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Design Notes

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  High Performance Op Amps Deliver Precision Waveform Synthesis &mdash DN306
  PDF, 86 Kb, File published: Mar 2, 2003
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  High Performance Op Amps Deliver Precision Waveform
  Synthesis – Design Note 306
  Jon Munson
  Introduction
  With the trend toward ever more precise waveform
  generation using DSP synthesis and digital-to-analog
  conversion, such as with the LTCВ®1668 16-bit, 50Msps
  DAC, increasing demands are being placed on the output
  amplifier. In some applications, the DAC current-tovoltage function is simply resistive, though this is limited
  to small-signal situations. The more common solution
  is to use an amplification or a transimpedance stage
  to provide larger usable scale factors or level shifting.
  Figure 1 shows one such example, with an LTВ®1722
  performing a differential-current to single-ended voltage amplification for an LTC1668.
  The LT1722, LT1723 and LT1724 Low Noise
  Amplifiers
  The LT1722, LT1723 and LT1724 are single, dual and
  quadruple operational amplifiers that feature low noise
  and high speed along with miserly power consumption.
  The parts are optimized for low voltage operation and
  draw only 3.7mA (typical) per section from В±5V supplies,
  yet deliver up to 200MHz GBW and quiet 3.8nV/в€љHz, 1.2pA/в€љHz (typical) noise performance. DC characteristics include sub-millivolt input offset precision and
  output drive greater than 20mA, excellent for cable …

Articles

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  High Performance Op Amps Deliver Precision Waveform Synthesis &mdash LT Journal
  PDF, 148 Kb, File published: Aug 9, 2004
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  DESIGN IDEAS High Performance Op Amps Deliver
  Precision Waveform Synthesis
  by Jon Munson
  Introduction
  With the trend toward ever more precise waveform generation using DSP
  synthesis and digital-to-analog conversion, such as with the LTC1668
  16-bit, 50Msps DAC, increasing demands are being placed on the output
  amplifier. In some applications, the
  DAC current-to-voltage function is
  simply resistive, though this is limited to small-signal situations. The
  more common solution is to use an
  amplification or a transimpedance
  stage to provide larger usable scale
  factors or level shifting. Figure 1 shows
  one such example, with an LT1722
  performing a differential-current to
  single-ended-voltage amplification for
  an LTC1668. 18pF 1k 49.9Ω 5V 0.1µF 49.9Ω IOUTA 20 200Ω IOUTB 200Ω
  19 IFS = 5mA 18pF 1 LT1722
  2 1k
  –5V consumption. The parts are optimized
  for low voltage operation and draw
  only 3.7mA (typical) per section from …

Model Line

Manufacturer's Classification

• Signal Conditioning > Amplifiers > Operational Amplifiers (Op Amps) > High Speed Amplifiers (GBW > 50MHz) | Low Noise Amplifiers ( | High Voltage Amplifiers (>12V)

Other Names:

LT1723IS8PBF, LT1723IS8 PBF