Linear Tech kicks off a new family of dual 14-bit A/D converters

Milpitas, Calif. — Linear Technology Corp. is rolling out its first family of dual 14-bit analog-to-digital converters (A/D converters) with 100 MHz 110 dB channel isolation performance at only 445 mW total power consumption.

The LTC2299 family of low power, high speed dual A/D converters provide excellent channel-to-channel isolation, while achieving extremely low power consumption. At just 445 mW, or about 222 mW per channel, the 14-bit, 80 Msamples/s LTC2299 consumes less power than even slower competitors. The device is suited for base station applications, achieving 73dB signal-to-noise ratio (SNR) and 85dB spurious free dynamic range (SFDR) at 70 MHz. For higher intermediate frequencies (IFs), it excels with 72.6dB SNR and 80dB SFDR up to 140 MHz.

The LTC2299 is one of 14 new dual A/D converters introduced today by Linear Technology, as part of its expanding family of low power, high speed A/D converters, which range from 10 Msamples/s to 80 Msamples/s at 10-bit, 12-bit and 14-bit resolution (see following table). In addition to base station applications, these low power dual A/D converters are practical for other communication systems and high-end medical imaging equipment.

A few other manufacturers like Analog Devices Inc. and Datel Inc. have developed dual high-resolution (14-bit) A/D converters in response to growing demand for multichannel applications like medical imaging, communications, and for various spread-spectrum frequency and instrumentation applications. By this time next year, look for a lot more of these devices. Texas Instruments Inc. plans to offer 14-bit dual version A/D converters in the near future as well. Previously, Linear Technology offered a two-channel 14-bit A/D converter. A dual A/D converter has two converters in one package, while a two-channel A/D converter has a two-channel multiplexer and one converter in one package.

The LTC2299's small 9mm x 9mm QFN package makes this dual A/D converter ideal for low power single carrier base stations where the matching performance of the in-phase (I) and quadrature (Q) channels is critical. Crosstalk between channels stays below -110dB from low input frequencies all the way up to 100 MHz. The system footprint of the LTC2299 is small since few external bypass capacitors are needed. Optimized for undersampling with wide bandwidth, it also suits multi-carrier base station designs that require multiple receive channels in a small area. Pin-compatible versions at sample rates of 65 Msamples/s, 40 Msamples/s, 25 Msamples/s and 10 Msamples/s feature even lower power —as low as 60 mW per channel. Pin-compatible 12-bit and 10-bit versions at each speed are also in full production.

All 14 dual A/D converters just announced are now in production and are packaged in 9mm x 9mm, 64-pin QFN packages.

Summary of Features: LTC2299 Family

  • Sample Rate: 80Msps/65Msps/40Msps/25Msps/10Msps
  • 73dB SNR up to 70MHz Input
  • 85dB SFDR up to 70MHz Input
  • 110dB Channel Isolation at 30MHz
  • 575MHz Full Power Bandwidth S/H
  • Multiplexed or Separate Data Bus
  • Single 3V Supply (2.7V to 3.4V)
  • Low Power Dissipation: 445mW/410mW/240mW/150mW/120mW
  • Selectable Input Ranges: 0.5V or 1V
  • Clock Duty Cycle Stabilizer
  • Shutdown and Nap Modes
  • 64-pin, 9mm x 9mm QFN Package
    • For more information, please call 1-800-4-LINEAR for literature only or visit:

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