AD9772

The AD9772 is a single supply, oversampling, 14-bit digital-to-analog converter (DAC) optimized for baseband or IF waveform reconstruction applications requiring exceptional dynamic range.Manufactured on an advanced CMOS process, it integrates a complete, low distortion 14-bit DAC with a 2`  digital interpola-tion filter and clock multiplier. The on-chip PLL clock multi-
plier provides all the necessary clocks for the digital filter and the 14-bit DAC. A flexible differential clock input allows for a single-ended or differential clock driver for optimum jitter performance.For baseband applications, the 2`  digital interpolation filter provides a low pass response, hence providing up to a three-fold reduction in the complexity of the analog reconstruction filter. It does so by multiplying the input data rate by a factor of two while simultaneously suppressing the original upper inband image by more than 73 dB.

For direct IF applications, the 2`digital interpolation filter response can be reconfigured to select the upper inband image (i.e., high pass response) while sup-pressing the originalbaseband image. To increase the signal level of the higher IF images and their passband flatness in di-rect IF applications, the AD9772 also features a "zero stuffing"option in which the data following the 2`  interpolation filter is upsampled by a factor of two by inserting midscale data samples.

The AD9772 can reconstruct full-scale waveforms with band-widths as high as 63.3 MHz while operating at an input data rate of 150 MSPS. The 14-bit DAC provides differential current out-
puts to support differential or single-ended applications. A TxDAC+ is a trademark of Analog Devices, Inc.