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DAC5670-SP Datenblatt(PDF) 11 Page - Texas Instruments |
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DAC5670-SP Datenblatt(HTML) 11 Page - Texas Instruments |
11 / 34 page DACLK_P/N DACCLK/2 internal toDAC5670 DLYCLK_P/N DTCLK_P/N DA_P/N[13:0] DB_P/N[13:0] internal data to the DAC core in NORMAL mode a0 a1 a2 a3 b3 b2 b1 b0 a0 b0 a1 b1 This internal DACCLK/2 is used to clock the input data DA and DB into theDAC5670 DLYCLK is DACCLK/4 delayed by the DAC5670 DLL to be used as the DDR clock for the data source digital chip DTCLK is a toggling bit, aligned with DA and DB data from chip, used by the DAC5670 DLL feedback path 7 DACCLKs Pipeline Delay DAC5670-SP www.ti.com SGLS386F – JANUARY 2009 – REVISED OCTOBER 2014 7.7 Digital Electrical Characteristics TC,MIN = –55°C to TC,MAX = 125°C, typical values at 25°C, AVDD = 3 to 3.6 V, IoutFS = 20 mA (unless otherwise noted) PARAMETER TEST CONDITIONS MIN TYP(1) MAX UNIT CMOS INTERFACE (SLEEP, RESTART, INV_CLK, NORMAL, A_ONLY, A_ONLY_INV, A_ONLY_ZS) IIH High-level input current 0.2 10 μA IIL Low-level input current –10 –0.2 μA Input capacitance 2.5(2) pF DIFFERENTIAL DATA INTERFACE (DA_P[13:0], DA_N[13:0], DB_P[13:0], DB_N[13:0], DTCLK_P, DTCLK_N) ZT Internal termination impedance 80 100 125 Ω Ci Input capacitance 2.6(2) pF (1) Typicals are characterization values at 25°C and AVDD = 3.3 V. These parameters are characterized, but not production tested. (2) Specified by design. 7.8 Timing Requirements MIN TYP MAX UNIT DIFFERENTIAL DATA INTERFACE (DA_P[13:0], DA_N[13:0], DB_P[13:0], DB_N[13:0] EXTERNAL TIMING WITH DLL IN RESTART) (See Figure 2) RESTART = 1, DLYCLK 20-pF load tsetup Data setup to DLYCLK(1) 4.75 nS See Figure 2 RESTART = 1, DLYCLK 20-pF load thold Data hold to DLYCLK (1) –3.5 nS See Figure 2 DLL (See Figure 15) NegD DLL min negative delay RESTART = 0 150 ps PosD DLL min positive delay RESTART = 0 600 ps CLK/4 internal setup + hold tvalid 160 ps width Fdac RESTART = 0 1 2.4 GHz (1) Tested using SNR as pass/fail criteria. Figure 1. DLL Input Loop Functional Timing Copyright © 2009–2014, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Links: DAC5670-SP |
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Ähnliche Beschreibung - DAC5670-SP_15 |
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