THAT Corp Rolls Out VCA IC Part

Milford, MA (December 13, 2007)--THAT Corporation has unveiled its 2162, the company's first dual Blackmer voltage-controlled amplifier (VCA) IC, designed for multichannel VCA applications.
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Milford, MA (December 13, 2007)--THAT Corporation has unveiled its 2162, the company's first dual Blackmer voltage-controlled amplifier (VCA) IC, designed for multichannel VCA applications.

Les Tyler, THAT's president, notes, "The 2162 is basically a pair of our famous Blackmer VCAs integrated into one package. The part delivers great performance in a tiny package, offering 118 dB dynamic range, 130 dB gain-control range and distortion under 0.1 percent without any adjustment. Performance-conscious designers can reduce THD further by using an external trim, if desired."

Packaged in a 16-pin QSOP package, the 2162's two VCAs are independent of each other, sharing only their power supply connections. Both positive- and negative-sense control ports are brought out separately for each VCA. As a result, the part can be configured for a range of stereo and multichannel applications.

Gary Hebert, THAT's chief technology officer and designer of the IC, points out that "the 2162 operates over a wide range of (split) power supply voltages, from ±16 Vdc to as low as ±2.25 V. It draws only 3 mA at ±5 V supplies, so it is suitable even for battery-operated applications. Moreover, our Blackmer architecture uses current, not voltage, for input and output signals. So, the 2162's wide dynamic range is hardly compromised by low-voltage operation."

Fabricated in THAT's proprietary dielectric isolation (DI) process at its Milpitas, CA IC foundry, the 2162 reportedly delivers discrete analog circuit performance with the reliability and cost benefits of an integrated circuit. Hebert explains, "Conventional junction-isolated (JI) ICs suffer from parasitic diodes (and their associated capacitance) between critical components and a common substrate which can compromise performance. Discrete implementations (on a PCB) suffer from temperature drift, and difficulty in matching the discrete components. Our DI process significantly reduces many of the parasitics suffered by JI ICs, and maintains excellent thermal tracking and device matching over the entire circuit. We get the best of both discrete and monolithic design, which we put to good use in the 2162."

THAT Corp.
www.thatcorp.com