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Notas de Diseño

• Descargar
  Micropower 12-Bit ADCs Shrink Board Space &mdash DN116
  PDF, 74 Kb, Archivo publicado: oct 1, 1995
  Extracto del documento

  Micropower 12-Bit ADCs Shrink Board Space – Design Note 116
  Kevin R. Hoskins Many portable and battery-powered systems require
  internal analog-to-digital conversion. Some, such as
  pen-based computers, have ADCs at their very cores
  digitizing the pen screen. Other systems use ADCs more
  peripherally to monitor voltages or other parameters
  inside the equipment. Regardless of the use, it has been
  difficult to obtain small ADCs at power levels and prices
  that are low enough. The LTC1286/LTC1298 meet these
  low power dissipation and package size needs.
  Micropower and 12-Bits in an SO-8 Package
  The LTC1286/LTC1298 are the latest members of the
  growing family of SO-8 packaged parts (TableВ  1).
  As the п¬Ѓrst of their kind in SO-8 packages, these are
  improvements to the 8-bit micropower LTC1096/
  LTC1098 ADCs. The LTC1286/LTC1298 use a successive approximation register (SAR) architecture. Both
  converters contain sample-and-holds and serial data
  Table 1. LTC Micropower 3V and 5V 12-Bit ADCs DEVICE POWER
  DISSIPATION
  AT 200ksps SAMP
  FREQ S/(N+D)
  AT
  INPUT POWER …

• Descargar
  Micropower ADC and DAC in SO-8 Give PCs a 12-Bit Analog Interface &mdash DN138
  PDF, 78 Kb, Archivo publicado: sept 3, 1996
  Extracto del documento

  Micropower ADC and DAC in SO-8 Give PCs
  a 12-Bit Analog Interface – Design Note 138
  Kevin R. Hoskins
  Introduction
  Adding two channels of analog input/output to a PC
  computer is simple, inexpensive, low powered and
  compact when using the LTC В®1298 ADC and LTC1446
  DAC. The LTC1298 and the LTC1446 are the п¬Ѓrst SO-8
  packaged 2-channel devices of their kind. While the
  application shown is for PC data acquisition, the two
  converters provide the smallest, lowest power solutions
  for many other analog I/O applications. PC 2-Channel Analog I/O Interface
  The circuit shown in Figure 1 connects to a PC’s serial
  interface using four interface lines: DTR, RTS, CTS and
  TX. DTR is used to transmit the serial clock signal, RTS
  is used to transfer data to the DAC and ADC, CTS is
  used to receive conversion results from the LTC1298,
  and the signal on TX selects either the LTC1446 or
  the LTC1298 to receive input data. The LTC1298’s and
  LTC1446’s low power dissipation allow the circuit to
  be powered from the serial port. The TX and RTS lines
  charge capacitor C4 through diodes D5 and D6. An
  LTВ®1021-5 regulates the voltage to 5V. Returning the …

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