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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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DAC5687MPZPEP датащи(PDF) 19 Page - Texas Instruments |
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DAC5687MPZPEP датащи(HTML) 19 Page - Texas Instruments |
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19 / 75 page  www.ti.com f − Frequency − MHz −130 −120 −110 −100 −90 −80 −70 −60 −50 −40 −30 −20 133 138 143 148 153 158 163 168 173 G025 fdata = 122.88 MSPS IF = 153.6 MHz y4 Interpolation CMIX Carrier Power 1 (Ref): −19.88 dBm ACLR (5 MHz): 66.6 dB ACLR (10 MHz): 65.73 dB Test Methodology DAC5687-EP SGLS333 – JUNE 2006 Typical Characteristics (continued) Figure 26. WCDMA TM1 : Four Carrier, PLL Off, DVDD = 2.1 V Typical ac specifications in external clock mode were characterized with the DAC5687EVM using the test configuration shown in Figure 27. The DAC sample rate clock fDAC is generated by a HP8665B signal generator. An Agilent 8133A pulse generator is used to divide fDAC for the data rate clock fDATA for the Agilent 16702A pattern generator clock and provide adjustable skew to the DAC input clock. The 8133A fDAC output is set to 1 VPP, equivalent to 2-VPP differential at CLK2/CLK2C pins. Alternatively, the DAC5687 PLLLOCK output can be used for the pattern generator clock. The DAC5687 output is characterized with a Rohde & Schwarz FSQ8 spectrum analyzer. For WCDMA signal characterization, it is important to use a spectrum analyzer with high IP3 and noise subtraction capability so that the spectrum analyzer does not limit the ACPR measurement. For all specifications, both DACA and DACB are measured and the lowest value used as the specification. 19 Submit Documentation Feedback |
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