Digital design width CPLD Application and VHDL - Chapter 12

Interfacing Analog and Digital Circuits Mạch điện tử và các tín hiệu có thể được chia thành hai loại chính: analog và kỹ thuật số. Tín hiệu tương tự có thể thay đổi liên tục trong một phạm vi xác định. kỹ thuật số tín hiệu mất trên các giá trị cụ thể, thường được mô tả bởi một số nhị phân. Nhiều hiện tượng trong thế giới xung quanh chúng ta là tương tự trong tự nhiên. Âm thanh, ánh sáng, nhiệt độ, vị trí, vận tốc, gia tốc, thời gian, trọng lượng, và khối lượng là tất cả số lượng tương. | CHAPTER ihiiÌÍ Ịii Ềhii l ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll lll Interfacing Analog and Digital Circuits OUTLINE CHAPTER OBJECTIVES Analog and Digital Signals Digital-to-Analog Conversion Analog-to-Digital Conversion Data Acquisition Upon successful completion of this chapter you will be able to Define the terms analog and digital and give examples of each. Explain the sampling of an analog signal and the effects of sampling frequency and quantization on the quality of the converted digital signal. Draw the block diagram of a generic digital-to-analog converter DAC and circuits of a weighted resistor DAC and an R-2R ladder DAC. Calculate analog output voltages of a DAC given a reference voltage and a digital input code. Configure an MC1408 integrated circuit DAC for unipolar and bipolar output and calculate output voltage from known component values reference voltage and digital inputs. Describe important performance specifications of a digital-to-analog converter. Draw the circuit for a flash analog-to-digital converter ADC and briefly explain its operation. Define quantization error and describe its effect on the output of an ADC. Explain the basis of the successive approximation ADC draw its block diagram and briefly describe its operation. Describe the operation of an integrator with constant input voltage. Draw the block diagram of a dual slope integrating ADC and briefly explain its operation. Explain the necessity of a sample and hold circuit in an ADC and its operation. State the Nyquist sampling theorem and do simple calculations of maximum analog frequencies that can be accurately sampled by an ADC system. Describe the phenomenon of aliasing and explain how it arises and how it can be remedied. Interface an ADC0808 analog-to-digital converter to a CPLD-based state machine. Design a .