14장 DAC and ADC Slide 1 (of 13).

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Presentation transcript:

14장 DAC and ADC Slide 1 (of 13)

“DA, AD converter” 에 대해 알아보겠습니다. 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 Slide 2 (of 13)

(1) D/A (Digital to Analog converter) 구조 D/A CONVERTER D/A CONVERTER 개요 (1) D/A (Digital to Analog converter) 구조 DIGTAL signal ANALOG 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)

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

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

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

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

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

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

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)

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

A/D CONVERTER ADC 0809 architecture .◈ SELECTED ADDRESS LINE ANALOG .◈ Timing diagram CLOCK START ALE ADDRE AD IN OUT ENABLE EOC OUT DATA Channel C B A IN0 L IN1 H IN2 IN3 IN4 IN5 IN6 IN7 Slide 12 (of 13)

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