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AD9767AST 数据表(PDF) 17 Page - Analog Devices |
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AD9767AST 数据表(HTML) 17 Page - Analog Devices |
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17 / 27 page ![]() REV. B AD9767 –17– (“Q DAC”) IOUTA QOUTA QOUTB DCOM FSADJ2 REFIO SLEEP RSET2 1.9k 0.1 F CLK2 Q DATA INPUT I DATA INPUT DVDD AVDD 500 50 500 500 IIPP IIPN IIQP IIQN AD6122 CLK1 FSADJ1 RSET1 2k RCAL 220 500 INPUT LATCHES 50 500 50 500 50 DAC LATCHES DAC DAC LATCHES DAC INPUT LATCHES WRT1 WRT2 ACOM AD9767 U1 U2 LOIPP LOIPN 2 PHASE SPLITTER REFIN VGAIN GAIN CONTROL TXOPP TXOPN GAIN CONTROL SCALE FACTOR TEMPERATURE COMPENSATION MODOPN MODOPP VCC VCC 3V 500 500 IOUTB (“I DAC”) Figure 42. CDMA Transmit Application Using AD9767 and AD6122 Figure 41 shows the AD9767, when used with the AD8346, reconstructing a wideband CDMA signal at 2.4 GHz. The baseband signal is being sampled at 65 MSPS and has a chip rate of 8M chips. == –80 –120 –70 –90 –110 –50 –60 –100 –40 CENTER 2.4GHz 3MHz SPAN 30MHz –130 –30 c11 cu1 cu1 C0 C0 c11 FREQUENCY Figure 41. CDMA Signal, 8 M Chips Sampled at 65 MSPS, Recreated at 2.4 GHz Adjacent Channel Power > 60 dBm Figure 42 shows an example of the AD9767 used in a W-CDMA transmitter application using the AD6122 CDMA 3 V IF sub- system. The AD6122 has functions, such as external gain con- trol and low distortion characteristics, needed for the superior Adjacent Channel Power (ACP) requirements of W-CDMA. |
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