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Signal conditioner.The AM400 single-chip current and voltage interface circuit provides simultaneous and independent current (4-20mA) and voltage (5-10V) outputs. They are surface mount or DIP devices specially designed to process the differential output signal from a wide range of bridge circuits found in pressure sensors, humidity sensors and other sensing devices. It has a wide operating temperature range, from -40š to +85šC, for all types of applications. Two parallel voltages are available (analog driver and A/D) and current output (2 and 3-wire operation). All output ranges are independently adjustable. Using the A/D output, the sensor system can be digitally calibrated with external microprocessor. Servoflo Corp, 75 Allen St, Lexington, MA 02173. 781-862-9572. Circle 650.
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Screen encoder. This low-power, single IC interfaces any four- or
eight-wire resistive touch screen to PS/2-equipped computers and chip sets. Ideal for
portable systems and interactive kiosks, the IC offers an advanced algorithm for enhanced
motion control, click-to-select functionality and an extra port for hot-plug connection of
an external pointing device. A special command protocol allows the touch screen to
operated in either relative (mouse-like) or absolute mode. USAR Systems, 568
Broadway, New York, NY 10012. 212-226-2042. Circle 651.
Audio DAC. The AD1853 is a 24-bit stereo audio D/A converter
that meets the 192 kHz audio sample rate standard for DVD players. The IC combines
proprietary data conversion technology with a sigma-delta converter core to deliver audio
performance at every sample rate from 32kHz to 192kHz. It has a superior signal-to-noise
ratio of 117dB stereo and 120dB mono, not muted at 48kHz. Analog Devices,
804 Woburn St, Wilmington, MA 01887. 800-ANALOGD.