CHANGSTAR: Audiophile Headphone Reviews and Early 90s Style BBS

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Author Topic: Changstar Exclusive: O2 amp/DAC in development - Pirate Wants and Needs?  (Read 1155 times)

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tomscy2000

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Re: Changstar Exclusive: O2 amp/DAC in development - Pirate Wants and Needs?
« Reply #20 on: January 18, 2015, 05:22:35 PM »

A Vout DAC chip like the ES9023 or PCM5102A is going to have noise floor modulation due to the embedded charge pump, limiting its performance.

TI recently released the PCM5242, which is a PCM5102 with embedded ROM/DSP, as well as differential voltage output, rather than single pole output. This makes it similar to the Wolfson chips, except with the added benefit of a line driver. Differential output will help with cancelling out some of the output noise, which makes the performance ceiling of this chip package higher, while remaining pretty affordable. A designer still needs not design an I/V converter (lowering complexity and BOM cost), and can directly hook up a differential input IC for the headamp, further simplifying BOM cost.

The embedded ROM allows for custom design of digital filters and oversampling routines, and can be selectively flashed for performance changes, like an FPGA, except with a less computational power.

A platform like this would end up more flexible than the ES9023 used right now. TI even has a reference design based around it and the TPA6120A2 (though I wouldn't recommend this design, as it has problems, OI being just one of them).

http://www.ti.com/lit/df/tidrbs8/tidrbs8.pdf
http://www.ti.com/lit/ug/tidu639/tidu639.pdf
http://www.ti.com/tool/tida-00385

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funkmeister

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Re: Changstar Exclusive: O2 amp/DAC in development - Pirate Wants and Needs?
« Reply #21 on: February 03, 2015, 02:15:13 PM »

To serve market demands, get the O2/ODAC combo. Eventually the market will come around to the CS community perspective, but not for a while.
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