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LM1818 Arkusz danych(PDF) 10 Page - National Semiconductor (TI) |
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LM1818 Arkusz danych(HTML) 10 Page - National Semiconductor (TI) |
10 / 14 page Application Hints (Continued) TLH7894 – 11 FIGURE 8B Waveform for Anti-Pop Circuit External Components (Refer toFigure 9 Monaural Application Circuit) Component External Component Function Normal Range of Value R1 Used in conjunction with varying impedance of pin 5 forming a resistor divider 500X –20 kX network to reduce input level in automatic level control circuit C2 Forms a noise reduction system by varying bandwidth as a function of the 001 mF – 05 mF changing impedance on pin 5 With a small input signal the bandwidth is reduced by R1 and C2 As the input level increases so does the bandwidth C1 C3 Coupling capacitors Because these are part of the source impedance it is 05 mF–10 mF important to use the larger values to keep low frequency source impedance at a minimum C4 Radio frequency interference roll-off capacitor 100 pF – 300 pF R2 Playback response equalization C5 and R3 form a pole in the amplifier 50X – 200X response at 50 Hz C5 and R4 form a zero in the response at 13 kHz for R3 47 kX – 33 MX 120 ms equalization and 23 kHz for 70 ms equalization R4 2kX – 200 kX C5 R5 Microphone preamplifier gain equalization 50X – 200X R6 5kX – 200 kX R7 DC feedback path Provides a low impedance path to the negative input in 0 – 2 kX order to sink the 50 mA negative input amplifier current C6 R9 R7 and C7 R8 200X –5 kX provide isolation from the output so that adequate gain can be obtained at 20 R9 1kX –30 kX Hz This 2-pole technique also provides fast turn-ON settling time C6 200 mF – 1000 mF C7 0 – 100 mF C8 Preamplifier output to monitor amplifier input coupling 005 mF–1 mF C9 ALC coupling capacitor Note that ALC input impedance is 2 kX 01 mF–5 mF R10 These components bias the monitor amplifier output to half supply since the 10 kX – 100 kX amplifier is unity gain at DC This allows for maximum output swing on a R11 10 kX – 100 kX varying supply R12 10 kX – 100 kX C10 1 mF – 100 mF 10 |
Podobny numer części - LM1818 |
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Podobny opis - LM1818 |
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