[Openeeg-list] PC EEG system amplifier then analog to digital converter for larger frequency range with less amplification and filter and amp noize.

[joshua w. <jo...@gm...>]

PC EEG system amplifier then analog to digital converter for larger
frequency range with less amplification and filter and amp noize.
The system uses the 1168 instramentation amplifier a similar passive
low pas filter before the instramentation amplifier. The in. amp has a
gain of 10-12 using very percise resistors to keep the difference
small between channels & noize etc. The input lowpass is using carbon
resistors oni its inputs and 5K resistors to eliminate the need for
diodes.
The analog to digital converter ads1256 has been very difficult to
program... extreemly difficult.
I am begining to wonder if other more streaight forward to use chips
might be avalable giving similar features and operating specs.

ADC comparison 	Conversion rate 	Signal to noize ratio 	# of bits
	interface type 	works at low freq. 	dnl max lsb +/- 	inl max 	enob
	at freq?
ADS1255	30kSPS		24		yes	2	0.0003%	23	
ADS1256	30kSPS		24		yes				
									
ads1252	41ksps		24			1	0.0003%	19	
ADS1201	1Ksps		24			1	0.0015%	20	
									
LTC2400									
									
ads1251	20k		24			1	0.0002%	19	
ads1252	41k		24			1	0.0003%	19	

-- 
thanks for your time,
Joshua Wojnas
315 507 1070
My webpages on electronics/cybernetics:
http://pceeg.sourceforge.net/
http://opencircuits.com/Programmable_Chip_EEG