NE570N Philips Semiconductors, NE570N Datasheet
NE570N
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NE570N Summary of contents
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NE570 Compandor Product data Supersedes data of 1990 Jun 07 INTEGRATED CIRCUITS 2003 Apr 03 ...
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... Philips Semiconductors Compandor GENERAL DESCRIPTION The NE570 is a versatile low cost dual gain control circuit in which either channel may be used as a dynamic range compressor or expandor. Each channel has a full-wave rectifier to detect the average value of the signal, a linerarized temperature-compensated variable gain cell, and an operational amplifier. ...
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... Philips Semiconductors Compandor ABSOLUTE MAXIMUM RATINGS SYMBOL V Maximum operating voltage CC T Operating ambient temperature range amb P Power dissipation D AC ELECTRICAL CHARACTERISTICS unless otherwise stated. CC amb SYMBOL SYMBOL PARAMETER PARAMETER V Supply voltage CC I Supply current CC I Output current capability OUT SR Output slew rate ...
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... Philips Semiconductors Compandor CIRCUIT DESCRIPTION The NE570 compandor building blocks, as shown in the block diagram, are a full-wave rectifier, a variable gain cell, an operational amplifier and a bias system. The arrangement of these blocks in the IC result in a circuit which can perform well with few external components, yet can be adapted to many diverse applications. ...
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... Philips Semiconductors Compandor INTRODUCTION Much interest has been expressed in high performance electronic gain control circuits. For non-critical applications, an integrated circuit operational transconductance amplifier can be used, but when high-performance is required, one has to resort to complex discrete circuitry with many expensive, well-matched components. This paper describes an inexpensive integrated circuit, the NE570 Compandor, which offers a pair of high performance gain control circuits featuring low distortion (< ...
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... Philips Semiconductors Compandor Figure 8 shows the hook-up for a compressor. This is essentially an expander placed in the feedback loop of the op amp. The G cell is set-up to provide AC feedback only separate DC feedback loop is provided by the two R and C . The values determine the DC bias at the output of the op amp. The output will ...
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... Philips Semiconductors Compandor At very low input signal levels the bias current of Q2, (typically 50 nA), will become significant as it must be supplied by Q5. Another low level error can be caused by DC coupling into the rectifier offset voltage exists between the V base of Q2, an error current of V /R1 will be generated ...
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... Philips Semiconductors Compandor which means our overall offsets are typically about mV. The distortion is not affected by the magnitude of the gain control current, and it does not increase as the gain is changed. This second harmonic distortion could be eliminated by making perfect transistors, but since that would be difficult, we have had to resort to other methods ...
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... Philips Semiconductors Compandor OPERATIONAL AMPLIFIER The main op amp shown in the chip block diagram is equivalent to a 741 with a 1 MHz bandwidth. Figure 18 shows the basic circuit. Split collectors are used in the input pair to reduce g compensation capacitor of just 10 pF may be used. The output stage, although capable of output currents in excess of 20 mA, is biased for a low quiescent current to conserve power ...
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... Philips Semiconductors Compandor SO16: plastic small outline package; 16 leads; body width 7.5 mm 2003 Apr 03 10 Product data NE570 SOT162-1 ...
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... Philips Semiconductors Compandor REVISION HISTORY Rev Date Description _3 20030403 Product data (9397 750 11356). ECN 853-2421 29759 of 03 April 2003. Supersedes data for part-type NE570 included in Product specification NE570/571/SA571 of June 7, 1990. Modifications: Remove all data for part types NE571 and SA571. ...
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... Life support — These products are not designed for use in life support appliances, devices, or systems where malfunction of these products can reasonably be expected to result in personal injury. Philips Semiconductors customers using or selling these products for use in such applications their own risk and agree to fully indemnify Philips Semiconductors for any damages resulting from such application. Right to make changes — ...