PRR -
Thanks for the supportive post... Just to clear up a few things -- this is personal time for me - TI doesn't even know I venture into the newsgroups & forum domain. In other words, to cover myself, the opinions expressed in my posts are my own, not TI's.
First things on monday, I'll zap off part of your post to the app engineer for the PGA2310. I don't promise answers, I don't promise a timely response - in all fairness, these guys are usually running at 110% capacity as it is - answering DIY'ers questions will most probably take low priority.
I've read through your post, and there's one thing that strikes me - that people see the PGA2310 in many different parts of the circuit (some at the mic in, some before an ADC etc.)
The main idea behind the PGA23xx family was to use it after the DAC in the system as a volume control - so that volume control does not have to be done digitally with signal processing. The idea being that you're feeding it a line level signal that will most probably be attenuated. Some gain is possible on the device, although it's not it's main strength. I guess you could think of it like using a ferrari to pull a trailer... you could do it... but it's not really what it's designed for. :grin:
If your looking for a part that'll work within a gain circuit (such as a mic input on a desk etc.) then I strongly recommend you look at the PGA2500 digitally controlled Mic Pre. This little honey does 0db then 10dB through to 65dB in 1dB steps. This is the only device of it's kind on the market at the moment (unless you build it discretely... lots of relays etc).
Again, my apologies for seeming a little pushy-- I feel strangely 'proud' when we have a really great device that people want.
If you want to know what TI has in it's 'pro audio' offering (generally anything over 110dB SNR) then take a look at: http://focus.ti.com/lit/ml/szzb002a/szzb002a.pdf (Audio Solutions Selection Guide). There's a Pro Audio section in it that has details of what's available - no vapourware!
If you have any questions, then as usual, start a thread, and I'll answer in there.
Cheers
R
Thanks for the supportive post... Just to clear up a few things -- this is personal time for me - TI doesn't even know I venture into the newsgroups & forum domain. In other words, to cover myself, the opinions expressed in my posts are my own, not TI's.
First things on monday, I'll zap off part of your post to the app engineer for the PGA2310. I don't promise answers, I don't promise a timely response - in all fairness, these guys are usually running at 110% capacity as it is - answering DIY'ers questions will most probably take low priority.
I've read through your post, and there's one thing that strikes me - that people see the PGA2310 in many different parts of the circuit (some at the mic in, some before an ADC etc.)
The main idea behind the PGA23xx family was to use it after the DAC in the system as a volume control - so that volume control does not have to be done digitally with signal processing. The idea being that you're feeding it a line level signal that will most probably be attenuated. Some gain is possible on the device, although it's not it's main strength. I guess you could think of it like using a ferrari to pull a trailer... you could do it... but it's not really what it's designed for. :grin:
If your looking for a part that'll work within a gain circuit (such as a mic input on a desk etc.) then I strongly recommend you look at the PGA2500 digitally controlled Mic Pre. This little honey does 0db then 10dB through to 65dB in 1dB steps. This is the only device of it's kind on the market at the moment (unless you build it discretely... lots of relays etc).
Again, my apologies for seeming a little pushy-- I feel strangely 'proud' when we have a really great device that people want.
If you want to know what TI has in it's 'pro audio' offering (generally anything over 110dB SNR) then take a look at: http://focus.ti.com/lit/ml/szzb002a/szzb002a.pdf (Audio Solutions Selection Guide). There's a Pro Audio section in it that has details of what's available - no vapourware!
If you have any questions, then as usual, start a thread, and I'll answer in there.
Cheers
R