AFE4400 Datasheet, PDF (15/69 Pages) Texas Instruments – Integrated Analog Front-End for Heart Rate Monitors and Low-Cost Pulse Oximeters

AFE4400
www.ti.com
SBAS601D – DECEMBER 2012 – REVISED MAY 2013
TYPICAL CHARACTERISTICS (continued)
At T_A = +25°C, RX_ANA_SUP = RX_DIG_SUP = 3.0 V, TX_CTRL_SUP = LED_DRV_SUP = 3.3 V, and f_CLK = 8 MHz, unless
otherwise noted.
500
TX_RANGE = 50mA,
Data from 2326 devices
400
400
TX_RANGE = 50mA,
Data from 2326 devices
300
300
200
200
100
100
0
LED Current (mA)
C023
Figure 21. LED CURRENT WITH Tx DAC SETTING = 10
(2 mA)
400
TX_RANGE = 50mA,
Data from 2326 devices
300
0
LED Current (mA)
C024
Figure 22. LED CURRENT WITH Tx DAC SETTING = 25
(5 mA)
400
TX_RANGE = 50mA,
Data from 7737 devices
300
200
200
100
100
0
LED Current (mA)
C025
Figure 23. LED CURRENT WITH Tx DAC SETTING = 51
(10 mA)
400
TX_RANGE = 50mA,
Data from 7737 devices
300
200
100
0
LED Current (mA)
C027
Figure 25. LED CURRENT WITH Tx DAC SETTING = 255
(50 mA)
0
LED Current (mA)
C026
Figure 24. LED CURRENT WITH Tx DAC SETTING = 102
(20 mA)
800
700
600
500
RX_ANA_SUP = 2V (STG2=DIS)
RX_ANA_SUP = 2V (STG2=EN)
400
RX_DIG_SUP=2V
RX_ANA_SUP = 3.3V (STG2=DIS)
RX_ANA_SUP = 3.3V (STG2=EN)
300
RX_DIG_SUP=3.3V
200
100
100
300
500
700
900
1100
PRF, Hz
C028
Figure 26. RECEIVER SUPPLIES vs PRF
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