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CS4121EDWF20 Datasheet(PDF) 7 Page - Cherry Semiconductor Corporation |
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CS4121EDWF20 Datasheet(HTML) 7 Page - Cherry Semiconductor Corporation |
7 / 8 page 7 Speedometer/Odometer or Tachometer Application R1 - 3.9, 500mW R2 - 10k½ R3 - 3k½ R4 - 1k½ RT - Trim Resistor +/- 20 PPM/¡C 243k½ C1 - 0.1µF C3 - 0.1µF C4 - 0.47µF CT - 0.0033µF, +/- 30 PPM/¡C D1 - 1A, 600 PIV D2 - 50V, 500mW Zener Note 1: For 58% Speed Input TMAX ² 5/fMAX where TMAX = CT(R3+R4) fMAX = maximum speed input frequency Note 1: The product of CT and RT have a direct effect on gain and therefore directly affect temperature compensation Note 2: CT Range; 20pF to .2µF Note 3: RT Range; 100k½ to 500k½ Note 4: The IC must be protected from transients above 60V and reverse battery conditions Note 5: Additional filtering on FREQIN lead may be required 1 CP+ 2 3 4 5 6 7 8 SQOUT FREQIN Gnd Gnd COS+ COS- VCC 16 15 14 13 12 11 10 9 CP- F/VOUT VREG Gnd Gnd SINE+ SINE- BIAS CT R3 C3 C1 D2 R1 D1 + C4 RT COSINE SINE Air Core Gauge 200 W Speedometer Gnd Battery Speedo Input R2 R4 1 CS8441 C2 Air Core Stepper Motor 200 W Odometer CP+ 1 CP+ 2 3 4 5 6 7 8 SQOUT FREQIN Gnd Gnd COS+ COS- VCC 16 15 14 13 12 11 10 9 CP- F/VOUT VREG Gnd Gnd SINE+ SINE- BIAS CT R3 C3 C1 D2 R1 D1 + C4 RT COSINE SINE Air Core Gauge 200 W Speedometer Gnd Battery Speedo Input R2 R4 CP+ Figure 6 Figure 7 |
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