Analog Devices Squeezes Entire Cable Spectrum into One Port

Analog Devices introduced a 14-bit D/A converter designed to enable cable operators to synthesize the entire cable spectrum up to 1 GHz into a single RF port, while consuming a maximum of 1.1 W of power. The AD9739A TxDAC 14-bit 2.5 GSPS D/A converter's bandwidt...

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Analogdevices 300x300Analog Devices introduced a 14-bit D/A converter designed to enable cable operators to synthesize the entire cable spectrum up to 1 GHz into a single RF port, while consuming a maximum of 1.1 W of power. The AD9739A TxDAC 14-bit 2.5 GSPS D/A converter's bandwidth and dynamic range are intended to enable cable operators to increase QAM channel densities by 20 times over today's cable modems.

The AD9739A features ADI's proprietary mix-mode function, which supports the high-fidelity digital synthesis of RF signals at up to 3.6 GHz. The combination of 2.5-GSPS bandwidth and 14-bit dynamic range with a direct-to-RF core is intended to allow equipment designers to use a single-transmit D/A converter architecture that eliminates a low-pass filter and one mixer or modulator stage. The device provides multi-carrier capability up to the Nyquist frequency in baseband mode and uses the mix-mode function to generate RF signals in the second and third Nyquist zones.
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