原标题：ST STHV64SW 64路低失真高压模拟开关解决方案

　　ST公司的STHV64SW是64路低失真高压模拟单个开关,设计用于医疗超声应用,用来驱动压电晶体,容性或MEMS变送器或工业应用如通用高压开关.器件包括了用兵于串行通信的移位寄存器,自偏压高压MOSFET栅极驱动器,大功率N沟MOSFET,用于每个开关的泄漏电阻,热传感器和欠压锁住,此外还包括自偏压和热关断.开关能提供高达±3 A峰值输出电流.输入和输出峰-峰值200V,三种不同的工作电压:从-100V到+100V,从0V到200V,从-200V到0V.开关具有很快的输入转换速率(无负载时40V/ns),仅+3.3V低电压电源,轨到轨输入信号,低开态电阻,通路间的串音非常低,具有非常低的寄生电容,输出的泄漏电阻42 kΩ,热和欠压保护.通过串行接口来控制,20MHz数据移位时钟频率和带闭锁的级联串行寄存器.主要用在医疗超声图像,NDT超声发送,压电传送器驱动器和工业应用.本文介绍了STHV64SW主要特性,评估板STEVAL-IME015V1主要特性,硬件框图,板布局图,应用框图和电路图,材料清单.

　　The STHV64SW is an integrated circuit which features 64 independent switches. It is designed for medical ultrasound applications, but can also be used for drivingpiezoelectric, capacitive or MEMS transducers, and in industrial application such as generic high voltage switches.

　　The STHV64SW comprises a shift register for serial communication, self-biased high voltage MOSFET gate drivers, high power N-channel MOSFETs, bleed resistance for each switch, thermal sensor and undervoltage lockout. Moreover, the STHV64SW includes self-biasing and thermal shutdown blocks. The switches are capable ofproviding up to ±3 A peak output current.

　　STHV64SW主要特性:

　　• 200 V peak-to-peak input and output signal

　　• Three different operating ranges:

　　– From -100 V to +100 V

　　– From 0 V to 200 V

　　– From -200 V to 0 V

　　• Very fast input slew rate (40 V/ns without load)

　　• Only +3.3 V low voltage supply

　　• Rail-to-rail input signal

　　• Low on-resistance

　　• Very low cross-talk between channels

　　• Low parasitic capacitance

　　• 42 kΩ bleed resistor on the outputs

　　• Thermal and undervoltage protection

　　• Latch-up free

　　• Control through serial interface

　　• 20 MHz data shift clock frequency

　　• Cascadable serial register with latches

　　STHV64SW应用:

　　• Medical ultrasound imaging

　　• NDT ultrasound transmission

　　• Piezoelectric transducer drivers

　　• Industrial

　　评估板STEVAL-IME015V1

　　Evaluation board based on the STHV64SW high voltage switch matrix for ultrasound imaging applications

　　The STEVAL-IME015V1 evaluation board is based on the STHV64SW high voltage switch matrix, designed for ultrasoundimaging applications.

　　The system can switch 64 independent high voltage channels through switch input and output connections on standard2.54 mm headers, as well as through digital I/O’s. Each channel can be used as a switch for external transmitters or receivers,or to directly drive transducers for low frequency applications.

　　A standard ultrasound probe connector can be soldered to the board to help evaluate the performance of the STHV64SWdevice in your application.

　　图1.评估板STEVAL-IME015V1外形图

　　评估板STEVAL-IME015V1主要特性:

　　• Suitable for ultrasound imaging applications

　　• 64 high voltage channels

　　• Switch input and output header connectors

　　• High voltage and low voltage connectors to power the STHV64SW

　　• Digital input and output header connector

　　• Optional standard probe connector footprint

　　图2.评估板STEVAL-IME015V1硬件框图

　　评估板STEVAL-IME015V1材料清单: