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New family of micropower comparators

27.05.2007

National Semiconductor, a leading provider of high-end analog signal processing products, has launched a family of micro-power, high-speed comparators. The LMH7322 is a dual comparator that has low power consumption (21 mA nominal) and a propagation delay of less than 1 ns (700 ps nominal).

The LMH7220 features LVDS (Differential Data Transfer Method) and RSPECL (Row Peak Positive Emitter Coupled Logic) outputs. National Semiconductor will begin testing a quad comparator with a specification similar to the LMH7322 in late 2007. The LMH7220 is a high speed, low power single comparator with a supply voltage range of 2,7V to 12V.

The output of the LVDS comparator provides a 325 mV signal into a 100 ohm balanced transmission line, providing a balanced output with low sensitivity to noise and EMI (electromagnetic interference) for interfacing with FPGA (programmable matrix logic chips) and A SIC (special purpose integrated circuits) having LVDS inputs. The LMH7220 has a wide output voltage range from 10V to 200mV below ground level. The LVDS signal optimizes power consumption compared to differential ECL (emitter-coupled logic) outputs.

Due to the characteristics of the output driver, power consumption remains low even as the data rate increases. The comparator is available in a miniature 6-pin TSOP package.

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