ADC34RF52: Unused input termination

Kazuki Itoh

Genius 9955 points

Part Number: ADC34RF52
Other Parts Discussed in Thread: LMK04832

Hi team,

Could you let me know how to terminate the unused input channels of ADC34RF52?

Best regards,

Kazuki Itoh

10 months ago

0 Chase W 10 months ago

TI__Mastermind 21870 points

Kazuki,

Please allow me a few days to look at this.

Chase

0 Chase W 10 months ago in reply to Chase W

TI__Mastermind 21870 points

Kazuki,

Input termination for unused inputs should look as below. Simply ac couple each input to ground through 0.1uF capacitor.

Thanks, Chase

0 Kazuki Itoh 9 months ago in reply to Chase W

TI__Genius 9955 points

Hi Chase-san,

Let me reword the question.
My customer is going to provide clock to CLKP/M and SYSREFP/M from LMK04832 LVPECL output (2000mVpp, 120Ω to GND) by ac coupling.
Is this okay?

Best regards,
Kazuki Itoh

+1 Chase W 9 months ago in reply to Kazuki Itoh

TI__Mastermind 21870 points

Functionally it will work no problem, performance of the ADC will be degraded by the LMK04832 but choosing LVPECL 2000mVpp is the best output format option for driving the clock input.

Because of the holidays, TI E2E™ design support forum responses will be delayed from Dec. 25 through Jan. 2. Thank you for your patience.

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ADC34RF52: Unused input termination