Monolithic Linear LA4805V Stereo Headphone Power Amplifier

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Monolithic Linear LA4805V Stereo Headphone Power Amplifier

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Ordering number EN4469A
Monolithic Linear
LA4805V
Stereo Headphone Power Amplifier
Overview
LA4805V power developed stereo headphones. includes frequency enhancement, beep function output control circuits on-chip. Furthermore, LA4805V realizes high ratio, high ripple exclusion ratio, current drain.
Package Dimensions
unit: 3191-SSOP30
[LA4805V]
Functions
Stereo headphone power amplifier frequency enhancement (L.BOOST) Beep amplifier Output suppression circuit (PVSS) Power switch Muting switch
Features
current drain (8.3 typical) High ratio typical, High ripple exclusion ratio typical) output electrolytic capacitors required Ultra-miniature package (SSOP-30)
SANYO: SSOP30
Specifications
Maximum Ratings 25°C
Parameter Maximum supply voltage Allowable power dissipation Operating temperature Storage temperature Symbol Topr Tstg Conditions Ratings +150 Unit
Operating Conditions 25°C
Parameter Recommended supply voltage Recommended load resistance Operating supply voltage range Symbol Conditions Ratings Unit
SANYO products described contained herein have specifications that handle applications that require extremely high levels reliability, such life-support systems, aircraft's control systems, other applications whose failure reasonably expected result serious physical and/or material damage. Consult with your SANYO representative nearest before using SANYO products described contained herein such applications. SANYO assumes responsibility equipment failures that result from using products values that exceed, even momentarily, rated values (such maximum ratings, operating condition ranges, other parameters) listed products specifications SANYO products described contained herein.
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TOKYO OFFICE Tokyo Bldg., 1-10, Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
O3098HA (OT)/40794TH B8-0242 4469-1/17
LA4805V
Operating Characteristics 25°C, kHz, 0.775 dBm, (L.B), (PWR)
Ratings Parameter [L.BOOST +PVSS PWR] ICCO1 Quiescent current ICCO2 ICCO3 ICCO4 [PWR AMP] Output power Voltage gain Channel balance Total harmonic distortion Output noise voltage Crosstalk Ripple exclusion ratio Muting attenuation Beep output Output current offset Input resistance [L.BOOST] Voltage gain Boost* Maximum output voltage Total harmonic distortion Crosstalk Output noise voltage Ripple exclusion ratio [L.BOOST PWR] Voltage gain Output voltage Total harmonic distortion Crosstalk THD3 dBm, kHz, boost on/off dBm, boost dBm, boost dBm, boost dBm, PVSS2 input amplitude when output over starting point dBm, PVSS2 PVSS2 0.13 0.23 0.14 32.5 0.33 L.BTS1 L.BTS2 THD2 VNO2 SVRR2 dBm, boost on/off dBm, boost dBm, kHz, boost boost boost dBm, boost boost dBm, boost -3.2 -5.2 0.085 -7.2 0.25 THD1 VNO1 SVRR1 ATVO BEEP 0.35 AUDIO dBm, kHz, dBm, (sine wave) 15.7 17.7 19.7 Muting L.BST/PVSS L.BST/PVSS 0.05 12.0 12.5 Symbol Conditions Unit
[L.BOOST PVSS PWR]: When maximum PVSS voltage PVSS width PVSS distortion PVSS starting input Note: Boost levels relative PVSS2 PVSS PVSS PVSS -32.5 -37.5 0.55 -42.5
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LA4805V
Assignment Block Diagram
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LA4805V
Test Circuit
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LA4805V
Sample Application Circuit
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LA4805V Functions Equivalent Circuits (VCC
Symbol Equivalent circuit function Unit (resistance:
Applying turns power
boost input
High-pass input
boost buffer output
Power input input resistance
Power common input Connect Vref normal operation
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LA4805V
Continued from preceding page.
Symbol Equivalent circuit Unit (resistance: capacitance: function
VREF
Fixed bias
VREF CONT
VREF CONT pin,
AVLS operates 0.65 higher.
Beep
Beep input Only operates when muting function
CONT
R.F. CONT
2.65
bias about 0.88 times VCC.
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LA4805V
Continued from preceding page.
Symbol Equivalent circuit Unit (resistance: capacitance: function
PVSS
Smoothing used when PVSS turned off.
PVSS
PVSS turned power output signal, turned when grounded.
power output pins LA4805V drives headphones with used common center. electrolytic capacitors used output.)
BOOST
boost function turned when this floating turned when connected Vref.
operates 0.65 higher.
boost secondary pass
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LA4805V
Continued from preceding page.
Symbol Equivalent circuit function Unit (resistance:
BOOST
boost
boost primary pass
MUTE
muting function when this floating when connected through resistor.
External Component Functions: Recommended values indicated parentheses.
Input coupling capacitors (2200 Input high pass capacitors. high region gain when boost determined internal resistance these external 2200 capacitors. (0.1 Mixer amplifier power amplifier coupling capacitors (3.3 Reference bias (Vref) decoupling capacitors Determines PVSS recovery time. (0.1 Beep input coupling capacitor. sure that this capacitor does attenuate beep signal. C11, (4.7 Ripple filter capacitors. Care required selecting their value, since although increasing capacitance increases ripple exclusion ratio, also increases rise time when power turned (3.3 Smoothing capacitor PVSS on/off switching noise
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LA4805V (0.22 0.47 Coupling capacitor that accepts power output signal inputs that signal PVSS function. (220 Power supply line decoupling capacitor C16, C17, (0.22 0.47 Oscillation suppression capacitors. recommend using film capacitors. (2.2 Smoothing capacitor boost on/off switching noise (3.3 Determines boost attack time. Increasing capacitance increases attack time. C21, (0.1 pass capacitors used with boost function (2.2 boost amplifier capacitor. Values excess recommended range will slow boost amplifier's rise time cause noise spikes. (0.1 Determines muting time. Usage Notes" section discussion muting time when capacitor value varied. Mixer amplifier load resistance power input adjustment potentiometer. (100 Smoothing resistor PVSS on/off switching noise PVSS level adjustment resistor Power amplifier oscillation suppression capacitors. recommend using film capacitors. Power output signal bias resistor PVSS operation Determines bias when boost off. (1.5 Determines boost amplifier's voltage gain. (100 Determines bias when muting (and on). recommend using resistor R12, since muting switch (pin threshold area determined this (100 resistance IC's internal resistance.
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LA4805V
Usage Notes Operating Principles
Beep function operating principles
figure above shows beep function block, which designed operate when muting i.e., when open. output voltage generated that time given following equation.
example, when adjusted input level.)
While beep output determined formula above, influenced capacitor resistor used form output oscillation suppression function. Therefore, when using beep function, necessary make impedance capacitor smaller than impedance capacitors pins since common output. Which say, capacitor must larger than capacitors C10. Muting time
figure above shows waveform when muting function turned off. times here changed capacitor While recommended value note that reducing this value lead increased impulse ("pop") noise.
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LA4805V table below lists times different values
Boost level when boost function PVSS
Normally, boost level with respect when boost However, LA4805V designed that boost level with respect when both PVSS boost PVSS turned when power output input boost level determined adjusting shown dotted lines figure. (See separately provided detailed data describing state where both boost PVSS on.) graphs below give simplified view fi-VG characteristics.
PVSS
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LA4805V shown figure above, PVSS designed that PVSS operated turned inputting mixed power outputs through resistors. When this input grounded, PVSS turned off. PVSS switching changed internal resistor external (150 resistor. When this function used, passing mixed signal through resistor PVSS1, passing mixed signal through only 0.22 capacitor PVSS2. (Detailed data provided separately.) graph below gives simplified view Vi-VO characteristics output when varied.
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LA4805V
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LA4805V
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LA4805V
Specifications SANYO products described contained herein stipulate performance, characteristics, functions described products independent state, guarantees performance, characteristics, functions described products mounted customer's products equipment. verify symptoms states that cannot evaluated independent device, customer should always evaluate test devices mounted customer's products equipment. SANYO Electric Co., Ltd. strives supply high-quality high-reliability products. However, semiconductor products fail with some probability. possible that these probabilistic failures could give rise accidents events that could endanger human lives, that could give rise smoke fire, that could cause damage other property. When designing equipment, adopt safety measures that these kinds accidents events cannot occur. Such measures include limited protective circuits error prevention circuits safe design, redundant design, structural design. event that SANYO products (including technical data, services) described contained herein controlled under applicable local export control laws regulations, such products must exported without obtaining export license from authorities concerned accordance with above law. part this publication reproduced transmitted form means, electronic mechanical, including photocopying recording, information storage retrieval system, otherwise, without prior written permission SANYO Electric Co., Ltd. information described contained herein subject change without notice product/technology improvement, etc. When designing equipment, refer "Delivery Specification" SANYO product that intend use. Information (including circuit diagrams circuit parameters) herein example only; guaranteed volume production. SANYO believes information herein accurate reliable, guarantees made implied regarding infringements intellectual property rights other rights third parties.
This catalog provides information December, 1998. Specifications information herein subject change without notice. 4469-17/17

Monolithic Linear LA4805V Stereo Headphone Power Amplifier

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