Integrated Single Supply Broadband Modem Mixed Signal Front End (MxFE®)

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Replacement Parts

Rochester Electronics is the only authorized source of Analog Devices' products that have previously been discontinued or have become obsolete. Product availability should be checked directly with Rochester Electronics.

Product Details

The AD9975 is an integrated single supply broadband modem mixed signal front end (MxFE) IC similar to the AD9875. Like the AD9875, this device contains a transmit path Interpolation Filter, and DAC along with a receive path that includes a PGA, LPF and ADC as required for a variety of broadband modem applications. Also on-chip is a PLL clock multiplier, which provides all required clocks from a single crystal or clock input.

Where the AD9975 and AD9875 differ is in the digital interface. The AD9975 has a digital interface that uses a single 10-bit data bus that is shared between the Tx and Rx paths. The AD9875 also includes a 10-bit data bus, but uses 5-bit interleaved nibbles for both the Tx and Rx paths, providing full duplex operation.

The AD9975 digital transmit and receive ports have individual TX/RX clocks and TX/RX enable lines. This interface connects directly to Homelug 1.0 PHY/MAC chips including the INT5130 from Intellon and CX11647 from Conexant. The AD9975 is available in a space-saving 48-lead LQFP package and is specified over the commercial (-40ºC to +85ºC) temperature range.