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14-bit converter performs direct digital synthesis for RF signals to 3.6 GHz

Norwood, Mass.—Analog Devices Inc. has introduced a pair of 14-bit DACs (digital-to-analog converters) that perform direct digital synthesis for signals up to 3.6 GHz.

The AD9789 and AD9739 DACs are part of ADI's TxDAC family of transmit digital-to-analog converters, and feature its proprietary Mix-Mode super-Nyquist architecture, which supports high-fidelity digital synthesis of RF signals up to 3.6 GHz.

Their design allows broadband and next-generation-wireless equipment designers to use one transmit DAC architecture for multiple communications standards. In addition, the devices eliminate an off-chip mixer and low-pass filter to reduce design complexity, cost, size, and power in broadband-communication systems.

The AD9789 14-bit TxDAC integrates a QAM encoder, interpolator, and digital up-converter that achieve a 2.4-GHz sample rate for cable infrastructure. The 2.5-GHz AD9739 exploits the same DAC core, and features what the company says is the industry's widest useable input bandwidth.

Pricing: In 1K quantities, AD9739 in a 160-Ball CSBGA is $43.69; AD9789 in a 164-Ball CSBGA is $53.10.
Availability: Now in volume production.
Datasheets: AD9789 and AD9739.

Analog Devices, www.analog.com

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