DDC112: SBAA024 application report clarification

Art Mecina

Part Number: DDC112

Hello Guys,

Good day.

Our customer have concerns on Application Bulletin AB-131, "UNDERSTANDING THE DDC112’s CONTINUOUS AND NON-CONTINUOUS MODES" (SBAA024).

(1) In Figure 5 on page 5, t4 is given as 4548.0us. He suspect that 4548.0 is the number of clock cycles rather than the number of microseconds. He think the number of microseconds should be 454.8?

(2) Table VI shows minimum TINT for continuous mode to be 500us (assuming CLK = 10 MHz). Adding t13 and t14 to twice t12 totals 479.4us. So, Figure 12 would indicate a minimum TINT for continuous mode to be only 479.4us. Is the 500us minimum a rounded figure for 479.4us or is an additional 21.6us really needed to ensure a good continuous mode?

Thanks and regards,

Art

over 4 years ago

0 Art Mecina over 4 years ago

TI__Genius 16795 points

Hello,

For Question#2, please refer to device datasheet instead - https://www.ti.com/lit/gpn/ddc112

Thanks!

Art

0 TCT over 4 years ago in reply to Art Mecina

TI__Genius 11550 points

Hi Art,

Thanks for the post.

Thanks for pointing out the typo in the application note. The t₄ timing should be 454.8us, as shown in Figure 5 of the datasheet.
The recommended minimum integration period (T_INT) is 500us. Please refer to the following post for further information.

https://e2e.ti.com/support/data-converters/f/data-converters-forum/726386/ddc112-minimum-integration-time-in-continuous-mode---revisited

Thanks

-TC

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DDC112: SBAA024 application report clarification