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AFE4490 Datasheet(PDF) 11 Page - Texas Instruments |
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AFE4490 Datasheet(HTML) 11 Page - Texas Instruments |
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11 / 96 page  AFE4490 www.ti.com SBAS602G – DECEMBER 2012 – REVISED JUNE 2014 Electrical Characteristics (continued) Minimum and maximum specifications are at TA = –40°C to 85°C. Typical specifications are at 25°C. All specifications are at RX_ANA_SUP = RX_DIG_SUP = 3 V, TX_CTRL_SUP = LED_DRV_SUP = 5 V, stage 2 amplifier disabled, and fCLK = 8 MHz, unless otherwise noted. PARAMETER TEST CONDITIONS MIN TYP MAX UNIT I-V TRANSIMPEDANCE AMPLIFIER See the Receiver Channel section G Gain RF = 10 kΩ to RF = 1 MΩ V/µA for details Gain accuracy ±7% 10k, 25k, 50k, 100k, 250k, Feedback resistance RF Ω 500k, and 1M Feedback resistor tolerance RF ±7% Feedback capacitance CF 5, 10, 25, 50, 100, and 250 pF Feedback capacitor tolerance CF ±20% VOD(fs) Full-scale differential output voltage 1 V Common-mode voltage on input pins Set internally 0.9 V Includes equivalent capacitance of photodiode, External differential input capacitance 10 1000 pF cables, EMI filter, and so forth With a 1-k Ω series resistor and a 10-nF VO(shield) Shield output voltage, VCM decoupling capacitor to ground, when loaded with 0.8 0.9 1.0 V a small current (for example, of a few µA or less) AMBIENT CANCELLATION STAGE G Gain 0, 3.5, 6, 9.5, and 12 dB Current DAC range 0 10 µA Current DAC step size 1 µA LOW-PASS FILTER Low-pass corner frequency 3-dB attenuation 0.5 and 1 kHz Duty cycle = 25% 0.004 dB Pass-band attenuation, 2 Hz to 10 Hz Duty cycle = 10% 0.041 dB After diagnostics mode with filter corner = 500 Hz 28 ms Filter settling time After diagnostics mode with filter corner = 16 ms 1000 Hz ADC bypass outputs output impedance RXOUTP and RXOUTN 1 k Ω ANALOG-TO-DIGITAL CONVERTER Resolution 22 Bits See the ADC Operation and Averaging Module Sample rate 4 × PRF SPS section ADC full-scale voltage ±1.2 V See the ADC Operation and Averaging Module ADC conversion time 50 PRF / 4 µs section ADC reset time 2 tCLK TRANSMITTER 0, 50, 75, 100, 150, and 200 Output current range (see the LEDCNTRL: LED Control mA Register for details) LED current DAC error ±5% Output current resolution 8 Bits 0.1-Hz to 20-Hz bandwidth, at 25-mA output 110 dB current Transmitter noise dynamic range 0.1-Hz to 20-Hz bandwidth, at 100-mA output 110 dB current Minimum sample time of LED1 and LED2 50 µs pulses LED_ON = 0 1 µA LED current DAC leakage current LED_ON = 1 50 µA LED current DAC linearity Percent of full-scale current 0.5% From zero current to 150 mA 7 µs Output current settling time (with resistive load) From 150 mA to zero current 7 µs Copyright © 2012–2014, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Links: AFE4490 |
Similar Part No. - AFE4490_14 |
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