Spot sales of AD9772AAST 14-Bit, 160 MSPS TxDAC+ with 2x Interpolation Filter LQFP48

Product Descriptions

The AD9772A is a single-supply, oversampling, 14-bit digitalto-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 interpolation filter and clock multiplier. The on-chip PLL clock multiplier 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, thus providing as much as a threefold reduction in the complexity of the analog reconstruction filter. It does so by multiplying the input data rate by a factor of 2 while suppressing the original upper in-band image by more than 73 dB. For direct IF applications, the 2× digital interpolation filter response can be reconfigured to select the upper in-band image (that is, the high-pass response) while suppressing the original baseband image. To increase the signal level of the higher IF images and their pass-band flatness in direct IF applications, the AD9772A also features a zero-stuffing option in which the data following the 2× interpolation filter is upsampled by a factor of 2 by inserting midscale data samples.

The AD9772A can reconstruct full-scale waveforms with bandwidths of up to 67.5 MHz while operating at an input data rate of 160 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 can be fed into a transformer or a differential op amp topology to obtain a single-ended output voltage using an appropriate resistive load.

The on-chip band gap reference and control amplifier are configured for maximum accuracy and flexibility. The AD9772A can be driven by the on-chip reference or by a variety of external reference voltages. The full-scale current of the AD9772A can be adjusted over a 2 mA to 20 mA range, thus providing additional gain-ranging capabilities.

The AD9772A is available in a 48-lead LQFP package and is specified for operation over the industrial temperature range of –40°C to +85°C.

Product Features

Single 3.1 V to 3.5 V supply

14-bit DAC resolution and input data width

160 MSPS input data rate

67.5 MHz reconstruction pass band @ 160 MSPS

74 dBc SFDR @ 25 MHz

2× interpolation filter with high- or low-pass response

73 dB image rejection with 0.005 dB pass-band ripple

Zero-stuffing option for enhanced direct IF performance

Internal 2×/4× clock multiplier

250 mW power dissipation; 13 mW with power-down mode

48-lead LQFP package

Product Applications

Communication transmit channel

W-CDMA base stations, multicarrier base stations,

direct IF synthesis, wideband cable systems Instrumentation

Product Photos

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