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DAC81001 Datasheet(PDF) 34 Page - Texas Instruments |
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DAC81001 Datasheet(HTML) 34 Page - Texas Instruments |
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34 / 42 page  DAC110 01 C1 C2 VREFP1 VREFN1 REFNF REFNS REFPF REFPS + ± + ± + ± VOUT1 REFGND1 DGND AGND AGND-OUT1 Sing le-poin t sh ort commo n to all DA Cs Reference Gen eration Circuit Loa d Circuit Sign al Input + ± AGND + ± DGND IOVDD + ± AGND Ana log power inpu ts + ± AGND AGND LOA D-GND1 Sing le-poin t sh ort DAC110 01 C3 C4 VREFP2 VREFN2 REFNF REFNS REFPF REFPS + ± + ± + ± VOUT2 REFGND2 DGND AGND AGND-OUT2 Reference Gen eration Circuit Loa d Circuit Sign al Input + ± AGND + ± DGND IOVDD + ± AGND Ana log power inpu ts + ± AGND AGND LOA D-GND2 Sing le-poin t sh ort ICROS STALK = 0 ICROS STALK = 0 AGND sha red across DACs, referen ces, and load s DGND AGND Kelvin connection close to th e p in Kelvin connection close to th e p in DGND shared across DACs DAC110 01 C1 C2 VREFP VREFN REFNF REFNS REFPF REFPS + ± + ± + ± VOUT REFGND DGND AGND AGND-OUT Sing le-poin t sh ort Reference Gen eration Circuit Loa d Circuit Sign al Input + ± AGND + ± DGND IOVDD + ± AGND Ana log power inpu ts + ± AGND AGND LOA D-GND Sing le-poin t sh ort Kelvin connection close to th e p in AGND sha red betwe en DAC an d r efe rence AGND sha red betwe en DAC an d l oad 34 DAC11001A, DAC91001, DAC81001 SLASEL0 – OCTOBER 2019 www.ti.com Product Folder Links: DAC11001A DAC91001 DAC81001 Submit Documentation Feedback Copyright © 2019, Texas Instruments Incorporated Figure 26. Connecting the Reference Ground Channel-to-channel dc crosstalk is a major concern in multichannel applications, such as battery test equipment. While the DACx1001 is single-channel, the crosstalk problem can appear at a system level when using multiple DACx1001 devices. The problem becomes severe when the grounds of the loads are shorted together creating a possible ground loop. In such cases, avoid the local short between AGND and AGND-OUT. Use a single short between AGND and DGND for all the DACs. If the PCB layout allows for the digital signal and analog power supplies to be kept separate, DGND and AGND can be combined to a single ground plane. Figure 27 shows an example circuit for minimizing dc crosstalk across DAC channels in a system. Figure 27. Minimizing Multichannel DC Crosstalk |
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