TMS320F280049C: Could we use the SDFM to sampling 3M Hz sine wave analog signal？

Shaoxing Ke

Part Number: TMS320F280049C

Hi Experts,

Customer has the 3M Hz sine wave analog signal, and they want to sample at least 100 points in a period. Could we use the SDFM? Thanks.

over 2 years ago

0 Manoj Santha Mohan over 2 years ago

TI__Guru 55700 points

Shaoxing Ke said:
Customer has the 3M Hz sine wave analog signal, and they want to sample at least 100 points in a period. Could we use the SDFM? Thanks.

No, SDFM doesn't accept analog signal. It accepts only digital bitstream and clock signal.

0 Shaoxing Ke over 2 years ago in reply to Manoj Santha Mohan

TI__Expert 3590 points

How about add the AMC1306?

0 Vivek Singh over 2 years ago in reply to Shaoxing Ke

TI__Guru** 115881 points

Manoj Santha Mohan is on leave. Please expect reply before end of this week.

Vivek Singh

0 Manoj Santha Mohan over 2 years ago in reply to Vivek Singh

TI__Guru 55700 points

Shaoxing,

No, AMC1306 works on oversamping and noiseshaping @ 20 MHz with maximum Input bandwidth of 800 KHz.

Regards,

Manoj

0 Shaoxing Ke over 2 years ago in reply to Manoj Santha Mohan

TI__Expert 3590 points

Hi Manoj,

If 8 sigma delta samples are collected in parallel, can a 3M signal be collected? Thanks.

0 Manoj Santha Mohan over 2 years ago in reply to Shaoxing Ke

TI__Guru 55700 points

There is unfortunately no possible solution to sample a 3 MHz signal using SD-modulator and SDFM.

Regards,

Manoj

0 Shaoxing Ke over 2 years ago in reply to Manoj Santha Mohan

TI__Expert 3590 points

Thanks. Do we have any other device can solve it?

+1 Manoj Santha Mohan over 2 years ago in reply to Shaoxing Ke

TI__Guru 55700 points

Shaoxing,

To get 100 samples for a 3 MHz signal, you need to ADC which samples at 300 MSPS. This would give 100 samples / cycle.

https://www.ti.com/lit/ds/symlink/adc16dx370.pdf (This part can support upto 370 MSPS). But, how will you interface this with F280049? We don't have interface in F280049 which you can use to get digital output from this ADC device.

Regards,

Manoj

0 Shaoxing Ke over 2 years ago in reply to Manoj Santha Mohan

TI__Expert 3590 points

Hi Manoj,

How about the EMIF from the digital signal. Customer will also consider F2838x

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TMS320F280049C: Could we use the SDFM to sampling 3M Hz sine wave analog signal？