Audio Circuits Using NE5532/34 following will explain some Semiconduct

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Audio Circuits Using NE5532/34 following will explain some Semiconduct

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AND8177/D Audio Circuits Using NE5532/4
Audio Circuits Using NE5532/34 following will explain some Semiconductors noise amps show their some audio applications. Description 5532 dual high-performance noise operational amplifier. Compared most standard operational amplifiers, such 1458, shows better noise performance, improved output drive capability considerably higher small-signal power bandwidths. This makes device especially suitable application high quality professional audio equipment, instrumentation control circuits, telephone channel amplifiers. internally-compensated gains equal one. very noise prime importance, recommended that 5532A version used which guaranteed noise voltage specifications. APPLICATIONS Semiconductors 5532 High-Performance ideal amplifier high quality professional audio equipment which requires noise distortion. circuit (Figure included this application note been assembled board, tested with actual audio input devices (Tuner Turntable). consists Recording Industry Association America (RIAA) preamp, input buffer, 5-band equalizer, mixer. Although circuit design new, performance using 5532 been improved. RIAA preamp section standard compensation configuration with frequency boost provided Magnetic cartridge network feedback loop. Cartridge loading accomplished chosen typical value, differ from cartridge cartridge. Equalizer section consists input buffer, active variable band pass/notch (depending R9's setting) filters, output summing amplifier. input buffer standard unity gain design providing impedance matching between preamplifier equalizer section. Because 5532 internally-compensated, external compensation required. 5-band active filter section actually five individual active filters with same feedback design five. main difference five stages values which responsible setting center frequency each stage. Linear pots recommended simplify this circuit, component value table provided, which lists center frequencies their associated capacitor values. Notice that equals value related factor well. values listed table common easily found standard values.
RIAA RIAA 5532 5532
5532
5532
FLAT
VOL./
EQUALIZE
REPEAT ABOVE CIRCUIT DESIRE STAGES.
Figure RIAA Equalizer Schematic Semiconductor Components Industries, LLC, 2005
November, 2005 Rev.
Publication Order Number: AND8177/D
AND8177/D
RIAA Equalization Audio Preamplifier Using NE5532A With onset recording techniques with sophisticated playback equipment, breed noise operational amplifiers developed complement state- -the- audio reproduction. first ultra-of- -art -low noise introduced Semiconductors called NE5534A. This single operational amplifier with less than input noise voltage. NE5534A internally-compensated gain three. This device been used many audio preamp equalizer (active filter) applications since introduction. Many amplifiers that being designed today DC-coupled. This means that very frequencies (2-15 being amplified. These frequencies common turntables because rumble tone resonances. Since amplifiers reproduce these
(dB) RIAA RIAA
sub-audible tones, they become quite objectionable because speakers reproduce these tones. This causes non-linearities when actual recorded material amplified converted sound waves. RIAA proposed change standard playback response curve order alleviate some problems that were previously discussed. changes occur primarily frequency range with slight modification high frequency range (See Figure Note that response peak bass section playback curve occurs 31.5 begins roll below that frequency. roll-off occurs introducing fourth network with 7950 time constant three existing networks that make equalization circuit. high equalization curve extended kHz, because recordings these frequencies achievable many current discs.
(Hz)
100K
Figure Proposed RIAA Playback Equalization
INPUT NE5532A
LOAD
49.9 49.9 .056 .015 NOTE: resistors metal film. 4.99
Figure RIAA Phonograph Preamplifier Using NE5532A
AND8177/D
COMPONENT VALUES FIGURE
1082 1588 2382 2904 3502 4253 5068 7218 10827 15880 23820 0.47 0.33 0.22 0.15 0.082 0.068 0.056 0.047 0.033 0.022 0.015 0.01 0.0082 0.0068 0.0056 0.0047 0.0033 0.0022 0.0015 0.001 0.047 0.033 0.022 0.015 0.01 0.0082 0.0068 0.0056 0.0047 0.0033 0.0022 0.0015 0.001 1191 1452 1751 2126 2534 3609 5413 7940 11910 14524 17514 21267 0.47 0.33 0.22 0.15 0.082 0.068 0.056 0.047 0.033 0.022 0.015 0.01 0.0082 0.0068 0.0056 0.0047 0.0033 0.0022 0.0015 0.001 0.047 0.033 0.022 0.015 0.01 0.0082 0.0068 0.0056 0.0047 0.0033 0.0022 0.0015 0.001 1063 1267 1804 2706 3970 5955 7262 8757 10633 12670 18045 0.47 0.33 0.22 0.15 0.082 0.068 0.056 0.047 0.033 0.022 0.015 0.01 0.0082 0.0068 0.0056 0.0047 0.0033 0.0022 0.0015 0.001 0.047 0.033 0.022 0.015 0.01 0.0082 0.0068 0.0056 0.0047 0.0033 0.0022 0.0015 0.001
AND8177/D
NE5534 Description 5534 single high-performance noise operational amplifier. Compared other operational amplifiers, such TL083, they show better noise performance, improved output drive capability considerably higher small-signal power bandwidths. This makes devices especially suitable application high quality professional audio equipment, instrumentation control circuits, telephone channel amplifiers. amps internally-compensated gain equal higher than, three. frequency response optimized with external compensation capacitor various applications (unity gain amplifier, capacitive load, slew rate, overshoot, etc.) very noise prime importance, recommended that 5534A version used which guaranteed noise specifications. APPLICATIONS Diode Protection Input input leads device protected from differential transients above ±0.6 internal back- -back diodes (Figure Their presence imposes -tocertain limitations amplifier dynamic characteristics related closed-loop gain slew rate. circuit deleted, device slew rate falls approximately input waveform will reach V/25 while output will have changed 10-3) only differential input signal then (VIN RI/RI approximately diode limiter will definitely active output distortion will occur; therefore, indicated. Next, sine wave input used with similar circuit. slew rate input waveform depends frequency exact expression
upper limit before slew rate distortion occurs small-signal (VIN conditions found setting slew rate That
LIMIT rads LIMIT
dV/dt
5534
Figure
Consider unity gain follower example. Assume signal input square wave with dV/dt peak amplitude shown (Figures compensation capacitor inserted
Figure
5534
-Vin
Figure
AND8177/D
External Compensation Network Improves Bandwidth
NE5534
using external lead-lag network, follower circuit slew rate small-signal bandwidth increased. This useful situations where closed-loop gain less than indicated. number examples shown subsequent figures. principle benefit using network approach that full slew rate bandwidth device retained, while impulse-related parameters such damping phase margin controlled choosing appropriate circuit constants. example, consider following configuration (Figure
GAIN
NETWORK
Figure
PHASE
-90o
NETWORKS -180o
Figure
Figure
major problem overcome poor phase margin leading instability. choosing network break frequency decade below unity gain crossover frequency (30- MHz), phase gain margin improved (see Figures appropriate value Setting network break frequency MHz, calculated:
VOUT
NOTES CC(1) NE5533/34 [See graph under typical performance characteristics]
Figure Unity Gain Non-Inverting Configuration
Rules Examples
Compensation Using Pins (Limited Bandwidth Slew Rate)
single-pole zero inserted transfer function will give added phase margin, depending network values.
Calculating Lead-Lag Network (UGBW) UGBW
VOUT
Figure Unity Gain Inverting Configuration
where
AND8177/D
External Compensation Wide-Band Voltage-Follower Shunt Capacitance Compensation
30MHz DIST
VOUT
CDIST Distributed Capacitance Many audio circuits involve carefully-tailored frequency responses. Pre-emphasis used recording mediums reduce noise produce flat frequency response. most often used de-emphasis curves broadcast home entertainment systems shown Figures through following page. Operational amplifiers well suited these applications because their high gain easily-tailored frequency response.
NOTE:
Input diodes limit differential <0.5V
Figure External Compensation Wideband Voltage Follower
AND8177/D
RELATIVE GAIN 9dB) FREQUENCY (Hz) 100K TURN OVER FREQUENCIES 2122 RELATIVE GAIN (dB) TIME CONSTANTS 3150 FREQUENCY (Hz) 100K TURN OVER FREQUENCIES 3180 TIME CONSTANTS 3150
Figure RIAA Equalization
RELATIVE GAIN (dB)
Figure Standard Playback 71/2
TURN OVER FREQUENCIES 1326 TIME CONSTANTS 3150
100K
FREQUENCY (Hz)
Figure 3.75 Tape Equalization
RELATIVE GAIN (dB) RELATIVE GAIN (dB) FREQUENCY (Hz) 100K TURN OVER FREQUENCY TURN OVER FREQUENCY 2122 TIME CONSTANT
FREQUENCY (Hz)
100K
Figure Base Treble Curve
Figure Standard Broadcast Equalization
AND8177/D
RIAA PREAMP USING NE5534 preamplifier phono equalization shown Figure with theoretical actual circuit response.
0.22 INPUT NOTES: *Select provide specified transducer loading. Output Noise 0.8mVRMS (with input shorted) 0.0033 0.003 RIAA
frequency boost provided inductance magnetic cartridge with network providing necessary break points approximate theoretical RIAA curve.
NE5534 -OUTPUT
GAIN BODE PLOT ACTUAL RESPONSE GAIN FREQUENCY (Hz) ACTUAL RESPONSE BODE PLOT
FREQUENCY (Hz)
Bode Plot RIAA Equalization Response Realized Actual Circuit Using 531.
Bode Plot Equalization Response Realized Actual Circuit Using 531.
Figure Preamplifier RIAA/NAB Compensation
AND8177/D
RUMBLE FILTER Following amplifier stage, rumble scratch filters often used improve overall quality. Such filter designed with amps uses 2-pole Butterworth
NE5534 0.0056 0.0022 NE5534
approach features switchable break points. With circuit Figure degree filtering from fairly sharp none switch-selectable.
RUMBLE POSITION FREQ. FLAT SCRATCH POSITION FREQ. FLAT
Figure Rumble/Scratch Filter
TONE CONTROL Tone control audio systems involves altering flat response order attain more frequencies more high ones, dependent upon listener preference. circuit
INPUT
Figure provides bass treble boost variable resistance. actual response circuit shown also.
+140
BASS BOOST TREBLE BOOST
0.033 0.033
OUTPUT PEAK PEAK
GAIN (dB)
0.033
0.033
BASS
TREBLE
NOTES: Amplifier NE531 301. Frequency compensation, unity gain non-inverting amplifiers, must used. Turn-over frequency Base boost bass treble boost treble
1,000
10,000
100,000
FREQUENCY (Hz)
Figure Tone Control Circuit Operational Amplifiers
AND8177/D
BALANCE LOUDNESS AMPLIFIER Figure shows combination balance loudness controls. non-linearity human hearing system, frequencies must boosted listening
LEVEL 5534
levels. Balance, level, loudness controls provide listening controls produce desired music response.
5534
LOUDNESS
BALANCE
5534
0.33
1290
5534
0.33
Figure Balance Amplifier with Loudness Control
AND8177/D
VOLTAGE CURRENT OFFSET ADJUSTMENTS Many amplifiers include necessary connections provide external offset adjustments. Many times, however, becomes necessary select device possessing external adjustments. Figures suggest some possible arrangements off-circuitry. circuitry
INPUT NE5534
Figure provides sufficient current into input cancel bias current requirement. Although more simplified arrangements possible, addition provide fixed current level thus, bias cancellation provided without regard input voltage level.
OUTPUT
NE5534
OUTPUT
RANGE
RANGE INPUT GAIN
Figure Universal Offset Null Inverting Amplifiers
Figure Universal Offset Null Non-Inverting Amplifiers
BIAS CURRENT COMPENSATION
NE5534 VOUT
SELECT DESIRED CURRENT
Figure Bias Current Compensation
ChipFET trademark Vishay Siliconix. POWERMITE registered trademark used under license from Microsemi Corporation.
Semiconductor registered trademarks Semiconductor Components Industries, (SCILLC). SCILLC reserves right make changes without further notice products herein. SCILLC makes warranty, representation guarantee regarding suitability products particular purpose, does SCILLC assume liability arising application product circuit, specifically disclaims liability, including without limitation special, consequential incidental damages. "Typical" parameters which provided SCILLC data sheets and/or specifications vary different applications actual performance vary over time. operating parameters, including "Typicals" must validated each customer application customer's technical experts. SCILLC does convey license under patent rights rights others. SCILLC products designed, intended, authorized components systems intended surgical implant into body, other applications intended support sustain life, other application which failure SCILLC product could create situation where personal injury death occur. Should Buyer purchase SCILLC products such unintended unauthorized application, Buyer shall indemnify hold SCILLC officers, employees, subsidiaries, affiliates, distributors harmless against claims, costs, damages, expenses, reasonable attorney fees arising directly indirectly, claim personal injury death associated with such unintended unauthorized use, even such claim alleges that SCILLC negligent regarding design manufacture part. SCILLC Equal Opportunity/Affirmative Action Employer. This literature subject applicable copyright laws resale manner.
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AND8177/D

Audio Circuits Using NE5532/34 following will explain some Semiconduct

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