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AFE4403 Datasheet(PDF) 17 Page - Texas Instruments |
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AFE4403 Datasheet(HTML) 17 Page - Texas Instruments |
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17 / 97 page  96 97 98 99 100 101 102 103 104 105 106 0 5 10 15 20 25 Duty Cycle (%) Stg2Gain = 1 Stg2Gain = 1.5 Stg2Gain = 2 Stg2Gain = 3 Stg2Gain = 4 C023 0 4 8 12 16 20 0 5 10 15 20 25 Duty Cycle (%) Stg2Gain = 1 Stg2Gain = 1.5 Stg2Gain = 2 Stg2Gain = 3 Stg2Gain = 4 C022 96 98 100 102 104 106 ±20 ±10 0 10 20 30 40 50 60 70 Temperature (deg C) RF = 250 k RF = 500 k C021 10 14 18 22 26 30 ±20 ±10 0 10 20 30 40 50 60 70 Temperature (deg C) RF = 250 k RF = 500 k C020 96 98 100 102 104 106 0 2 4 6 8 10 Dynamic Powerdown Cycle Width (ms) C019 10 14 18 22 26 30 0 2 4 6 8 10 Dynamic Powerdown Cycle width (ms) C018 AFE4403 www.ti.com SBAS650B – MAY 2014 – REVISED JULY 2014 Typical Characteristics (continued) At PRF = 100 Hz, 25% duty cycle, RF = 500 kΩ, CF is adjusted to keep TIA time constant at 1/10th of sampling duration, All supplies at 3.3 V, 8-MHz external clock, CLKOUT tri-state, 1-µF capacitor on TX_REF and BG pins, detector CIN = 50 pF, TX_REF = 0.5 V, ADC averaging = max allowed, and SNR in dBFS is noise referred to full-scale range of 2 V, unless otherwise noted. PRF = 100 Hz LED pulse = 100 µs PRF = 100 Hz LED pulse = 100 µs All four DYNAMIC bits set to 1 All four DYNAMIC bits set to 1 Figure 23. Receiver SNR over Nyquist Bandwidth vs Figure 24. Receiver Input-Referred Noise over Nyquist Dynamic Power-Down Duty Cycle Bandwidth vs Dynamic Power-Down Duty Cycle LED pulse = 100 µs Pleth current = 1 µA LED pulse = 100 µs Pleth current = 1 µA Figure 25. SNR in 20-Hz Bandwidth vs Temperature Figure 26. Input-Referred Noise Current in 20-Hz BW vs Temperature (TX-Rx Loopback) (Tx-Rx Loopback) Stage 2 enabled Stage 2 enabled Figure 27. Receiver SNR over Nyquist Bandwidth vs Figure 28. Receiver Input-Referred Noise Current over Nyquist Bandwidth vs Duty Cycle Duty Cycle (Different Stage 2 Gain Settings) (Different Stage 2 Gain Settings) Copyright © 2014, Texas Instruments Incorporated Submit Documentation Feedback 17 Product Folder Links: AFE4403 |
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