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Notas de Diseño

• Descargar
  High Frequency Active Antialiasing Filters &mdash DN313
  PDF, 161 Kb, Archivo publicado: jun 1, 2003
  Extracto del documento

  High Frequency Active Antialiasing Filters – Design Note 313
  Philip Karantzalis
  Introduction
  High frequency (1MHz or higher) active lowpass filters
  are now practical alternatives to passive LC filters mainly
  due to the availability of very high bandwidth (100MHz or
  higher) integrated amplifiers. Analog signal filtering applications with bandwidths in the megahertz region can
  be implemented by a discrete active filter circuit using
  resistors, capacitors and a 400MHz operational amplifier
  such as the LTВ®1819 or the LT6600-10, a fully integrated
  lowpass filter. The LT6600-10 has a fixed 10MHz frequency
  response equivalent to a fourth order flat passband Chebyshev function. An LT1819-based active RC lowpass
  filter can be designed to have a Chebyshev, Butterworth,
  Bessel or custom frequency response (up to 20MHz).
  The LT6600-10 Lowpass Filter
  The LT6600-10 is a fully integrated, differential, fourth
  order lowpass filter in a surface mount SO-8 package
  (Figure 1). Two external resistors ranging from 1600О© to
  100Ω set the differential gain in the filter’s passband from
  –12dB to 12dB, respectively. The LT6600-10 passband
  gain ripple is a maximum of 0.7dB to –0.3dB up to 10MHz
  and attenuation is typically 28dB at 30MHz and 44dB at
  50MHz. The signal to noise ratio (SNR) at the filter’s output …

Artículos

• Descargar
  A 14-Bit ADC that is Both Fast and Low Noise &mdash LT Journal
  PDF, 160 Kb, Archivo publicado: dic 1, 2002
  Extracto del documento

  DESIGN INFORMATION A 14-Bit ADC that is Both Fast and Low
  Noise
  by Richard Reay and Dave Thomas
  Introduction Flexible, Yet Easy to Use
  The LTC1744 is a complete solution
  with an on-chip sample and hold, a
  14-bit pipelined ADC and a 30ppm
  programmable reference, as shown 0
  fIN = 5MHz
  fS = 50Msps
  SFDR = 87dB
  SNR =77dB
  4096-point FFT LTC1744 Features
  –20 ❑ 50Msps sample rate
  вќ‘ 77dB SNR and 87dB SFDR at
  5MHz input
  вќ‘ 150MHz full power bandwidth
  sampling
  ❑ 2VP–P to 3.2VP–P input range
  вќ‘ 0.5V to 5V digital output range
  вќ‘ 48-pin TSSOP package AMPLITUDE (dBc) The LTC1744 is an exception to the
  rule that an ADC must tradeoff low
  noise performance for high sampling …

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• Data Conversion > Analog-to-Digital Converters (ADC) > High Speed ADCs (Fs >=10Msps)