ADS1299: Question of Datasheet of ADS1299 .

Sangkyu Kim

Part Number: ADS1299

Hi.

I am setting my SPI clock.


Look at page 12 of the datasheet ,7.6 Timing Requirements: Serial Interface

I can't understand about tclk is longer than sclk.

What I understand is that tclk is peripheral clk of SPI .

Is it right?


And, I set Fs=16ksps.

But, SPI speed is not enough to fast to read.

I set my SPI clk= 2.25MHz and peripheral clk= 9MHz.


I am very confused because of tclk in the datasheet.

Would you tell me How can i set the SPI clk to operating 16ksps?

over 7 years ago

0 Ryan Andrews over 7 years ago

TI__Guru 66256 points

Hello Sangkyu,

Thanks for your post.

The CLK signal in the ADS1299 is the master clock of the device. From this clock, the ADS1299 produces the clock frequencies required by the analog and digital core. The SCLK is completely separate and used only as part of the SPI interface when communicating with the device.

The maximum SCLK period (tSCLK) can be calculated by equation 9 on page 39. As you can see, it is dependent on the data rate, master clock, and the number of channels to read.

Best Regards,

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ADS1299: Question of Datasheet of ADS1299 .