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DAC5687MPZPEP 数据表(PDF) 21 Page - Texas Instruments |
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DAC5687MPZPEP 数据表(HTML) 21 Page - Texas Instruments |
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21 / 75 page ![]() www.ti.com CLK1 CLK1C PLLLOCK IOGND IOVDD RESETB EXTIO EXTLO BIASJ IOUTA1 IOUTA2 IOUTB1 IOUTB2 TxENABLE DA[15:0] DB[15:0] CEXTIO 0.1 µF RBIAS 1 k Ω 3.3 V 3.3 V 100 Ω HP8665B Synthesized Signal Generator 1:4 Mini Circuits TCM4−1W 200 Ω 0.01 µF 16 Agilent 16702B Mainframe System With 16720A Pattern Generator Card Rohde & Schwarz FSQ8 Spectrum Analyzer PULSE FREQ. = fdata 93.1 Ω 0.033 µF 330 pF Agilent 8133A Pulse Generator CLK2 CLK2C 1.8 V/2.1 V 10 Ω 10 pF 3.3 V 16 PULSE FREQ. = fdata Ampl. = 1 VPP 1:4 Mini Circuits T4−1 3.3 V 3.3 V 100 Ω 3.3 V Sinusoid FREQ. = fdata B0039-02 3.3 V DAC5687-EP SGLS333 – JUNE 2006 Test Methodology (continued) Figure 28. DAC5687 Test Configuration for PLL Clock Mode WCDMA Test Model 1 test vectors for the DAC5687 characterization were generated in accordance with the 3GPP Technical Specification . Chip rate data was generated using the Test Model 1 block in Agilent ADS. For multicarrier signals, different random seeds and PN offsets were used for each carrier. A Matlab script performed pulse shaping, interpolation to the DAC input data rate, frequency offsets, rounding and scaling. Each test vector is 10 ms long, representing one frame. Special care is taken to assure that the end of file wraps smoothly to the beginning of the file. The cumulative complementary distribution function (CCDF) for the 1, 2, and 4 carrier test vectors is shown in Figure 29. The test vectors are scaled such that the absolute maximum data point is 0.95 (–0.45 dB) of full scale. No peak reduction is used. 21 Submit Documentation Feedback |
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