Hi All,
I'm completely new to the world of DAC's but am looking at building one to connect to my gainclone from my laptop. I have recently received samples of the PCM2707 and thought I would simply connect it to the USB and connect the analog output pins to a nice opamp such as a opa2134. However, every search I do everyone connects this chip to another DAC using the I2S interface. Is there a reason for this and what are the problems I will face if I go down the path of designing a DAC on my simple idea?
Thanks!
I'm completely new to the world of DAC's but am looking at building one to connect to my gainclone from my laptop. I have recently received samples of the PCM2707 and thought I would simply connect it to the USB and connect the analog output pins to a nice opamp such as a opa2134. However, every search I do everyone connects this chip to another DAC using the I2S interface. Is there a reason for this and what are the problems I will face if I go down the path of designing a DAC on my simple idea?
Thanks!
The performance of PCM2707 as a DAC isn't all that great, especially compared to its brother the PCM2702, which is the one everyone uses as a standalone DAC. Since the PCM2702 is so much better, the PCM2706/7 are primarily used as a USB->I2S (or SPDIF) interface.wiredmonkey said:Hi All,
I'm completely new to the world of DAC's but am looking at building one to connect to my gainclone from my laptop. I have recently received samples of the PCM2707 and thought I would simply connect it to the USB and connect the analog output pins to a nice opamp such as a opa2134. However, every search I do everyone connects this chip to another DAC using the I2S interface. Is there a reason for this and what are the problems I will face if I go down the path of designing a DAC on my simple idea?
Thanks!
There's nothing inherently wrong with the PCM2707's DAC, it works fine and it's just as easy to use as the PCM2702. Just consider:
PCM2707 THD+N into 10K - 0.012%
PCM2702 THD+N into 10K - 0.002%
PCM2707 SNR-A - 98dB
PCM2702 SNR-A - 105dB
PCM2707 channel separation - 70dB
PCM2702 channel separation - 103dB
Can't help you with that query, but PCM2702 if you're going to use it is SSOP28.wiredmonkey said:OH! That explains it I'll go get some pcm2702's now! I guess whilst I've started this thread would anyone know where I could get a TQFP 32 to DIP adapter in Australia?
You might also be interested in the AlienDAC, it's based on PCM2702 and kits and PCBs are available for purchase here (no affiliation).
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