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TLC7226CDWR Datasheet(PDF) 9 Page - Texas Instruments |
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TLC7226CDWR Datasheet(HTML) 9 Page - Texas Instruments |
9 / 21 page TLC7226C, TLC7226I, TLC7226M QUADRUPLE 8BIT DIGITALTOANALOG CONVERTERS SLAS060F − JANUARY 1995 − REVISED APRIL 2009 9 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 PRINCIPLES OF OPERATION interface logic information (continued) 17 16 15 A0 A1 WR To Latch A To Latch B To Latch C To Latch D Figure 6. Input Control Logic unipolar output operation The unipolar output operation is the basic mode of operation for each channel of the TLC7226, with the output voltages having the same positive polarity as Vref. The TLC7226 can be operated with a single power supply (VSS = AGND) or with positive/negative power supplies. The voltage at Vref must never be negative with respect to AGND to prevent parasitic transistor turnon. Connections for the unipolar output operation are shown in Figure 7. Transfer values are shown in Table 3. _ + DAC A _ + DAC B _ + DAC C _ + DAC D 4 REF 2 1 20 19 OUTA OUTB OUTC OUTD Figure 7. Unipolar Output Circuit LSB MSB DAC LATCH CONTENTS ANALOG OUTPUT ) V ref 255 256 1111 1111 ) V ref 129 256 1000 0001 1000 0000 ) V ref 128 256 +) V ref 2 0111 1111 ) V ref 127 256 0000 0001 ) V ref 1 256 0000 0000 0 V NOTE A. 1 LSB + V ref 2–8 + V ref 1 256 Table 3. Unipolar Code |
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