Profesional to consumer line levels and back!

bans25 · 31st March 2005, 11:44 AM

HI all,

I am new to playing in the audio / video world

so forgive me if I ask dumb questions!

.

Currently I am using a TI AIC23 ( http://focus.ti.com/lit/ds/symlink/tlv320aic23b.pdf ) audio codec with consumer line level inputs and outputs.

What I need to do is make a PCB that will convert these I/O's to interface with Professional equipment (+4dbu).

So I need to PAD the input to the codec (Professional line level ----> Consumer line level) and then I need
to amplify the output of the codec (Consumer line level ----> Professional line level)

Of course this all needs to fit on a PCB 3" x 3" and be low noise!

anyone have any ideas?

Any suggestions are greatly appreciated

sync40 · 31st March 2005, 04:08 PM

What is exactly the final application of your system? I am designing with that same codec and a DSP. You should decide first if you want balanced signals -independently of level- which can be accomplished with only a few parts. Did you assemble the codec and it is operating yet?

sync40 · 31st March 2005, 04:12 PM

And of course it matters if your system has an analog frontend with bipolar supplies. You should do an ac-coupling to remove any dc offset and then apply a dc offset intentionally at 1.65 volts (the codec runs at 3.3 vdc).

bans25 · 18th April 2005, 12:01 AM

I am also interfacing this to a DSP TI DM642.

I have the first version of card running, but new requirments mean I have to support both Consumer, and Professional line levels (right now I am only Consumer). I do not have to support balanced, only unbalanced.

sync40 · 28th April 2005, 06:44 PM

Besides the consumer and pro levels I had discovered that the TLV320AIC23B is really a 16 bit device (I always suspect that because the 90 dB stated in the datasheet is too much low for an 24 bits device). The datasheet does not mention anywhere about the real resolution, but the TI page states as a 24 bit part. I understand that because it its a sigma delta the real resolution does not matter if the dynamic range can be acheived, but I would prefer that TI will be clear about this.

31st March 2005, 11:44 AM	#1
bans25 diyAudio Member Join Date: Mar 2005 Location: NH	Profesional to consumer line levels and back! HI all, I am new to playing in the audio / video world so forgive me if I ask dumb questions! . Currently I am using a TI AIC23 ( http://focus.ti.com/lit/ds/symlink/tlv320aic23b.pdf ) audio codec with consumer line level inputs and outputs. What I need to do is make a PCB that will convert these I/O's to interface with Professional equipment (+4dbu). So I need to PAD the input to the codec (Professional line level ----> Consumer line level) and then I need to amplify the output of the codec (Consumer line level ----> Professional line level) Of course this all needs to fit on a PCB 3" x 3" and be low noise! anyone have any ideas? Any suggestions are greatly appreciated

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Converting pro audio signal (1.23v) to consumer line level (0.31v)?	steve71	Solid State	26	19th November 2008 09:10 PM
Professional/consumer levels ADC and headroom	sync40	Digital Source	0	21st May 2005 03:55 PM
Professional to Consumer line level converion and back!	bans25	Analogue Source	2	2nd April 2005 09:44 PM
Professional to consumer line level conversion on PCB	bans25	Chip Amps	0	31st March 2005 11:44 AM
What are the correct output line levels for unbalanced & balanced?	Brian Guralnick	Digital Source	4	25th October 2002 06:27 PM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

31st March 2005, 04:08 PM	#2
sync40 diyAudio Member Join Date: Mar 2005 Location: Mexico	What is exactly the final application of your system? I am designing with that same codec and a DSP. You should decide first if you want balanced signals -independently of level- which can be accomplished with only a few parts. Did you assemble the codec and it is operating yet?

31st March 2005, 04:12 PM	#3
sync40 diyAudio Member Join Date: Mar 2005 Location: Mexico	And of course it matters if your system has an analog frontend with bipolar supplies. You should do an ac-coupling to remove any dc offset and then apply a dc offset intentionally at 1.65 volts (the codec runs at 3.3 vdc).

18th April 2005, 12:01 AM	#4
bans25 diyAudio Member Join Date: Mar 2005 Location: NH	I am also interfacing this to a DSP TI DM642. I have the first version of card running, but new requirments mean I have to support both Consumer, and Professional line levels (right now I am only Consumer). I do not have to support balanced, only unbalanced.

28th April 2005, 06:44 PM	#5
sync40 diyAudio Member Join Date: Mar 2005 Location: Mexico	Besides the consumer and pro levels I had discovered that the TLV320AIC23B is really a 16 bit device (I always suspect that because the 90 dB stated in the datasheet is too much low for an 24 bits device). The datasheet does not mention anywhere about the real resolution, but the TI page states as a 24 bit part. I understand that because it its a sigma delta the real resolution does not matter if the dynamic range can be acheived, but I would prefer that TI will be clear about this.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)