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Maxim's ADC delivers -82dBFS, 80dB SNR and 96dBc SFDR

Posted: 06 Sep 2005 ?? ?Print Version ?Bookmark and Share

Keywords:maxim integrated products? max19586? analog-to-digital converter? adc?

Maxim Integrated Products rolled out a 16bit 80Msps analog-to-digital converter (ADC) that promises to set new industry standards in the elite class of ADCs that achieve 80dB or greater signal-to-noise ratio (SNR).

The new MAX19586 offers superior dynamic performance, including a noise floor of -82dBFS, 80dB SNR and 96dBc spurious-free dynamic range (SFDR) at an input frequency of 10MHz (-2dB input amplitude). According to the press release, this performance is several dBs better than the competition in noise floor, SNR and SFDR. Ted Tewksbury, managing director of Maxim's high-speed signal processing business unit, commented, "This remarkable performance is achieved at half the power required by the nearest competitor in a package that is one quarter the size." The new product can also sample input frequencies beyond 170MHz.

The MAX19586 is a 3.3V ADC with a fully differential wideband track-and-hold (T/H) and a 16bit converter core. Not only designed for excellent operation in the 2nd Nyquist region, the MAX19586 is also suitable for use with high-IF input frequencies. This makes the part ideal for high-performance digital receivers, said the press release. The part has as 1.8V digital supply voltage and a 2.56Vp-p full-scale input range.

Maher Matta, business manager for the company's high-speed converter products, added, "It is one thing to advance dynamic performance, but it is another thing to do that at almost half the power." At 1.1W power dissipation, the MAX19586 claims to use 48 percent less power than the nearest competitor. This ADC is also packaged in a space-saving 56-pin QFN-EP, one fourth the size of that same competitor. It is specified for the -40 to 85C industrial temperature range. "No other vendor has been able to provide this level of performance at such low power and in such a small footprint," Tewksbury added.

'Best SNR, SFDR'

The MAX19586 provides one of the best combination of SNR and SFDR in the industry. According to Maxim, this allows system engineers to design communication receivers with extra sensitivity and aids the design of multicarrier receivers. The 96dBc SFDR performance eases filtering requirements, and less expensive filters reduce system costs. The large dynamic range can also be utilized to simplify system design by eliminating the need for variable gain attenuators (VGA) or automatic gain control (AGC) blocks in the receiver. This is especially important in systems where the receiver is expected to digitize both weak (far) and strong (near) signals, added the company. With over 80dB of dynamic range, the system can capture both signals without having to change gain ranges.

In subsampling applications, the MAX19586 offers superior performance at high IF (77.2dB SNR at an input frequency of 168MHz), which allows system designers to eliminate RF down-conversion stages without sacrificing overall system performance. In instrumentation applications, the superb noise floor will quickly yield instruments with more measurement sensitivity than before, added Maxim.

Available in production and samples quantities, the MAX19586 is priced at $59.25 (1,000-up, FOB USA). Evaluation kits are also available to help shorten design time.

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