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CA3130AM Scheda tecnica(PDF) 13 Page - Intersil Corporation |
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CA3130AM Scheda tecnica(HTML) 13 Page - Intersil Corporation |
13 / 17 page 13 The heart of the frequency-determining system is an operational-transconductance-amplifier (OTA) (see Note 10), lC1, operated as a voltage-controlled current-source. The output, IO, is a current applied directly to the integrating capacitor, C1, in the feedback loop of the integrator lC2, using a CA3130, to provide the triangular-wave output. Potentiometer R2 is used to adjust the circuit for slope symmetry of positive-going and negative-going signal excursions. Another CA3130, IC3, is used as a controlled switch to set the excursion limits of the triangular output from the integrator circuit. Capacitor C2 is a “peaking adjustment” to optimize the high-frequency square-wave performance of the circuit. Potentiometer R3 is adjustable to perfect the “amplitude symmetry” of the square-wave output signals. Output from the threshold detector is fed back via resistor R4 to the input of lC1 so as to toggle the current source from plus to minus in generating the linear triangular wave. Operation with Output-Stage Power-Booster The current-sourcing and-sinking capability of the CA3130 output stage is easily supplemented to provide power-boost capability. In the circuit of Figure 17, three CMOS transistor- pairs in a single CA3600E (see Note 12) lC array are shown parallel connected with the output stage in the CA3130. In the Class A mode of CA3600E shown, a typical device consumes 20mA of supply current at 15V operation. This arrangement boosts the current-handling capability of the CA3130 output stage by about 2.5X. The amplifier circuit in Figure 17 employs feedback to establish a closed-loop gain of 48dB. The typical large-signal bandwidth (-3dB) is 50kHz. NOTE: 9. See file number 619 for technical information. 7 4 6 3 2 R1 100k Ω R2 100k Ω R3 100k Ω ON-PERIOD ADJUST 1M Ω 2k Ω 2k Ω OFF-PERIOD ADJUST 1M Ω +15V 0.01 µF OUTPUT 2k Ω 0.001 µF 0.01 µF 0.1 µF 1 µF S1 CA3130 + - FIGURE 15. PULSE GENERATOR (ASTABLE MULTIVIBRATOR) WITH PROVISIONS FOR INDEPENDENT CONTROL OF “ON” AND “OFF” PERIODS FREQUENCY RANGE: POSITION OF S1 0.001 µF 0.01 µF 0.1 µF 1 µF PULSE PERIOD 4 µs to 1ms 40 µs to 10ms 0.4ms to 100ms 4ms to 1s NOTE: 10. See file number 475 and AN6668 for technical information. FIGURE 16. FUNCTION GENERATOR (FREQUENCY CAN BE VARIED 1,000,000/1 WITH A SINGLE CONTROL) 6 3 2 1 4 7 5 6 2 3 4 7 8 1 5 4 6 7 3 2 R4 270k Ω +7.5V VOLTAGE-CONTROLLED CURRENT SOURCE IC1 3k Ω 3k Ω 10M Ω +7.5V R2 100k Ω SLOPE SYMMETRY ADJUST VOLTAGE CONTROLLED INPUT -7.5V 10k Ω 10k Ω R1 -7.5V FREQUENCY ADJUST (100kHz MAX) -7.5V +7.5V IO IC2 +7.5V C1 100pF INTEGRATOR -7.5V 56pF CA3130 + - CA3080A + - 39k Ω 3 - 30pF C2 ADJUST HIGH - FREQ. DETECTOR THRESHOLD 150k Ω IC3 +7.5V CA3130 + - R3 100k Ω AMPLITUDE SYMMETRY ADJUST 22k Ω -7.5V (NOTE 10) CA3130, CA3130A |
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