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Dac Convert

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1. Cierto o falso: un DAC de 10 bits tendrá una resolución menor que un DAC de 12 bits para la misma salida a plena escala.

Cierto o falso: un DAC de 10 bits con salida a plena escala de 10 V tiene un porcentaje de resolución menor que un DAC de 10 bits con salida a plena escala de 12 V.

2. Un DAC de ocho bits produce un voltaje de salida de 2.0 v para un código de entrada de 01100100. ¿Cuál será el valor de Vsal para un código de entrada de 10110011?

3. Determine los factores de ponderación para cada bit de entrada del DAC en el problema 10.2

4. ¿Cuál es la resolución del DAC del problema 10.2? Exprésela en volts y como porcentaje.

5. ¿Cuál es la resolución en volts de un DAC de 10 bits cuya salida F.S es 5 V.?

6. ¿Cuántos bits se requieren para un DAC de modo que su salida F.S sea 10 mA y su resolución menor que 40 µA?

7. ¿Cuál es el porcentaje de resolución de un DAC de 3 bits y cuál es el tamaño del escalón si el valor máximo es 2 V.?

8. Un DAC de 12 bits (3 dígitos) que usa el código de entrada BCD tiene una salida a plena escala de 9.99 V. Determine el tamaño del escalón, el porcentaje de resolución y el valor de Vsal para un código de entrada de 011010010101

9. Compare el tamaño del escalón y el porcentaje de resolución de un DAC con una entrada binaria de ocho bits con los de un DAC que tiene una entrada BCD de ocho bits. Suponga un valor a plena escala de 990 mV para cada DAC.

|DAC de 8 bits con entrada binaria |DAC de 8 bits con entrada BCD |
| | |
| | |

10. Determine el factor de ponderación de cada bit para el DAC BCD del problema 10.9 ¿Cuál sería la salida si la entrada fuera 100000100011?

11. El tamaño del escalón de DAC de la figura 10.6 se puede modificar cambiando el valor de Rf. Determine el valor requerido de Rf, para un tamaño de escalón de 0.5 V. ¿Cambiará el porcentaje de resolución el nuevo valor de Rf?

12. Suponga que la salida del DAC de la figura 10.8 a) está conectada al amplificador operacional de la fig. 10.8 b). a) Con Vref = 5 V, R = 20 KΩ y Rf = 10 KΩ, determine el tamaño del escalón y el voltaje a plena escala en Vsal. b) Cambie el valor de Rf de manera que el voltaje a plena escala en Vsal sea – 2 V. c) Use el nuevo valor de Rf y determine el factor de proporcionalidad, K, en la relación Vsal = K (Vref x B)

[pic] 13. ¿Cuál es la ventaja del DAC de la figura 10.9 respecto al de la figura 10.8, en especial para un número mayor de bits de entrada?


14. Un DAC de ocho bits tiene un error a plena escala de 0.2 % F.S. Si el DAC tiene salida a plena escala de 10 mA. ¿Cuál es el error mayor para cualquier entrada digital? Si en la lectura del D/A se lee 50 µA para una entrada digital de 00000001, ¿Se encuentra dentro del intervalo de precisión especificado? (suponga que no hay error de desplazamiento)

10.19 Un DAC particular de seis bits tiene salida a plena escala clasificada a 1.260. Su precisión se especifica como ±0.1% F.S y tiene un error de desplazamiento de ±1mV. Suponga que el error de desplazamiento no se ha eliminado. Considera las mediciones hechas en este DAC (tabla 10.7) y determine cuáles no se encuentran dentro de las especificaciones del dispositivo.

|Código de entrada |Salida |
|000010 |41.5 mV |
|000111 |140.2 mV |
|001100 |242.5 mV |
|111111 |1.258 V |

10.24 Un ADC de rampa digital de ocho bits con una resolución de 40 mV usa una frecuencia de reloj de 2.5 MHz y un comparador con Vt = 1 mV. Determine los siguientes valores: a) La salida digital para VA = 6 V b) La salida digital para 6.035 V c) Los tiempos de conversión máximo y promedio para este DAC.

10.25 ¿Por qué las salidas digitales fueron las mismas para los incisos a) y b) del problema 10.24?

10.26 ¿Qué sucedería en el ADC del problema 10.24 si se aplicara un voltaje analógico de Va = 10.853 a la entrada? ¿Qué forma de onda aparecería en la salida del DAC? Incorpore la lógica necesaria en este ADC de modo que se genere un error de escala excedida cuando Va sea demasiado grande.

10.27 Un ADC tiene las siguientes características : resolución, 12 bits, error a plena escala 0.03 % F.S, salida a plena escala +5 V. a) ¿Cuál es el error de cuantización en volts? b) ¿Cuál es el error total posible en volts?

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