TxDac Dacs aid energy efficient product design

Analog Devices has introduced eight TxDac transmit digital-to-analogue converters (Dacs), each integrating two Dacs on a single device.

The pin-compatible dual TxDac converters are designed for communications, industrial, instrumentation and other demanding high performance applications.

Dissipating 220 mW at 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 Dacs, but achieve 10 dB better SFDR (spurious-free dynamic range) performance.

The AD971x series of dual TxDac devices, with 2-mA full-scale output current, are even more energy efficient.

Each TxDac integrates two 14-, 12-, 10- or 8-bit digital-to-analogue converters with sample rates up to 125 MSPS (mega-samples-per-second).

These devices allow designers to adjust the full-scale current from 1 to 4 mA or 4 to 20 mA 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 2 mA output current is only 37 mW at 10 MSPS and 53 mW at 50 MSPS.

This is one-third that of competing transmit Dacs, making the series ideal for small, limited-range wireless equipment such as picocell and femtocell base stations and battery-powered medical, industrial and instrumentation applications.

The AD911x TxDac series has 4- to 20-mA maximum differential output current.

It dissipates 40 per cent less power than other devices in its class and is suited to automotive, medical, instrumentation and communications applications where channel densities must be maximised without the addition of cooling fans or where environmental considerations drive a reduction in power consumption.

The AD911x devices achieve 85-dB SFDR to 10 MHz.

Features of the Dacs include an internal calibrator for improved INL and DNL performance up to a 10-MHz output frequency, an internal voltage reference, independent full-scale current control, on-chip load and common-mode resistors and a pair of auxiliary Dacs for generating control voltages or for system calibration.

The TxDac devices offer a seamless interface to ADI's high performance quadrature modulators such as the ADL5370.

The ADA4899-1 and ADA4841-2 operational amplifiers are suitable for single-ended or differential-buffered voltage output, respectively.

Analog Devices' high speed converters, such as the AD911x TxDac family, operate seamlessly with ADI's AD9513 clock distribution IC and new line of voltage regulators, including the ADP3334 and ADP3333.

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