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DACs reduce power, size

Posted: 11 Nov 2008     Print Version  Bookmark and Share

Keywords:D/A converters  spurious-free dynamic range  full-scale current 

Aimed at communications, industrial and instrumentation equipment, Analog Devices Inc. has announced eight TxDAC transmit D/A converters, each integrating two D/A converters on a single device.

Dissipating 220mW at their maximum sample rate, the AD911x series of dual TxDAC devices consume 40 per cent less power and are one-third the size of competing transmit D/A converters, while achieving 10dB better SFDR (spurious-free dynamic range) performance, according to ADI. The AD971x series of dual TxDAC devices, with 2mA full-scale output current consume 70 per cent less power than competing products, ADI added.

Each TxDAC integrates two 14-, 12-, 10- or 8bit D/A converters with sample rates up to 125MSPS. These devices allow designers to adjust the full-scale current from 1 to 4mA or 4 to 20mA with a single, pin-compatible architecture and common software code.

The AD971x TxDAC series features 1- to 4-mA maximum differential output current. Power dissipation at 2mA output current is 37mW at 10MSPS and 53mW at 50MSPS. The AD911x TxDAC series has 4- to 20-mA maximum differential output current. The AD911x devices achieve 85dB SFDR to 10MHz.

The devices come in a small, 6mm—6mm, Pb-free, 40-lead LFCSP.

Prices range from Rs.297.72 ($5.95) to Rs.475.35 ($9.50) each in 1K unit quantities.

-Ismini Scouras

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