OPA4388: Quad Amp for SE to DE signal conversion prior to AD conversion

Leo Chow

Part Number: OPA4388
Other Parts Discussed in Thread: TMS320F28379D, OPA2320, OPA4350, OPA4322

Hi,

i'm looking into OPA4388 quad channel device for converting single ended(SE) signal into differential ended(DE) input prior to feeding the signal into 1Msps 16-bit SAR ADC. Is this a good device to implement SE to DE conversion? Will this be an overkill in terms of design specs? And assuming this device is suitable i presume i'll need 2x OPA4388 to get this done if i'm working with a quad channel 1Msps quad channel simultaneous ADC?

FYI I'm having SE input for analog side of board pumped into Delfino's 16-bit SAR ADC for conversion. Link to the discussion as follows. Thanks.

https://e2e.ti.com/support/microcontrollers/c2000/f/171/t/777758

Regards,

Leo

over 6 years ago

0 kai klaas69 over 6 years ago

Guru 140200 points

Hi Leo,

what exact 1Msps 16-bit SAR ADC are we talking about?

Kai

0 Leo Chow over 6 years ago in reply to kai klaas69

TI__Expert 3120 points

Hi Kai,
We are having SE input pumped into TMS320F28379D's onboard 16-bit SAR ADC for simultaneous sampling.

Regards,
Leo

0 Leo Chow over 6 years ago in reply to Leo Chow

TI__Expert 3120 points

Hi,
Can i have an update on this query? We are approaching design lockdown within next work week. Please advise. Thanks.

Regards,
Leo

0 Marek Lis over 6 years ago

TI__Guru 68711 points

Leo,
OPA4388 will NOT be fast enough to settle to within 16-bit resolution at 1Msps sampling rate. If you use the op amp in an inverting configuration, please take a look at OPA4350 (GBW of 38MHz) while for the non-inverting configuration you should use a zero-crossover op amp like OPA2320 or OPA4322 (20MHz).

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OPA4388: Quad Amp for SE to DE signal conversion prior to AD conversion