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Motor de Búsqueda de Datasheet de Componentes Electrónicos |
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Motor de Búsqueda de Datasheet de Componentes Electrónicos |
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DAC1021 Datasheet(PDF) 7 Page - National Semiconductor (TI) |
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DAC1021 Datasheet(HTML) 7 Page - National Semiconductor (TI) |
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7 / 14 page  Typical Applications (Continued) VOUT e b VREF A12aA24aA38a A10 1024 J where VREF can be an AC signal By connecting the DAC in the feedback loop of an opera- tional amplifier a linear digitally control gain block can be realized Note that with all digital inputs low the gain of the amplifier is infinity that is the op amp will saturate In other words we cannot divide the VREF by zero FIGURE 10 Analog-to-Digital Divider (or Digitally Gain Controlled Amplifier) VOUT e VREF % A1 2 a A2 4 a a A10 1024 A1 2 a A2 4 a a A10 1024 – or VOUT e VREF 1023bN N J where 0 s N s 1023 N e 0 for AN e all zeros N e 1 for A10 e 1 A1–A9 e 0 N e 1023 for AN e all 1’s FIGURE 11 Digitally controlled Amplifier-Attenuator TLH5689 – 7 http www nationalcom 7 |
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