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ADS4145IRGZT Datasheet(PDF) 8 Page - Texas Instruments |
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ADS4145IRGZT Datasheet(HTML) 8 Page - Texas Instruments |
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8 / 74 page  8 ADS4122, ADS4125, ADS4142, ADS4145 SBAS520B – FEBRUARY 2011 – REVISED JANUARY 2016 www.ti.com Product Folder Links: ADS4122 ADS4125 ADS4142 ADS4145 Submit Documentation Feedback Copyright © 2011–2016, Texas Instruments Incorporated Recommended Operating Conditions (continued) Over operating free-air temperature range, unless otherwise noted. MIN NOM MAX UNIT (3) It is recommended to use these modes to obtain best performance. These modes can be set using the serial interface only. (4) See the Serial Interface section for details on register programming. (5) Note that these modes cannot be set when the serial interface is not used (when the RESET pin is tied high); see the Device Configuration section. Input clock duty cycle Low-speed enabled 40% 50% 60% Low-speed disabled 35% 50% 65% DIGITAL OUTPUTS CLOAD Maximum external load capacitance from each output pin to DRGND 5 pF RLOAD Differential load resistance between the LVDS output pairs (LVDS mode) 100 Ω TA Operating free-air temperature –40 85 °C HIGH PERFORMANCE MODES(3)(4)(5) Mode 1 Set the MODE 1 register bits to get best performance across sample clock and input signal frequencies. Register address = 03h, register data = 03h Mode 2 Set the MODE 2 register bit to get best performance at high input signal frequencies greater than 230 MHz. Register address = 4Ah, register data = 01h (1) For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application report, SPRA953. 7.4 Thermal Information THERMAL METRIC(1) ADS412x ADS414x UNIT RGZ (VQFN) 48 PIN RθJA Junction-to-ambient thermal resistance 29 °C/W RθJCtop Junction-to-case (top) thermal resistance N/A °C/W RθJB Junction-to-board thermal resistance 10 °C/W ψJT Junction-to-top characterization parameter 0.3 °C/W ψJB Junction-to-board characterization parameter 9 °C/W RθJCbot Junction-to-case (bottom) thermal resistance 1.1 °C/W 7.5 Electrical Characteristics: ADS412x Typical values are at 25°C, AVDD = 1.8 V, DRVDD = 1.8 V, 50% clock duty cycle, –1dBFS differential analog input, 0dB gain, and DDR LVDS interface, unless otherwise noted. Minimum and maximum values are across the full temperature range: TMIN = –40°C to TMAX = 85°C, AVDD = 1.8 V, and DRVDD = 1.8 V. PARAMETER TEST CONDITIONS MIN TYP MAX UNIT Resolution 12 Bits SNR (signal-to-noise ratio), LVDS fIN = 10 MHz ADS4122 (65MSPS) 71.1 dBFS ADS4125 (125MSPS) 71 fIN = 70 MHz ADS4122 (65MSPS) 70.9 dBFS ADS4125 (125MSPS) 70.8 fIN = 100 MHz ADS4122 (65MSPS) 70.7 dBFS ADS4125 (125MSPS) 70.6 fIN = 170 MHz ADS4122 (65MSPS) 67 70.2 dBFS ADS4125 (125MSPS) 68 70.1 fIN = 300 MHz ADS4122 (65MSPS) 68.8 dBFS ADS4125 (125MSPS) 69.6 |
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