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ADS5485 Datasheet(PDF) 7 Page - Texas Instruments |
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ADS5485 Datasheet(HTML) 7 Page - Texas Instruments |
7 / 37 page N+1 N+2 N+6 t CLKH t CLKL N+3 N+4 N+5 t DRY t DATA Sample N T0158-02 Latency = 5 Clock Cycles Dx_y_P Dx_y_M CLKM CLKP DRY_M DRY_P Sampling Clock Input Data Clock Output Output Data O O O O O O O E E E E E E E N N – 1 E = Even Bits = B0, B2, B4, B6, B8, B10, B12, B14 O = Odd Bits = B1, B3, B5, B7, B9, B11, B13, B15 Dx_y_P/M are LVDS outputs that have two bits per pair (EVEN and ODD). The values for x and y are 0_1, 2_3, 4_5, ... 14_15. Aperture Delay t a ADS5484 ADS5485 www.ti.com ............................................................................................................................................... SLAS610C – AUGUST 2008 – REVISED OCTOBER 2009 TIMING INFORMATION Figure 1. Timing Diagram TIMING CHARACTERISTICS (1) Typical values at TA = 25°C: minimum and maximum values over full temperature range TMIN = –40°C to TMAX = 85°C, sampling rate = max rated, 50% clock duty cycle, AVDD5 = 5 V, AVDD3 = 3.3 V, DVDD3 = 3.3 V, and 3-VPP differential clock, unless otherwise noted. PARAMETER TEST CONDITIONS MIN TYP MAX UNIT ta Aperture delay 200 ps Aperture jitter, rms Internal jitter of the ADC 80 fs Latency 5 cycles tCLK Clock period 1e9/CLK 100 ns CLK = max rated clock for that part tCLKH Clock pulse duration, high 0.5e9/CLK 50 ns number tCLKL Clock pulse duration, low 0.5e9/CLK 50 ns tDRY CLK to DRY delay time(2) 1500 1900 2300 ps Zero crossing, 5-pF parasitic to GND tDATA CLK to DATA delay time(2) 1400 1900 2400 ps tSKEW DATA to DRY skew tDATA – tDRY, 5-pF parasitic to GND –500 0 500 ps tRISE DRY/DATA rise time 500 ps 5-pF parasitic to GND tFALL DRY/DATA fall time 500 ps (1) Timing parameters are assured by design or characterization, but not production tested. (2) DRY and DATA are updated on the rising edge of CLK input. The latency must be added to tDATA to determine the overall propagation delay. Copyright © 2008–2009, Texas Instruments Incorporated Submit Documentation Feedback 7 Product Folder Link(s): ADS5484 ADS5485 |
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