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LTC6090-5 LTC6090-5

Design Notes

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  High Voltage CMOS Amplifier Enables High Impedance Sensing with a Single IC &mdash DN513
  PDF, 107 Kb, File published: Mar 1, 2013
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  High Voltage CMOS Amplifier Enables High Impedance
  Sensing with a Single IC – Design Note 513
  Jon Munson
  Introduction
  Accurately measuring voltages requires minimizing
  the impact of the instrument connection to the tested
  circuit. Typical digital voltmeters (DVMs) use 10M
  resistor networks to keep loading effects to an inconspicuous level, but even this can introduce significant
  error, particularly in higher voltage circuits that involve
  high resistances.
  The solution is to use high impedance amplifiers in an
  electrometer configuration, so only miniscule amplifier
  input current comes from the test node. To make the
  input current the lowest possible value, field-effect
  transistors (FETs) are traditionally employed at the
  inputs of these circuits. FETs are generally low voltage
  devices, and introduce voltage offset uncertainty that
  is difficult to eliminate. Monolithic amplifiers exist that
  incorporate FET inputs, but these are often very low
  voltage devices, especially those using typical CMOS
  fabrication methods, so their utility is limited in high
  voltage applications. Enter the LTC В®6090, a CMOS amplifier that can handle over 140VP-P signal swings with
  sub-mV precision, ideally suited to tackle the problem. The LTC6090 Easily Solves High Voltage Sensing …

Articles

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  Monolithic Operational Amplifier Works from ±4.75V to ±70V and Features Rail-to-Rail Output Swing and Low Input Bias Current &mdash LT Journal
  PDF, 2.6 Mb, File published: Jan 17, 2013
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  Monolithic Operational Amplifier Works from
  В±4.75V to В±70V and Features Rail-to-Rail
  Output Swing and Low Input Bias Current
  Michael B. Anderson Monolithic operational amplifiers have been around
  since the 1960s, but this ubiquitous device still sees
  steady improvements in performance. The LTC6090
  precision monolithic operational amplifier takes a big step
  forward by extending the supply voltage to В±70V without
  compromising the features that are expected in a precision
  op amp. The LTC6090 is available in a small 8-lead SO
  package and a 16-lead TSSOP package. Both packages
  feature exposed pads to reduce thermal resistance,
  eliminating the need for a heat sink. An easy interface
  to low voltage control lines and built-in thermal safety
  features simplify the task of high voltage analog design. Operational amplifiers are expected to
  have low input bias current, low offset,
  and low noise. The LTC6090 is no exception. Designed with a MOS input stage the
  input bias current is typically 3pA at 25В°C
  and less than 100pA at 85В°C. This makes
  it well suited for high impedance applications such as a photodiode amplifier Figure 2. LTC6090 output voltage 140VP–P 10kHz sine
  wave OUTPUT VOLTAGE SWING (V) V+ – 0.8
  V+ – 1.0
  V+ – 1.2 …

Model Line

Manufacturer's Classification

• Signal Conditioning > Amplifiers > Operational Amplifiers (Op Amps) > Low Bias Current Amplifiers (Ib < 100pA) | High Voltage Amplifiers (>12V) | Rail-to-Rail Amplifiers
• Space & Harsh Environment > Extended Temperature Plastic (H & MP) > Extended Temperature (H & MP) Amplifiers

Other Names:

LTC6090HFETRPBF, LTC6090HFE TRPBF