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AFE4490 데이터시트(PDF) 11 Page - Texas Instruments

부품명 AFE4490
상세설명  AFE4404 Ultra-Small, Integrated AFE for Wearable, Optical, Heart-Rate Monitoring and Bio-Sensing
PDF  85 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
제조업체  TI2 [Texas Instruments]
홈페이지  https://www.ti.com
Logo TI2 - Texas Instruments

AFE4490 데이터시트(HTML) 11 Page - Texas Instruments

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Transmitter DAC Current Setting Code
0
10
20
30
40
50
60
-100
-75
-50
-25
0
25
50
75
100
Frequency (Hz) of Tone at TX_SUP Pin
10
100
1000
10000
100000
1000000
40
50
60
70
80
90
100
Transmitter Head_Room Voltage (V)
0.3
0.9
1.5
2.1
2.7
3.3
20
40
60
80
100
120
50-mA LED Current Mode
100-mA LED Current Mode
Transmitter DAC Current Setting Code
0
10
20
30
40
50
60
-60
-40
-20
0
20
40
60
Frequency (Hz)
0
100
200
300
400
500
600
700
800
900 1000
-30
-25
-20
-15
-10
-5
0
5
PRF = 50 Hz
PRF = 100 Hz
PRF = 200 Hz
PRF = 400 Hz
PRF = 800 Hz
PRF = 1000 Hz
Transmitter DAC Current Setting Code
0
10
20
30
40
50
60
0
20
40
60
80
100
120
50-mA LED Current Mode
100-mA LED Current Mode
11
AFE4404
www.ti.com
SBAS689D – JUNE 2015 – REVISED DECEMBER 2016
Product Folder Links: AFE4404
Submit Documentation Feedback
Copyright © 2015–2016, Texas Instruments Incorporated
Typical Characteristics (continued)
At 25°C, TX_SUP = 4 V, RX_SUP = IO_SUP = 3.3 V, 100-Hz PRF, 25% duty cycle, Rf = 500 kΩ, Cf is adjusted to keep the
TIA time constant at 1/10th of the sampling duration, 8-MHz external clock (with CLKDIV_EXTMODE set to divide-by-2),
CLKDIV_PRF = 1, detector CIN = 50 pF, ADC averaging = max allowed, SNR (dBFS) = noise referred to full-scale range of
2 V, noise integrated from 1 Hz to Nyquist (= PRF / 2), and values assigned to CLKDIV_EXTMODE and CLK_DIV_PRF
parameters correspond to division ratios controlled by these modes, unless otherwise specified.
Figure 13. Filter Response for Multiple PRFs at
5% Duty Cycle
Figure 14. Transmitter Current Linearity
Figure 15. LED Current vs Transmitter Headroom Voltage
Figure 16. Transmitter DAC Current Step Error in
50-mA Mode
Figure 17. Transmitter DAC Current Step Error in
100-mA Mode
Duty cycle = 1%
Figure 18. PSRR vs Tone Frequency at TX_SUP



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