CH9&14 digital
The _______________ flip-flop is also called a delay flip-flop.
D
A system that contains both digital and analog could be called
a hybrid system
A D/A converter consists of two sections a(n) _______________ network and a summing amplifier.
resistor
In a ramp A/D converter, the ramp generator produces what type of waveform?
sawtooth
A converter that cuts down on conversion time is a _______________ A/D converter.
successive-approximation
Which type A/D converter is the fastest unit?
successive-approximation
Which of these is an example of a transducer?
temperature sensors
A thermistor is a _______________ resistor.
temperature-sensitive
A 3-bit shift register has
three places to store data
Which of the following is not a common manufacturer specification of an A/D converter?
type of input
Op amps are characterized by high input impedance, low output impedance, and a variable voltage gain that is set
with external resistors
A D flip-flop transfers the data from input D to output Q after a delay of two clock pulses.
False
A multiplexer is a group of memory cells grouped together and considered a single unit.
False
A transistor is a device that converts one form of energy to another.
False
Digital circuits are advanced and rarely have redundant circuitry.
False
Digital-to-analog converters consist of a resistor network and a difference amplifier.
False
Few digital systems have analog inputs that vary continuously between two voltage levels.
False
In a ramp A/D converter, the sawtooth generator produces a sawtooth waveform.
False
The 74194 IC can shift in only one direction.
False
A ring counter is a shift register with ____________.
added circuitry
A typical example of a shift register at work is found within a
calculator
Shift registers are commonly wired using sequential devices called
flip-flops
Shift registers are constructed by wiring
flip-flops together
Which of the following is not analog in nature?
on-off switching
Which of the following is a disadvantage of a serial load shift register?
only one bit of information can be entered at a time
The 74194 IC may be described as what type of shift register?
parallel load (4-bit bidirectional)
Which of the following is another name for a photocell?
photoresistor
Which of the following is not a type of A/D converter?
ramp-approximation
This is the block diagram for an elementary 4-bit
ramp-type A/D converter
Parallel load shift registers can incorporate a(n) _______________ feature so that data will not be lost.
recirculating
Digital circuits that repeat over and over and can be used to compare readings are known as
redundant circuitry
If the light intensity on the photocell is reduced, which of the following results?
resistance of the photocell increases
If a parallel-in parallel-out shift register contains eight flip-flops, how many clock pulses are required to synchronously broadside load an 8-bit word?
1
The ADC0804 A/D converter IC has a resolution of
8 bits
Which of the following is NOT true?
A register is a group of flip-flops grouped together and considered a single unit.
The resolution of a(n) _______________ converter is given as the number of bits at the output for a binary-type unit.
A/D
The 555 timer IC can operate as a(n) _______________ multivibrator.
Astable=free running
Small-scale integrated digital voltmeter chips include all the active devices on a single CMOS IC.
False
The 74194 IC is an 8-bit unidirectional universal shift register.
False
The 74194 IC is not a very adaptable shift register.
False
The D flip-flop transfers the data from an input to the output with no delay.
False
The D/A converter converts analog information to digital data.
False
The gain of an op amp is easily set by the ratio of the input and load resistors.
False
Two 4-bit 74194 IC registers can be cascaded to make a 16-bit shift register.
False
When light strikes a cadmium sulfide photocell its resistance increases.
False
A buffer register is one that can be used to temporarily store data while they are waiting to be used by a printer.
True
A ramp generator always produces a saw tooth output waveform.
True
A ring counter can be used to cause properly connected LEDs to light, one at a time, in sequence.
True
A summing amplifier typically uses an IC unit called an operational amplifier.
True
A typical application for an A/D converter is in a digital voltmeter.
True
A voltage comparator compares several voltages and determines which is the largest.
True
Devices other than an A/D converter might also be used to convert an analog temperature to a digital form.
True
Flip-flops have a memory characteristic.
True
It would take four steps to serially load 0111 into the serial-load shift register.
True
J-K flip-flops and clocked R-S flip-flops are also used to wire shift registers.
True
Most real-world information is analog.
True
One disadvantage of a serial load shift register is that it permits only one bit of information to be entered at a time.
True
Shift registers are constructed by wiring flip-flops together.
True
The D/A converter can convert, for example, a 4-bit binary word at the input into an analog voltage.
True
The first steps in troubleshooting a simple shift register should include a good visual checking for obvious mechanical and temperature problems.
True
The gain of the operational amplifier is easily set by the ratio of the input and feedback resistors.
True
The heart of a voltage comparator is an operational amplifier.
True
The memory and shifting characteristics make the shift register extremely valuable in most digital electronic systems.
True
The memory characteristic of a flip-flop is put to use in shift registers.
True
The resolution of an A/D converter is given as the number of bits at the output for a binary-type unit.
True
The term latch may be used to describe the register used to store data.
True
Two 74194 IC shift registers can be connected to form an 8-bit parallel load shift-right register.
True
A ________ register is a specific use of a storage device that holds data that are waiting to be transferred.
buffer
The time it takes for the A/D IC to convert the analog input voltage to binary (or decimal) data at the outputs is called the
conversion time
An interface is a device or circuit that _______________ from one mode of operation to another.
converts
As the temperature of the thermistor increases, its resistance will __________.
decrease
To convert an analog measurement into digital units or digital pulses is to
digitize
How many clock pulses would it take to serially load the 74HC164 shift register with an 8-bit word?
eight
A register used to store an 8-bit word would probably contain
eight D flip-flops
An analog-to-digital converter is a special type of _____________.
encoder
An advantage of the ramp-type A/D converter is its speed in counting up to higher voltages.
false
Which of these is not one of the four categories of shift registers?
holding register
A ring counter
is a shift register with added circuitry
What term can be used to describe the register used to store data?
latch
Which of the following could aid in the troubleshooting of a shift register?
logic probe