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ADC mixes excellent AC performance, extremely low power

Posted: 29 Jun 2005 ?? ?Print Version ?Bookmark and Share

Keywords:analog to digital converter? adc? ltc2255?

A 125MS/s, 14-bit analog to digital converter (ADC) that promises excellent AC performance and extremely low power was recently announced by Linear Technology Corp.

The new LTC2255 consumes 49 percent less power at 395mW, lowering the power budget and thermal considerations required for multiple channel devices. According to the company, this provides a significant advantage in applications where efficiency and cooling is critical, such as satellite receivers, wireless base stations and portable electronics. Linear Tech added that the LTC2255 is well placed to meet the needs of 3G and emerging 4G technologies, WiMAX and other wideband wireless applications where high performance ADCs play a key role in handling the demands of increasing network traffic.

The LTC2255 offers exceptional low-level input signal performance due to its high linearity, and it is designed with good margin relative to the sample rate for reliable performance over a wide temperature range. At 125MS/s sampling rate, it achieves excellent AC performance with 72.1dB SNR and 85dB SFDR at 70MHz, said the press release.

The LTC2255 releases alongside five new family members, expanding the existing pin compatible family of low power, high speed ADCs to higher sampling rates of 105Msps and 125Msps in resolutions of 10, 12 and 14 bits. Each device is available both commercial and industrial temperature grades.

As part of an extensive pin-compatible family, the LTC2255 comes in a conveniently small 5-by-5mm QFN package with integrated bypass capacitors, requiring only a small number of tiny external components. The LTC2255 eliminates the need for large and costly decoupling capacitors, affording the smallest solution size available, which eases PCB space constraints and allows for more compact, cost effective designs. With its small dimensions, low power and reduced external component requirement, designers can easily fit four LTC2255 ADCs where just one competing solution would fit.





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