12/14-bit ADCs break
sub-100-mW power barrier
Parts consume half the power of their nearest competitor
Based on low-power high-speed continuous-time delta-sigma (CTΔΣ) technology (see Electronic Products Oct. 2005, p. 22 ), the 12-bit XT11200 and 14-bit XT11400 A/D converters consume 70 mW while operating at 20 to 40 Msamples/s�claimed to be half the power consumption of the nearest competitor. Ideal for medical imaging, ultrasound, communication systems, and sensing, these devices also simplify system design by integrating a precision sample clock.
The CTΔΣ architecture eliminates antialias filtersallowing the converter to sample the entire Nyquist frequency zone (0 to 20 MHz) with almost no wasted bandwidth. The XT11400 has an SNR of 76 dB and a THD of –28 dB, while the XT11200 features an SNR of 71 dB and THD of –78 dB.
The devices can handle 4-Vp-p input signals while operating from a 1.2-Vdc supply. Housed in 40-pin QFN packages, the parts require no differential input buffer. (XT11200, $9.95 ea/1,000�prod qty, 2nd qtr 2006; XT11400, $18 ea/1,000�1st qtr 2006.)
Xignal Technologies
Unterhaching, Germany
Mike Levis 011-49-89-32-22-720
Fax 011-49-89-32-22-7214
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