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DAC11001A Datasheet(PDF) 33 Page - Texas Instruments

No. de Pieza. DAC11001A
Descripción  DACx1001 20-Bit, 18-Bit, and 16-Bit, Low-Noise, Ultra-Low Harmonic Distortion, Fast-Settling, High-Voltage Output, Digital-to-Analog Converters (DACs)
Descarga  42 Pages
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Fabricante  TI1 [Texas Instruments]
Página de inicio  http://www.ti.com
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DAC11001A Datasheet(HTML) 33 Page - Texas Instruments

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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
REFGND
+
±
AGND
+
±
DGND
IOVDD
+
±
AGND
Ana log
power
inpu ts
+
±
REFGND
AGND
LOA D-GND
Sing le-poin t sh ort
Isol ated re fere nce
power
AGND sha red betwe en
DAC an d l oad
DAC110 01
C1
C2
VREFP
VREFN
REFNF
REFNS
REFPF
REFPS
+
±
+
±
+
±
VOUT
REFGND
DGND
AGND
AGND-OUT
Sing le-poin t sh ort
LOA D-GND
Reference
Gen eration
Circuit
Loa d
Circuit
Sign al
Input
REFGND
+
±
LOA D-GND
+
±
DGND
IOVDD
+
±
AGND
Ana log
power
inpu ts
+
±
REFGND
Isol ated re fere nce
power
Isol ated lo ad power
33
DAC11001A, DAC91001, DAC81001
www.ti.com
SLASEL0 – OCTOBER 2019
Product Folder Links: DAC11001A DAC91001 DAC81001
Submit Documentation Feedback
Copyright © 2019, Texas Instruments Incorporated
10 Power Supply Recommendations
To get the best performance out of the DACx1001, the power supply, grounding, and decoupling are very
important. Use a PCB with a ground-plane reference, which helps in confining the digital return currents. A low
mutual inductance path is created just beneath the high-frequency digital traces causing the return currents to
follow the respective signal traces, thus minimizing crosstalk. On the other hand, dc signals spread over the
ground plane without being confined below the signal trace. Therefore, in precision dc applications, limiting the
common-impedance coupling is very difficult unless the ground planes are physically separated. Figure 24 shows
a method to divide the grounds so that there is no common-mode current flow between the grounds, while
maintaining the same dc potential across all grounds. This circuit assumes that the REFGND and LOAD-GND
are provided from isolated power sources, therefore, there is no common-mode current flow through the
reference or the load.
Figure 24. Power and Signal Grounding
When the load circuit is powered from a source referenced to AGND, and the LOAD-GND is shorted to AGND at
the far end, the AGND-OUT must no longer be shorted to AGND locally near the DAC. The local shorting creates
a ground loop, otherwise. The resulting connection that avoids the ground loop is shown in Figure 25.
Figure 25. Grounding Scheme When AGND is Load Ground
When the reference source is powered from a power source with AGND as the ground, there is a possibility of
common-impedance coupling causing a code-dependent shift in the reference voltage. To avoid undesired
coupling, drive REFGND using a buffer that maintains the reference ground potential equals to that of AGND-
OUT, as shown in Figure 26.


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