[sdiy] ultra low noise op amps

John Mahoney jmahoney at gate.net
Wed Sep 19 01:21:20 CEST 2007


Looking for the lowest distortion and noise? National Semi has some 
fairly new op amps (supposedly announced on July 23) with a mere 
0.00003% THD+noise, making for a dynamic range of 130dB.

Some additional specs:
	DC Gain Linearity Error: 0.000009% (quite good, no?)
	Input Offset Voltage  0.1mV (typ.)
	Input Bias Current  10nA (typ.)

That last number doesn't match the LT1013's "Guaranteed Offset 
Current" of 0.8nA. Am I comparing apples to apples?

Anyway, the amps are the LME49710, LME49720 and LME49740 (single, 
dual, quad) for rails up to +/-17V. Available in SOIC and DIP. 
There's also the LME48960 dual for +/-22V rails.

Here's a link to the quad's datasheet:
http://www.national.com/pf/LM/LME49740.html
--
john (not affiliated with NatSemi in any way!)


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