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Application Notes

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  Data Acquisition Circuit Collection &mdash AN62
  PDF, 349 Кб, Файл опубликован: 1 окт 1994
  This application note presents a wide variety of data acquisition circuits. The detailed circuit schematics cover 8-, 10-, and 12- bit ADC and DAC applications, serial and parallel digital interfaces, battery monitoring, temperature sensing, isolated interfaces, and connections to various popular microprocessors and microcontrollers. An appendix covers suggested voltage references.
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  Application Note 62
  October 1994
  Data Acquisition Circuit Collection
  Kevin R. Hoskins
  INTRODUCTION
  This application note features 8-, 10-, and 12-bit data
  acquisition components in various circuit configurations.
  The circuits include battery monitoring, temperature sensing, isolated serial interfaces, and microprocessor and
  microcontroller serial and parallel interfaces. Also included are voltage reference circuits (Application Note 42
  contains more voltage reference circuits). Additional circuit information is located in the information
  references listed in the Circuit Index. Each information
  reference refers to either an application note (example:
  AN42 = Application Note 42), a data sheet (example:
  LTCВ®1292 DS = LTC1292 Data Sheet), or a design note
  (example: DN66 = Design Note 66).
  and LTC are registered trademarks and LT is a trademark of Linear Technology Corporation. CIRCUIT INDEX
  FIGURE TITLE
  FIGURE NO.
  General Analog-to-Digital Application Circuits
  Two-Quadrant 150kHz Bandwidth Analog Multiplier . Figure 1 .
  Infinite Hold-Time Sample-and-Hold (tACQ = 240ns) . Figure 2 .
  Four-Quadrant 250kHz Bandwidth Analog Multiplier . Figure 3 .
  Demodulating a Signal Using Undersampling . Figure 4 . …

Design Notes

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  New 5V and 3V, 12-Bit ADCs Sample at 300kHz on 75mW and 140kHz on 12mW &mdash DN66
  PDF, 74 Кб, Файл опубликован: 1 янв 1993
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  New 5V and 3V, 12-Bit ADCs Sample at 300kHz on 75mW
  and 140kHz on 12mW -Design Note 66
  William Rempfer Complete ADCs Provide Lowest Power and
  Highest Speed on Single or Dual Supplies
  The LTC1273/5/6 and LTC1282 provide complete
  A/D solutions at previously impossible speed/power
  levels. As shown in Table 1, the LTC1273/5/6 all have
  the same 300kHz maximum sampling rate and 75mW
  typical power dissipation. The LTC1273 digitizes 0V
  to 5V inputs from a single 5V rail. The LTC1275 and
  LTC1276 operate on В±5V rails and digitize В±2.5V and
  В±5V inputs, respectively.
  Table 1. Four New Complete ADCs Offer High Supplies
  and Low Power on Single or Dual 5V or 3V Supplies
  DEVICE POWER
  SUPPLIES INPUT
  RANGE SAMPLE S/(N + D) PDISS
  RATE at FINPUT (Typ) LTC1273 Single 5V 0V to 5V 300kHz LTC1275/6
  LTC1282 В±5V В±2.5/В±5V 70dB at 75mW
  100kHz 300kHz 70dB at 75mW
  100kHz Single 3V 0V to 2.5V 140kHz
  or В±3V
  or В±1.25 140kHz 68dB at 12mW …

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  New 500ksps and 600ksps ADCs Match Needs of High Speed Applications &mdash DN88
  PDF, 88 Кб, Файл опубликован: 1 ноя 1994
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  500ksps and 600ksps ADCs Match Needs of
  High Speed Applications – Design Note 88
  Kevin R. Hoskins Power Shutdown: 5mW Wakes Up in a Scant 300ns Single 5V or В±5V Supply Voltage Operation Low Power Dissipation: 150mW (Max), 75mW (Typ) Small 24-Pin SO or 24-Pin Narrow DIP Packages
  The LTC1278/LTC1279’s DC performance includes
  В±1LSB INL and DNL, no missing codes, and an internal
  voltage reference with a full-scale drift of only 25ppm/В°C.
  The AC performance includes 70dB (Min) SINAD,
  –78dB (Max) THD, and –82dB (Max) spurious-free
  dynamic range. These specifications were measured
  at fS = 500ksps (LTC1278) or fS = 600ksps (LTC1279),
  fIN = 100kHz, and are guaranteed over the operating
  temperature range. The plot of effective-number-of-bits
  (ENOB) shown in Figure 1 clearly indicates that the
  LTC1278/LTC1279 can accurately sample signals that
  contain spectral energy beyond the Nyquist frequency.
  Newest High Speed ADC Family Members
  The LTC1278/LTC1279 are self-contained ADC systems
  composed of a fast capacitively-based charge redistribution Successive Approximation Register (SAR)
  sampling ADC, internal reference, power shutdown,
  and internally generated and synchronized conversion
  11/94/88_conv 74
  68 12
  11 62 10 …

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Классификация производителя

• Data Conversion > Analog-to-Digital Converters (ADC) > Precision ADCs (Fs < 10Msps) > Single Channel ADCs