maintaining highest level system performance. only important route correct ground return lines together, also aware where ground return lines routed with respect each other. output load ground returns should physically located possible from signal level lines their ground return lines. Layout Considerations With impedance loads, output power loads heavily dependent trace resistance from output pins LM4840. Traces from output LM4840MH
load load connectors should wide practical. resistance output traces will reduce power delivered load. example, with load trace resistance each output, output power load drops from 1.8W. Output power also dependent supply regulation. keep supply voltage from sagging under full output conditions, supply traces should wide practical. Grounding order achieve best possible performance, there certain grounding techniques followed. input reference grounds should tied with their respective source grounds brought back power supply ground separately from output load ground returns. Bringing ground returns output loads back supply separately will keep large signal currents from interfering with stable input ground references. exposed-DAP LM4840MH package must tied ground. POWER SUPPLY BYPASSING with power amplifier, proper supply bypassing critical noise performance high power supply rejection. capacitor location both bypass power supply pins should close device possible. effect larger half supply bypass capacitor improved PSRR increased half-supply stability. Typical applications employ volt regulator with bypass capacitors which supply stability, eliminate need bypassing supply nodes LM4840. selection bypass capacitors, especially thus dependant upon desired PSRR requirements, click performance explained section, Proper Selection External Components, system cost, size constraints. also recommended decouple each pins with 0.1µF capacitor ground. PROPER SELECTION EXTERNAL COMPONENTS Proper selection external components applications using integrated power amplifiers critical optimize device system performance. While LM4840 tolerant external component combinations, consideration component values must used maximize overall system quality. LM4840's bridged amplifier should used gain configurations minimize THD+N values, maximize signal noise ratio. gain configurations require large input signals obtain given output power. Input signals equal greater than 1Vrms available from sources such audio codecs. Besides gain, major considerations closedloop bandwidth amplifier. large extent, bandwidth dictated choice external components. Both input coupling capacitor, output coupling capacitor form first order high pass filters which limit frequency response given Equations 1/(2RiCi) 1/(2RLCO) These values should chosen based required frequency response. Selection Input Output Capacitor Size Large input output capacitors both expensive space hungry portable designs. Clearly, certain sized capacitor needed couple frequencies without
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LM4840
Application Information
(Continued)
severe attenuation. many cases speakers used portable systems, whether internal external, have little ability reproduce signals below Hz-150 this case, usinga large input output capacitor increase system performance. addition system cost size, click performance effected size input coupling capacitor, larger input coupling capacitor requires more charge reach quiescent voltage (nominally VDD.) This charge comes from output through feedback create pops once device enabled. minimizing capacitor size based necessary frequency response, turn-on pops minimized. CLICK CIRCUITRY LM4840 contains circuitry minimize turn-on transients "click pops". this case, turn-on refers either power supply turn-on device coming shutdown mode. When device turning amplifiers internally muted. internal current source ramps voltage bypass pin. Both inputs outputs ideally track voltage bypass pin. device will remain mute mode until bypass reached half supply voltage, VDD. soon bypass node stable, device will become fully operational. Although bypass current source cannot modified, size bypass capacitor, changed alter device turn-on time amount "click pop". increasing amount turn-on reduced. However, trade-off using larger bypass capacitor increase turn-on time device. Reducing will decrease turn-on time increase "click pop". There linear relationship between size turn-on time. Here some typical turn-on times different values 0.01 0.22 0.47 1sec
outputs configured adjusting feedback input resistors input op-amp. input op-amp inverting configuration where gain Note that adjusting gain input op-amp overall gain output amplifiers also affected. Although single ended outputs output amplifiers used drive line level outputs, recommended Pins achieve better performance. BEEP DETECT FUNCTION Beep Detect (Beep mono input that detects presence beep signal. When signal greater than 2.5VP-P VDD) present Beep Beep Detect circuitry will enable bridged amplifiers. Beep signals less than 2.5VP-P VDD) will trigger Beep Detect circuitry. When triggered, Beep Detect circuitry will enable bridged amplifiers regardless state mute, mode, sense pins. shown Fig. 200k resistor placed series with input capacitor. This 200k resistor changed vary amplitude beep signal. Higher values resistor will reduce amplifier gain attenuate beep signal. These resistors required order beep signal pass output. Beep Detect will pass beep signal output. cases where system beeps required when system suspended mode, LM4840 must brought shutdown before beep signal input. SHUTDOWN FUNCTION order reduce power consumption while use, LM4840 contains shutdown externally turn bias circuitry. LM4840 will shutdown when logic high placed shutdown pin. trigger point between logic logic high level typically half supply. best switch between ground supply provide maximum device performance. switching shutdown VDD, LM4840 supply current draw will minimized. While device will disabled with shutdown voltages less than VDD, idle current greater than typical value µA.The shutdown should floated, since this result unwanted shutdown condition. many applications, microcontroller microprocessor output used control shutdown circuitry which provides quick, smooth transition into shutdown. Another solution single-pole, single-throw switch conjuction with external pull-up resistor. When switch closed,the shutdown connected ground enables amplifier. switch open, then external pull-up resistor will shutdown LM4840. This scheme prevents shutdown from floating. HP-IN FUNCTION internal pull-up circuit connected HP-Sense headphone amplifier control pin. When this left unconnected, applied HP-Sense. This turns Amp2B switches Amp2A's input signal from audio signal VDD/2 voltage present Bypass. result muted bridge-connected loads. Quiescent current consumption reduced when this single-ended mode.
order eliminate "click pop", capacitors must discharged before turn-on. Rapid on/off switching device shutdown function cause "click pop" circuitry operate fully, resulting increased "click pop" noise. DOCKING STATION application such notebook computer, docking station line level outputs required. drive loads greater than rail rail. These pins tied output input op-amp drive powered speakers other high impedance loads. Output coupling capacitors need placed series with load. recommended values capacitors between 0.33µF 1.0µF with positive side capacitors toward outputs docking station pins cannot attenuated with volume control. However gain
Figure shows implementation LM4840's headphone control function. internal comparator with nominal 400mV offset monitors signal present -OUTB output. compares this signal against signal applied HP-Sense pin. When these signals equal,
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LM4840
Application Information
(Continued)
case when connected amplifier, comparator forces LM4840 maintain bridged-amplifier operation. When HP-Sense externally floated, such when headphones connected jack shown Figure internal pull-up forces internal comparator's HP-Sense inputs. This changes comparator's output state enables headphone function: turns Amp2B, switches Amp2A's input signal from audio signal VDD/2 voltage present mutes bridge-connected loads. Amp1A Amp1B drive headphones.
three-wire plug. plug's ring should each carry stereo output signals, whereas sleeve provides return Amp2A. headphone jack with control contact sufficient drive HP-Sense when connecting headphones. switch replace headphone jack contact pin. When switch shorts HP-Sense VDD, bridge-connected speakers muted Amp1A Amp2A drive pair headphones. When switch shorts HP-Sense GND, LM4840 operates bridge mode. headphone drive needed, short HP-Sense -OUTB pin.
Figure also shows suggested headphone jack electrical connections. jack designed mate with
DS200104-74
FIGURE ESDAxxxL provides additional protection beyond 8000V shown Absolute Maximum Ratings AMP2A output
DS200104-75
FIGURE Volume Control Timing Diagram
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LM4840
Application Information
BEEP DETECT MUTE
(Continued)
Table Logic Level Truth Table
SENSE MODE BTLSPK (buffer) (buffer) (buffer) (buffer) *Dual Mode *Dual Mode *Amps muted *Amps muted
*Next four conditions, beep detected; beep signal added audio signal bypasses volume control (unity)
*Next eight conditions turns amps
*Beepdetect signal overrides mute. example, muted bpdetect HIGH, then longer muted. **Dual mode: When jack inserted, load (speaker corresponding outputs physically disconnected. Load remains connected; however, differentially there voltage across beep detected (i.e. beepdetect HIGH), then summed signal (audio beep signals) heard headphones speaker
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LM4840
Application Information
(Continued)
Table LM4840 Volume Control Steps
Volume Step (dB) 6.00 5.00 4.00 3.00 2.00 1.00 0.00 -2.00 -4.00 -6.00 -8.00 -10.00 -12.00 -14.00 -16.00 -18.00 -20.00 -21.90 -24.00 -26.10 -28.10 -29.90 -32.70 -36.00 -38.80 -41.30 -44.90 -50.90 -56.90 -62.90 -70.90 -70.90 (dB) 0.00 -1.00 -2.00 -3.00 -4.00 -5.00 -6.00 -8.00 -10.00 -12.00 -14.00 -16.00 -18.00 -20.00 -22.00 -24.00 -26.00 -27.90 -30.00 -32.10 -34.10 -35.90 -38.70 -42.00 -44.80 -47.30 -50.90 -56.90 -62.90 -68.90 -76.90 -76.90
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LM4840
Physical Dimensions
inches (millimeters) unless otherwise noted
Package Order Number LM4840LQ Package Number LQA028A Exposed-DAP
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LM4840
Physical Dimensions
inches (millimeters) unless otherwise noted (Continued)
TSSOP Package Order Number LM4840MT Package Number MTC28 TSSOP
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LM4840
Physical Dimensions
inches (millimeters) unless otherwise noted (Continued)
Exposed-DAP TSSOP Package Order Number LM4840MH Package Number MXA28A Exposed-DAP TSSOP
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LM4840 Stereo Audio Power Amplifiers with Digital Volume Control Input
Notes
LIFE SUPPORT POLICY NATIONAL'S PRODUCTS AUTHORIZED CRITICAL COMPONENTS LIFE SUPPORT DEVICES SYSTEMS WITHOUT EXPRESS WRITTEN APPROVAL PRESIDENT GENERAL COUNSEL NATIONAL SEMICONDUCTOR CORPORATION. used herein: Life support devices systems devices systems which, intended surgical implant into body, support sustain life, whose failure perform when properly used accordance with instructions provided labeling, reasonably expected result significant injury user.
National Semiconductor Corporation Americas Email: support@nsc.com National Semiconductor Europe Fax: 180-530 Email: europe.support@nsc.com Deutsch Tel: 9508 6208 English Tel: 2171 Tel: 8790
critical component component life support device system whose failure perform reasonably expected cause failure life support device system, affect safety effectiveness.
National Semiconductor Asia Pacific Customer Response Group Tel: 65-2544466 Fax: 65-2504466 Email: ap.support@nsc.com
National Semiconductor Japan Ltd. Tel: 81-3-5639-7560 Fax: 81-3-5639-7507
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National does assume responsibility circuitry described, circuit patent licenses implied National reserves right time without notice change said circuitry specifications.

LM4840

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