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ADPD144RI Datasheet(PDF) 11 Page - Analog Devices

Part # ADPD144RI
Description  PPG Optical Sensor Module with Integrated Red/IR Emitters and AFE
PDF  34 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

ADPD144RI Datasheet(HTML) 11 Page - Analog Devices

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Data Sheet
ADPD144RI
Rev. A | Page 11 of 34
0
0.5
1.0
1.5
2.0
2.5
3.0
TIME (Seconds)
OPTICAL SAMPLING
LOCATIONS
NUMBER OF LED PULSES (
nA OR nB)
LED
CURRENT
(ILED)
SHOWN WITH fSAMPLE = 10 Hz
Figure 13. Example of a PPG Signal Sampled at a Data Rate of 10 Hz Using
Five Pulses per Sample
TIME SLOT SWITCH
Two different input configurations can be used with the four-
segment optical detector. The photodiodes can be assigned to
their own AFE channel to increase dynamic range or can be
summed to reduce noise. Photodiode outputs are assigned
depending on the settings of Register 0x14 (see Figure 14). Both
configurations are available and can be set independently for
Time Slot A and Time Slot B.
See Table 10 for the time slot switch register settings. For
situations requiring high dynamic range where all four channels
are needed, configure the channels such that each of the photo-
detector segments is routed to its own channel. For lower light
conditions, the two pairs of the segments can each be summed
into a single channel as shown in Figure 14. Using only half of
the amplifiers increases the signal to noise ratio by approximately a
factor of √2 but sacrifices saturation headroom.
CH1
PD1
VPDC
CH2
PD2
VPDC
CH3
PD3
VPDC
CH4
PD4
VPDC
INPUT CONFIGURATION FOR
REGISTER 0x14[11:8] = 0x4
REGISTER 0x14[7:4] = 0x4
NOTES
1. VPDC IS THE PD CATHODE VOLTAGE.
INPUT CONFIGURATION FOR
REGISTER 0x14[11:8] = 0x1
REGISTER 0x14[7:4] = 0x1
PD1
VPDC
PD2
VPDC
PD3
VPDC
CH3
CH4
PD4
VPDC
Figure 14. Input Configurations
Table 10. Time Slot Switch (Register 0x14)
Address
Bits
Name
Description
0x14
[11:8]
SLOTB_PD_SEL
Selects connection of PD1, PD2, PD3, or PD4 for Time Slot B, as shown in Figure 14.
0x1: Channel 3 and Channel 4 are connected during Time Slot B.
0x4: Channel 1, Channel 2, Channel 3, and Channel 4 are connected during Time Slot B.
Other: reserved.
[7:4]
SLOTA_PD_SEL
Selects connection of PD1, PD2, PD3, or PD4 for Time Slot A, as shown in Figure 14.
0x1: Channel 3 and Channel 4 are connected during Time Slot A.
0x4: Channel 1, Channel 2, Channel 3, and Channel 4 are connected during Time Slot A.
Other: reserved.



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