AM2634-Q1: What' the parameters of the ADC input module

Shuqing Zhou

Part Number: AM2634-Q1

Hi team,

I ask this for my customer.

My customer needs parameters of the ADC input models to caculate the Acquisition Window Duration of the ADCSOC, but we don't find the related information in datasheet or TRM, could you help to check this for every ADC input channel?

BRs

Shuqing

24 days ago

0 Kudra Baruti 20 days ago

TI__Prodigy 460 points

Hi Shuqing,
The AM263x datasheet and TRM don't currently publish the ADC input model values (Cp, Ron, Ch). I'm checking with the product team and will follow up here with the AM263x numbers, including any per-pin differences.

In the meantime, the customer can size the window with:
τ = Rs·Cp + (Rs + Ron)·Ch
t_acq ≥ ln(2^12 / 0.5) · τ ≈ 9 · τ (12-bit, ±0.5 LSB settling)
The sample window is set in SYSCLK cycles (1 to 512), so at 200 MHz each step is 5 ns. The datasheet minimum is 75 ns, or 15 cycles.

Best regards,

.Kudra

0 Shuqing Zhou 19 days ago in reply to Kudra Baruti

TI__Expert 4375 points

Hi Kudra,

looking forward to your update

Kudra Baruti said:
I'm checking with the product team and will follow up here with the AM263x numbers, including any per-pin differences.

BRs

Shuqing

0 Kudra Baruti 12 days ago in reply to Shuqing Zhou

TI__Prodigy 460 points

Please see this thread for guidance on what to use:

AM2634-Q1: ADC Input Capacitance - Arm-based microcontrollers forum - Arm-based microcontrollers - TI E2E support forums