ecet_340_week_4_homework__0 - Page 324 46 For the PAC1...

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Page 324, problems 46, 48 46. For the PAC1 counter, which pin is used for the input pulse? Pin PT0 48. Program PACA to be an event counter. Use 16-bit mode, and display the binary 324325count on PORTB and PORTA continuously. Set the initial count to 20,000. PORTA = PORTA | 0x02; PORTB = PORTB & ~0x0C Page 467, review questions 1–4 1. In a DAC, input is ____digital __ (digital, analog) and output is ____analog_ (digital, analog). 2. In an ADC, input is _____ analog _ (digital, analog) and output is ___digital__ (digital, analog). 3. DAC0808 is a(n) _ 8 ___-bit D-to-A converter.
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4. (a) The output of DAC0808 is in _ current _____ (current, voltage). (b) True or false. The output of DAC0808 is ideal to drive a motor. True Page 469, problems 55–60 55. True or false. DAC0808 is the same as DAC1408. true 56. Find the number of discrete voltages provided by the n -bit DAC for the following: (a) n = 8 =( 2^n)=2^8=26 discrete voltage (b) n = 10 =( 2^n)=2^10)=1024 discrete voltage (c) n = 12 =(2^n)=(2^12)=4096 discrete voltages 57. For DAC1408, if Iref = 2 mA, show how to get an I out of 1.99 when all inputs are HIGH. Iout=I ref(D7/2^n+D6/2^n1……) Assuming ref=2mA and given that n=8 if all inputs are high then 1.99=2mA(153/2^8) =1.99=2mA(0.5977)=1.1954 approximately=1.99
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58.
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  • Spring '12
  • Digital Signal Processing, Analog-to-digital converter, Digital-to-analog converter, digital data, analog electrical signal

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