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AD9763AST Datasheet(PDF) 18 Page - Analog Devices |
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AD9763AST Datasheet(HTML) 18 Page - Analog Devices |
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18 / 28 page  REV. B AD9763 –18– (“Q DAC”) IOUTA QOUTA QOUTB DCOM FSADJ2 REFIO SLEEP RSET2 1.9k 0.1 F CLK2 Q DATA INPUT I DATA INPUT DVDD AVDD 500 100 500 500 IIPP IIPN IIQP IIQN AD6122 CLK1 FSADJ1 RSET1 2k RCAL 220 500 INPUT LATCHES 100 500 100 500 100 DAC LATCHES DAC DAC LATCHES DAC (“I DAC”) INPUT LATCHES WRT1 WRT2 ACOM AD9763 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 GAINCTRL IOUTB Figure 43. CDMA Transmit Application Using AD9763 and AD6122 Figure 43 shows an example of the AD9763 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. EVALUATION BOARD General Description The AD9763-EB is an evaluation board for the AD9763 10-bit dual D/A converter. Careful attention to layout and circuit design, combined with a prototyping area, allow the user to easily and effectively evaluate the AD9763 in any application where high resolution, high speed conversion is required. This board allows the user the flexibility to operate the AD9763 in various configurations. Possible output configurations include transformer coupled, resistor terminated, and single and differ- ential outputs. The digital inputs can be used in dual port or interleaved mode, and are designed to be driven from various word generators, with the on-board option to add a resistor network for proper load termination. When operating the AD9763, best performance is obtained when running the Digital Supply (DVDD) at +3 V and the Analog Supply (AVDD) at +5 V. |
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