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AFE4490RHAR データシート(PDF) 13 Page - Texas Instruments

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部品番号 AFE4490RHAR
部品情報  Integrated Analog Front-End for Pulse Oximeters
PDF  70 Pages
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メーカー  TI [Texas Instruments]
ホームページ  http://www.ti.com
Logo TI - Texas Instruments

AFE4490RHAR データシート(HTML) 13 Page - Texas Instruments

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±500
±400
±300
±200
±100
0
100
200
300
400
500
0
50
100
150
200
250
TX LED DAC Setting
C017
TX_REF = 0.5V
0
20
40
60
80
100
0
50
100
150
200
250
TX LED DAC Setting
Expected + 1%
Expected ± 1%
Actual DAC Current
C018
TX Reference Voltage = 0.5V
±500
±400
±300
±200
±100
0
100
200
300
400
500
0
50
100
150
200
250
TX LED DAC Setting
C015
TX_REF = 0.5V
±500
±400
±300
±200
±100
0
100
200
300
400
500
0
50
100
150
200
250
TX LED DAC Setting
C016
TX_REF = 0.5V
10
11
12
13
14
15
0
10
20
30
40
50
Pleth Current ( A)
Duty Cycle = 1%
Duty Cycle = 5%
Duty Cycle = 10%
Duty Cycle = 15%
Duty Cycle = 20%
Duty Cycle = 25%
C013
For each setting RF adjusted for Full-
Scale Output.
Amb Cancellation & stage 2 Gain = 4
used for Low Pleth currents (0.125uA,
0.25uA & 0.5uA).
RMS noise is calculated in 5Hz B/W &
NFB is calculated using 6.6 u RMS noise.
50
60
70
80
90
100
110
120
0
20
40
60
80
100
% of Full-Scale LED Current
100mA Range
150mA Range
200mA Range
C014
AFE4490
www.ti.com
SBAS602B – DECEMBER 2012 – REVISED FEBRUARY 2013
TYPICAL CHARACTERISTICS (continued)
At TA = +25°C, RX_ANA_SUP = RX_DIG_SUP = 3.0 V, TX_CTRL_SUP = LED_DRV_SUP = 5 V, and fCLK = 8 MHz, unless
otherwise noted.
Figure 14. NOISE-FREE BITS vs
Figure 15. Tx DYNAMIC RANGE
PLETH CURRENT (PRF = 2500 Hz)
Figure 16. DAC CURRENT STEP vs
Figure 17. DAC CURRENT STEP vs
Tx LED SETTING (Tx Range = 200 mA)
Tx LED SETTING (Tx Range = 150 mA)
Figure 18. DAC CURRENT STEP vs
Figure 19. Tx CURRENT LINEARITY (100-mA Range)
Tx LED SETTING (Tx Range = 100 mA)
Copyright © 2012–2013, Texas Instruments Incorporated
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Product Folder Links: AFE4490



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