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AFE4404YZPR Datasheet(PDF) 10 Page - Texas Instruments |
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AFE4404YZPR Datasheet(HTML) 10 Page - Texas Instruments |
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10 / 83 page  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 AFE4404 SBAS689B – JUNE 2015 – REVISED OCTOBER 2015 www.ti.com 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 Figure 14. Transmitter Current Linearity 5% Duty Cycle Figure 15. LED Current vs Transmitter Headroom Voltage Figure 16. Transmitter DAC Current Step Error in 50-mA Mode Duty cycle = 1% Figure 17. Transmitter DAC Current Step Error in Figure 18. PSRR vs Tone Frequency at TX_SUP 100-mA Mode 10 Submit Documentation Feedback Copyright © 2015, Texas Instruments Incorporated Product Folder Links: AFE4404 |
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