Low-power TxDACs fit comm, industrial, and portable apps - Embedded.com

Low-power TxDACs fit comm, industrial, and portable apps

A low-power generation of the TxDAC transmit digital-to-analog converters (DACs) meets the requirements of communications, industrial instrumentation, and portable applications. Developed by Analog Devices, the AD970x family reduces power dissipation by up to 70% over previous DAC offerings. As a transmit-quality converter, the devices suit applications that need to efficiently synthesize broadband signals. The DACs support update rates at 175 Msamples/s.

The AD970x family integrates an on-chip voltage reference and Rset and Rload resistors, lowering the component count and bill of materials. The devices also feature common mode shift capability, minimizing the need for level-shifting circuitry when interfacing with other analog components. This level of integration simplifies analog design and reduces pcb area.

The family is comprised of four products: the AD9707 14-bit DAC; and the AD9706, AD9705 and AD9704, which are 12-, 10-, and 8-bit DACs, respectively. The family features a spurious-free dynamic range (SFDR) of 86 dBc and intermodulation (IMD) of 70 to 50 MHz. All of the devices share the same interface, small outline package, and pin-out, providing an upward or downward component selection path based on performance, resolution, and cost. At 3.3 V, the parts dissipate 35 mW, and at 1.8 V dissipate 12 mW. Power dissipation can be further reduced by 15 mW by lowering the full-scale current output. Sleep and power down modes reduce dissipation to 5 mW for low-power idle periods.

The devices are available in 28-lead TSSOP and 32-lead LFCSP packaging (including an optional SPI interface for a higher level of programmability). The parts are sampling now with production quantities available in October. Prices range from $2.75 to $5.75 in 1000-unit quantities, depending on resolution. For more information, visit www.analog.com/AD9707.

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