Datasheet

0
100
200
300
400
500
600
0 10 20 30 40 50
Input Referred Noise Current,
pA rms in 5Hz Bandwidth
Pleth Current (A)
Duty Cycle = 1%
Duty Cycle = 5%
Duty Cycle = 10%
Duty Cycle = 15%
Duty Cycle = 20%
Duty Cycle = 25%
C005
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).
Noise is calculated in 5Hz B/W.
0
100
200
300
400
500
600
700
0 10 20 30 40 50
Input Referred Noise Current,
pA rms in 5Hz Bandwidth
Pleth Current (A)
Duty Cycle = 1%
Duty Cycle = 5%
Duty Cycle = 10%
Duty Cycle = 15%
Duty Cycle = 20%
Duty Cycle = 25%
C006
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).
Noise is calculated in 5Hz B/W.
45
46
46
47
47
48
48
49
49
50
50
2.5 3.0 3.5 4.0 4.5 5.0
TX_CTRL_SUP Current (A)
TX_CTRL_SUP Voltage (V)
C003
PRF = 600Hz
45.0
45.5
46.0
46.5
47.0
47.5
48.0
48.5
49.0
49.5
50.0
2.5 3.0 3.5 4.0 4.5 5.0
LED_DRV_SUP Current (A)
LED_DRV_SUP Voltage (V)
C004
With LED Current = 0mA
100
200
300
400
500
600
700
800
100 300 500 700 900 1100 1300
RX Current (A)
PRF (Hz)
RX_ANA_SUP_CURR (A)
RX_DIG_SUP_CURR (A)
RX_ANA_CURR_STG2EN (A)
C001
RX_ANA_SUP = RX_DIG_SUP = 3.6V
100
200
300
400
500
600
700
800
100 300 500 700 900 1100 1300
RX Current (A)
PRF (Hz)
RX_ANA_SUP_CURR (A)
RX_DIG_SUP_CURR (A)
RX_ANA_CURR_STG2EN (A)
C002
RX_ANA_SUP = RX_DIG_SUP = 2.0V
AFE4490
www.ti.com SBAS602F –DECEMBER 2012–REVISED OCTOBER 2013
TYPICAL CHARACTERISTICS
At T
A
= +25°C, RX_ANA_SUP = RX_DIG_SUP = 3.0 V, TX_CTRL_SUP = LED_DRV_SUP = 5 V, and f
CLK
= 8 MHz, unless
otherwise noted.
Figure 3. TOTAL Rx CURRENT vs PRF Figure 4. TOTAL Rx CURRENT vs PRF
Figure 5. TX_CTRL_SUP CURRENT vs Figure 6. LED_DRV_SUP CURRENT vs
TX_CTRL_SUP VOLTAGE LED_DRV_SUP VOLTAGE
Figure 7. INPUT-REFERRED NOISE CURRENT vs Figure 8. INPUT-REFERRED NOISE CURRENT vs
PLETH CURRENT (BW = 5 Hz, PRF = 100 Hz) PLETH CURRENT (BW = 5 Hz, PRF = 300 Hz)
Copyright © 2012–2013, Texas Instruments Incorporated Submit Documentation Feedback 13
Product Folder Links: AFE4490