ST STHV748高性能超声波脉冲控制方案
ST 公司的STHV748是4路5级±90V, 2 A高性能高速超声波脉冲控制器,输出电压从0V到90V,工作频率高达20MHz,抖动低至20ps,具有抗交叉导通功能和低2次谐波失真特性,STHV748应用在医疗超声波图像,脉冲发生器,NDT超声波发送和压电传感器驱动器.本文介绍STHV748主要特性,方框图和典型应用电路.
World’s Most Integrated High-Performance Ultrasound Pulse Controller
STHV748: 5-level, ±90 V, 2 A high-speed pulser with four independent channels
This monolithic, high-voltage, high-speed pulser generator features four independent channels. It is designed for medical ultrasound applications, but can also be used for other piezoelectric, capacitive or MEMS transducers. The device comprises a controller logic interface circuit, level translators, MOSFET gate drivers, noise blocking diodes and high-power P-channel and N-channel MOSFETs as output stage for each channel,clamping-to-ground circuitry, anti-leakage, antimemory effect block, thermal sensor and HV receiver switch (HVR_SW) which guarantees a strong decoupling during transmission phase.Moreover the STHV748 includes self biasing and thermal shutdown blocks .
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