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AFE4490 Datasheet(PDF) 28 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) 28 Page - Texas Instruments

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ADC Conversion
Pulse Repetition Period
T = 1 / PRF
ADC Reset
ADC RDY Pin
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
0%
25%
50%
75%
ADC Data
ADC data 1 are
written into
register 42.
ADC data 5 are
written into
register 43.
ADC data 9 are
written into
register 44.
ADC data 13 are written into
register 45.
Register 42 and register 43
are written into register 46.
Register 44 and register 45
are written into register 47.
0%
17
18
19
20
0 T
1.0 T
NUMAV[7:0] + 1 =
0.25
Pulse Repetition Period
´
50 s
m
AFE4490
SBAS602B – DECEMBER 2012 – REVISED FEBRUARY 2013
www.ti.com
The number of samples to be used per conversion phase is specified in the CONTROL1 register (NUMAV[7:0]).
The user must specify the correct value for the number of averages, as described in Equation 3:
(3)
When the number of averages is '0', the averaging is disabled and only one ADC sample is written to the result
registers.
Note that he number of average conversions is limited by 25% of the PRF. For example, eight samples can be
averaged with PRF = 625 Hz, and four samples can be averaged with PRF = 1250 Hz.
Figure 38. ADC Data Without Averaging (When Number of Averages = 0)
28
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Copyright © 2012–2013, Texas Instruments Incorporated
Product Folder Links: AFE4490



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