Optoway

BTR-7740G

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Tel: 886-3-5979798

Fax: 886-3-5979737

E-mail: sales@optoway.com.tw

http: // www.optoway.com.tw

10/1/2005 V2.0

3

CONNECTION DIAGRAM

Receiver Signal Ground

1 (Rx GND)

Receiver Data Out

2 (RD+)

N/C

Receiver Data Out Bar

3 (RD

−)

Signal Detect

4 (SD)

Receiver Power Supply

5 (Rx Vcc)

TOP VIEW

Transmitter Power Supply

6 (Tx Vcc)

Transmitter Data In Bar

7 (TD

−)

Transmitter Data In

8 (TD+)

N/C

Transmitter Signal Ground

9 (Tx GND)

PIN

Symbol

Notes

1

Rx GND

Directly connect this pin to the receiver ground plane

2

RD+

See recommended circuit schematic

3

RD

−

See recommended circuit schematic

4

SD

Active high on this indicates a received optical signal

5

Rx Vcc

+3.3V dc power for the receiver section

6

Tx Vcc

+3.3V dc power for the transmitter section

7

TD

−

See recommended circuit schematic

8

TD+

See recommended circuit schematic

9

Tx GND

Directly connect this plan to the trransmitter ground plane

RECOMMENDED CIRCUIT SCHEMATIC

RXGND

1

RD+

2

RD-

3

RXVCC

5

TXVCC

6

TD-

7

TD+

8

SD

4

TXGND

9

U2

BTR-77XX(C)/76XX(C)

MICROSTRIP6

Z=5OR

MICROSTRIP5

Z=50R

L2

1uH

C2

100nF

C4

10uF

C3

100nF

Vcc3.3V

L1

1uH

C8

10uF

C1

100nF

MICROSTRIP8

Z=5OR

MICROSTRIP7

Z=50R

R21

1K

PHY DEVICE

TD-

TD+

RD+

RD-

C9

100nF

C10

100nF

R14

100R

C12

100nF

C11 100nF

R3

NA

R4

NA

Vcc3.3V

R2

NA

R1

NA

Vcc3.3V

Vcc3.3V

LVPECL

Vcc3.3V

LVPECL

SD / LVPECL

The split-load terminations for ECL signals need to be located at the input of devices receiving those ECL signals. The power

supply filtering is required for good EMI performance. Use short tracks from the inductor L1/L2 to the module Rx Vcc and Tx

Vcc. A GND plane under the module is required for good EMI and sensitivity performance.