PGA400 Noise

Mario Meli

I use the GUI with PGA400EVM. With high gain (S1 51 and S2 25.06) i have high noise (600 Bit peak peak).

Is this normal? Is there any detailed information about noise performance of the PGA400?

5734.ESFR.txt

;ESFR
91 PSMON1,00
92 PSMON2,00
93 AFEDIAG,00
94 MICRORESET,00
A1 SEN1GAIN,FF
A2 SEN2GAIN,00
A3 SEN1OFF1,FE
A4 SEN1OFF2,66
A5 SEN2OFF1,00
A6 SEN2OFF2,00
A7 CAPSEN,00
A9 SENCTRL,00
AA GPIO STRG,00
AB CTOV CLK COUNT,00
B1 ADCMSB,00
B2 ADCLSB,31
B3 LD DEC,00
B7 DAC1MSB,00
B9 DAC1LSB,00
BA DAC2MSB,00
BB DAC2LSB,00
BC DECCTRL,00
C0 IC OC CTRL,00
C1 IC1MSB,00
C2 IC1LSB,00
C3 IC2MSB,00
C4 IC2LSB,00
C5 OC1MSB,00
C6 OC1LSB,00
C7 IC OC GPIO,00
C9 OC2MSB,00
CA OC2LSB,00
CB FRTMSB,00
CC FRTLSB,00
D3 COMBUF,00
D4 DI CTRL,00
D5 EN CTRL,00
D6 EN CTRL2,00
D7 RAM MBIST ST,00
E1 EE STATUS,00
E2 EE CTRL,00
EOF

over 9 years ago

0 Clancy Soehren over 9 years ago

TI__Mastermind 23810 points

Mario,

Thank you for attaching your register settings. What jumpers are you using on the EVM for input selection? Have you made any board modifications?

Also, for your final project, are you planning on using the QFN or WCSP package of the PGA400?

Thanks,

-Clancy

0 Mario Meli over 9 years ago in reply to Clancy Soehren

Prodigy 45 points

Clancy,

I use the default jumper setting according to figure 2-1 in SLDU010A. No modification.

We planed to use WCSP.

We need a noise level of less than 40 Bit @ highest Gain. Is this possible?

Regards

Mario

0 Mario Meli over 9 years ago in reply to Mario Meli

Prodigy 45 points

Would it be possible to answer my question today?

Thanks

Mario

0 Clancy Soehren over 9 years ago in reply to Mario Meli

TI__Mastermind 23810 points

Mario,

Thanks for your patience. I found some data that might be useful, but I need to work through it a little more to prepare some numbers. What I have looks at 800 ADC counts across temperature and input settings and looks at the standard deviation. This isn't specifically looking at how the gain stages affect resolution, but it should be a good starting point. Please give me until the end of the week to get this ready.

Thanks,

-Clancy

0 Mario Meli over 9 years ago in reply to Clancy Soehren

Prodigy 45 points

Clancy,

I still waiting for more information.

Regards,

Mario

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PGA400 Noise