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AFE4490 Datasheet(PDF) 14 Page - Texas Instruments

No. de pieza AFE4490
Descripción Electrónicos  AFE4404 Ultra-Small, Integrated AFE for Wearable, Optical, Heart-Rate Monitoring and Bio-Sensing
PDF  85 Pages
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Fabricante Electrónico  TI2 [Texas Instruments]
Página de inicio  https://www.ti.com
Logo TI2 - Texas Instruments

AFE4490 Datasheet(HTML) 14 Page - Texas Instruments

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Rf
Cf
SLED1
CONVLED1
SLED_AMB
CONVLED_AMB
SLED2
CONVLED2
SLED2_AMB, SLED3
CONVLED2_AMB,
CONVLED3
Analog-to-Digital
Converter
Transimpedance Amplifier
Switched RC Filter
CSAMP1
CSAMP2
CSAMP3
CSAMP4
ADCRST
(1)
CBUF
Buffer
14
AFE4404
SBAS689D – JUNE 2015 – REVISED DECEMBER 2016
www.ti.com
Product Folder Links: AFE4404
Submit Documentation Feedback
Copyright © 2015–2016, Texas Instruments Incorporated
8.3 Feature Description
8.3.1 TIA and Switched RC Filter
The receiver input pins (INP, INM) are meant to be connected differentially to a photodiode. The signal current
from the photodiode is converted to a differential voltage using a transimpedance amplifier (TIA). The TIA gain is
set by its feedback resistor (Rf) and can be programmed from 10 kΩ to 2 MΩ. The transimpedance gain between
the input current and output differential voltage of the TIA is equal to 2 × Rf. At the output of the TIA is a switched
RC filter. There are four parallel instances of the filter, each of which are connected to the TIA output signal
during one of four sampling phases.
The signal chain is kept fully differential throughout the receiver channel in order to enable excellent rejection of
common-mode noise as well as noise on power supplies. For simplicity, the scheme with the four parallel filters
is shown in Figure 23 for a single-ended representation of the signal chain. The ADCRST signal corresponds to
the collection of active phases of four ADCRST pulses: ADCRST0, ADCRST1, ADCRST2, and ADCRST3.
NOTE: For simplicity, this circuit is shown in single-ended format.
(1)
ADCRST corresponds to ADCRST0, ADCRST1, ADCRST2, or ADCRST3.
Figure 23. Four Sampling and Conversion Phases Diagram



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