Norwood, Mass. - Three additions to Analog Devices Inc.'s TxDAC family of digital-to-analog converters are said to support 3-volt operation without sacrificing ac and dc performance.
The 14-bit AD9744, 12-bit AD9742 and 10-bit AD-9740 are optimized for transmit signal paths in a communications infrastructure, including cable headend systems, optical-networking systems and multicarrier third-generation basestations. The converters can also be used in portable instrumentation, test equipment, and optical monitoring and control systems.
The AD9744 offers typical integral nonlinearity of plus/minus 0.8 least significant bit and differential linearity of plus/minus 0.5 LSB at 14 bits. The spurious free dynamic range is 83 dBc and the signal-to-noise ratio 77 dB at 5-MHz output. The high-speed, single-ended CMOS clock input supports 165-Msample/second conversions.
All three devices have differential current outputs from 2 to 20 milliamps and include a 1.2-V temperature-compensated bandgap voltage reference. They operate on a single 3-V to 3.6-V supply and consume 135 mW. Power dissipation can be reduced to 60 mW by lowering the full-scale current. Sleep mode is available.
The devices are sampling now in 28-lead small-outline IC and thin shrink small-outline packages. A 32-lead chip-scale package is planned that will be 87 percent smaller than the standard SOIC.
In 1,000-piece quantities, the AD9744 sells for $9, the AD9742 for $6.95 and the AD9740 for $4.95.
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