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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AT90LS4433-4AI датащи(PDF) 64 Page - ATMEL Corporation |
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AT90LS4433-4AI датащи(HTML) 64 Page - ATMEL Corporation |
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64 / 126 page  64 AT90S/LS4433 1042H–AVR–04/03 Analog-to-Digital Converter Features • 10-bit Resolution • ±2 LSB Absolute Accuracy • 0.5 LSB Integral Non-linearity • 65 - 260 µs Conversion Time • Up to 15 kSPS • Six Multiplexed Input Channels • Rail-to-Rail Input Range • Free Run or Single Conversion Mode • Interrupt on ADC Conversion Complete • Sleep Mode Noise Canceler The AT90S4433 features a 10-bit successive approximation ADC. The ADC is con- nected to a 6-channel Analog Multiplexer, which allows each pin of Port C to be used as an input for the ADC. The ADC contains a Sample and Hold Amplifier, which ensures that the input voltage to the ADC is held at a constant level during conversion. A block diagram of the ADC is shown in Figure 44. The ADC has two separate analog supply voltage pins: AVCC and AGND. AGND must be connected to GND, and the voltage on AVCC must not differ from V CC more than ±0.3V. See the section “ADC Noise Canceling Techniques” on page 70 for how to con- nect these pins. An external reference voltage must be applied to the AREF pin. This voltage must be in the range 2.0 - AVCC. Figure 44. Analog-to-Digital Converter Block Schematic ADC CONVERSION COMPLETE IRQ 8-BIT DATA BUS 90 ADC MULTIPLEXER SELECT (ADMUX) ADC CTRL & STATUS REGISTER (ADCSR) ADC DATA REGISTER (ADCH/ADCL) 6- CHANNEL MUX CONVERSION LOGIC 10-BIT DAC + - SAMPLE & HOLD COMPARATOR Analog Inputs External Reference Voltage |
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