Fast Ethernet PHY ICs (100BASE-FX)

Pablo,

First, I apologize for consecutive moves of your post.  The Ethernet forum is relatively new, but it is the correct place for posts related to the DP83xxx and TLK1xx devices.

Regarding the best device for your application, we will need to discuss your overall project goals first.  The one device on your list that is probably not best suited is the DP83843.  This is a good device, but is older and not as well suited for new designs.

The remaining devices that you listed all support 100Base-FX and have EVMs.  An additional device, TLK111, also meets these requirements.  Note that the EVMs include a footprint for an Avago optical transceiver, but not the transceiver itself.  You would need to acquire that separately.

The PHYs that support fiber have many commonalities.  What are your priorities in terms of package type (QFP vs. QFN), pin count (48 vs. 32), operating temperature (85C vs. 105C), and features (JTAG support, clock output, LEDs, etc.)?  Those priorities should help narrow down the selection.

Patrick

Hello, Patrick.

First of all, I would like to thank you for your support and for moving my post to the right place.

The application I am working on is the following: The target is to find the appropriate TI PHY IC for the communication with the Avago part AFBR-59E4APZ, which is an LVPECL optical TRx.

The aim is to see what terminations (resistors) are required on both sides of the link (PHY IC side and TRx side) and also whether the coupling between both the IC and the TRx is AC or DC. Once this is achieved, I also would like to see how these resistors and capacitors (if required) change depending on the Avago Fast Ethernet optical module involved in the communication (in other words, the AFBR-59E4APZ would be changed for a different TRx).

This said, I would say the type of package, the number of pins or the JTAG support are not key parameters of this application. The temperature here would be relevant, and the desired range is -40°C to +85°C.

Thanks, once more, for your help.

Pablo

Hello Pablo,

both the TLK105L (32 pin) and TLK111 (48 pin) will suite your temp requirements, both can interface 100 Base-FX Tranceivers. currently our Data sheet (design guidelines chapter) provides recommended method to connect the PHY to the optic transceiver AVAGO™ AFBR5803Z. please reply if this transceiver is not suitable to your needs and we will look at  AFBR-59E4APZ interfacing options.

Thanks,

Aviad  

Hello, Aviad.

Thanks for your answer.

I will have a look tomorrow in the office at the differences between the 32-pin version (TLK105L) and the 48-pin version (TLK111) of the PHY. By the way, are there existing evaluation boards for both PHYs?

Regarding the optical transceiver, it would have to be the AFBR-59E4APZ.

Best regards,

Pablo

One more question:

From the point of view of the terminations (resistors) and coupling (AC/DC) between the PHY and the optical transceiver (AFBR-59E4APZ): Would there be any difference depending on the chosen PHY (TLK105L / TLK111)?

Best regards,

Pablo

Hi, Patrick.

Thanks so much for the support.

If you could also help with the design of the connection between TLK105L and the optical module AFBR-59E4APZ, I would really appreciate it.

Best regards,

Pablo

Hi, Aviad.

Thanks very much for the explanation.

I am interested in getting one eval board for the PHY TLK105L. I have checked the TI website and I have seen that the eval board which is available for this product includes only an RJ-45 interface.

Is there any chance to have the eval board with an interface for an optical module?

Best regards,

Pablo

Thank you very much, Aviad.

I will check the availability again in two months time.

Best regards,

Pablo

Hi, Aviad.

Retaking the conversation I started a couple of months ago: Has the eval board of TLK105L with an optical interface been released yet? If so, please, let me know the reference so that I can order one.

Best regards,

Pablo

Hi Pablo, still not out. it is now estimated to be ready about april or may. sorry about that. Aviad

Thanks a lot for the reply, Aviad.

I will come back to you in a couple of months.

Best,

Pablo