MC3340 Electronic Attenuator substitute

RussellW · 12th May 2010, 06:29 PM

The Motorola MC3340 has been discontinued. It was simple and I happily used it.
Can anyone tell me if there is a substitute that is simple to use as a Voltage controlled amplifier or attenuator please.

Thank-you,
Russell WIlliams

consort_ee_um · 12th May 2010, 09:41 PM

You may be able to use the National LM13700 which uses a different principle but can be used in voltage controlled gain mode

My blog:
Consort3′s Blog

jackinnj · 13th May 2010, 01:34 AM

Simple, comparatively high noise and high THD%.

I've seen folks use a pot and a serial ADC to write a word to a digitally controlled pot, frankly if you're going to go this route you should consider something really great like the Texas Instruments PGA2310.

Maxim had some easily controllable digital pots.

Elvee · 13th May 2010, 07:14 AM

There are a number of european and japanese ICs having a similar function: the TDA1074 f.e.:
http://www.datasheetcatalog.org/data...ps/TDA1074.pdf

stratus46 · 13th May 2010, 07:37 AM

Quote:

Originally Posted by Elvee

There are a number of european and japanese ICs having a similar function: the TDA1074 f.e.:
http://www.datasheetcatalog.org/data...ps/TDA1074.pdf

Not exactly cutting edge.

G²

Elvee · 13th May 2010, 08:38 AM

Quote:

Originally Posted by stratus46

Not exactly cutting edge.

G²

OK, what's your "cutting edge" suggestion then?

jan.didden · 09:05 AM

Quote:

Originally Posted by Elvee

OK, what's your "cutting edge" suggestion then?

Some version of the SSM20xx series,

http://www.tenmilecreek.net/images/ssm2016/ssm2016.htm

or any of the VCA's from THAT corporation:

http://www.thatcorp.com/THAT_IC_Sele...ide.shtml#VCAs

jd

jackinnj · 13th May 2010, 11:55 AM

THAT Corp IC's are now carried by Mouser --

jackinnj · 13th May 2010, 01:11 PM

I have a couple dozen SSM2018 in PDIP if you're interested.

12th May 2010, 06:29 PM	#1
RussellW diyAudio Member Join Date: Apr 2009	MC3340 Electronic Attenuator substitute The Motorola MC3340 has been discontinued. It was simple and I happily used it. Can anyone tell me if there is a substitute that is simple to use as a Voltage controlled amplifier or attenuator please. Thank-you, Russell WIlliams

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12th May 2010, 09:41 PM	#2
consort_ee_um diyAudio Member Join Date: May 2004 Location: Hertfordshire	You may be able to use the National LM13700 which uses a different principle but can be used in voltage controlled gain mode My blog: Consort3′s Blog

13th May 2010, 01:34 AM	#3
jackinnj diyAudio Member Join Date: Apr 2002 Location: Llanddewi Brefi, NJ	Simple, comparatively high noise and high THD%. I've seen folks use a pot and a serial ADC to write a word to a digitally controlled pot, frankly if you're going to go this route you should consider something really great like the Texas Instruments PGA2310. Maxim had some easily controllable digital pots.

13th May 2010, 07:14 AM	#4
Elvee diyAudio Member Join Date: Sep 2006	There are a number of european and japanese ICs having a similar function: the TDA1074 f.e.: http://www.datasheetcatalog.org/data...ps/TDA1074.pdf

13th May 2010, 11:55 AM	#8
jackinnj diyAudio Member Join Date: Apr 2002 Location: Llanddewi Brefi, NJ	THAT Corp IC's are now carried by Mouser --

13th May 2010, 01:11 PM	#9
jackinnj diyAudio Member Join Date: Apr 2002 Location: Llanddewi Brefi, NJ	I have a couple dozen SSM2018 in PDIP if you're interested.