TDA4VH-Q1: DPHY

cao qi

Part Number: TDA4VH-Q1

We encountered a problem in DPHY signal simulation and wanted to ask: when using the IBIS model of TDA4 as the output, the amplitude of the signal is more than 360mV specified by the DPHY signal, and the high level reaches 500mV.我们在DPHY信号仿真当中遇到一个问题想请教：当使用TDA4的IBIS模型作为输出端的时候，信号的幅值是超过DPHY信号规定的360mV的，高电平达到500mV，想请教一下这个如何优化？

以下是信号波形，使用的IO名称是dphy_out_2.5gbps

Below is the signal waveform, using the IO name dphy_out_2.5gbps

over 2 years ago

0 Mark L. over 2 years ago

TI__Expert 5870 points

Hello Cao,

Thank you for your inquiry. I will need time to research this issue-- I will respond by the end of the week, Friday.

Thanks and regards,
Mark

0 Mark L. over 2 years ago

TI__Expert 5870 points

Cao,

Could you clarify your inquiry further? Is the issue that the DPHY signal has a 500 mV amplitude when it should be 360 mV?

Regards,
Mark

0 cao qi over 2 years ago in reply to Mark L.

Intellectual 786 points

0 Mark L. over 2 years ago in reply to cao qi

TI__Expert 5870 points

Cao,

Can you verify TX_Swing is set to a valid value (eg. 0.28, 0.4, or 0.44)? Additionally, can you verify that the TX is driving into a load impedance in the Z_IDrange?

Regards,
Mark

0 cao qi over 2 years ago in reply to Mark L.

Intellectual 786 points

Hi Mark, we could not set different TX_swing value since there is only one buffer we can choose for 2.5gbps dphy_out signal from the Ibis model, could you specify how can we set the TX_Swing to a valid value? Regarding the load impedance, we confirm that it is in a proper range. Thanks,