1. 14장
DAC and ADC
Slide 1 (of 13)

2. “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)

3. (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)

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

8. 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)

9. 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
Slide 9 (of 13)

10. A/D CONVERTER ADC 0809 architecture
ADC0808/ADC 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. 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)

12. 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)

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