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Pulse oximetry measurements require the use of one wavelength each side of the 805nm isobestic point on the absorption spectra of adult haemoglobin. The DC and background noise is subtracted out, and the pulsed signals are then scaled. Two common methods to determine SPO2 are calculated and lookup tables. Extensive over-sampling, filtering and signal processing are needed to eliminate noise such as movement artifacts from small signals.
Application Notes
AN-724: ADuC702x Serial Download Protocol (pdf, 154,552 bytes)

AN-645: Interfacing an HD44780 Character LCD to a MicroConverter ® (uC014) (pdf, 100,250 bytes)
... There is a vast array of LCD displays available.Fortunately,a majority of them comply with the HD44780U standard.This standard refers to the LCD con
AN-645 Files (uC014)
(zip, 354,590 bytes) troller chip that accepts data from the MicroConverter and communicates with the LCD screen.
AN-313: Getting the Most from High Resolution D/A Converters (pdf, 724,091 bytes)

AN-241: Evaluation Board for the AD7710 High Resolution (24-Bits) Sigma-Delta A/D Converter (pdf, 493,088 bytes)

1.AMP

i.Precision Single-Supply Op Amp
AD8009
AD8655
ii.Instrumentation Amplifiers
AD522
AD8202
AMP03

iii.Current Sense and Difference Amplifiers
AD22057
ADM4073
AMP03

iv.Current Sense and Difference Amplifiers
AD22057
ADM4073
AMP03
2.Processor
i.MicroConverter®Products:PrecisionAnalog Microcontrollers
ADUC7019