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DC590A-1 Fiches technique(PDF) 4 Page - Linear Integrated Systems

No de pièce DC590A-1
Description  QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 590 USB SERIAL CONTROLLER FOR LINEAR TECHNOLOGY QUICKEVAL-TM DEMO BOARDS
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Fabricant  LINEAR [Linear Integrated Systems]
Site Internet  http://www.linearsystems.com
Logo LINEAR - Linear Integrated Systems

DC590A-1 Fiches technique(HTML) 4 Page - Linear Integrated Systems

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QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 590
USB SERIAL CONTROLLER FOR LINEAR TECHNOLOGY QUICKEVAL™ DEMO BOARDS
of the board and the demonstration circuit under evalua-
tion to be powered separately. This is recommended
when testing precision components such as high resolu-
tion ADCs and DACs.
Figure 3 shows how to connect an external supply to the
isolated side of the controller and the board under
evaluation. After disabling the switching supply, apply
7V–9V between the GND and V+ posts. These posts are
the in, out, and ground terminals of an LT1761 LDO
regulator. The demonstration circuit under evaluation
may draw up to 100mA from VCC.
7V
REGULATED
SUPPLY
DEMONSTRATION
CIRCUIT
UNDER
EVALUATION
14-CONDUCTOR
RIBBON
CABLE
USB CABLE
TO HOST PC
Figure 3. Connecting an external supply to the isolated side of the controller
Another option is to supply power to the isolated side of
the controller (see Figure 4) back through the board un-
der evaluation. The LT1761 regulator is reverse-current
protected. This allows any convenient 5V ±10% regu-
lated supply to be used. In this case, the isolation cir-
cuitry on DC590 is also powered from this source.
worst-case current draw by DC590 is 50mA.
DEMONSTRATION
CIRCUIT
UNDER
EVALUATION
14-CONDUCTOR
RIBBON
CABLE
5V
REGULATED
SUPPLY
USB CABLE
TO HOST PC
Figure 4. Supplying power to the controller through the board under evaluation
4


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