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[原创] Microchip HV7358 16路3级高压(HV)超声波发送方案

关键词:医疗电子 超声波发送器 超声图像系统 HV7358

时间:2020-03-03 11:27:12       来源:中电网

microchip公司的HV7358是16路3级高压(HV)超声波发送器,内置了数字波束形成器.每路能开关到高达±80V,并放电回到0V.输出源和沉电流大于1.6A,具有快速的上升和下降时间.有源放电具有±1.6A电流,快速回到地.HV7358其它特性还包括可编程输出电流.输出电流的编程是通过I2C接口来进行.所有16路内置了输出保护二极管和钳位二极管.器件具有16路T/R开关,接收钳位电流和有源RTZ电路,而有源RTZ电流典型RON为300Ω.HV7358内部具有低抖动PLL时钟乘法器,用来产生内置数字波束形成器的延迟时钟.时钟输入采用LVDS差分系统时钟,PLL模式的频率从30MHz到80MHz;而非PLL模式的频率从30MHz到200MHz.时钟乘法器由x1, x2, x3, x4, x5, x6和x8可编程,最大延迟时钟频率高达200MHz,允许增量延迟低至5ns.主要用在医用手持笔记本尺寸和小车尺寸超声图像系统,NDT超声脉冲发生器和工业应用,以及HV脉冲图像发生器.本文介绍了HV7358主要特性,功能框图,组成64路脉冲发生器和波束成形器框图,以及评估板HV7358DB1(ADM00732)和MUPB002 (ADM00900)主要特性,电路图,材料清单和PCB设计图.

The HV7358 is a 16-Channel, 3-Level HV ultrasound transmitter with built-in digital beamformer. Each channel is capable of swinging up to ±80V with an active discharge back to 0V. The outputs can source and sink more than 1.6A to achieve fast output rise and fall times. The active discharge is also capable of ±1.6A for a fast return to ground. The HV7358 additionally features the programmable output current. The output current can be programmed via the I2C Interface. All 16 channels have built-in output protection diodes and clamp diodes. The HV7358 features 16 Integrated T/R switches, a receive damping circuit and an active RTZ circuit. The active RTZ circuit has a typical RON of 300Ω. The active RTZ circuit activates to discharge the transmitter’s output internal node when the transmit burst ends.

The gate drivers for the output MOSFETs are powered by built-in linear floating regulators referenced to VPP and VNN. This direct coupling topology of the gate drivers eliminates the need for the gate driver and floating power supply circuit.

The HV7358 features an internal low-jitter PLL clock multiplier for generating the delay clock for the built-in digital beamformer. The clock input has to accept an LVDS differential system clock with frequencies from 30 MHz (min.) to 80 MHz (max.) in PLL mode and a frequency from 30 MHz (min.) to 200 MHz (max.) in Non-PLL mode. The clock multiplier is programmable by x1, x2, x3, x4, x5, x6 and x8, and the maximum delay clock frequency can be up to 200 MHz, allowing incremental delays down to 5 ns. This feature eliminates the need for the power-hungry external clock synthesizer/multiplier to generate the high-frequency delay clock from the system/sampling clock. The transmitter outputs are synchronized with the delay clock to reduce phase noise.

HV7358主要特性:

• 16-Channel with Active Return to True Zero
• Up to ±80V Output Voltage and ±1.6A Output Current
• Programmable Output Current: 0.3A, 0.5A, 1.0A and 1.6A
• -40 dB Second Harmonic at 5 MHz, ±70V, 5-Cycle
• Built-in T/R Switch, Damper and Protection Diodes
• Built-in Linear Regulators for Floating Gate Driver
• Internal Low Jitter Phase-Locked Loop (PLL) Clock Multiplier for TXCH Clock
• 30 MHz to 80 MHz Input Clock Frequency in PLL Mode
• 30 MHz to 200 MHz Input Clock Frequency (in Non-PLL Mode) over Low-Voltage Differential Signaling (LVDS) Connection
• PLL Frequency Integer Multiplier x1, x2, x3, x4, x5, x6, x8
• Internal Clock Frequency (fC), up to 200 MHz to Allow a 5 ns Delay Resolution
• Ensured Synchronize Internal Transmit Clock Across Devices in the Same Phase
• PLL Circuit can be Bypassed and Shut Down to Reduce the Power Consumption
• Built-in Active Bleeder Circuit on VPP and VNN for Rapid Capacitor Discharging to Reduce the Time Required for Transmit Voltage Adjustment
• Configurable 12-Bit Delay for Beamform per Channel
• Stores up to Four TXCH Patterns with the Optional Local tOFF Counter, Allowing the TXCH Apodization Use of the Pulse-Width Modulator (PWM)
• TXCH Patterns, up to 255 Pulses with Programmable Pulse Width and Frequency
• Programmable Continuous Wave (CW) Frequency Divide Ratio, from 1 to 255 of the Input Clock Frequency
• Set-and-Go Feature in CW Mode Reduces the Digital Cross-Coupled Noise on PCB
• High-Speed LVDS SPI, Typical 200 MHz Operation Allows Fast Device Programming
• SPI Group Broadcast Mode for Fast Data Writing
• Two-Wire I2C Interface for Control and Status Reading
• 13 mm x 13 mm TFBGA Package with 0.8 mm Pitch

HV7358应用:

• Medical Portable Notebook Size and Trolley Size Ultrasound Imaging System
• NDT Ultrasound Pulsers and Industrial Use
• HV Pulse Pattern Generators

图1.HV7358功能框图
 
图2.多个HV7358组成64路脉冲发生器和波束成形器框图

图3.快速SPI接口连接电路框图

评估板HV7358DB1(ADM00732)和MUPB002 (ADM00900)提供平台测试HV7358特性

The HV7358 is a 16-channel, 3 level, ±80V, 1.6A ultrasound transmit beamformer. It is designed primarily for portable medical ultrasound image applications, but it is applicable to cart-based medical ultrasound systems, as well as NDT applications. The output MOSFET transistors’ maximum current can be programmed to ±0.3A, ±0.5A, ±1.0A or ±1.6A. Each channel has a T/R switch, RX-damp switch, bleed resistor and diode clamps to VPP and VNN.

Internal floating power supplies generate the gate drive voltages required for the TX output FETs. These supplies function at any VPP/VNN voltage.

The 200 MHz clock retiming capability provides low jitter in CW, PW and B mode. The clock synchronization realigns all internal logic clock signals to a master clock, reducing the various propagation delays caused by any jitter from the external FPGA.

The HV7358 features an internal low jitter PLL clock multiplier for generating the delay clock for the digital beamformer. The clock input can accept LVDS differential signals from 30 MHz (min.) to 80 MHz (max.) in the PLL mode and from 30 MHz to 200 MHz in the non-PLL mode. At 200 MHz, the incremental delay is 5 ns. The clock multiplier is programmable by x1, x2, x3, x4, x5, x6 and x8. The transmitter outputs are synchronized with the delay clock to reduce phase noise.

图4.评估板HV7358DB1外形图

评估板HV7358DB1主要特性:

• HV7358DB1 16-channel, ultrasound, beamforming transmitter
• Designed to work with the Microchip Ultrasound Platform Board (MUPB002)
• Three-level output: VPP, VNN and RTZ
• VPP/VNN up to ±80V high voltages
• Up to ±1.6A source and sink current capability
• On-board 330 pF||2.5K dummy load per channel
• Built-in RX damping circuit
• Built-in 200 MHz LVDS SPI clock
• Built-in LVDS TX clock, selectable from 80, 120, 160 or 200 MHz (non-PLL)
• Built-in LVDS TX clock, selectable from 30, 40, 60 or 80 MHz (PLL mode)
• Daisy-chain capable
• User-controllable per-channel beamforming delay and apodization
• Evaluates the RX echo signals with an on-board LNA emulator
• Demonstrates B mode and CW mode waveform control
• On-board SPI EEPROM for the ultrasound demonstration board ID
• Test points for convenient measurement
• On-board 5V and 3.3V voltage supplies available for user

评估板HV7358DB1主要技术指标:


图5.评估板HV7358DB1框图



图6.评估板HV7358DB1电路图(1)

图7.MUPB002电路图(1):顶层框图

图8.MUPB002电路图(2):演示板连接器

图9.MUPB002电路图(3):FPGA

图10.MUPB002电路图(4):FPGA配置SPI闪存

图11.MUPB002电路图(5):可编时钟

图12.MUPB002电路图(6):FPGA去耦电容

图13.评估板HV7358DB1 PCB设计图(1):顶层丝印

图14.评估板HV7358DB1 PCB设计图(2):顶层铜和丝印

图15.评估板HV7358DB1 PCB设计图(3):顶层铜

图16.评估板HV7358DB1 PCB设计图(4):底层铜

图17.评估板HV7358DB1 PCB设计图(5):底层铜和丝印

图18.评估板HV7358DB1 PCB设计图(6):底层丝印

图19.MUPB002 PCB设计图(1):顶层丝印


图20.MUPB002 PCB设计图(2):顶层铜和丝印

图21.MUPB002 PCB设计图(3):顶层铜


图22.MUPB002 PCB设计图(4):底层铜

图23.MUPB002 PCB设计图(5):底层铜和丝印

图24.MUPB002 PCB设计图(6):底层丝印
评估板HV7358DB1材料清单:


MUPB002材料清单:




详情请见:
http://ww1.microchip.com/downloads/en/DeviceDoc/HV7358-Data-Sheet-DS20005918A.pdf
http://ww1.microchip.com/downloads/en/DeviceDoc/HV7358DB1-Users-Guide-DS50002951A.pdf
HV7358-Data-Sheet-DS20005918A.pdf
HV7358DB1-Users-Guide-DS50002951A.pdf

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