Relying on an active-clamping architecture to reduce second-harmonic output and allow complete control of each driver's output stage, the
MAX4940/MAX4940A quad/dual, high-voltage digital pulsers reportedly improve image quality in ultrasound applications. Typically delivering 2A of output current, the devices are independently configurable to enable uni- or bi-polar pulsing in high-voltage systems from low-voltage logic inputs. The
MAX4940A integrates blocking diodes to support five levels of pulsing while the
MAX4940 is supports two levels. Both devices include a thermal-shutdown circuit and operate from a single positive supply up to +220V, a single negative supply down to -220V, or dual ±110V supplies. Prices start at $10.90 each/1,000. MAXIM INTEGRATED PRODUCTS, Sunnyvale, CA. (800) 998-8800.
