4-DAC dan ADC

DIGITAL TO ANALOG CONVERSION (DAC)&ANALOG TO DIGITAL CONVERSION (ADC)

Rusminto Tjatur Widodo

Source: Digital Systems, Principle and Applications, 9th Edition, Ronald J. Tocci, Neal S. Widmer and Gregory L. Moss, Prentice Hall, 2004

DIGITAL TO ANALOG CONVERSION (DAC)

To control physical variable

Source: Digital Systems, Principle and Applications, 9th Edition, Ronald J. Tocci, Neal S. Widmer and Gregory L. Moss, Prentice

Hall, 2004

1. Summing Amplifier

Hall, 2004

2. R/2R Ladder

Hall, 2004

Misalkan input biner DAC = 1100, maka Vo

N= Jumlah Bitn= bit yang ke-n

1. DAC seperti pada gambar di atas (R/2R Ladder 4 bit) mempunyai Vref = 5V, Berapakah

a. Resolusi dari DAC

b. Tegangan skala penuh DAC

2. Jika DAC R/2R mempunyai input 8 bit, berapakah

a. Resolusi dari DAC

b. Tegangan skala penuh DAC

c. Jika ingin didapatkan Vo=1 V, berapakah input digital yang harus diberikan? 0001 1010 (26)dec

a. Rancanglah DAC dengan summing amplifier 8 bit, dengan ketentuan resolusi yang dihasilkan adalah 0.1 V,

b. hitunglah tegangan pada skala penuhnya.

c. Berapakah tegangan outputnya jika input digitalnya adalah ADh.

Hall, 2004

ANALOG TO DIGITAL CONVERSION (ADC)

ADC (Analog to Digital Conversion)

Hall, 2004

1. DIGITAL RAMP

tc = jmlh step x TT = 1/fSource: Digital Systems, Principle and Applications, 9th Edition,

Ronald J. Tocci, Neal S. Widmer and Gregory L. Moss, Prentice Hall, 2004

1. ADC – Digital Ramp

Hall, 2004

ADC 10 bit, mempunyai f clock = 1 Mhz, VT = 1 mV, DAC mempunyai VFS= 10,23 V dan input 10 bit.

a. Nilai Digital yang dihasilkan jika VA=3,728 V

b. Waktu konversi yang diperlukan (tc)c. Berapakah perkiraan input analognya

jika output digitalnya 01011 10101

Hall, 2004

ADC mempunyai f clock = 2 Mhz, VT = 1 mV, DAC mempunyai teg. Full-scale VFS= 15 V dan input 8bit.

a. Nilai Digital (dalam biner) yang dihasilkan jika VA=7,581 V

b. Waktu konversi yang diperlukan (tC)

c. Berapakah perkiraan input analognya jika output digitalnya BCh

Hall, 2004

2. SUCCESSIVE APPROXIMATION ADC (SAC)

tC = jmlh bit x TT = 1/f

Hall, 2004

TugasJelaskan cara kerja ADC SAC

2. Successive Approximation

Sebuah ADC tipe SAC 8 bit mempunyai resolusi 20 mV.

a. Hitunglah output digitalnya jika diberi input analog 2,17 V. [108 desimal = 0110 1100]

b. Hitunglah waktu conversi (tc) jika f clock= 1Mhz. [untuk SAC, tC = N x 1cycle clock. Jadi tC = 8 micro secon]

c. Berapa kali lebih cepat waktu konversi ADC tipe SAC ini Jika menggunakan ADC Digital Ramp

Hall, 2004

3. ADC- Flash

4-DAC dan ADC

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