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CS289 Datasheet(PDF) 4 Page - ON Semiconductor |
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CS289 Datasheet(HTML) 4 Page - ON Semiconductor |
4 / 8 page 4 Function Generator Output ( ∅): VCC=13.1V, TA=25°C ∅=ArcTan (Measured angle after calibration at 180°C) For ∅A=45°, 90°, 135°, 180°, 225°, 270°, (Desired angle) ( ∅A-∅M)≤4.0° Temperature Sensitivity: VCC=13.1V ∆∅MT=∅M (T=25°C) -∅M (-20°C≤T≤+85°C) ( ∆∅MT)≤3.5°C, -20°C≤T≤+85°C Voltage Sensitivity: TA=25°C ∆∅MV=∅M (VCC=13.1V) -∅M (11.3V≤VCC≤15V) ( ∆∅MV)≤2°, 11.3V≤VCC≤15V Vsine Vcos B+ 100 Ω ZENER 5.4V SINE 80mH 225 80mH 225 B+ 15 18V R2 2k Ω 2k Ω 1k Ω EΘ TACH INPUT RT 180k Ω * COUT 1 µF ±10% R1 1k Ω CT 0.01 µF * ADJUST FOR TRIMMING CS289 Figure 1. Functional Diagram of CS289 Circuit. The input frequency is buffered through a transistor, then applied to the charge pump for frequency-to-voltage con- version (Figure 1). The charge pump output voltage, E ∅, will range from 2.1V with no input ( ∅= 0°) to 7.1V at ∅ = 270°. The charge that appears on CT is reflected to COUT through a Norton amplifier. The frequency applied at SQIN charges and discharges CT through R1 and R2. COUT reflects the charge as a voltage across resistor RT. Circuit Description Charge Pump Function Generator/Sine and Cosine Amplifiers The output waveforms of the sine and cosine amplifiers are derived by On-Chip Amplifier/Comparator circuitry. The various trip points for the circuit (i.e. 90°, 180°, 270°) are determined by an internal resistor divider connected to the voltage regulator. The voltage E ∅ is compared to the divider network by the function generator circuitry. Use of an external zener reference at VZ allows both sine and cosine amplifiers to swing positive and negative with respect to this reference. The output magnitudes and directions have the relationship as shown in Typical Characteristics diagrams. Note: Pin connections referenced are for the 14L DIP. |
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