Re: TM4C Microcontrollers Forum: issue related to ADS850

sharath KN

sorry for improper data attached file is design of our ADC. clk we are providing through FPGA . As per datasheet At starting it has to auto calibrate write.?(considering this we are not controlling it through CAL pin.).so is it mandatory to sense the pulse of CAL pin. please specify.

thanks & regards

Sharath KN

ComAvia systems technologies PVT LTD.

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On Fri, Aug 28, 2015 at 7:08 PM, cb1- <bounce-1524606@mail.e2e.ti.com> wrote:

A Message from the TI E2E™ Community

cb1- replied to issue related to ADS850.

sharath KN
ADS850's "cal busy" pin is not getting low at any point of time

A client firm of ours has used this device - they have not noted this issue.

Is yours an "Eval Board?" That's always best - pcb layout of such complex devices is strict/demanding. Do describe how you've mounted to your pcb.

Two critical pins impact calibration: CBP1 & CBP2. Good quality 0.1µF (ceramic) mounted very close to those pins are required.

During the ADC's calibration procedure - all supplies & references "must" be solid/stable/adequate. Do yours meet that requirement, really?

You realize that "calibration" is (only - and potentially) completed after 32,775 clock cycles have been generated "after" you've properly pulsed (2 clock cycles) the CAL pin.

For an IC of this complexity - your single sentence presentation here seems (somehow) not quite up to task...

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