Microchip HV7358 16路3级高压(HV)超声波发送方案

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 mult...