Archive for the ‘op amp’ category

AD820 Datasheet – Rail to Rail Op Amp

February 20th, 2011

AD820 Single-Supply, Rail-to-Rail, Low Power, FET Input Op Amp

AD820 General Description

The AD820 is a precision, low power FET input op amp that can operate from a single supply of 5 V to 36 V, or dual supplies of ±2.5 V to ±18 V. It has true single-supply capability, with an input voltage range extending below the negative rail, allowing the AD820 to accommodate input signals below ground in the single-supply mode. Output voltage swing extends to within 10 mV of each rail, providing the maximum output dynamic range.
Offset voltage of 800 μV maximum, offset voltage drift of 2 μV/°C, typical input bias currents below 25 pA, and low input voltage noise provide dc precision with source impedances up to 1 GΩ. 1.8 MHz unity gain bandwidth, −93 dB THD at 10 kHz, and 3 V/μs slew rate are provided for a low supply current of 800 μA. The AD820 drives up to 350 pF of direct capacitive load and provides a minimum output current of 15 mA. This allows the amplifier to handle a wide range of load conditions. This combination of ac and dc performance, plus the outstanding load drive capability, results in an exceptionally versatile amplifier for the single-supply user. » Read more: AD820 Datasheet – Rail to Rail Op Amp

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LMC7111 – Tiny CMOS Rail to Rail Op Amp

February 7th, 2011

LMC7111 – Tiny CMOS Operational Amplifier with Rail-to-Rail Input and Output

LMC7111 General Description

The LMC7111 is a micropower CMOS operational amplifier available in the space saving SOT 23-5 package. This makes the LMC7111 ideal for space and weight critical designs. The wide common-mode input range makes it easy to design battery monitoring circuits which sense signals above the V+ supply. The main benefits of the Tiny package are most apparent in small portable electronic devices, such as mobile phones, pagers, and portable computers. The tiny amplifiers can be placed on a board where they are needed, simplifying board layout. » Read more: LMC7111 – Tiny CMOS Rail to Rail Op Amp

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LMC8101 Datasheet: Rail to Rail Op Amp

January 30th, 2011

LMC8101: Rail-to-Rail Input and Output, 2.7V Op Amp in micro SMD package with Shutdown

LMC8101 General Description

The LMC8101 is a Rail-to-Rail Input and Output high performance CMOS operational amplifier. The LMC8101 is ideal for low voltage (2.7V to 10V) applications requiring Rail-to-Rail inputs and output. The LMC8101 is supplied in the die sized micro SMD as well as the 8 pin MSOP packages. The micro SMD package requires 75% less board space as compared to the SOT23-5 package. The LMC8101 is an upgrade to the industry standard LMC7101. » Read more: LMC8101 Datasheet: Rail to Rail Op Amp

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MCP6281/2/3/4/5 Datasheet: Rail to Rail Op Amp

January 30th, 2011

MCP6281/2/3/4/5 450 μA, 5 MHz Rail to Rail Op Amp

MCP6281/2/3/4/5 General Description

The Microchip Technology Inc. MCP6281/2/3/4/5 family of operational amplifiers (op amps) provide wide bandwidth for the current. This family has a 5 MHz Gain Bandwidth Product (GBWP) and a 65° phase margin. This family also operates from a single supply voltage as low as 2.2V, while drawing 450 μA (typ.) quiescent current. Additionally, the MCP6281/2/3/4/5 supports rail-to-rail input and output swing, with a common mode input voltage range of VDD + 300 mV to VSS – 300 mV. This family of operational amplifiers is designed with Microchip’s advanced CMOS process.

The MCP6285 has a Chip Select (CS) input for dual op amps in an 8-pin package. This device is manufactured by cascading the two op amps (the output of op amp A connected to the non-inverting input of op amp B). The CS input puts the device in Low-power mode.

The MCP6281/2/3/4/5 family operates over the Extended Temperature Range of -40°C to +125°C. It also has a power supply range of 2.2V to 5.5V.

MCP6281/2/3/4/5 Rail to Rail Op Amp Features

  • Gain Bandwidth Product: 5 MHz (typ.)
  • Supply Current: IQ = 450 μA (typ.)
  • Supply Voltage: 2.2V to 5.5V
  • Rail-to-Rail Input/Output
  • Extended Temperature Range: -40°C to +125°C
  • Available in Single, Dual and Quad Packages
  • Single with Chip Select (CS) (MCP6283)
  • Dual with Chip Select (CS) (MCP6285)

MCP6281/2/3/4/5 Rail to Rail Op Amp Pin Connection Diagram

 

MCP6281/2/3/4/5 Rail to Rail Op Amp Pin Connection Diagram
MCP6281/2/3/4/5 Pin Connection Diagram

 

MCP6281/2/3/4/5 Rail to Rail Op Amp Typical Electronic Circuit Application

 

MCP6281/2/3/4/5 Rail to Rail Op Amp Electronic Circuit Application - Shallen-key High-Pass Filter
MCP6281/2/3/4/5 Shallen-key High-Pass Filter

 

MCP6281/2/3/4/5 Rail to Rail Op Amp Datasheet Download

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AD822 Datasheet: Single Supply; Rail to Rail Op Amp

January 30th, 2011

AD822: Single-Supply, Rail-to-Rail Low Power FET-Input Op Amp

AD822 Op Amp General Description

The AD822 is a dual precision, low power FET input op amp that can operate from a single supply of 5 V to 30 V or dual supplies of ±2.5 V to ±15 V. It has true single-supply capability with an input voltage range extending below the negative rail, allowing the AD822 to accommodate input signals below ground in the single-supply mode. Output voltage swing extends to within 10 mV of each rail, providing the maximum output dynamic range. » Read more: AD822 Datasheet: Single Supply; Rail to Rail Op Amp

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LM108 / LM108AQML Datasheet

January 13th, 2011

LM108 / LM108AQML Operational Amplifier

General Description

The LM108 is a precision operational amplifier having specifications a factor of ten better than FET amplifiers over a −55°C to +125°C temperature range. The devices operate with supply voltages from ±2V to ±20V and have sufficient supply rejection to use unregulated supplies.

Although the circuit is interchangeable with, and uses the same compensation as the LM101A, an alternate  compensation scheme can be used to make it particularly insensitive to power supply noise and to make supply bypass capacitors unnecessary.

» Read more: LM108 / LM108AQML Datasheet

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LM101A/LM201A/LM301A Datasheet

January 12th, 2011

LM101A/LM201A/LM301A Operational Amplifier

General Description

The LM101A series are general purpose operational amplifiers which feature improved performance over industry standards like the LM709. Advanced processing techniques make possible an order of magnitude reduction in input
currents, and a redesign of the biasing circuitry reduces the temperature drift of input current.

Improved specifications include:

  • Offset voltage 3 mV maximum over temperature (LM101A/LM201A)
  • Input current 100 nA maximum over temperature (LM101A/LM201A)
  • Offset current 20 nA maximum over temperature (LM101A/LM201A)
  • Guaranteed drift characteristics
  • Offsets guaranteed over entire common mode and supply voltage ranges
  • Slew rate of 10V/μs as a summing amplifier » Read more: LM101A/LM201A/LM301A Datasheet

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LM194/LM394 Datasheet

December 22nd, 2010

LM194/LM394 Supermatch Pair NPN Transistor

LM194/LM394 General Description:

The LM194 and LM394 are junction isolated ultra well matched monolithic NPN transistor pairs with an order of magnitude improvement in matching over conventional transistor pairs. This was accomplished by advanced linear processing and a unique new device structure.
Electrical characteristics of these devices such as drift versus initial offset voltage, noise, and the exponential relationship of base-emitter voltage to collector current closely approach those of a theoretical transistor. Extrinsic emitter and base resistances are much lower than presently available pairs, either monolithic or discrete, giving extremely low noise and theoretical operation over a wide current range.
Most parameters are guaranteed over a current range of 1 mA to 1 mA and 0V up to 40V collector-base voltage, ensuring superior performance in nearly all applications. To guarantee long term stability of matching parameters, internal clamp diodes have been added across the emitter base junction of each transistor. These prevent degradation due to reverse biased emitter currentÐthe most common cause of field failures in matched devices. The parasitic  isolation junction formed by the diodes also clamps the substrate region to the most negative emitter to ensure complete isolation between devices.
The LM194 and LM394 will provide a considerable improvement in performance in most applications requiring a closely matched transistor pair. In many cases, trimming can be eliminated entirely, improving reliability and  decreasing costs. Additionally, the low noise and high gain make this device attractive even where matching is not critical.
» Read more: LM194/LM394 Datasheet

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Op amp : Why do we still need to learn it?

December 10th, 2009

When I was introduced to the Operational Amplifiers & Linear Integrated Circuits course back at the university, my first question is:  “Do we really need to learn this subject?” I mean the time is moving and nowadays more and more digital equipments, NOT the  analog one, are being produced. I rarely see any analog radio, tape, TV, etc anymore. Most of them are replaced by their digital brother.  Digital offers better performance, smaller size and almost unlimited development.

So, why do we need Op amp and their family? I just couldn’t understand why. I imagined like traveling to the past to the analog age, then to the middle age, to the bronze age, to the stone age, to the dinosaur age, ups that’s too far :) . Anyhow, you know what I mean. Does it even worth to learn at all?

» Read more: Op amp : Why do we still need to learn it?

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