您现在的位置：首页 > 技术方案 >工业控制 > ST STHV1600 16路的高压高速超声波发生器解决方案

ST STHV1600 16路的高压高速超声波发生器解决方案

来源： eccn

2019-09-12

类别：工业控制

拍明

原标题：ST STHV1600 16路的高压高速超声波发生器解决方案

　　ST公司的STHV1600是集成了发送波束形成器的 16路±100 V, ±2/4 A的高压高速超声波发生器.模拟部分每路提供了电平转换器,抑制噪音二极管,两个相同的高压P沟和两个相同的高压N沟MOSFET,箝位到地的电路,看漏电抗存储区块,热传感器,再循环电流保护和T/R开关架构,峰-峰输出信号0-200V,工作频率高达30MHz,每路功耗150mW,LVDS /CMOS数字输入,主要用在医疗超声图像,脉冲波发生器,NDT超声波发送,压电换能器驱动器.本文介绍了STHV1600主要特性,以及评估板STEVAL-IME014V1B主要指标,电路图和材料清单.

　　This monolithic, high-voltage, high-speed pulse generator features 16 independentchannels and integrates a 16-channel beamformer for pulse generation in multichannel medical ultrasound applications targeted at low power portable systems.A pure analog section provides each channel with voltage level translators, noiseblocking diode function, two identical high voltage P-channel and two identical highvoltage N-channel MOSFETs as the output stage (the two half bridges are called TX0and TX1), clamping to-ground circuitry, anti-leakage, anti-memory block, thermalsensor, recirculation current protection and a T/R switch structure which guaranteeseffective isolation during the transmission phase.

　　Each channel can support up to five output levels with two independent half bridges.Both PW output stages (TX0 and TX1) are able to provide up to ±2 A peak outputcurrent, independent from the HV power supply pins. The two half bridges can bedriven in parallel with a current capability up to ±4 A. The clamp circuit, used to carrythe output pin XDCR to GND with a resistance of 11 Ω, has a current capability of upto 2 A during the transition. Each channel is provided with strong recirculationprotection on the high voltage output node (XDCR) to preserve the device usinginductive load without any external diode protection. The 16 independent T/Rswitches comprise an active circuit that can be used in both a dedicated RX chainper channel or in a multiplexing configuration.

　　The STHV1600 also includes some global blocks, thermal protection, undervoltageon VDDP3V3, VDDM3V3 and DVDD, POR on DVDD, global self-biased high-voltageMOSFET gate drivers with internal check of the correct value, and a check of the HV supply values. Twelve low voltage capacitors are included in the package. Ceramic capacitors are mandatory on the HV supplies and VDDP3V3 and VDDM3V3 on thePCB. The ball-out is designed to simplify application board routing and to preventunexpected coupling between HV and LV.

　　All functions of the STHV1600 are managed by a digital core logic working at amaximum clock frequency of 200 MHz. This block is responsible for managingchannel delay transmission used in beamformer, waveform generation andcompression algorithm, store setting and data, managing all device operations in thecorrect sequence.

　　Starting from an IDLE state in which device can be configured by SPI interface and channels are in CLAMP state, transmission TX starts after the rising edge of theexternal trigger signal is provided. When transmission ends, a RX_WAIT state isperformed, forcing channels in CLAMP state to clean signals from previous pulsing.

　　The automatic receiving state, RX, starts and persists until a falling edge of theexternal trigger signal is provided, putting the device in the initial IDLE state. It alsosets all configurations to perform transmission in continuous mode (CW) when apulse sequence must be repeated indefinitely (until the falling edge of the trigger isprovided) or pulse waves (PW) when a finite pulse sequence must be performed.

　　STHV1600主要特性:

　　• 0 to 200 V peak-to-peak output signal

　　• Up to 30 MHz operating frequency

　　• Power-up/down sequence free

　　• Gate driver self-biased architecture; no filtering capacitors required

　　• Pulsed wave (PW) mode operation:

　　– 5/3 level output

　　– ±2 A / ±4 A source and sink current

　　• Continuous wave (CW) mode operation:

　　– 150 mW power consumption/channel

　　– 270 fs RMS jitter (100 Hz-20 kHz)

　　– -147 dBc/Hz @ 1 kHz phase noise

　　• Elastography mode operation

　　• Programmable fine-tuning delays to minimize second harmonic distortion

　　• Fully integrated real clamping-to-ground function

　　– 11 Ω synchronous active clamp

　　– ±2 A source and sink current

　　• Fully integrated T/R switch

　　– 9 Ω ON resistance

　　– 28 pF parasitic capacitance

　　– Compliant with receiver multiplexing function

　　• Auxiliary integrated circuits

　　– Noise blocking diode function

　　– Recirculation current protection

　　– Anti-memory feature

　　– Thermal protection

　　– Undervoltage protection and bias supply checks

　　• Programmable power management to optimize the performance into a probe

　　• TX Beamforming in transmission mode

　　– Programmable single-channel delay for beam steering and beam focusing

　　– Clock frequency up to 200 MHz

　　– Delay from 0 to 327 μs with 5 ns of minimum resolution

　　– 425 ns minimum delay table writing time

　　• Embedded memory to store transmission patterns

　　– 65 kbits

　　– Waveform compression algorithm

　　– Up to 256 non repetitive states

　　– Up to 4 states sequence repetition up to 218 times

　　• Easy driving control

　　– Control through serial interface

　　– Few input signals to drive several devices

　　– Single interrupt as alert signal

　　– Fully automatic and programmable single trigger to manage TX/RX phases

　　– Anti-glitch on trigger signal during TX phase

　　• Checksum and parity check

　　• Very low package thermal resistance

　　• Latch-up free due to HV SOI technology

　　• Only a few passive components required

　　• LVDS/CMOS digital inputs

　　STHV1600应用:

　　• Medical ultrasound imaging

　　• Pulse waveform generators

　　• NDT ultrasound transmission

　　• Piezoelectric transducer drivers

　　评估板STEVAL-IME014V1B

　　The STEVAL-IME014V1B evaluation kit, based on the STHV1600 16-channel high voltage pulser for ultrasound imagingapplications, can be used to evaluate the characteristics and functionality of the HV pulser.

　　Four preset programs are available to test the pulser in typical conditions, and output waveforms can be displayed on anoscilloscope by connecting the scope probe to the relative connectors.

　　A graphical user interface is available to help you change waveforms and configurations easily.