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Design Notes

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  12-bit DAC in TSOT-23 Includes Bidirectional REF Pin for Connection to Op Amp or External High Precision Reference &mdash DN448
  PDF, 87 Кб, Файл опубликован: 25 авг 2008
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  12-bit DAC in TSOT-23 Includes Bidirectional REF Pin for
  Connection to Op Amp or External High Precision Reference
  Design Note 448
  Kevin Wrenner, Troy Seman and Mark Thoren
  Introduction
  The LTC®2630’s combination of a 12-bit DAC and low-drift
  integrated reference in a tiny SC-70 package has proven
  popular for a wide variety of applications. Two new DACs,
  the LTC2631 and LTC2640, take this winning formula and
  further expand its reach by adding a bidirectional REF pin
  and an optional I2C interface in a tiny TSOT-23. The LT1991 precision op amp is a superb choice for
  amplifying or attenuating the DAC output to achieve a
  desired output range because it requires no precision
  external resistors. Its integrated, precision resistors are
  matched to 0.04%, allowing gain to be set by simple pin
  strapping (see the data sheet for a large variety of gain
  options). Figure 1 shows the configuration for a difference
  gain of 4, resulting in a В±5V output with 12-bit programmability under I2C control. Integral nonlinearity, seen in
  Figure 2, is better than 1LSB. Like their predecessor, these parts feature 1-bit INL and
  DNL, offer excellent load regulation driving up to 10mA
  loads, and can operate rail-to-rail. See Table 1 for a list
  of options. Figure 3 shows a negative output system using a similar
  setup, this time with the LT1991 conп¬Ѓgured as an inverting …

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