ADS4149EVM: MSB, CMOS MODE

Hi Sung
We are looking into your questions. Someone will respond soon.
Jim B

Sung Young,

Your post is very confusing. Are you using the ADC with a TSW1400EVM or a TSW1200EVM? If it is the TSW1200EVM, this board is no longer supported and you must use the TSW1400EVM. Do you have the ADC setup for serial or parallel SPI interface? If it is setup for serial SPI, how are the ADC registers configured? If setup for parallel SPI, did you press the board reset after power up? What sample rate is the ADC running at? What is the IF frequency and amplitude?

Regards,

Jim

Thank you for giving the answer.

I'm using ADS4149EVM for adc.

I used with TWS1400EVM for getting output data and I scceed to get a date with TWS1400EVM.
However, what I real purpose is getting data through MSB port not through TWS1400EVM.

So I've been controling TWS1400EVM with USB to change the mode.
please let me know what I shoud change in SPI and Borad to setup.


thank you.

Jim

Thank you for your answer.

I'm trying to what you told me. I just removed RN3, RN4, RN5 and RN6 and installed the buffer U7. But I still have some problem. I can not understand how I should set the ADC to output CMOS data and else. Could you tell me more detaile about how I set the ADS4149 EVM for change the output date?

SH3 D0_D1-P -->>> D0
SH3 D0_D1-M -->>> D1
SH3 D2_D3-P -->>> D2
SH3 D2_D3-M -->>>D3
... -->>> ....
(LVDS) (CMOS)

THAT IS WHAT I REALY WANT TO GET FOR THE OUTPUT DATA.

Sung Young,

Sung,

If you are using parallel SPI mode, set the jumpers according to the User's Guide to set the part in CMOS output mode. Next, apply power and a send a clock source to J19, and then issue a rest. If using serial SPI mode, after power  and clock are present, write to the corresponding register to issue a reset then set the output to CMOS mode. Using a scope probe, verify that the data out of the ADC is toggling and is at the correct voltage level. After this, do the same test but at the buffer output. If you are still having problems, send me the jumper settings used by your board. If you are using the GUI, send screen shots of the GUI settings.

Regards,

Jim 

Set your jumpers as follows for parallel CMOS output mode:

J2- shunt on pins 3-4 and 15-16

JP9 1-2

JP18 1-2

JP11, JP16, JP15 no shunt

JP12 1-2

JP4 1-2

JP8 1-2

JP10 2-3

JP7 1-2

JP14 1-2

JP13 1-2

JP17 1-2

JP19 1-2

JP3 installed.

This gives a CMOS output on our EVM. Press switch SW1 after power and clock is present.

Regards,

Jim

Thanks again.

We just follow what you told me. But it didin't work.

here are some picture which is our situation and condition.

POWER SUPPLY USE CH2

and I still wander how much current will folw at this EVM. 

And here is one more thing that I confuse that you told me J2- shunt on pins 3-4 and 15-16

but J2 has only 1 to 8.

Here is only 8 pin. isn't this correct?

clk : 10MSPS, 1Vpp  

INPUT: 50KHz ,1Vpp

Thank you so much.

And we still get output with conplementary data.

It is looks like this.

Thank you.

Sung,

Move the jumper from J2 from pins 3-4 to 5-6. This will change the output from CMOS 2's comp to CMOS offset binary per the silkscreen markings on the board.

Regards,

Jim

Thank you.

we gat binary data finally.

But the results are unsatisfactory.

I put a sine wave into the input signal, but the result is as follows.

and here is the contition of this result.

 that is power supply.

and this picture shown the input and clk. the upside of picture shown

input : 2MHz , 0.3Vpp 0v offset.

clk : 20MHz , 1Vpp ,0V offset.

what is the problem?

thank you.

we thought that was binary code, but it wasn't. that only because delay time at 3.3V. when we change the Voltage just little , it gose back for comp.

Jim.

I gat the data which is look like 2' complement data, but I'm not sure about it.
So I want to know what is difference between offset binary data and 2' complement data.

I want to get the offset binary data , and also I want to know how to change from 2' complement data to offset binary data.

Thank you