Other Semiconductor Products  


Aside from these products on the home page: Logic Gates; Flip-flops/Latches; Shift Registers; Digital Counters; Encoders/Decoders; SRAMs; DRAMs; EPROMs; Flash Memory; Microprocessors; Op Amps; In Amps; DAC's; ADC's; DSP's; Voltage Regulators; Analog Switches; Power Management IC's; Optocouplers/Isolators; Waveform Generators; PLL IC's; Accelerometers; CCD's; Motor Controllers; ASIC's,  other semiconductor products include the following.


Digital Buffers/Transceivers are digital IC's that serve as an interface between the digital output of one circuit and the digital input of another circuit for one reason or another: 1) to 'gate' digital signals that share a common bus and prevent data clashes; 2) to 'condition' a weak digital signal to the correct digital voltage level; 3) to increase the fan-out of an output; 4) to transmit digital data between two digital circuits that employ different voltage levels (e.g., CMOS vs. TTL); etc.  


Schmitt Triggers are comparator devices whose output exhibits hysteresis, i.e., the input threshold level at which its output changes from 'low' to 'high' is higher than the input threshold level at which its output changes from 'high' to 'low.'  Due to these two different threshold levels of inputs at which the output of a Schmitt trigger changes, rapid back-and-forth output switching observed in an ordinary comparator circuit when its input is very close to its single threshold is not observed in a Schmitt trigger.  A Schmitt trigger is therefore commonly used as an input circuit that improves noise immunity.


Voltage-Frequency (V-F) Converters are devices that convert an analog voltage (or current) into frequency, i.e., they output a train of pulses or a square wave whose frequency is proportional to the voltage present at the input.  V-F converters, or VFC's, usually consist of an input amplifier, an oscillator system of high precision, and a high-current output circuit.  The VFC output tracks the input signal and responds to its changes directly, and can provide full-scale frequencies of one or more MHz.


Frequency-to-Voltage (F-V) Converters are devices that convert frequency into voltage, i.e., they output an analog voltage or current that's proportional to the frequency of the signal at the input.  F-V converters, or FVC's, can accept a wide variety of periodic signals.  An FVC may consist of an integrator for its input circuit, whose output serves as the input to a comparator.  Every time the integrator output reaches the comparator threshold, the output of the comparator: 1) resets the integrator and 2) triggers a one-shot or monostable multivibrator which generates the pulse. A higher input voltage to the integrator causes the threshold of the comparator to be reached more quickly, resulting in a higher frequency at which the pulses are generated.  


Sample-and-Hold Amplifiers, or SHA's, are devices that, upon the command of a logic control signal, sample an input analog signal and hold the instantaneous value of the sampled signal for subsequent conversion or processing.  SHA's, which are primarily used in data acquisition systems, are basically analog memory devices that consists of an input amplifier or buffer, an energy storage device (a capacitor), an output amplifier, and switching circuits.


Energy Meters are devices that can measure the energy consumption of an external circuit. Energy meter IC's facilitate the sampling of the voltage across and the current through a circuit, as well as the conversion of these sampled quantities into digital data. These data are then used by an on-chip processor to compute the product of the digitized voltage and current signals, which is proportional to the instantaneous power of the metered circuit. The 'power' data collected over time translate to the energy consumed by the circuit.  Calibration ensures that the outputs of these energy metering IC's provide accurate readings of energy consumption.




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