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CA3140E Datasheet(PDF) 14 Page - Intersil Corporation |
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CA3140E Datasheet(HTML) 14 Page - Intersil Corporation |
14 / 19 page 14 Tone Control Circuits High slew rate, wide bandwidth, high output voltage capability and high input impedance are all characteristics required of tone control amplifiers. Two tone control circuits that exploit these characteristics of the CA3140 are shown in Figures 19 and 20. The first circuit, shown in Figure 20, is the Baxandall tone control circuit which provides unity gain at midband and uses standard linear potentiometers. The high input impedance of the CA3140 makes possible the use of low- cost, low-value, small size capacitors, as well as reduced load of the driving stage. Bass treble boost and cut are ±15dB at 100Hz and 10kHz, respectively. Full peak-to-peak output is available up to at least 20kHz due to the high slew rate of the CA3140. The amplifier gain is 3dB down from its “flat” position at 70kHz. Figure 19 shows another tone control circuit with similar boost and cut specifications. The wideband gain of this circuit is equal to the ultimate boost or cut plus one, which in this case is a gain of eleven. For 20dB boost and cut, the input loading of this circuit is essentially equal to the value of the resistance from Terminal No. 3 to ground. A detailed analysis of this circuit is given in “An IC Operational Transconductance Amplifier (OTA) With Power Capability” by L. Kaplan and H. Wittlinger, IEEE Transactions on Broadcast and Television Receivers, Vol. BTR-18, No. 3, August, 1972. FIGURE 19. TONE CONTROL CIRCUIT USING CA3130 SERIES (20dB MIDBAND GAIN) FIGURE 20. BAXANDALL TONE CONTROL CIRCUIT USING CA3140 SERIES 4 7 + CA3140 - +30V 3 2 0.1 µF 6 0.005 µF 0.1 µF 2.2M Ω 2.2M Ω 5.1 M Ω 0.012 µF 0.001 µF 0.022 µF 2 µF 18k Ω 0.0022 µF 200k Ω (LINEAR) 100 pF 100pF BOOST TREBLE CUT BOOST BASS CUT 10k Ω 1M Ω CCW (LOG) 100k Ω TONE CONTROL NETWORK FOR SINGLE SUPPLY - + +15V 3 0.1 µF 0.005 µF 5.1M Ω 0.1 µF -15V 2 6 7 4 + CA3140 - TONE CONTROL NETWORK FOR DUAL SUPPLIES NOTES: 5. 20dB Flat Position Gain. 6. ±15dB Bass and Treble Boost and Cut at 100Hz and 10kHz, respectively. 7. 25VP-P output at 20kHz. 8. -3dB at 24kHz from 1kHz reference. 4 7 + CA3140 - +32V 3 0.1 2.2M Ω 2.2 M Ω FOR SINGLE SUPPLY µF 6 2 0.1 µF 20pF 750 pF 750 pF 2.2M Ω 0.047 µF BOOST TREBLE CUT 51k Ω 5M Ω (LINEAR) 51k Ω TONE CONTROL NETWORK BOOST BASS CUT 240k Ω 5M Ω (LINEAR) 240k Ω +15V 3 0.1 µF 0.047 µF 0.1 µF -15V 2 6 7 4 + CA3140 - FOR DUAL SUPPLIES NOTES: 9. ±15dB Bass and Treble Boost and Cut at 100Hz and 10kHz, Respectively. 10. 25VP-P Output at 20kHz. 11. -3dB at 70kHz from 1kHz Reference. 12. 0dB Flat Position Gain. TONE CONTROL NETWORK CA3140, CA3140A |
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