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83C554 Datasheet(PDF) 28 Page - NXP Semiconductors |
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83C554 Datasheet(HTML) 28 Page - NXP Semiconductors |
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28 / 76 page  Philips Semiconductors Preliminary specification 80C554/83C554/87C554 80C51 8-bit microcontroller – 6 clock operation 16K/512 OTP/ROM/ROMless, 7 channel 10 bit A/D, I2C, PWM, capture/compare, high I/O, 64L LQFP 2000 Nov 10 28 RS VANALOG INPUT CS CC TO COMPARATOR + IN IN+1 SmN+1 SmN RmN+1 RmN MULTIPLEXER Rm = 0.5 - 3 k Ω CS + CC = 15 pF maximum RS = Recommended < 9.6 kΩ for 1 LSB @ 12 MHz NOTE: Because the analog to digital converter has a sampled-data comparator, the input looks capacitive to a source. When a conversion is initiated, switch Sm closes for 8tCY (4 µs @ 12 MHz crystal frequency) during which time capacitance CS + CC is charged. It should be noted that the sampling causes the analog input to present a varying load to an analog source. SU01449 Figure 25. A/D Input: Equivalent Circuit 0 q 2q 3q 4q 5q Vin CODE OUT 100 000 001 010 011 101 QUANTIZATION ERROR q = LSB = 5 mV Vin – Vdigital + q/2 – q/2 Vin SYMMETRICAL QUANTIZATION ERROR SU00963 Figure 26. Effective Conversion Characteristic |
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