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Altera_Forum's avatar
Altera_Forum
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13 years ago

Possible low frequency (<400kHz) capability on the THDB_ADA board?

I know there is a way to desolder a transformer on the DAC part of the THDB_ADA board, to achieve low frequency single ended output. Can a similar thing be done to the ADC circuitry in order to...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
13 years ago

I suggest to refer to the AD9248 datasheet for possible solutions. There's an option to use the ADC in single ended configuration, although it involves a certain performance degradation. It would need an additional voltage divider bypassing the +input to Vcc/2 and a large input coupling capacitor, e.g. 10 µF ceramics.

My personal favourite is a DC capable fully differential amplifier as single ended to differential converter, as used in the AD9248 evaluation board, the schematic is also included in the datasheet.