DC590B 데이터 시트보기 (PDF) - Linear Technology

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DC590B

USB SERIAL CONTROLLER

Linear Technology 

APPENDIX A

APPENDIX A: DC590A CONNECTIONS AND SCHEMATIC

This section shows the schematic and connec-

tions to DC590A, which DC590B replaces. The

only functional difference between DC590A and

DC590B is that the digital signals on DC590B can

be adjusted from 2.7 to 5V, where the DC590A is

5V only.

DC590B also offers improved isolation, as all 14

conductors on the 14 pin interface header are iso-

lated from the PC’s ground.

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 by placing JP1 in the OFF position, 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

9

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