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DAC7642VF Datasheet(PDF) 17 Page - Texas Instruments |
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DAC7642VF Datasheet(HTML) 17 Page - Texas Instruments |
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17 / 25 page  DAC7642, DAC7643 17 SBAS233 www.ti.com INPUT DAC DACSEL R/W CS RST LOADDACS REGISTER REGISTER MODE DAC L L L L, H X Write Hold Write Input A H L L L, H X Write Hold Write Input B L H L L, H X Read Hold Read Input A H H L L, H X Read Hold Read Input B X X H L, H ↑ Hold Write Update All X X H L, H L, H Hold Hold Hold All XX X ↑ L, H Reset Reset Reset All TABLE I. DAC7642 and DAC7643 Logic Truth Table. t RCS CS t RDS t RDH t AS t CSD t DZ t AH R/W DACSEL Data Out Data Valid t WCS CS t WS t AS t AH t WH R/W DACSEL t LS t LWD t LH t S ±0.003% of FSR Error Band ±0.003% of FSR Error Band t LX LOADDACS t DS t DH Data In V OUT t S Data Read Timing Data Write Timing t RSH RST V OUT +FS –FS (DAC7643) Zero-Scale V OUT +FS –FS (DAC7642) Midscale t RSS FIGURE 14. Digital Input and Output Timing. (1) DIGITAL TIMING Figure 14 and Table II provide detailed timing for the digital interface of the DAC7642 and DAC7643. DIGITAL INPUT CODING The DAC7642 and DAC7643 input data is in Straight Binary format. The output voltage is given by Equation 1: VV L VH VL N OUT REF REF REF =+ ( ) –• , 65 536 where N is the digital input code. This equation does not include the effects of offset (zero-scale) or gain (full-scale) errors. |
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