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LTC1446L

Application Notes

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  Linear Technology Magazine Circuit Collection, Volume V: Data Conversion, Interface and Signal Conditioning Products &mdash AN87
  PDF, 1.5 Мб, Файл опубликован: 1 ноя 2000
  Application Note 87 is the fifth in a series that excerpts useful circuits from Linear Technology magazine. Data conversion, interface and signal conditioning circuits from issue VI:1 (February 1996) through issue VIII:4 (November 1998) are featured. Like its predecessor, AN67, this Application Note includes circuits for high speed video, interface and hot swap circuits, active RC and switched capacitor filter circuitry and a variety of data conversion and instrumentation circuits. All circuits are conveniently indexed by type.
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  Application Note 87
  November 2000 Linear Technology Magazine Circuit Collection, Volume V
  Data Conversion, Interface and Signal Conditioning Products
  Richard Markell, Editor
  INTRODUCTION
  Application Note 87 is the fifth in a series that excerpts
  useful circuits from Linear Technology magazine to preserve them for posterity. This application note highlights
  data conversion, interface and signal conditioning circuits
  from issue VI:1 (February 1996) through issue VIII:4
  (November 1998). Like its predecessor, AN67, this Application Note includes circuits for high speed video, interface and hot swap circuits, active RC and switched capacitor filter circuitry and a variety of data conversion and instrumentation circuits. There are also several circuits
  that cannot be so neatly categorized. So, without further
  ado, I’ll let the authors describe their circuits.
  Note: Article Titles appear in this application note exactly
  as they originally appeared in Linear Technology magazine. This may result in some inconsistency in the usage
  of terminology. TABLE OF CONTENTS
  Introduction . 1
  DATA CONVERTERS
  The LTC®1446 and LTC1446L: World’s First Dual 12-Bit DACs in SO-8 Packages . 3
  Multichannel A/D Uses a Single Antialiasing Filter. 4
  LTC1454/54L and LTC1458/58L: Dual and Quad 12-Bit, Rail-to-Rail, Micropower DACs . 5
  Micropower ADC and DAC in SO-8 Give PC 12-Bit Analog Interface . 7
  The LTC1594 and LTC1598: Micropower 4-and 8-Channel 12-Bit ADCs . 10
  MUX the LTC1419 Without Software . 13 …

Design Notes

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  The LTC1446/LTC1446L: World's First Dual 12-Bit DACs in SO-8 &mdash DN131
  PDF, 77 Кб, Файл опубликован: 3 июн 1996
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  The LTC1446/LTC1446L: World’s First Dual 12-Bit DACs in SO-8
  Design Note 131
  Hassan Malik and Kevin R. Hoskins
  The LTCВ®1446/LTC1446L are the п¬Ѓrst dual, single supply,
  rail-to-rail voltage output 12-bit DACs. Both parts include
  an internal reference and two DACs with rail-to-rail
  output buffer amplifiers, packaged into a space-saving
  8-pin SO or PDIP package. The LTC1446’s patented
  architecture is inherently monotonic and has excellent
  12-bit DNL, guaranteed to be less than 0.5LSB. These
  parts have an easy-to-use SPI compatible interface that
  allows daisy-chaining.
  Low Power 5V or 3V Single Supply
  The LTC1446 has an output swing of 0V to 4.095V, with
  each LSB equal to 1mV. It operates from a single 4.5V
  to 5.5V supply, drawing 1mA. The LTC1446L has an
  output swing of 0V to 2.5V, operates on a single 2.7V
  to 5.5V supply and draws 650ОјA.
  Complete Stand-Alone Performance
  Figure 1 shows a block diagram of the LTC1446/
  LTC1446L. The data inputs for both DAC A and DAC B
  are clocked into one 24-bit shift register. The п¬Ѓrst 12-bit
  segment is for DAC A and the second is for DAC B. Each 12-bit segment is loaded MSB п¬Ѓrst and latched into the …

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  Micropower ADC and DAC in SO-8 Give PCs a 12-Bit Analog Interface &mdash DN138
  PDF, 78 Кб, Файл опубликован: 3 сен 1996
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  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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