AFCT-739ASMZ datasheet(4/18 Pages) AVAGO

4 / 18 page

Receiver Section

The receiver section includes the Receiver Optical Sub-

Assembly (ROSA) and the amplification/quantization cir-

cuitry. The ROSA, containing a PIN photodiode and cus-

tom transimpedance amplifier, is located at the optical

interface and mates with the LC optical connector. The

ROSA output is fed to a custom IC that provides post-

amplification and quantization.

Receiver Loss of Signal (Rx_LOS)

The post-amp IC also includes transition detection cir-

cuitry which monitors the AC level of incoming optical

signals and provides a LVTTL/CMOS compatible status

signal to the host. A high status signal indicates loss of

modulated signal, indicating link failures such as broken

fiber or failed transmitter. Rx_LOS can also be monitored

via the two-wire serial interface (address A2h, byte 110,

bit 1).

Functional Data I/O

The AFCT-739ASMZ interfaces with the host circuit

board through the twenty contact SFP+ electrical con-

nector. See Table 2 for contact descriptions. The mod-

ule edge connector is shown in Figure 3. The host board

layout for this interface is depicted in Figure 6.

The AFCT-739ASMZ high speed transmit and receive in-

terfaces require SFF-8431 compliant signal lines on the

host board. To simplify board requirements, biasing re-

sistors and AC coupling capacitors are incorporated into

the SFP+ transceiver module (per SFF-8431) and hence

are not required on the host board. The TX_DISABLE, TX_

FAULT and RX_LOS signals require LVTTL signals on the

host board (per SFF-8431) if used. If an application does

not take advantage of these functions, care must be tak-

en to ground TX_DISABLE to enable normal operation.

Figure 2 depicts the recommended interface circuit to

link the AFCT-739ASMZ to supporting physical layer ICs.

Timing for the dedicated SFP+ control signals imple-

mented in the transceiver are listed in Figure 5.

Application Support

An Evaluation Kit and Reference Designs are available to

assist in evaluation of the AFCT-739ASMZ. Please con-

tact your local Field Sales representative for availability

and ordering details.

Caution

There are no user serviceable parts nor maintenance

requirements for the AFCT-739ASMZ. All mechanical

adjustments are made at the factory prior to shipment.

Tampering with, modifying, misusing or improperly han-

dling the AFCT-739ASMZ will void the product warranty.

It may also result in improper operation and possibly

overstress the laser source. Performance degradation

or device failure may result. Connection of the AFCT-

739ASMZ to a light source not compliant with IEEE Std.

802.3ae Clause 52 and SFF-8341 specifications, operat-

ing above maximum operating conditions or in a man-

ner inconsistent with it’s design and function may result

in exposure to hazardous light radiation and may consti-

tute an act of modifying or manufacturing a laser prod-

uct. Persons performing such an act are required by law

to recertify and re-identify the laser product under the

provisions of U.S. 21 CFR (Subchapter J) and TUV.

Customer Manufacturing Processes

This module is pluggable and is not designed for aque-

ous wash, IR reflow, or wave soldering processes.

Ordering Information

Please contact your local field sales engineer or one of

Avago Technologies franchised distributors for ordering

information. For technical information, please visit Ava-

go Technologies’WEB page at www.avagotech.com. For

information related to SFF Committee documentation

visit www.sffcommittee.org.

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