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TI Adds 500 MSPS, Flexible DAC to Robust Analog Portfolio for Wireless Infrastructure Applications

Analog Solutions Continue to Lower Overall Cost/Channel for Wireless Networks

May 1, 2003

DALLAS (May 1, 2003) -- Continuing to provide a broad portfolio of flexible analog products to wireless infrastructure basestation manufacturers, Texas Instruments (TI) (NYSE: TXN) announced today the programmable dual DAC5686, a digital to analog converter supporting up to four wideband CDMA carriers that requires 50% less power when compared to other competitive solutions. Offering designers´ three unique modes of operation as well as three separate clock modes, the DAC allows for a low input data rate with a programmable interpolation rate of 2x - 16x up to an output rate of 500 MSPS. See www.ti.com/dac5686.
The DAC is coupled with four additional devices to simplify the design time required for the wireless transceiver system of the basestation. The 12-bit, 80 MSPS ADS5410 analog to digital converter offers the lowest power at the lowest cost available. The THS4271 high-speed operational amplifier delivers ultra-low distortion with ultra low noise. TI's new low phase noise clock synthesizer - the CDC7005 - provides multiplying, dividing and jitter cleaning for optimal timing performance. Rounding out the system is the industry's first single-chip digital downconverter and upconverter, the GC5016, which connects seamlessly to the DAC5686.
"Highly flexible solutions provide system designers with the right level of hardware/software partitioning for cost-effective system-level products which can be brought to market quickly," said Robert Keller, systems engineering manager for Wireless Infrastructure Data Converters. "By developing these adaptable analog products for the transceiver system, TI is reducing the overall development cost for the basestation."
In addition to providing solutions for the analog transceiver system, TI offers high performance DSPs for the digital baseband and transcoding functions as well as logic solutions that enable designers to increase data throughput, shrink form factors and reduce power consumption. TI's power management products range from discrete devices to modular approaches, addressing the various technical wireless infrastructure system challenges.
The DAC5686 offers excellent performance for single and multi-carrier WCDMA operation. For single carrier WCDMA signals, the DAC5686 has demonstrated ACPR better than 68 dBc at frequencies up to 122.88 MHz. For dual carrier WCDMA signals, ACPR better than 71 dBc is possible up to 61.44 MHz.

Inherent Flexibility Expands Designers Options

The DAC5686 can be used in three clock modes - PLL mode, DAC clock mode and Data/DAC clock mode. It is also configurable in three modes of operation:

  • Dual-channel - Used for baseband modulation or a two-channel digital IF system. The dual DACs and datapaths operate independently. The interpolation filters increase the DAC update rate, resulting in reduced sin x/x roll off and relaxed requirements for analog post-filtering. 
  • Quadrature Modulation Mode - Converts a complex digital baseband signal to IF frequency after upsampling. Used for IF greater than 50 MHz. 
  • Single Sideband Upconversion Mode - Complex IF output allows offset of signal after analog quadrature modulator, placing LO feedthrough and unwanted sideband signal out of band.

Key Features

  • 500 MSPS maximum DAC update rate 
  • Low power dissipation - less than 400 mW 
  • Selectable 2x to 16x interpolation, dual channel 
  • Differential scalable current outputs: 2mA to 20mA 
  • Independently programmable gain and offset 
  • 1.8V digital/3.3V analog supply 
  • 100-pin TQFP PowerPADTM package 
  • Sin x/x compensation filter