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14 장 DAC and ADC

14 장 DAC and ADC. 학습개요. 이번 시간에는 ... “ DA, AD converter ” 에 대해 알아보겠습니다. 학 습 목 표. 이장에서는 주변장치 중에서 DA, AD converter 장치의 동작과정에 대하여 공부한다. 학 습 목 차. D/A CONVERTE A/D CONVERTER. D/A CONVERTER. D/A CONVERTER 개요. (1) D/A (Digital to Analog converter) 구조. ANALOG signal. DIGTAL signal.

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14 장 DAC and ADC

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  1. 14장 DAC and ADC Slide 1 (of 13)

  2. 학습개요 이번 시간에는... “DA, AD converter”에 대해 알아보겠습니다. 학 습 목 표 이장에서는 주변장치 중에서 DA, AD converter장치의 동작과정에 대하여 공부한다. 학 습 목 차 • D/A CONVERTE • A/D CONVERTER Slide 2 (of 13)

  3. D/A CONVERTER • D/A CONVERTER 개요 (1) D/A (Digital to Analog converter) 구조 ANALOG signal DIGTAL signal ANALOG REFERENCE SOURCE ◈ Digital to analog converter Interface DIGITAL SIGNAL DAC CPU OR PIO D0 D1 D2 D3 D4 D5 D6 D7 D0 D1 D2 D3 D4 D5 D6 D7 ANALOG SIGNAL OUTPUT Slide 3 (of 13)

  4. D/A CONVERTER • D/A converter (8 Bit DAC 0800) (2) DAC0800 내부 구조 (3) DAC0800 응용회로 Slide 4 (of 13)

  5. D/A CONVERTER • D/A converter (8 Bit DAC 0800) (5) DAC 0800 응용회로 Slide 5 (of 13)

  6. D/A CONVERTER • D/A converter (8 Bit DAC 0800) ◈ DAC 0800 응용회로 Analog output Slide 6 (of 13)

  7. Sensor A/D Microcomputer Driver Data 처리 및 제어 물리계 Interface • Amp • Filter • 신호처리 • 비선형 보상 등 • Analog signal을 • digital signal로 • 변환 • 0-5V 0-5V • 0 ~ +5V • -5 ~ +5V • 0 ~ +10V • -10 ~+10V 수 mV 수mA A/D CONVERTER • ADC 원리 DIGITAL SIGNAL ANALOG SIGNAL D0 -D7 A/D CONVERTER • ADC 응용 센서 출력신호를 증폭 및 필터를 이용하여 0에서 5V 전압 신호원으로 변환 Analog signal을 digital signal로 변환 Slide 7 (of 13)

  8. A/D CONVERTER • ADC Sampling 원리 Sampled signal Sampled and Hold signal X Digit 화 Sample Hold Signal Digital signal Sampling Pulse (1) Analog signal V 0 Time domain T V (2) Sampling Pulse (sampling 속도 결정) 주기 T : ∆t Time domain T Slide 8 (of 13)

  9. A/D CONVERTER • ADC Sampling 원리 V (3) Sampled signal T Time domain V (4) Sampled and Hold signal Time domain T (5)Digit 화 0000 1000 0001 000 0010 000 Slide 9 (of 13)

  10. A/D CONVERTER • ADC 0809 architecture • ADC0808/ADC0809 8-Bit µP Compatible A/D Converters with 8-Channel • Multiplexer • Features • Easy interface to all microprocessors • adjusted voltage reference • No zero or full-scale adjust required • 8-channel multiplexer with address logic • 0V to 5V input range with single 5V power supply • Outputs meet TTL voltage level specifications • 28-pin molded chip carrier package • Key Specifications • Resolution: 8 Bits • Total Unadjusted Error: ± 1 /2 LSB and ±1 LSB • Single Supply: 5 VDC • Low Power: 15 mW • Conversion Time: 100 µs . ADC 0809 pin out Slide 10 (of 13)

  11. CLOCK START ANALOG INPUT EOC 8CHAN -NEL ANALOG MUX CONTROL & TOMING S.A.R 3-STATE OUTPUT LATCH BUFFER SWITCH ADDRESS LATCH 256 R-LADDER DIGITAL OUTPUT -Vref +Vref A/D CONVERTER • ADC 0809 architecture ◈ ADC 0809 Block Diagram Slide 11 (of 13)

  12. CLOCK START ALE ADDRE AD IN OUT ENABLE EOC OUT DATA A/D CONVERTER • ADC 0809 architecture .◈ Timing diagram .◈ SELECTED ADDRESS LINE ANALOG Slide 12 (of 13)

  13. A/D CONVERTER • ADC 0809 architecture ◈ ADC Application (ADC 0809) Slide 13 (of 13)

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