ADS127L01: Clock parallel capability

Kami Huang60

Part Number: ADS127L01

Dear Sir/Ms.

Is ADS127L01 can be stacked up 4 pcs? The other question is what's the input current needed of Pin CLK and START? My customer will use fan out current 3mA oscillator?

Best Regards,

Kami Huang

over 6 years ago

0 Collin Wells over 6 years ago

TI__Guru 64045 points

Hello Kami,

The primary support engineer for this product is out of the office returning in a day or two. He will respond when he's back.

0 Keith Nicholas over 6 years ago in reply to Collin Wells

TI__Mastermind 47090 points

Hello Kami,

You can connect 4 ADS127L01 devices together provided the clock oscillator can drive the total load capacitance.

The input leakage current for both CLK and START pins is +/-10uA. The main load presented by the CLK pin will be the input capacitance, which the IBIS model shows about 1.5pF worst case. Most clock oscillators are specified from 15pF to 50pF of total load capacitance.

4 ADS127L01 clock inputs will total about 6pF of capacitance, plus any external board capacitance, which can be around 1pF/cm or higher depending on the board design.

Regards,
Keith Nicholas
Precision ADC Applications

0 Kami Huang60 over 6 years ago in reply to Keith Nicholas

Genius 3830 points

Hello Keith,

How to connect four in parallel, I am afraid that the customer has made a mistake. My experience is not as rich as you are.
Can I ask the customer to draw a simple picture and then pass it on to you?

Best Regards,

Kami Huang

0 Keith Nicholas over 6 years ago in reply to Kami Huang60

TI__Mastermind 47090 points

Hi Kami,

Sure, you can post additional information and I will take a closer look at it.

Thanks,

Keith

0 Kami Huang60 over 6 years ago in reply to Keith Nicholas

Genius 3830 points

Hello Keith,

Thanks for your kindly help. I check with customer and RD just RFQ . Once he drawn schematic, RD will send schematic to us and I will need your help.

Thanks for your kindly help.

Kami Huang

0 Keith Nicholas over 6 years ago in reply to Kami Huang60

TI__Mastermind 47090 points

Hi Kami,

I have not heard from you in a while. I am going to close this e2e thread. If you do get additional information, please reply to this thread or create a new post and I will review.

Thank you.

Regards,
Keith

0 Kami Huang60 over 6 years ago in reply to Keith Nicholas

Genius 3830 points

Hello Keith,

OK. I still not get RD's schematic.

Best Regards,

Kami Huang

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ADS127L01: Clock parallel capability