Electronic Design

CMOS 12-Bit DAC Updates At 400 Msamples/s

Suitable for satellite basestations and high-resolution imaging applications, Fujitsu Microelectronics' MB86061 digital-to-analog converter (DAC) combines a deep-submicron CMOS process with a novel segment-shuffling technique in a segmented current-steering architecture.

This device provides de-signers with an update rate of 400 Msamples/s at 12-bit resolution, with a spurious-free dynamic range (SFDR) of 86 dBc at a 10-MHz input and at 200 Msamples/s. Additionally, it offers ECL-compatible I/Os. A 1.25-V bandgap reference, incorporated on-chip, can be overdriven with an external reference. Compared with bipolar/biCMOS solutions, the 0.35-µm CMOS MB86061 significantly saves power, consuming 308 mW at 3.3 V and 300 Msamples/s.

Encased in a 64-pin quad-flat-pack (QFP), the MB86061 costs $48 each in lots of 1000. Designers can evaluate and verify performance under specific conditions with the DK86061-3 development kit, which costs $600.

Fujitsu Microelectronics, 3545 North First St., San Jose, CA 95134-1804; (800) 866-8608, (408) 922-9000; www.fujitsumicro.com.

See associated figure.

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