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MC3303 Scheda tecnica(PDF) 5 Page - STMicroelectronics |
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MC3303 Scheda tecnica(HTML) 5 Page - STMicroelectronics |
5 / 10 page MC3303 - MC3403 - MC3503 5/10 CIRCUIT DESCRIPTION The MC3403 is made using four internally com- pensated, two-stage operational amplifiers. The first stage of each consists of differential input de- vices Q24 and Q22 with input buffer transistors Q25 and Q21 and the differential to single ended converter Q3 and Q4. The first stage performs not only the first stage gain function but also performs the level shifting and transonductance reduction functions. By reducing the transconductance a smaller compensation capacitor (only 8pF) can be employed, thus saving chip area. The transconductance reduction is accomplished by splitting the collectors of Q24 and Q22. Another feature of this input stage is that the input com- mon-mode range can include the negative supply fo ground, in single supply operation, without sat- uration either the input devices or the differential to single-ended converter. The second stage consists of a standard current source load amplifier stage. The output stage is unique because it allows the output to swing to ground in single supply operation and yet does not exhibit any crossover distortion in split supply op- erations. This is possible because class AB oper- ation is utilized. Each amplifier is biased from an internal voltage regulator which has a low temperature coefficient thus giving each amplifier good temperature char- acteristics as well as excellent power supply rejec- tion. TYPICAL PERFORMANCE CURVES APPLICATION INFORMATION VOLTAGE REFERENCE WIEN BRIDGE OSCILLATOR 20µs/div. AV = 100 1/4 MC3403 VO VCC VCC R1 10k Ω VO = VCC 1 2 VO R1 R1 + R2 VCC = R2 10k Ω 50k Ω 5k Ω 10k Ω 1/4 MC3403 VO VCC V(ref) R C C R V(ref) = 1 2 VCC f O = 1 2 π RC For f O = 1kHz R = 16k Ω C = 0.01 µF |
Codice articolo simile - MC3303_01 |
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Descrizione simile - MC3303_01 |
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