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ADS4242 Datasheet(PDF) 4 Page - Texas Instruments |
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ADS4242 Datasheet(HTML) 4 Page - Texas Instruments |
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4 / 67 page  ADS4229 SBAS550B – JUNE 2011 – REVISED AUGUST 2012 www.ti.com RECOMMENDED OPERATING CONDITIONS Over operating free-air temperature range, unless otherwise noted. ADS4229 PARAMETER MIN NOM MAX UNIT SUPPLIES Analog supply voltage, AVDD 1.7 1.8 1.9 V Digital supply voltage, DRVDD 1.7 1.8 1.9 V ANALOG INPUTS Differential input voltage range 2 VPP Input common-mode voltage VCM ± 0.05 V Maximum analog input frequency with 2-VPP input amplitude (1) 400 MHz Maximum analog input frequency with 1-VPP input amplitude (1) 600 MHz CLOCK INPUT Input clock sample rate Low-speed mode enabled(2) 1 80 MSPS Low-speed mode disabled(2) (by default after reset) 80 250 MSPS Sine wave, ac-coupled 0.2 1.5 VPP LVPECL, ac-coupled 1.6 VPP Input clock amplitude differential (VCLKP – VCLKM) LVDS, ac-coupled 0.7 VPP LVCMOS, single-ended, ac-coupled 1.5 V Input clock duty cycle Low-speed mode disabled 35 50 65 % Low-speed mode enabled 40 50 60 % DIGITAL OUTPUTS Maximum external load capacitance from each output pin to DRGND, CLOAD 5 pF Differential load resistance between the LVDS output pairs (LVDS mode), RLOAD 100 Ω Operating free-air temperature, TA –40 +85 °C (1) See the Theory of Operation section in the Application Information. (2) See the Serial Interface Configuration section for details on programming the low-speed mode. HIGH-PERFORMANCE MODES(1)(2) PARAMETER DESCRIPTION Set the HIGH PERF MODE[2:1] register bit to obtain best performance across sample clock and input signal High-performance mode frequencies. Register address = 03h, data = 03h Set the HIGH FREQ MODE CH A and HIGH FREQ MODE CH B register bits for high input signal frequencies greater than 200 MHz. High-frequency mode Register address = 4Ah, data = 01h Register address = 58h, data = 01h Set the HIGH PERF MODE[2:7] bits to obtain best performance across input signal frequencies for sampling rates greater than 160 MSPS. Note that this mode changes VCM to 0.87 V from its default value of 0.95 V. High-speed mode Register address = 2h, data = 40h Register address = D5h, data = 18h Register address = D7h, data = 0Ch Register address = DBh, data = 20h (1) It is recommended to use these modes to obtain best performance. (2) See the Serial Interface Configuration section for details on register programming. 4 Submit Documentation Feedback Copyright © 2011–2012, Texas Instruments Incorporated Product Folder Links: ADS4229 |
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