AFE4403EVM: 3 LEDs simultaneously

Jason Naramore

Part Number: AFE4403EVM
Other Parts Discussed in Thread: AFE4403, AFE4404

I understand from a previous post that the 3rd LED is "a static mode selection as opposed to dynamic switching selection. The device does not support simultaneous 3 LED operation."

Is this a limitation of the evaluation board, or the AFE4403 chip? In other words, is simultaneous 3-wavelength operation available with the AFE4403 chip?

Previous post for reference:

https://e2e.ti.com/support/data-converters-group/data-converters/f/data-converters-forum/1040302/afe4403evm-afe4403evm-configuration-for-3-leds?tisearch=e2e-sitesearch&keymatch=AFE4403EVM#

over 2 years ago

0 ChienChun Yang over 2 years ago

TI__Mastermind 19815 points

Hi,

According to datasheet page 41 and Figure 8-18. Multiplexing Third LED, the 3rd LED connected to TX3 is muxed, so it cannot be simultaneously with the LED connected to TXP pin.

Thanks

0 Jason Naramore over 2 years ago in reply to ChienChun Yang

Prodigy 20 points

Thanks. I wonder why it was implemented this way, instead of running the 3 LEDs simultaneously like the AFE4404. Any idea if there is a design advantage? Maybe only having a 2-channel timing engine in the chip?

0 ChienChun Yang over 2 years ago in reply to Jason Naramore

TI__Mastermind 19815 points

We are not allowed to disclose/share the detailed design/thinking pattern and processes for the IC.

Thanks.

Data converters

Data converters forum

AFE4403EVM: 3 LEDs simultaneously