[sdiy] cs4344 DAC output stage

[julian schmidt]

Hello Jay,

Good to know about the "stereo" naming convention.
I thought stereo DAC was refering to its 2 channel nature ;)
so the cs4344 i'm going to use is a '10-pin, 24-Bit, 192 kHz Stereo D/A 
Converter'
The data sheet mentions analog filtering at the output of the chip.

So I should be fine connecting it without an additional opamp as long as 
the output volume is high enough (as Richie stated in the other answer.)

Thanks to both of you for shedding some light onto this subject.

julian

Am 13.09.2012 17:54, schrieb Jay Schwichtenberg:
> Julian,
>
> It depends on the DAC.
>
> There are two main types of DACs now days. There are media player and stereo
> (not 2 channels but something you plug into your stereo) ones.  Media player
> stuff usually does not have any, they are made to drive headphones. A small
> power amp is in the chip and they typically drive the headphones thru a
> capacitor. Ones that you use in the stereo will typically have an active
> filter (using op-amps) to roll of the high end for aliasing. For 44.1 KHz
> sample rate that is somewhere between 20 KHz and 22 KHz. There might also be
> a driver circuit after the filter. You can also find hybrids that have both
> built in. These are usually used in home theater systems.
>
> Look at a bunch of data sheets from Cirrus, Burr Brown/TI, AKM to get some
> ideas. There use (don't know if there still is) to be a lot of app notes out
> there for filter calcs, demo board schematics, interfacing and other things.
>
> Jay
>
> -----Original Message-----
> From: synth-diy-bounces at dropmix.xs4all.nl
> [mailto:synth-diy-bounces at dropmix.xs4all.nl] On Behalf Of julian schmidt
> Sent: Thursday, September 13, 2012 8:30 AM
> To: Synth DIY
> Subject: [sdiy] cs4344 DAC output stage
>
> Hello all,
>
> I'm designing a cortex M4 based audio/synth board using the cs4344 DAC
> and a cs5343 ADC.
> As i'm new to designing with DAC/ADCs here's a question.
>
> Is there an opamp needed for the DAC output stage?
> I've seen opamp output stages in quite a few designs using different
> kinds of DACs, but the datasheet for the cs4344 just states some R/C
> filters after the dac output as reference design.
>
> cheers,
> julian
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