Precision Amps
Linear:
http://www.linear.com/
QUAD low noise
OpAmp (offset> 0.5uV, noise: 1.5uVpp, GBP: 2.5MHz, chopper freq: 3.3KHz, CMRR:
130dB, $9):
http://www.linear.com/pdf/10513fa.pdf
Microchip:
SINGLE low noise OpAmp (offset> 0.7uV, noise: 2uVpp, GBP: 2MHz, chopper freq:
375Hz, CMRR: 130dB, $2):
http://www.microchip.com/download/lit/pline/analog/linear/opamps/21463b.pdf
Analog Devices:
http://www.analog.com/
QUAD low noise OpAmp (offset: 1uV, noise: 51nV/rtHz, GBP: 1.5MHz, CMRR: 130dB,
$3):
http://www.analog.com/UploadedFiles/Data_Sheets/477744762246964129050077AD8571_2_4_a.pdf
SINGLE low noise OpAmp (offset: 1uV, noise: 0.5uVpp, GBP: 2.5MHz, CMRR: 140dB,
$1):
http://www.analog.com/UploadedFiles/Data_Sheets/48712118499402AD8628_b.pdf