DAC reduces cable head-end footprint

Analog Devices, Inc. has introduced an 11-bit digital-to-analog converter (DAC) that enables cable television and broadband operators to synthesize the cable spectrum up to 1 GHz into a single RF port consuming a maximum of 1.1 W of power. The manufacturer states that AD9737A 2.5-GSPS DAC’s wide bandwidth and dynamic range enable cable infrastructure designers to increase QAM (quadrature amplitude modulation) channel density by 20 times over present cable modem implementations to improve next-generation services such as interactive television, high-definition broadcasts and new specialty channels.

Key features:

  • Operates from 1.8-V and 3.3-V supplies for a total power consumption of 1.1 W maximum
  • Dual-port interface with double-data-rate LVDS data receivers supports the maximum conversion rate of 2.5 GSPS
  • Output current is programmable from 8.7 mA to 31.7 mA
  • Not subject to US data converter export restrictions

The AD9737 is sampling and in production now. Priced $37.14 each in 1,000 qty.

Complementary components include ADI’s ADCLK914 clock/data buffer that drives the clock input of the AD9737A D/A converter with a 2 V differential swing that achieves jitter performance of 110 fs.

More Information:
Product web page  

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