h1_key

说明

HV7358是一款内置可编程波束形成器的16通道3电平高压超声发射器。每个通道都可以通过T/R开关和有源放电回0V电路产生高达±80V的脉冲。输出电流可编程为0.3A、0.5A、1.0A和1.6A。 
集成发射波束形成器为波束形成延迟提供了高达5ns的分辨率。波束形成器的延迟时钟由内置的低相位噪声PLL产生。HV7358最多可存储4组传输模式，每个模式最多可存储256个脉冲。或者，该装置还允许对每个单独通道的PWM占空比进行编程。
波束形成器具有8比特除以N计数器，用于从输入时钟生成CW频率以支持连续波多普勒操作。一旦CW频率和信道延迟被编程，当触发信号被断言时，CW传输开始。
差分线上的200MHz SPI为波束形成器和模式生成器提供编程接口。其余参数通过I2C编程。内置波束形成器和菊花链可快速SPI接口大大减少了FPGA所需的连接数量。
HV7358的丰富功能使其特别适用于便携式/超便携式超声成像设备。

有关数据表、演示板和更多信息，请联系当地Microchip销售办事处。

特性

• 16 channel with active return to true-zero
• Up to ±80V output voltage & ±1.6A output current
• Programmable output current: 0.3, 0.6, 1.2 & 1.6A
• Output ultrasound frequency up to 30MHz
• -40dB Second Harmonic at 5MHz, ±70V, 5-Cycle
• Built-in T/R switch, damper diodes
• Built-in linear regulators for floating gate driver
• Internal low jitter PLL clock multiplier for Tx beamformer and Tx clock
• 30 to 80MHz LVDS input-clock frequencies in PLL mode.
• 30 to 240MHz LVDS input-clock frequencies in non-PLL mode
• PLL frequency integer multiplier 1, 2, 3, 4, 5, 6 & 8.
• Build-in transmit beamformer that allows 5ns delay resolution.
• Guarantee synchronize internal transmit clock across devices to be in same phase
• PLL circuit can be bypassed and shut down to reduce the power consumption
• Store up to four Tx patterns with the optional local tOFF counter allows for Tx apodization use PWM
• Tx patterns up to 256 pulses with programmable pulse width and frequency
• High speed LVDS SPI typ 200MHz operation allows for fast device programming
• SPI group broadcast mode for fast data writing,
• Two-Wire I2C Interface for control and status reading
• Package: 13mmx13mm TFBGA with 0.8mm pitch

参数