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LM1818 Datasheet(PDF) 6 Page - National Semiconductor (TI) |
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LM1818 Datasheet(HTML) 6 Page - National Semiconductor (TI) |
6 / 14 page Typical Performance Characteristics Automatic Level Control (ALC) Response Characteristic Preamp Input Noise Voltage Preamp Input Noise Current TLH7894 – 5 Application Hints PREAMPLIFIERS (Figure 5) There are 2 identical preamplifiers with 1 common output pin on the IC One amplifies low level inputs such as a mi- crophone in the record mode and another amplifies the sig- nal from the playback head in the playback mode The am- plifiers use a common capacitor C6 to set the low frequen- cy pole of the closed loop responses On the playback am- plifier the collector of the input device is made available so that an external low noise device can be connected in crit- ical applications When using an external low noise transis- tor pins 17 and 18 of the IC are shorted together to ensure that the internal input transistor is turned OFF and the exter- nal transistor’s collector is tied to pin 19 The input and feedback connections are now made to the external input transistor The amplifiers are stable for all gains above 5 and have a typical open loop gain of 100 dB R8 and R9 enable C6 to be quickly charged and set the DC gain Inter- nal biasing provides a DC voltage independent of tempera- ture at pin 17 so that the preamplifier DC output will remain relatively constant with temperature Supply decoupling is provided by an internal regulator Additional decoupling can be added for the input stages by increasing the size of the capacitor on pin 20 of the IC A fast charging circuit is con- nected to the preamplifiers’ input capacitors (pins 16 and 17) to decrease the turn-ON time Larger input capacitors decrease the noise by reducing the source impedance at lower frequencies where 1f noise current produces an in- put noise voltage The input resistance of the preamplifiers is typically 50 kX TLH7894 – 6 Quiescent DC Output Voltage VDCe 1aR9R8J (05b50c10b6R2)VifR2aR3l10RE where RE e R8R9 R8 a R9 AC Voltage Gain AAC e R4 a R3 1 a sC5R3 R2 a 1 TLH7894 – 7 FIGURE 5 Preamplifier 6 |
Número de pieza similar - LM1818 |
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Descripción similar - LM1818 |
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