Interfacing to the Analog World Questions

• If the least significant bit (LSB) of a four-bit binary-weighted resistor D/A converter connects to a 200 Ω resistor, then the resistor needed for the next bit is 100 Ω.
• It is possible to develop more than 16 different analog levels using 4-bit resolution.
• Generally speaking, DACs with a current output will have a shorter settling time than those with voltage outputs.
• D/A conversion is the process of taking a voltage or current and converting it to a digital code.
• Linearity error is the maximum deviation in step size from the ideal step size.
• The DAC0808 and the MC1408 are very popular and inexpensive 8-bit D/A converters.
• The primary disadvantage of the flash A/D converter is the large number of comparators required.
• A simultaneous, multiple comparator, or flash converter uses parallel encoding.
• A CD player probably uses a sigma/delta D/A converter.
• One way to determine the resolution of a DAC is to calculate the ratio of one step voltage to the maximum output voltage.
• A light bulb and a switch are examples of an analog circuit.
• A summing op-amp can be used for DAC.
• Voltage-to-frequency ADC is more complicated than other ADCs.
• One form of a sigma/delta modulator circuit is designed to convert a continuous analog signal into a modulated bit stream (A/D).
• Flash A/D converters depend on an input clock pulse to perform each conversion.
• The time required to complete a conversion cycle is called conversion time.
• An operational amplifier is used as a comparator.
• In a counter-ramp A/D converter, the end-of-conversion line must be tied back to the clear input of the counter to change the circuit to perform continuous conversions.
• When analog inputs from several sources are to be converted, a multiplexing technique can be used so that one ADC may be time-shared.
• A D/A converter changes things such as temperature variations into digital quantities.