Volume control using a DS1802

rho · 28th November 2003, 10:54 AM

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)

till · 28th November 2003, 02:12 PM

Why don´t you use PGA2310 or PGA2311?

Bensen · 28th November 2003, 05:23 PM

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

rho · 28th November 2003, 05:26 PM

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.

till · 28th November 2003, 05:31 PM

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

rho · 28th November 2003, 05:45 PM

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.

Bensen · 28th November 2003, 05:55 PM

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

Bensen · 28th November 2003, 06:02 PM

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

rho · 28th November 2003, 06:25 PM

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.

purplepeople · 29th November 2003, 01:07 AM

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.

28th November 2003, 10:54 AM	#1
rho diyAudio Member Join Date: Sep 2003 Location: Peer, Belgium	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)

29th November 2003, 01:07 AM	#10
purplepeople diyAudio Member Join Date: Mar 2003 Location: London, Ontario, Canada	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. __________________ Those who claim to be making history are often the same ones repeating it.

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28th November 2003, 02:12 PM	#2
till Banned Join Date: Apr 2002 Location: Germany, Clausthal	Why don´t you use PGA2310 or PGA2311?

28th November 2003, 05:23 PM	#3
Bensen diyAudio Member Join Date: May 2003 Location: Belgium, Limburg, Bree	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

28th November 2003, 05:26 PM	#4
rho diyAudio Member Join Date: Sep 2003 Location: Peer, Belgium	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.

28th November 2003, 05:31 PM	#5
till Banned Join Date: Apr 2002 Location: Germany, Clausthal	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

28th November 2003, 05:55 PM	#7
Bensen diyAudio Member Join Date: May 2003 Location: Belgium, Limburg, Bree	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

28th November 2003, 06:02 PM	#8
Bensen diyAudio Member Join Date: May 2003 Location: Belgium, Limburg, Bree	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

28th November 2003, 06:25 PM	#9
rho diyAudio Member Join Date: Sep 2003 Location: Peer, Belgium	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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