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CS8191 Scheda tecnica(PDF) 7 Page - ON Semiconductor |
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CS8191 Scheda tecnica(HTML) 7 Page - ON Semiconductor |
7 / 12 page CS8191 http://onsemi.com 7 Ripple voltage on the F/V output causes pointer or needle flutter especially at low input frequencies. The response time of the F/V is determined by the time constant formed by RT and C4. Increasing the value of C4 will reduce the ripple on the F/V output but will also increase the response time. An increase in response time causes a very slow meter movement and may be unacceptable for many applications. Figure 7. Partial Schematic of Input and Charge Pump VREG FREQIN SQOUT R3 2.7 V QSQUARE CCP R4 VC(t) CP+ Q1 Q2 Q3 0.25 V 2.0 V CP– RT C4 F/VOUT F to V + – + – + – Figure 8. Timing Diagram of FREQIN and ICP VREG FREQIN SQOUT 0 ICP+ tCHG T VCP+ 0 0 VCC tDCHG |
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