48351. A simultaneous A/D converter is also known as a(n) ________ A/D converter.
48352. The primary disadvantage of the simultaneous A/D converter is:
48353. What is the output voltage for the circuit shown below?
48354. Three characteristics of op amps make them almost ideal amplifiers: very high input impedance, very low impedance, and ________.
48355. Sample-and-hold circuits in A/D converters are designed to:
48356. What is the main disadvantage of the counter-ramp A/D converter?
48357. Why is a binary-weighted DAC usually limited to 4-bit binary conversion?
48358. The co-operative which serve the members other than by providing credit is called:
48359. What is gain error in a DAC?
48360. An actuator is usually a device that:
48361. The DAC0808 and the MC1408 are very popular and inexpensive 8-bit D/A converters.
48362. The delay between a change on the digital input of a DAC and the appearance of the change on the output is called settling time.
48363. The main advantage of the SAR ADC method is its high speed.
48364. One way to determine the resolution of a DAC is to calculate the ratio of one step voltage to the maximum output voltage.
48365. The output voltage or current of a digital-to-analog converter is truly an analog signal.
48366. The amount of deviation of the measured step size from the ideal step size is a measure of linearity.
48367. When analog inputs from several sources are to be converted, a multiplexing technique can be used so that one ADC may be time-shared.
48368. An AD7524 is an eight-bit D/A converter that uses an R/2R ladder network.
48369. Voltage-to-frequency ADC is more complicated than other ADCs.
48370. Two characteristics of ideal operational amplifiers are very high input impedance and very high voltage gain.
48371. Electrical quantities can be interpreted without conditioning by a digital computer.
48372. It is possible to develop more than 16 different analog levels using 4-bit resolution.
48373. A simultaneous, multiple comparator, or flash converter uses parallel encoding.
48374. A DAC is monotonic if its output increases as its binary input is incremented from one value to the next.
48375. An operational amplifier is used as a comparator.
48376. Resolution in the analog output of a DAC is primarily dependent on the number of input binary bits.
48377. The primary disadvantage of the flash A/D converter is the large number of comparators required.
48378. A summing op-amp can be used for DAC.
48379. A data acquisition system may communicate via two common buses: the data bus and the control bus.
48380. The time required to complete a conversion cycle is called conversion time.
48381. Generally speaking, DACs with a current output will have a shorter settling time than those with voltage outputs.
48382. A D/A converter changes things such as temperature variations into digital quantities.
48383. If the least significant bit (LSB) of a four-bit binary-weighted resistor D/A converter connects to a 200 resistor, then the resistor needed for the next bit is 100 .
48384. Flash A/D converters depend on an input clock pulse to perform each conversion.
48385. Linearity error is the maximum deviation in step size from the ideal step size.
48386. One form of a sigma/delta modulator circuit is designed to convert a continuous analog signal into a modulated bit stream (A/D).
48387. In a binary-weighted D/A converter the sum of all the currents from the binary weighted resistors flows through the operational amplifier.
48388. An eight-bit D/A converter has a resolution of 0.125.
48389. 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.
48390. D/A conversion is the process of taking a voltage or current and converting it to a digital code.
48391. A sample-and-hold circuit is used in D/A conversion.
48392. The output of an analog-to-digital converter is a voltage level.
48393. A CD player probably uses a sigma/delta D/A converter.
48394. When the inputs of a four-bit D/A converter are connected to a binary up-counter, the output looks like an upward sloping line.
48395. The current across the MSB "rung" of a 4-bit R/2R ladder DAC if the reference voltage is 5 v and R is 8 is 625 A.
48396. When the analog input to a tracking A/D converter is at a constant level, the digital output will oscillate.
48397. To be useful, A/D or D/A converters must have meaningful representation of the analog quantity and a digital representation and the digital quantity as an analog representation.
48398. A light bulb and a switch are examples of an analog circuit.
48399. When a DAC output shows a deviation of the measured step size from the ideal step size, this error is called nonlinearity.
48400. In a digital storage scope, when memory is full, the next data point is lost.