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AFE4490 Datasheet(PDF) 18 Page - Texas Instruments

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Part # AFE4490
Description  Integrated Analog Front-End for Pulse Oximeters
PDF  70 Pages
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

AFE4490 Datasheet(HTML) 18 Page - Texas Instruments

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V
= 2
DIFF
´ IPLETH ´
R
F
R
I
+ I
AMB
´
R
F
R
I
- ICANCEL ´ RG
Rf
Cf
Rf
Cf
Rx
VDIFF
Ri
Ri
Rg
Rg
I
PLETH + IAMB
I
CANCEL
Value of ICANCEL set using
the SPI interface.
I
CANCEL
AFE4490
SBAS602B – DECEMBER 2012 – REVISED FEBRUARY 2013
www.ti.com
Using the set value, the ambient cancellation stage subtracts the ambient component and gains up only the pleth
component of the received signal, as shown in Figure 29.
The amplifier gain is programmable to 1, 1.5, 2, 3, and 4.
Figure 29. Front-End (I-V Amplifier and Cancellation Stage)
The differential output of the second stage is VDIFF, as given by Equation 2:
Where:
RI = 100 kΩ,
IPLETH = photodiode current pleth component,
IAMB = photodiode current ambient component, and
ICANCEL = the cancellation current DAC value (as estimated by the host processor).
(2)
18
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Copyright © 2012–2013, Texas Instruments Incorporated
Product Folder Links: AFE4490



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