MSP430F6735A: SD24 Differential Input, range of Vi,A+ and Vi,A-

Min Ge

Part Number: MSP430F6735A

Hello,

I am using SD24 with external VREF=1.25V, AVCC=3.0V. My Differential input is 0~1V. Vi,V- = 1.25V. Vi,A+=1.25~2.25V, and is greater than VREF but still lerss than AVCC. Would this design work?

Thanks.

Min

over 3 years ago

0 James Evans over 3 years ago

TI__Mastermind 49692 points

Hello Min,

According to Table 5-35 in the datasheet, the minimum and maximum differential inputs should be +/-VREF/GAIN. However, for the performance specified in the datasheet, it's recommended that you stay within 0.8*(+/-VREF/GAIN).

Assuming your GAIN = 1, this means that you should limit your differential inputs to +/-1 V when using VREF = 1.25 V.

Regards,

James

0 Min Ge over 3 years ago in reply to James Evans

Prodigy 20 points

Hi James,

Thanks for your reply.

Yes, my differential input between Vi+ and Vi- is within 1.0V, and I am not worrying this. But my Vi+ vs GND is 1.25~2.25 and out of +VREF. I am wondering whether this matters?

Thanks,

Min

0 James Evans over 3 years ago in reply to Min Ge

TI__Mastermind 49692 points

The absolute maximum and common-mode input voltage ranges can also be found in Table 5-35 in the datasheet.

Regards,

James

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MSP430F6735A: SD24 Differential Input, range of Vi,A+ and Vi,A-