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TLC1551I Datasheet(PDF) 9 Page - Texas Instruments |
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TLC1551I Datasheet(HTML) 9 Page - Texas Instruments |
9 / 18 page TLC1550I, TLC1550M, TLC1551I 10BIT ANALOGTODIGITAL CONVERTERS WITH PARALLEL OUTPUTS SLAS043G − MAY 1991 − REVISED NOVEMBER 2003 9 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 PRINCIPLES OF OPERATION The operating sequence for complete data acquisition is shown in Figure 3. Processors can address the TLC1550 and TLC1551 as an external memory device by simply connecting the address lines to a decoder and the decoder output to CS. Like other peripheral devices, the write (WR) and read (RD) input signals are valid only when CS is low. Once CS is low, the onboard system clock permits the conversion to begin with a simple write command and the converted data to be presented to the data bus with a simple read command. The device remains in a sampling (track) mode from the rising edge of EOC until conversion begins with the rising edge of WR, which initiates the hold mode. After the hold mode begins, the clock controls the conversion automatically. When the conversion is complete, the end-of-conversion (EOC) signal goes low indicating that the digital data has been transferred to the output latch. Lowering CS and RD then resets EOC and transfers the data to the data bus for the processor read cycle. 0.8 V 0.8 V 0.8 V 0.8 V 1.4 V 2 V 1.4 V 0.8 V 2 V 0.8 V 2 V 0.8 V 2 V 0.8 V tsu(CS) th(CS) tw(WR) tc tsu(CS) th(CS) tdis(D) tv(D) ta(D) td(EOC) 0.8 V 2 V CS WR RD EOC D0 − D9 Data Valid Figure 3. TLC1550 or TLC1551 Operating Sequence |
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