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LM359J Scheda tecnica(PDF) 11 Page - National Semiconductor (TI) |
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LM359J Scheda tecnica(HTML) 11 Page - National Semiconductor (TI) |
11 / 24 page Application Hints (Continued) 3. Determine maximum value for R f to provide stable DC biasing Optimum output DC level for maximum symmetrical swing without clipping is: R f(MAX) can now be found: This value should not be exceeded for predictable DC bias- ing. 4. Select R s to be large enough so as not to appreciably load the input termination resistance: R s ≥ 750Ω; Let Rs = 750Ω 5. Select R f for appropriate gain: 7.5 k Ω is less than the calculated R f(MAX) so DC predictability is insured. 6. Since R f = 7.5k, for the output to be biased to 5.1 VDC, the reference current I IN(+) must be: Now R b can be found by: 7. Select C i to provide the proper gain for the 8 Hz mini- mum input frequency: A larger value of C i will allow a flat frequency response down to 8 Hz and a 0.01 µF ceramic capacitor in parallel with C i will maintain high frequency gain accuracy. 8. Test for peaking of the frequency response and add a feedback “lead” capacitor to compensate if necessary. A NON-INVERTING VIDEO AMPLIFIER For this case several design considerations must be dealt with. • The output voltage (AC and DC) is strictly a function of the size of the feedback resistor and the sum of AC and DC “mirror current” flowing into the (+) input. • The amplifier always has 100% current feedback so ex- ternal compensation is required. Add a small (1 pF–5 pF) feedback capacitance to leave the amplifier’s open loop response and slew rate unaffected. • To prevent saturating the mirror stage the total AC and DC current flowing into the amplifier’s (+) input should be less than 2 mA. • The output’s maximum negative swing is one diode above ground due to the V BE diode clamp at the (−) input. Final Circuit Using Standard 5% Tolerance Resistor Values: DS007788-18 Circuit Performance: DS007788-19 Vo(DC) = 5.1V Differential phase error < 1˚ for 3.58 MHz fIN Differential gain error < 0.5% for 3.58 MHz fIN f−3 dB low = 2.5 Hz www.national.com 11 |
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