AFCT-5705PZ datasheet(3/20 Pages) AVAGO

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LASER DRIVER

& SAFETY

CIRCUITRY

SO+

SO–

AMPLIFICATION

QUANTIZATION

SI+

SI–

VREFR

TBC

EWRAP

RBC

Rx_RATE

Rx_LOS

GPIO(X)

GP14

REFCLK

Tx_FAULT

TBC

EWRAP

RBC

Rx_RATE

REFCLK

TX[0:9]

RX[0:9]

Tx_FAULT

Tx_DISABLE

TD+

TD–

TX GND

MOD_DEF2

EEPROM

MOD_DEF1

MOD_DEF0

RX GND

4.7 K to 10 K

3.3 V

4.7 K to

10 K

3.3 V

4.7 K to

10 K

4.7 K to

10 K

106.25 MHz

PROTOCOL

SFP MODULE

VCC,T

1 µH

10 µF

0.1 µF

3.3 V

4.7 K to 10 K

10 µF

0.1

µF

0.1 µF

4.7 K to 10 K

RD+

RD–

Rx_LOS

0.01 µF

100

0.01 µF

VCC,R

100

VCC,R

Transmitter Section

The transmitter section includes a 1310 nm Fabry-Perot

laser and a transmitter driver circuit. The driver circuit

maintains a constant optical power level provided that

the data pattern is valid 8B/10B code. Connection to the

transmitter is provided via a LC optical connector.

The transmitter has full IEC 60825 and CDRH Class 1 eye

safety.

TX_DISABLE

The transmitter output can be disabled by asserting pin

3, TX_DISABLE. A high signal asserts this function while

a low signal allows normal laser operation. In addition,

via the 2-wire serial interface the transmitter output can

be disabled (address A2h, byte 110, bit 6) or monitored

(address A2h, byte 110, bit 7). The contents of A2h, byte

110, bit 6 are logic OR’d with hardware Tx_Disable (pin

3) to control transmitter operation. In the event of a

transceiver fault, such as the activation of the eye safety

circuit, toggling of the TX_DISABLE will reset the trans-

mitter, as depicted in Figure 4.

Figure 3. Typical Application Configuration

VEET

TD–

TD+

VEET

VCCT

VCCR

VEER

RD+

RD–

VEER

TOP OF BOARD

VEET

TX FAULT

TX DISABLE

MOD-DEF(2)

MOD-DEF(1)

MOD-DEF(0)

RATE SELECT

LOS

VEER

BOTTOM OF BOARD

(AS VIEWED THROUGH TOP OF BOARD)

ENGAGEMENT

SEQUENCE

3 2 1

Figure 2. Pin description of the SFP electrical interface.

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