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Description:14-bit, 32MSPS TxDAC with 4X interpolation filter. For communications transmitt channel: wireless basestations, ADSL/HFC modems, direct digital synthesis (DDS)
Manufacturer:Analog Devices
Oper. temp.:-40 to 85
Datasheet:PDF (325K).
Click here to download *)

The AD9774 is a single supply, oversampling, 14-bit digital-toanalog converter (DAC) optimized for waveform reconstruction applications requiring exceptional dynamic range. Manufactured on an advanced CMOS process, it integrates a complete, low distortion 14-bit DAC with a 4x digital interpolation filter and clock multiplier. The two-stage, 4x digital interpolation filter provides more than a six-fold reduction in the complexity of the analog reconstruction-filter. It does so by multiplying the input data rate by a factor of four while simultaneously suppressing the original inband images by more than 69 dB. The on-chip clock multiplier provides all the necessary clocks. The AD9774 can reconstruct full-scale waveforms having bandwidths as high as 13.5 MHz when operating at an input data rate of 32 MSPS and a DAC output rate of 128 MSPS. The 14-bit DAC provides differential current outputs to support differential or single-ended applications. A segmented current source architecture is combined with a proprietary switching technique to reduce spurious components and enhance dynamic performance. Matching between the two current outputs ensures enhanced dynamic performance in a differential output configuration. The differential current outputs may be fed into a transformer or tied directly to an output resistor to provide two complementary, single-ended voltage outputs. A differential op amp topology can also be used to obtain a single-ended output voltage. The output voltage compliance range is nominally 1.25 V. TxDAC+ is a trademark of Analog Devices, Inc.

Click here to download AD9774EB Datasheet
Click here to download AD9774EB Datasheet
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