NE570 ON Semiconductor, NE570 Datasheet
NE570
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NE570 Summary of contents
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... NE570 Compandor 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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... Input to V and V grounded 775 mV . RMS 5. Relative to value NE570 External Capacitor Pinout for Rectifier 1 Rectifier 1 Input Variable Gain Cell 1 Input Ground Inverted Input 1 R3 Pinout 1 Output 1 Total Harmonic Distortion Trim 1 Total Harmonic Distortion Trim 2 Output 2 R3 Pinout 2 ...
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... 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. The full− ...
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... CIRCUIT BACKGROUND The NE570 Compandor was originally designed to satisfy the requirements of the telephone system. When several telephone channels are multiplexed onto a common line, the resulting signal−to−noise ratio is poor and companding is used to allow a wider dynamic range to be passed through the channel ...
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... B = 140 EXTERNAL COMPONENTS Figure 6. Basic Expander NE570 Figure 7 shows the hook−up for a compressor. This is essentially an expander placed in the feedback loop of the op amp. The DG cell is set−up to provide AC feedback only for the a separate DC feedback loop is provided by the two ...
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... C R Figure 8. Rectifier Concept NE570 respectively. ICs such as this have typical NPN ’s of 200 and PNP ’s of 40. The ’s of 0.995 and 0.975 will produce errors of 0.5% on negative swings and 2.5% on positive swings. The 1.5% average of these errors yields a mere 0.13 dB gain error. ...
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... Figure 12. Simplified DG Cell Schematic NE570 The op amp maintains the base and collector of Q ground potential (V input current I Q along with the current I 1 been set at twice the value of I The op amp has thus forced a linear current swing between ...
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... VCA GAIN (dB) Figure 15. Dynamic Range NE570 Control signal feedthrough is generated in the gain cell by imperfect device matching and mismatches in the current sources, I and will cause a small output signal. The distortion trim is G effective in nulling out any control signal feedthrough, but in general, the null for minimum feedthrough will be different than the null in distortion ...
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... SOIC−16 WB NE570DR2 SOIC−16 WB NE570DR2G SOIC−16 WB †For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging Specifications Brochure, BRD8011/D. NE570 Package Temperature Range + +70 C (Pb−Free + +70 C (Pb− ...
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... PROTRUSION. ALLOWABLE DAMBAR PROTRUSION SHALL BE 0.13 TOTAL IN EXCESS OF THE B DIMENSION AT MAXIMUM MATERIAL CONDITION. MILLIMETERS DIM MIN MAX A 2.35 2.65 A1 0.10 0.25 B 0.35 0.49 C 0.23 0.32 D 10.15 10.45 E 7.40 7.60 e 1.27 BSC H 10.05 10.55 h 0.25 0.75 L 0.50 0. Semiconductor Website: www.onsemi.com Order Literature: http://www.onsemi.com/orderlit For additional information, please contact your local Sales Representative NE570/D ...