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Old 30th March 2003, 03:22 PM   #1
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Default M5238 data sheets???

My CDP uses M5238 op amps in the I/V stage. Before replacing
them I would at least want to know what they actually are, but
I have failed to find data sheets for them. I know the pinout and
they seem to be low-noise JFET input, probably manufactured
by Mitsubishi (but they seem not to make op amps ).
I have also found a cross-reference table which suggest they
may be equivalent to NJM2082, for which I have data sheets.

Can somebody fill in with more data about these op amps, or
even supply (a link to) the data sheet?


Thanks in advance
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Old 30th March 2003, 04:02 PM   #2
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Only found this link:

http://www.geocities.com/SiliconVall....htm#Tigabelas

I know them and replacing them by another Fet input type like OPA2604 / OP275 / OPA2134 will be better for your ears.

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Old 30th March 2003, 04:20 PM   #3
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Thanks Jean-Paul,

that at least seconds the info that it is equivalent to NJM2082.
The low-noise claim I found somewhere seems not quite correct
then. Anyway, OPA2134 and OPA2604 are the ones I intended
to try for a start. I don't really know what parameters may be
most important for I/V-conversion?

BTW, it was listed as a Mitsubishi IC in your ref. too. Yet when
checking the web pages of Mitsubishi Semiconductors, they
seem not to make any op amps at all. Strange.
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Old 30th March 2003, 04:33 PM   #4
Netlist is offline Netlist  Belgium
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My 2 as a good digger

http://www.njr.co.jp/pdf/ae/ae04023.pdf
and a part of a schematic with M5283:
Attached Files
File Type: zip m5238.zip (47.8 KB, 116 views)
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Old 30th March 2003, 04:47 PM   #5
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Thanks Netlist.

I am afraid i already had the info you provided, however. I think
I did say I have the NJM2082 data sheet. I don't know how
close equivalents the two circuits are, though.
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Old 30th March 2003, 05:07 PM   #6
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For I/V I would use the fastest opamp I could find if it has to be an opamp. Maybe LM6172 will do at this spot ? It is bipolar though but offset is relative low.
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