TFP410: Voltage-divider circuit for Vref

NAOKI AOYAMA

Guru 11215 points

Part Number: TFP410

Hello,

Our customer will design a voltage-divider circuit for the VREF of the TFP410.

The customer want to know the impedance of the VREF pin.

Is it same as IIH and IIL?

I checked the datasheet of the TFP410.

It is mentioned "NOTE : R13=91k for Low-Swing input signal level" at P27 figure 33 on the datasheet.

Is It correct?

R1=33k , R13=91k and VCC=3.3V then Vref=2.4V.

Best Regards,

Naoki Aoyama

over 6 years ago

0 Joel Jimenez0 over 6 years ago

TI__Mastermind 18655 points

Hello Naoki,

I'm reviewing your question. I'll be back with my comments shortly.

Regards

0 NAOKI AOYAMA over 6 years ago in reply to Joel Jimenez0

Guru 11215 points

Hello Joel,

Thank you for your reply.
I will be waiting for your answer.

Regards,
Naoki Aoyama

0 Joel Jimenez0 over 6 years ago in reply to NAOKI AOYAMA

TI__Mastermind 18655 points

It seems to be a mistake since to select the low-swing mode, the VREF must be 0.55 to 0.95 V. The correct condition would be having R1 = 91kOhms and R13 = 33kOhm.

Regards,
Joel

0 NAOKI AOYAMA over 6 years ago in reply to Joel Jimenez0

Guru 11215 points

Hi Joel,

Thank you for your reply.
Could you give me the information of the impedance of Vref pin?

Regards,
Naoki Aoyama

0 NAOKI AOYAMA over 6 years ago in reply to Joel Jimenez0

Guru 11215 points

Hello Joel,

I will suggest the customer to use the total resistance is less than 100kohm.

Thanks,
Naoki Aoyama

Interface

Interface forum

TFP410: Voltage-divider circuit for Vref