LME49710 missing data in datasheet

peranders · 1st April 2008, 08:26 PM

The LME49710 caught my interest but the datasheet has no data about open loop gain and other characteristics concerning gain. Anyone who know more than I? I have emailed National also, no reply yet.

deuginthesky · 2nd April 2008, 01:23 PM

http://www.national.com/ds.cgi/LM/LME49710.pdf

125dB minimum, 140dB typical.

peranders · 2nd April 2008, 01:52 PM

I'm afraid, this data is totally unimportant when it comes to judge stability. How is the phase margin at 10-0 dB open-loop gain?

At which gain is the phase margin 135, 180 degrees? Pretty important knowledge, I think.

As you all can see, there are lot's (world record?) of distortion figures but what about frequency characteristics?

deuginthesky · 2nd April 2008, 02:43 PM

Have a better look at the datasheet, read it completly, all is indicated.
You have figures with THD vs frequency etc

I use the LME49710, I love it.

peranders · 2nd April 2008, 04:12 PM

Can you point out phase properties I would be greatful. Can't find any. Can't find any open-loop graph. Can you?

waltzingbear · 3rd April 2008, 03:55 AM

Yea, I was disappointed in the lack of meaningful graphs.

However, I went ahead and tried them in a Quad Eight Eq and they kept singing sweetly at +16 at 20Khz. Not easy.

They are noted as unity gain stable in the text.

other than that you'll have to measure it yourself.

Alan Garren
Waltzing Bear Audio

Conrad Hoffman · 3rd April 2008, 04:28 AM

You're right, no bode plots. Still, used in any normal circuit with proper bypassing and layout, they're hard to beat.

peranders · 3rd April 2008, 04:39 AM

It's good to know what National actually garantees.

BrianL · 3rd April 2008, 05:31 AM

This is, IMNSHO, one of the poorer occidental datasheets I have seen. All the distortion graphs are essentially meaningless and 3 or 4 would have sufficed to get the point across. It is hard to determine from the spec table which, of any, specs are actually measured (notes 7.8). Sure, there are mins and maxes, but there are a bunch of weaselwords that essentially say "we may not actually test any of this stuff".

Still, the family is supposed to be good and I look forward to trying them.

peranders · 3rd April 2008, 07:02 AM

It has come to my knowledge that LM4562 is a dual LME49710 but why have so different numbers?

1st April 2008, 08:26 PM	#1
peranders Electrons are yellow and more is better! diyAudio Member Join Date: Apr 2002 Location: Göteborg, Sweden Blog Entries: 4	LME49710 missing data in datasheet The LME49710 caught my interest but the datasheet has no data about open loop gain and other characteristics concerning gain. Anyone who know more than I? I have emailed National also, no reply yet. __________________ /Per-Anders (my first name) or P-A as my friends call me

2nd April 2008, 01:52 PM	#3
peranders Electrons are yellow and more is better! diyAudio Member Join Date: Apr 2002 Location: Göteborg, Sweden Blog Entries: 4	I'm afraid, this data is totally unimportant when it comes to judge stability. How is the phase margin at 10-0 dB open-loop gain? At which gain is the phase margin 135, 180 degrees? Pretty important knowledge, I think. As you all can see, there are lot's (world record?) of distortion figures but what about frequency characteristics? __________________ /Per-Anders (my first name) or P-A as my friends call me

2nd April 2008, 04:12 PM	#5
peranders Electrons are yellow and more is better! diyAudio Member Join Date: Apr 2002 Location: Göteborg, Sweden Blog Entries: 4	Can you point out phase properties I would be greatful. Can't find any. Can't find any open-loop graph. Can you? __________________ /Per-Anders (my first name) or P-A as my friends call me

3rd April 2008, 04:28 AM	#7
Conrad Hoffman diyAudio Member Join Date: Mar 2007 Location: Canandaigua, NY USA	You're right, no bode plots. Still, used in any normal circuit with proper bypassing and layout, they're hard to beat. __________________ I used to be an audiophool like you but then I took an arrow to the knee.

3rd April 2008, 04:39 AM	#8
peranders Electrons are yellow and more is better! diyAudio Member Join Date: Apr 2002 Location: Göteborg, Sweden Blog Entries: 4	It's good to know what National actually garantees. __________________ /Per-Anders (my first name) or P-A as my friends call me


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2nd April 2008, 01:23 PM	#2
deuginthesky diyAudio Member Join Date: Jan 2007 Location: europe	http://www.national.com/ds.cgi/LM/LME49710.pdf 125dB minimum, 140dB typical.

2nd April 2008, 02:43 PM	#4
deuginthesky diyAudio Member Join Date: Jan 2007 Location: europe	Have a better look at the datasheet, read it completly, all is indicated. You have figures with THD vs frequency etc I use the LME49710, I love it.

3rd April 2008, 03:55 AM	#6
waltzingbear diyAudio Member Join Date: Nov 2005 Location: Portland. Oregon	Yea, I was disappointed in the lack of meaningful graphs. However, I went ahead and tried them in a Quad Eight Eq and they kept singing sweetly at +16 at 20Khz. Not easy. They are noted as unity gain stable in the text. other than that you'll have to measure it yourself. Alan Garren Waltzing Bear Audio

3rd April 2008, 05:31 AM	#9
BrianL diyAudio Member Join Date: Mar 2002 Location: USA	This is, IMNSHO, one of the poorer occidental datasheets I have seen. All the distortion graphs are essentially meaningless and 3 or 4 would have sufficed to get the point across. It is hard to determine from the spec table which, of any, specs are actually measured (notes 7.8). Sure, there are mins and maxes, but there are a bunch of weaselwords that essentially say "we may not actually test any of this stuff". Still, the family is supposed to be good and I look forward to trying them. __________________ bel

3rd April 2008, 07:02 AM	#10
peranders Electrons are yellow and more is better! diyAudio Member Join Date: Apr 2002 Location: Göteborg, Sweden Blog Entries: 4	It has come to my knowledge that LM4562 is a dual LME49710 but why have so different numbers? __________________ /Per-Anders (my first name) or P-A as my friends call me

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