LM4832

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LM4832 Digitally Controlled Tone Volume Circuit with Stereo Audio Power Amplifier, Microphone Preamp Stage National Sound
LM4832 Digitally Controlled Tone Volume Circuit with Stereo Audio Power Amplifier, Microphone Preamp Stage National Sound
LM4832 monolithic integrated circuit that provides volume tone (bass treble) controls well stereo audio power amplifier capable producing (typ) into (typ) into with less than 1.0% THD. addition, input microphone preamp stage, with volume control, capable driving load implemented chip. LM4832 also features National's Sound circuitry which externally adjusted simple network. maximum system flexibility, LM4832 externally controlled, low-power consumption shutdown mode, independent mute power microphone amplifiers Boomer audio integrated circuits were designed specifically provide high quality audio while requiring external components. Since LM4832 incorporates tone volume controls, stereo audio power amplifier microphone preamp stage, optimally suited multimedia monitors desktop computer applications.
Specifications
Output Power into Output Power into THD+N 75mW into 1kHz Microphone Input Referred Noise Supply Current Shutdown Current 350mW (typ) 100mW (typ) 0.5% (max) (typ) 13mA (typ) (typ)
Features
Independent Left Right Output Volume Controls Treble Bass Control National Sound Compatible Interface Microphone Inputs with Selector Software Controlled Shutdown Function
Applications
Multimedia Monitors Portable Desktop Computers
Block Diagram
Connection Diagram
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FIGURE LM4832 Block Diagram
View Order Number LM4832N, LM4832M Package Number N28B Package Number M28B SOIC
Boomer registered trademark National Semiconductor Corporation.
2000 National Semiconductor Corporation
DS100014
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LM4832
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 (Note Susceptibility (Note Susceptibility (Note Junction Temperature Soldering Information Small Outline Package Vapor Phase sec.) 6.0V -65°C +150°C -0.3V +0.3V Internally limited 2000V 250V 150°C
Infrared sec.)
220°C
AN-450 Surface Mounting their Effects Product Reliability other methods soldering surface mount devices. (typ) N28B (typ) N28B (typ) M28B (typ) M28B 21°C/W 62°C/W 15°C/W 69°C/W
Operating Ratings
Temperature Range TMIN TMAX Supply Voltage -40°C 85°C 5.5V
215°C
Electrical Characteristics Entire IC(Notes following specifications apply unless otherwise noted. Limits apply 25°C.
LM4832 Symbol AUDIO PATH Output Offset Voltage (max) Parameter Supply Voltage Quiescent Power Supply Current Shutdown Current Attenuator Range Step Size Gain Step Size Error Channel Channel Tracking Error Bass Control Range Bass Step Size Bass Step Size Error Bass Tracking Error Treble Control Range Treble Step Size Treble Step Size Error Treble Tracking Error Attenuator Range Step Size Step Size Error Channel Channel Tracking Error Gain Setting Attenuation Setting kHz, 0.25V 0.25V BASS CONTROL Attenuation Setting Attenuation Setting 0.15 Conditions Typical (Note Limit (Note Units (Limits) (min) (max) (max) (max) (max) (min) (max) (max) 0.15 (min) (max) (max) (max) 0.15 (min) (max) (max) (max) (max) (min) (max) (max)
INPUT ATTENUATORS
TREBLE CONTROL
OUTPUT ATTENUATORS
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LM4832
Electrical Characteristics Entire IC(Notes
(Continued)
following specifications apply unless otherwise noted. Limits apply 25°C. LM4832 Symbol AUDIO PATH Output Power 1.0% (max), kHz, controls THD+N Total Harmonic Distortion+Noise Controls 10%, Vrms, PSRR XTALK Power Supply Rejection Ratio Mute Attenuation Cross Talk VRIPPLE mVrms, Controls Setting kHz, controls setting, Left Right Right Left MICROPHONE PREAMP VOLUME CONTROL Preamp Gain Gain Gain Gain VSWING PSRR XTALK THD+N Attenuator Range Step Size Step Size Error Output Voltage Swing Input Referred Noise Power Supply Rejection Ratio Mute Attenuation Cross Talk Total Harmonic Distortion Plus Noise Power controls kHz, Setting Gain Gain TIMING fMAX TSTART:HOLD TD;SETUP TC;HIGH TC;LOW TSTOP;SETUP Maximum Frequency Start Signal: Hold Time before Clock/Data Transitions Data Setup Time Minimum High Clock Duration Minimum Clock Duration Stop Signal: Setup Time before Clock/Data Transitions Input Voltage 0.03 0.03 0.04 kHz, 1.0%, A-Weighted, Attenuator VRIPPLE mVrms, Gain Setting Attenuation Setting (max) (min) (max) Vrms (min) (min) (min) Parameter Conditions Typical (Note Limit (Note Units (Limits)
0.15 0.11 0.08
INPUT OUTPUT (max)
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LM4832
Electrical Characteristics Entire IC(Notes
(Continued)
following specifications apply unless otherwise noted. Limits apply 25°C. LM4832 Symbol Parameter Conditions Typical (Note Limit (Note 0.15 Units (Limits)
INPUT OUTPUT Input High Voltage Input Current Output Voltage Acknowledge External Power Disable External Power Disable High (min) (max) (max) (min)
Note voltages measured with respect ground pins, unless otherwise specified. specifications tested using typical applicationas shown Figure 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. 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 TA)/JA.For LM4832, TJMAX 150°C, typical junction-to-ambient thermal resistance, when board mounted, 69°C/W assuming M28B package. Note Human body model, discharged through resistor. Note Machine Model, pF-240 discharged through pins. Note Typicals measured 25°C represent parametric norm. Note Limits guaranteed that parts tested production meet stated values.
Typical Application Circuit
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FIGURE Typical Application Circuit
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LM4832
Description
LEFT RIGHT (28) external network connected across these pins. This function provides left-right channel cross coupling cancellation create enhanced stereo channel separation effect. capacitor placed between this ground provide ground internal half-supply voltage reference. capacitor this affects "click-pop" performance. Turn-on turn-off times also determined this capacitor. Refer Application Information section more information. These outputs intended drive speakers headphones. These outputs should AC-coupled loads. Refer Application Information section more information. This provides high current return power output stage MOSFETs digital circuitry. These pins allow external signal processor access stereo signal. Please Application Information section more information. These pins connected tone control outputs drive power amplifier inputs. Refer Application Information section more information. These pins connected inputs tone control amps. capacitor between Tone Tone pins sets frequency response tone functions. Please refer Application Information section more information. These pins stereo inputs LM4832. These pins should AC-coupled input signals. This analog ground line level signal inputs. These pins independent selectable microphone inputs. These pins should AC-coupled. This output microphone amplifier should AC-coupled load. These pins supply. These pins should separately bypassed higher, film capacitors. supply should bypassed higher, tantalum aluminum electrolytic capacitor. These pins used determine address LM4832.
CLOCK (17) DATA (18) GENERAL PURPOSE OUTPUT (19) RESET (27)
This input clock signal. This input data signal. This provides general purpose TTL/CMOS output. Please refer Application Information section more information. This TTL/CMOS input which used reset chip logic states.
BYPASS
POWER LEFT RIGHT (26) POWER LOOP LOOP TONE
TONE
INPUTS ANALOG (10) INPUTS (11, (14) (13,
ADDRESS BITS (15,
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LM4832
Typical Performance Characteristics
THD+N Frequency, THD+N Frequency, THD+N Frequency,
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THD+N Output Power
THD+N Output Power
THD+N Output Power
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Power Amplifier Crosstalk
Power Amplifier Noise Floor
Power Amplifier Attenuation Frequency
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LM4832
Typical Performance Characteristics
Power Supply Rejection Ratio
(Continued)
Power Dissipation Output Power
Power Derating Curve
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Amplifer Crosstalk from Power Amplifier
Amplifier Noise Floor
Amplifier Attenuation Frequency
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Amplifier Gain Frequency
Amplifier THD+N Frequency
Loop-out THD+N Frequency
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LM4832
Typical Performance Characteristics
Bass Response Frequency Treble Response Frequency
(Continued)
Bass Treble Response Frequency
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Supply Current Temperature
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Timing Diagram
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FIGURE Format
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LM4832
Timing Diagram
(Continued)
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Electrical Characteristics section fortiming specifications
FIGURE Timing Diagram
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LM4832
Truth Tables
SOFTWARE SPECIFICATION
Chip Address
*E.C. *E.C.
*E.C. Externally Configuarable
Data Bytes (Brief Description)
Function Input Volume Control Bass Control Treble Control Right Output Vol./Mute Left Output Vol./Mute Input Gain Microphone Volume General Control
Input Volume Control
Attenuation (dB) Input Volume Control Attenuation
Input Volume Control Power State
Bass Control
Level (dB) Bass Control Flat
Bass Control Power State
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LM4832
Truth Tables
(Continued)
Treble Control
Level (dB) Treble Control Flat
Treble Control Power State
Left Volume Control
Function Left Channel Mute Left Channel Muted
Left Volume Control Power State
General Control
Function Chip Chip Shutdown G.P.O. Output G.P.O. Output High Stereo Enhance Stereo Enhance Stereo Operation Mono Force External Loop Disable External Loop Enable
General Control Power State
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LM4832
Truth Tables
(Continued)
Right Volume Control
Level (dB) Right Channel Mute Right Channel Muted
Right Volume Control Power State
Microphone Input Selection Gain
Function Input Input Input Gain Gain (+20 Gain (+30 selected with gain
Input Sel. Gain Power State
Microphone Volume Control
Function Microphone Muted Microphone Muted
Volume Control Power State
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LM4832
Application Information
GROUNDING order achieve best possible performance, certain grounding techniques should followed. input reference grounds should tied with their respective source grounds brought back power supply ground separately from output load ground returns. These input grounds should also tied with half-supply bypass ground. Bringing ground returns output loads back supply separately will keep large signal currents from interfering with stable input ground references. LAYOUT stated Grounding section, placement ground return lines critical maintaining highest level system performance. only important route correct ground return lines together, also important aware where those ground return lines routed conjunction with each other. output load ground returns should physically located reasonably possible from signal level lines their ground return lines. Critical signal lines those relating microphone amplifier section, since these lines generally work very signal levels. SUPPLY BYPASSING with amps power amps, LM4832 requires supplies bypassed avoid oscillation. avoid high frequency instabilities, metallized-film ceramic capacitor should used bypass supplies close chip possible. frequency considerations, greater tantalum electrolytic capacitor should paralleled with high frequency bypass capacitor. power supply bypass capacitors sufficiently large, current power supply leads, which rectified version output current, back into internal circuitry. This internal feedback signal cause high frequency distortion oscillation. power supply lines chip long, larger bypass capacitors could required. Long power supply leads have inductance resistance associated with them, that could prevent peak frequency current demands from being met. extra bypass capacitance will reduce peak current requirements from power supply lines. POWER-UP STATUS power-up after hard reset, LM4832 registers will initialized with default values listed truth tables. default, LM4832 power microphone outputs muted, tone controls flat, National Enhance off, chip stereo mode, microphone input selected with gain. CLICK CIRCUITRY LM4832 contains circuitry minimize turn-on transients "click pops". this case, turn-on refers either power supply turn-on device coming shutdown mode. When deviceis turning amplifiers internally configured unity gain buffers. internal current source charges bypass capacitor bypass pin. Both inputs outputs ideally track voltage bypass pin. device will remain buffer 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". small, LM4832 develop low-frequency oscillation ("motorboat") when used high gains. There linear relationship between size turn-on time. Some typical turn-on times different values are: 0.01 0.22
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. output coupling cap, particular concern. This capacitor discharges through internal resistor. Depending size time constant quite large. reduce transients, external resistor placed parallel with internal resistor. tradeoff using this resistor increase quiescent current. COUPLING CAPACITORS Because LM4832 single supply circuit, audio signals must capacitor coupled chip remove bias. audio inputs have input impedances, AC-coupling capacitor will create high-pass filter with f-3dB 1/(2*20 k*CIN). amplifier outputs also need AC-coupled loads.The high-pass filter comprised output load coupling capacitor,where filter cutoff f-3dB 1/(2*RLOAD*COUT). POWER AMPLIFIER power amplifiers LM4832 designed drive loads (continuous) (continuous), respectively, with THD+N. shown Typical Performance Characteristics, power amplifiers typically drive loads with slight increase high-frequency THD. discussed above, these outputs should AC-coupled output load. MICROPHONE AMPLIFIER microphone preamplifier intended amplify low-level signals signal conditioning. microphone inputs directly connected microphone networks. microphone amplifier enough output capability drive load. microphone inputs outputs must ACcoupled.
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LM4832
Application Information
INTERFACE
(Continued)
LM4832 uses serial bus, which conforms protocol, control chip's functions with wires: clock data. clock line uni-directional. data line bidirectional(open-collector) with pullup resistor (typically k).The maximum clock frequency specified standard kHz. this discussion, master controlling microcontroller slave LM4832. address LM4832 determined using Address Address TTL/CMOS inputs chip. LM4832's four possible chip addresses form 10000X2X10 (binary), where X1bits determined voltage levels Address Address pins, respectively. interface used address number chips system LM4832's chip address changed avoid address conflicts. timing diagram shown Figure data latched stable high level clock data line should held high when use. timing diagram broken into major sections: "start" signal generated lowering data signal while clock signal high. start signal will alert devices attached check incoming address against their chip address. 8-bit chip address sent next, most significant first. Each address must stable while clock level high. After last address sent, master checks LM4832's acknowledge. master releases data line high (through pullup resistor). Then master sends clock pulse. LM4832 received address correctly, then holds data line during clock pulse. data line low, then master should send "stop" signal (discussed later) abort transfer. bits data sent next, most significant first. Each data should valid while clock level stable high. After data byte sent, master must generate another acknowledge LM4832 received data. master more data bytes send LM4832, then master repeat previous steps until data bytes have been sent. "stop" signal ends transfer. signal "stop", data signal goes high while clock signal high. AUDIO ENHANCEMENT LM4832 audio enhancement effect that helps improve apparent stereo channel separation when, because cabinet equipment limitations, left right speakers closer each other than optimal.
external network, shown Figure required enable effect. amount effect resistor. capacitor used reduce effect frequencies below Decreasing resistor size will make effect more pronounced decreasing capacitor size will raise cutoff frequency effect. resistor across capacitor reduces switching noise discharging capacitor when effect use.
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FIGURE Effect Components TONE CONTROL RESPONSE Bass treble tone controls included LM4832. tone controls external capacitors each stereo channel. Each corner frequency determined value (see Figure internal resistors feedback loop internal tone amplifier. Typically, corner frequencies, 0.0082 Altering ratio between changes midrange gain. example, 2(C3), then frequency response will flat kHz, will have peak kHz. With treble turn-over frequency nominally 1/(2C(14 bass turn-over frequency nominally 1/(2C(30.4 k)), when maximum boost chosen. inflection points (the frequencies where boost within final value) are, treble bass respectively, 1/(2C(1.9 1/(2C(169.6 Increasing values decreases turnover inflection frequencies: i.e., Tone Control Response Curves shown Typical Performance Section will shift left when increased shift right when decreased. With 0.0082 steps achieved kHz. Changing 0.01 shifts step frequency kHz.If tone control capacitors' size decreased these frequencies will increase.With 0.0068 steps take place 11.2 kHz.
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LM4832
Application Information
(Continued)
DS100014-29
FIGURE Tone Control Diagram GENERAL PURPOSE OUTPUT General Purpose Output intended used control signal other devices, such external power amplifier. This controlled through interface relatedto other functions within LM4832. Refer Truth Tables section proper data bits utilize this function. channel (rms) power amplifier with mute. AC-coupling capacitors must used remove bias present between LM4832 outputs external power amplifier inputs. Prior placing preamp circuitry shutdown, General Purpose Output should used disable external power amplifier.This will prevent shutdown transients preamp circuitry from being amplified external power amplifier.
Figure shows example using General Purpose Output interface with external power amp. this case, external power LM4755 stereo watt
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10W/ch System with Controlled Tone,Volume Sound LOOP IN/OUT PINS Loop Loop pins used when application requires special function performed audio signal. shown Figure audio signal taken from Loop sent external signal processor. After signal processed externally, back into Loop pin. example where this functionality would used computer speakers. external loop could used provide bass boost counteract speaker's natural baffleinduced rolloff. Since Loop goes directly input CMOS amplifier, input impedance very high. Loop driven input attenuation amplifier, which capable driving impedances
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LM4832
Application Information
(Continued)
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LM4832 SAMPLE LAYOUT LAYOUT PARTS LIST Name COUT CMOUT CTONE Type Capacitors: 1000 elec., Digikey #P6205 elec., Digikey #P5202 0.33 film, Digikey #P4669 8200 ceramic, Digikey #P4823 0.33 film, Digikey #EF1334 film, Digikey #EF1104 Resistors (all resistors: Digikey #(Value)QBK): RDATA RGND 1/4W 1/4W 1/4W 100, 1/4W 1/4W Quantity Banana Jack Black Jack Stereo Headphone Mono Miniplug Name
LAYOUT PARTS LIST Type Connectors: Mouser #164-6218 Mouser #164-6218 Mouser #16PJ097 Shogyo #JJ-0357-3RT Shogyo #JJ-0357-B Quantity
CLIN, CMIN, film, Digikey #E1105
36-pin Digikey #1036RF Centronics LAYOUT DESCRIPTION layout given following pages meant connected parallel port (printer) cable. board controlled software Windows parallel cable must standard type used hooking printer DB-25 connector andthe other Centronics connector. Banana connections provided VDD, ground, amplifier outputs. Amplifier outputs also routed stereo headphone jack. connections provided amplifier inputs, loop loop out, microphone out. Mono miniplug connectors provided microphone inputs. required, microphones biased using resistors RMIC1 RMIC2. This layout allow internal tonecontrol circuitry external loop. jumper next each CLIN capacitor controls which route signal should take.
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LM4832
Typical Application Layout (All Layers)
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LM4832
Typical Application Layout (Silkscreen Layer)
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LM4832
Typical Application Layout (Bottom Layer)
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LM4832
Typical Application Layout (Top Layer)
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LM4832
Physical Dimensions
inches (millimeters) unless otherwise noted
28-Lead SOIC Package (M28B) Order Number LM4832M Package Number M28B SOIC
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LM4832 Digitally Controlled Tone Volume Circuit with Stereo Audio Power Amplifier, Microphone Preamp Stage National Sound
Physical Dimensions
inches (millimeters) unless otherwise noted (Continued)
28-Lead Dual-In-Line Package (N28B) Order Number LM4832N Package Number N28B
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 Tel: 1-800-272-9959 Fax: 1-800-737-7018 Email: support@nsc.com www.national.com National Semiconductor Europe Fax: 180-530 Email: europe.support@nsc.com Deutsch Tel: 9508 6208 English Tel: 2171 Tel:
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 Email: nsj.crc@jksmtp.nsc.com Fax: 81-3-5639-7507
National does assume responsibility circuitry described, circuit patent licenses implied National reserves right time without notice change said circuitry specifications.

LM4832

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