LTC4271 datasheet(5/28 Pages) LINER

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dc1843bfa

DEMO MANUAL DC1843B

DEMONSTRATION CIRCUIT 1842B OPERATION

Board Layout

Proper board layout is crucial for proper LTC4290B/

LTC4271 chipset operation, robustness, and accuracy.

When laying out, pay attention to parts placement, Kelvin

sensing, power paths, and copper fill. It is imperative to

follow the LTC4290B/LTC4271 Layout Guide document

when laying out the board. Contact Linear Technology

Corporation for this document.

Figure 6. DC1842B Digital and Analog Isolation

Isolation and Power Supplies

The LTC4290B/LTC4271 chipset provides communication

across an isolation barrier through a data transformer

(Figure 6). This eliminates the need for expensive opto-

couplers. All digital pins reside on the digital ground refer-

ence and are isolated from the analog PoE supply. A 3.3V

supply for VDD and an isolated VEE supply are connected

to the DC1842B through the 30-pin connector.

VDD33

DND

CPD

CND

DPD

AGND

VEE

DNA

VEE

ISOLATION

WÜRTH 7490100143

CPA

30-PIN

CONNECTOR

DC1842A SIDE

DC1680B SIDE

VDD33 SUPPLY

VEE SUPPLY

CNA

DPA

TX+

RX–

CT(4)

CT(2)

RX+

TX–

TD+

RD–

CT(3)

RD+

TD–

LTC4271

LTC4290

C23

1µF

C21

0.1µF

R13

100

DC1843A F06

DGND

C19

1µF

100V

SMAJ58A

R14

100

C22

1µF

R15

100

R16

100

R21

100

R35

R22

100

R23

100

R24

100

C24, 2nF

2kV

TVSBULK

CBULK

+–

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