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AFE4403 Datasheet(PDF) 28 Page - Texas Instruments

Part # AFE4403
Description  AFE4404 Ultra-Small, Integrated AFE for Wearable, Optical, Heart-Rate Monitoring and Bio-Sensing
PDF  85 Pages
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Manufacturer  TI2 [Texas Instruments]
Direct Link  https://www.ti.com
Logo TI2 - Texas Instruments

AFE4403 Datasheet(HTML) 28 Page - Texas Instruments

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AFE4404
SBAS689D – JUNE 2015 – REVISED DECEMBER 2016
www.ti.com
Product Folder Links: AFE4404
Submit Documentation Feedback
Copyright © 2015–2016, Texas Instruments Incorporated
(1)
For signal names, see Figure 23.
The timing described in Table 11 minimizes the active time, thereby enabling the signal chain to be in the
dynamic power-down state for the maximum fraction of time. In this timing, the LED active phase overlaps with
the conversion phase corresponding to a previous LED. The ground bounce from the LED switching can couple
into the receiver and cause a small interference between one phase and the next. In most intended applications,
this bounce is not expected to cause any problems. However, if the lowest level of interference across phases
must be attained, the timing registers can be programmed as shown in Table 12.
Table 12. Sample Register Settings for Low Interference Across Phases
SIGNAL(1)
REGISTER FIELD
NO DIVISION OF CLOCK TO TIMING ENGINE CLOCK
(CLKDIV_PRF = 1)
TIME DURATION (µs)
REGISTER SETTING
PRF COUNTER
PRPCT
10000
39999
LED2
LED2LEDSTC
99.75
0
LED2LEDENDC
398
SLED2
LED2STC
74.75
100
LED2ENDC
398
ADCRST0
ADCRSTSTCT0
1.75
5600
ADCRSTENDCT0
5606
CONVLED2
LED2CONVST
115
5608
LED2CONVEND
6067
LED3
LED3LEDSTC
99.75
400
LED3LEDENDC
798
SLED3
ALED2STC\
LED3STC
74.75
500
ALED2ENDC\
LED3ENDC
798
ADCRST1
ADCRSTSTCT1
1.75
6069
ADCRSTENDCT1
6075
CONVLED3
ALED2CONVST\
LED3CONVST
115
6077
ALED2CONVEND\
LED3CONVEND
6536
LED1
LED1LEDSTC
99.75
800
LED1LEDENDC
1198
SLED1
LED1STC
74.75
900
LED1ENDC
1198
ADCRST2
ADCRSTSTCT2
1.75
6538
ADCRSTENDCT2
6544
CONVLED1
LED1CONVST
115.25
6546
LED1CONVEND
7006
SLED_AMB
ALED1STC
74.75
1300
ALED1ENDC
1598
ADCRST3
ADCRSTSTCT3
1.75
7008
ADCRSTENDCT3
7014
CONVLED_AMB
ALED1CONVST
115
7016
ALED1CONVEND
7475
PDNCYCLE
PDNCYCLESTC
7881.25
7675
PDNCYCLEENDC
39199



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