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M80C196KB Scheda tecnica(PDF) 28 Page - Intel Corporation |
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M80C196KB Scheda tecnica(HTML) 28 Page - Intel Corporation |
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28 / 30 page  M80C196KB A TO D CHARACTERISTICS There are two modes of AD operation with or with- out clock prescaler The speed of the AD converter can be adjusted by setting a clock prescaler on or off At high frequencies more time is needed for the comparator to settle The maximum frequency with the clock prescaler disabled is 8 MHz The conver- sion times with the prescaler turned on or off is shown in the table below The converter is ratiometric so the absolute accuracy is directly dependent on the accuracy and stability of VREF VREF must be close to VCC since it supplies both the resistor ladder and the digital sec- tion of the converter AD CONVERTER SPECIFICATIONS The specifications given below assume adherence to the Operating Conditions section of this data sheet Testing is performed in Mode 2 with VREF e 512V and 12 MHz on XTAL1 Clock Prescaler On Clock Prescaler Off IOC24 e 0 IOC24 e 1 Mode 0 – 158 States Mode 2 – 91 States 2633 ms 12 MHz 2275 ms 8 MHz AD CHARACTERISTICS (Over Specified Operating Conditions) Parameter Typical (1) Minimum Maximum Units Notes Resolution 256 1024 Levels 10 Bits Absolute Error 0 g 4 LSBs Full Scale Error b 05 g05 LSBs Zero Offset Error g 05 LSBs Non-Linearity 0 g 4 LSBs Differential Non-Linearity 0 g 2 LSBs Channel-to-Channel Matching 0 g 1 LSBs Repeatability g 025 LSBs Temperature Coefficients Offset 0009 LSB C Full Scale 0009 LSB C Differential Non-Linearity 0009 LSB C Off Isolation b 60 dB 2 3 Feedthrough b 60 dB 2 VCC Power Supply Rejection b 60 dB 2 Input Resistance 750 12K X DC Input Leakage 0 30 m A Sample Time Slow Mode 15 States 4 Fast Mode 8 States 4 Input Capacitance 3 pF NOTES An ‘‘LSB’’ as used here has a value of approximately 5 mV 1 These values are expected for most parts at 25 C but are not tested or guaranteed 2 DC to 100 KHz 3 Multiplexer Break-Before-Make Guaranteed 4 One state e 167 ns at 12 MHz 250 ns at 8 MHz 28 |
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