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SA572DTBR2G Datasheet(PDF) 9 Page - ON Semiconductor |
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SA572DTBR2G Datasheet(HTML) 9 Page - ON Semiconductor |
9 / 12 page SA572 http://onsemi.com 9 BUFFER D G 10 mF 2.2 mF C3 VIN VOUT Figure 9. Automatic Level Control R3 17.3k 9.1k 9.1k RDC1 R4 RDC2 CDC C5 R5 5532 − + VOUT 100k + 22 mF CA + 1 mF CR + 10 mF + 2.2 mF C2 + 2.2 mF + 2.2 mF C1 + R1 3.3k RX 6.8k ATTACK CAP RECOVERY CAP V+ V− TO THD TRIM PIN OF 572 PINS 6, 10 1k + 3, 13 4, 12 5, 11 2, 14 7, 9 DC 1 2 3 R2 Automatic Level Control (ALC) In the ALC configuration, the variable gain cell is placed in the feedback loop of the operational amplifier and the rectifier is connected to the input. As the input amplitude increases above the crossover point, the overall system gain decreases proportionally, holding the output amplitude constant. As the input amplitude decreases below the crossover point, the overall system gain increases proportionally, holding the output amplitude at the same constant level. Gain + R1 R2 I1 2R3 VIN(avg) where: R1 = 6.8 kW (Internal) R2 = 3.3 kW R3 = 17.3 kW I1 = 140 mA The output DC level can be set using the following equation: V OUT DC + 1 ) R DC1 ) RDC2 R4 VREF where: R4 = 100 kW RDC1 = RDC2 = 9.1 kW VREF = 2.5 V The output level is calculated using the following equation: VOUT_LEVEL + R1 R2 I1 2R3 VIN VIN (avg) where: R1 = 6.8 kW (Internal) R2 = 3.3 kW R3 = 17.3 kW I1 = 140 mA VIN VIN (avg) + p 22 + 1.11 (for sine waves) Note that for very low input levels, ALC may not be desired and to limit the maximum gain, resistor RX has been added. Gain max. + R1)Rx VREF ·R2 ·IB 2R3 Rx ^ ((desired max gain) 26 kW) * 10 kW |
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