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Old 28th November 2003, 10:54 AM   #1
rho is offline rho  Belgium
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Question Volume control using a DS1802

I was reading the datasheet for the DS1802 and was rather disappointed that I could conclude it is not possible to use dual supply analog signals. I mean pos. and neg audio signals are not possible.

I need to use V+/2 as vitual ground for the audio signal?
So I apply Vaudio+(V+/2) at the high end of the resistor chain and AGND at the low end. This means I need caps at the input and output to get the DC-offset out of the audio signal.

Are there alternatives for this devices where I can use dual supplies? (±5V)
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Old 28th November 2003, 02:12 PM   #2
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Why don´t you use PGA2310 or PGA2311?
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Old 28th November 2003, 05:23 PM   #3
Bensen is offline Bensen  Belgium
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Hi neighbour,

I used the DS1802 three years ago in a preamp. I didn't had a problem with it. I just used the ground of the supply as the "-" and set a regulator (78l05) between the +15VDC from the rest of the electronics and the DS1802.

I don't use the IC anymore. Actually, I've almost not used the IC.
My plans changed in the middle off the progress. But I can say that it worked
So if you have any interests, let me now?

Ben
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Old 28th November 2003, 05:26 PM   #4
rho is offline rho  Belgium
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Because I didn't know about them.

I'll have a look at their datasheets. Also the mono AD5220BN50 looks nice to me.

Keep the alternatives comming.
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Old 28th November 2003, 05:31 PM   #5
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there are compatible devices to the PGA2310 / 11 from crystal or so- but the Burr Brown has the better sample policy...

take a look here: its no problem to use the +-5V device instead of +-15, MC control part will be the same. http://home.tu-clausthal.de/~tpa/PGA/index.html
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Old 28th November 2003, 05:45 PM   #6
rho is offline rho  Belgium
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Quote:
Originally posted by Bensen
Hi neighbour,

I used the DS1802 three years ago in a preamp. I didn't had a problem with it. I just used the ground of the supply as the "-" and set a regulator (78l05) between the +15VDC from the rest of the electronics and the DS1802.

I don't use the IC anymore. Actually, I've almost not used the IC.
My plans changed in the middle off the progress. But I can say that it worked
So if you have any interests, let me now?

Ben

From Bree? Nice maybe we can meet sometime .

I'm still in the design-fase. So looking onto alternatives is still very important.
In the meantime I found the application note 161. That discribes the way the DS1802 is best implemented. Doesn't look that bad but I'm not such a fan of adding DC first and then removing it again.
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Old 28th November 2003, 05:55 PM   #7
Bensen is offline Bensen  Belgium
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Certainly we can meet.

I've read the app note 161 to. So, what I was saying in my previous post was nonsense. If I used the ground (what I did) as "-", it wil clip everything under gound level

I sayed that I almost didn't used it, only for testing. Probably I was drunk when I did that. Probably to many Opsale's.

Remember, you can request free samples.

Ciao


Ben
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Old 28th November 2003, 06:02 PM   #8
Bensen is offline Bensen  Belgium
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Certainly we can meet.

I've read the app note 161 to. So, what I was saying in my previous post was nonsense. If I used the ground (what I did) as "-", it wil clip everything under gound level

I sayed that I almost didn't used it, only for testing. Probably I was drunk when I did that. Probably to many Opsale's.

Remember, you can request free samples.

Ciao


Ben
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Old 28th November 2003, 06:25 PM   #9
rho is offline rho  Belgium
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Hmmmmm Ops-Ale.....has been a long time.....

I already recieved the DS1802's.
I'm ordering the PGA2310 / 11 right now.
Next up is the DS1267-050 from Dallas.
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Old 29th November 2003, 01:07 AM   #10
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Does anyone know what happens when a DS1802 is powered down? Does it min or max the attenuation? Does the zero crossing cease to work?

:)ensen.
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