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DAC7632 датащи(PDF) 19 Page - Burr-Brown (TI) |
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DAC7632 датащи(HTML) 19 Page - Burr-Brown (TI) |
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19 / 21 page ![]() DAC7632 19 SBAS234 www.ti.com SYMBOL DESCRIPTION MIN MAX UNITS tDS Data Valid to CLK Rising 10 ns tDH Data Held Valid after CLK Rises 20 ns tCH CLK HIGH 25 ns tCL CLK LOW 25 ns tCSS CS LOW to CLK Rising 15 ns tCSH CLK HIGH to CS Rising 0 ns tLD1 LOAD HIGH to CLK Rising 10 ns tLD2 CLK Rising to LOAD LOW 30 ns tLDRW LOAD LOW Time 30 ns tLDDL LDAC LOW Time 100 ns tLDDH LDAC HIGH Time 100 ns tLDDD LOAD LOW to LDAC Rising 40 ns tRSSS RESETSEL Valid to RESET HIGH 0 ns tRSSH RESET HIGH to RESETSEL Not Valid 100 ns tRSTL RESET LOW Time 10 ns tRSTH RESET HIGH Time 10 ns tSDO SDO Propogation Delay 10 30 ns tS Settling Time 10 µs TABLE III. Timing Specifications (TA = –40°C to +85°C). FIGURE 16. 4-20mA Digitally-Controlled Current Source. V OUTA V OUTA Sense V REFL Sense V REFL V REFH V REFH Sense V OUTB Sense V OUTB 32 31 30 29 28 27 26 25 DAC7632 1000pF I OUT 100 Ω +2.5V 20k Ω 80k Ω +V +V OPA2350 100 Ω 2200pF 1000pF 2200pF V PROGRAMMED 125 Ω I OUT V PROGRAMMED 125 Ω Figure 16 shows a DAC7632 in a 4-20mA current output configuration. The output current can be determined by Equation 3: I VV N V OUT = • + 25 05 125 65 536 05 125 . – . , . ΩΩ At full-scale, the output current is 16mA, plus the 4mA, for the zero current. At zero scale the output current is the offset current of 4mA (0.5V/125 Ω). |
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