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ANALOG AND ANALOG CONVERSION

ANALOG vs. DIGITAL

牋牋牋      An analog signal is one in which a base carrier’s alternating current frequency I is modified so that additional information can be included in the signal. An analog chip connects digital signal processors (DSPs) by converting continuous signals to discrete digital numbers. It is often an analog-to-digital converter that does this.
      An analog-to-digital converter (ADC), also known as an analog-to-digital IC, converts an analog input signal into a proportional digital output that is read by a microprocessor (or DSP) and then processed.
      There are several different types of analog-to-digital converters. The most common types are Flash, Successive approximation converter, and Sigma-Delta.
      Using comparators and a string of resistors, the Flash analog-to-digital converter is the fastest type available.
      A Successive approximation analog-to-digital converter also uses a comparator as well as counting logic to convert analog to digital.
      Lastly, the Sigma-Delta analog-to-digital converter is the slowest analog-to-digital converter currently on the market.

COMPARATOR

牋牋牋 A comparator is very similar to an Op Amp. In addition to not having the feedback resistor, the comparator circuit is different in the sense that the op amp comparator is used to compare two voltages and produce a signal to indicate which voltage is greater.

OPERATIONAL AMPLIFIERS

牋牋牋 An operational amplifier is a frequently used type of analog IC used in audio and voltage amplifiers as well as analog computing systems. The most widely used type of analog IC, the op amp invariably has two inputs marked with a positive (+) sign and a negative (-) sign. The function of the Op Amp is to serve as a differential amplifier that amplifies the difference between two inputs. This is usually executed via a feedback resistor. The word operational comes from when initially op amps were used in analog computers to perform mathematical operations such as addition or subtraction.

LCD DISPLAY CONTROLLER

牋牋牋 Use of a LCD (liquid crystal display) controller has become the standard in cell phone technology today. The LCD controller converts the display data to voltage volume, creating the cutting edge graphic displays prevalent on cell phones today. The LCD controller, also commonly referred to as a LCD driver is also known as a driver IC.

MULTIPLEXERS

牋牋牋 Analog mulitplexers have sets of switches that connect several analog inputs to a common analog output. This then allows a analog-to-digital converter (ADC) to receive data from multiple inputs.

SENSORS

牋牋牋 There are two different types of sensors, digital sensors and analog sensors. Analog sensors are capable of converting a physical property (temperature) to a proportional analog electrical signal (such as current, charge or voltage). Analog sensors produce an output signal that is directly proportional to the input signal and is continuous in both magnitude and in time. Other physical properties such as pressure, force or acceleration can be converted to a proportional analog electrical signal.

Aerolocator.com has sellers who have inventory from some of the analog components described above. Some of the manufacturers include:

Advanced Analogic Technologies Incorporated
Advanced Linear Devices
Advanced Monolithic Systems, Inc.
Allegro Microsystems, Inc.
AMIS Holdings, Inc.
Amplifonix
Analog Devices, Inc.
Arizona Microtek, Inc.
California Micro Devices Corporation
Calogic, LLC
Catalyst Semiconductor, Inc.
Celeritek
Cirrus Logic, Inc.
Exar Corporation
Fairchild Semiconductor Corp.
Freescale Semiconductor, Inc.
Frequency Devices
FyreStorm Inc.
Impinj, Inc.
Integration Associates Inc.
International Rectifier Corporation
Intersil Corporation
IXYS Corporation
Kenet Inc.
Lattice Semiconductor Corporation
Linear Technology Corporation
Marvell Technology Group Ltd.
Maxwell Technologies Inc.
Maxim Integrated Products
Micrel Semiconductor
Micro Linear Corporation
Micro Networks Integrated Products
Micrpchip Technology Incorporation
Micropac Industies Inc.
Microsemi Corporation
M.S. Kennedy Corporation
Monolithic Power Systems, Inc.
National Semiconductor Corporation
National Semiconductor (UK) Ltd..
NEC
NJR Corporation
ON Semiductor Corporation
Philips Semiconductors
Power Integrations, Inc.
PowerDsine Ltd.
Renesas Technology Corp.
ROHM
STMicroelectronics
Semtech Corporation
Silicon Laboratories Inc.
Siliconix incorporated
Sipex Corporation
SRS Labs, Inc.
STMicroelectronics N.V.
Supertex, Inc.
TelCom Semiconductor Inc.
Texas Instruments
TOREX Semiconductor Ltd.
Transys Electronics
TriQuint Semiconductor
Vishay Inertechnology, Inc.
Vishay Siliconix
Volterra Semiconductor Corporation
Zarlink Semiconductors
Zetex

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