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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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PC87570 датащи(PDF) 134 Page - National Semiconductor (TI) |
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PC87570 датащи(HTML) 134 Page - National Semiconductor (TI) |
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134 / 168 page  134 Device Specifications www.national.com 19.3 DC ELECTRICAL CHARACTERISTICS 19.3.1 Analog Table 19-6. DAC Characteristics 1. All parameters specified for 0 ° C ≤ T A ≤ 70° C. AVCC= 3.3V ± 10%, AVCC = 5.0V ± 10% unless otherwise specified. 2. Valid only for external VREF; value changes during the conversion. 3. The maximum difference between the ideal straight line reference and the actual conversion curves. 4. The maximum difference between an ideal step size of 1 LSB and any actual step size. 5. Either VREFI or VREFE, as set by bit 1 of ADCCNT1 Register. 6. The resistance between the device input and the internal analog input capacitance. 7. Time from when ADCCNT1.ADCEN = 1 until valid conversions are possible. 1. All parameters specified for 0 ° C ≤ T A ≤ 70° C. AVCC = 3.3V ± 10% or AVCC = 5.0V ± 10% unless otherwise specified. 2. The maximum difference between the ideal straight line reference and the actual conversion curves. 3. The maximum difference between an ideal step size of 1 LSB and any actual step size. Table 19-5. ADC Characteristics Parameter Symbol Conditions1 Min Typ Max Unit Internal Reference Voltage VREFI 2.375 2.5 2.625 V External Reference Voltage VREFE 2.375 AVCC V VREF Input DC resistance 2 IVREFE 536 K Ω Resolution RES 8 Bit Integral (non-linearity) Error3 INL ±0.5 LSB Differential (non-linearity) Error4 DNL ±0.5 LSB Offset Error OE ±1 LSB Gain Error GE ±1 LSB Input Voltage Range VIN 0VREF 5 V Analog Input Leakage Current IAL ±10 µA Analog Input Resistance6 RAIN 200 Ω Analog Input Capacitance CAIN 15 pF ADC Activation Time7 TACT 100 µs Parameter Symbol Conditions1 Min Typ Max Unit Resolution RES 8 Bit Integral (non-linearity) Error2 INL ±0.5 LSB Differential (non-linearity) Error3 DNL ±0.5 LSB Offset Error OE ±1 LSB Gain Error GE ±1 LSB Output Voltage Range Vout 0AVCC V Analog Output Resistance RS 234 K Ω Analog Output Capacitance CAO 10 15 pF |
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