Microchip Technology

The HV7321 is a 4-channel, 5-level, ultrasound transmitter with built-in T/R switches, output protection diodes and clamp diodes. The HV7321 can provide up to ±2.5A and the output voltage swing can be up to ±80V. The HV7321 supports both Transparent and Re-Timing mode. The re-timing clock frequency can support up to 220 MHz. The re-timing feature helps reduce the output jitter introduced by a driving field-programmable gate array (FPGA). The HV7321 has two different modes for CW transmission, CW-Mode 0 and CW-Mode 1. In CW-Mode 0 (Mode = 0, PWS = 0), the VPP1 and VNN1 rails are used for CW transmission. The output current is reduced in CW Mode-0. In CW-Mode 1, the HV7321 accepts the output of an external CW beamformer as the CW source. The HV7321 is LVCMOS 2.5V/3.3V input compatible, which can interface directly with an FPGA. The HV7321 is available in a 9 mm x 9 mm 64-Lead VQFN package.

The HV7322 is an 8-channel, true 5-Level or pseudo 7-Level, high voltage pulser with integrated dual T/R switches. It is designed for medical ultrasound or nondestructive testing (NDT) applications. The device has seven output levels: VPP0, 1, 2, VNN0, 1, 2 and GND. The output transistors can provide up to ±2A of current at ±80V maximum. HV7322 has the 220 MHz differential retiming clock which realigns the logic input signals to a master clock. This feature reduces delay variations caused by FPGA inaccuracies and/or long PCB traces. The built-in gate driver regulators allow interdependent VPP0, 1, 2 and VNN0, 1, 2 HV rails and freely move the voltage from 0 to ± 80V. The logic control voltages are designed to work with LVDS or LVCMOS logic families. For further information, please contact [Microchip sales office](https://www.microchip.com/en-us/about/global-sales-and-distribution).

HV7351 is an eight channel monolithic high-voltage ultrasound transmitter with built-in programmable digital transmit-beamforming. Each channel is capable of operating the outputs up to +/-70V with an active discharge back to 0V. The outputs can source and sink up to 3.0A to achieve fast output rise and fall times. The active discharge is also capable of sourcing and sinking 3.0A for a fast return to ground. HV7351 is the industry's first integrated ultrasound transmitter with built-in programmable digital transmit-beamforming. Each transmitter has four associated 64-bit shift registers for storing pre-determined transmit patterns and a 10-bit delay counter for controlling the transmit timing. Each of the four arbitrary patterns can be transmitted with adjustable delay, depending on the data loaded into these shift registers and the delay counter. The delay counter can be clocked up to 200Mhz, allowing incremental delays down to 5 ns resolution. The transmit patterns and the delay counters can be programmed through the daisy-chainable SPI interface. The SPI interface can work up to 80Mhz, allowing fast device programming in order to allow high image frame rates. The built-in beamformer topology and the daisy-chainable fast SPI interface greatly reduces the FPGA I/O count requirement. Thus, the FPGAs those are normally dedicated for transmitter control are now no longer required. The built-in beamformer also supports CW operation. The beamformer has a 6-bit divide by N counter to divide the input clock to generate the CW frequency. Once the CW frequency and the channel delays are programmed, the CW transmission starts when the TRIG signal is asserted. With the exception of the input clock, all digital signals are idle during the CW transmission. The "set-and-go" mechanism of the CW beamformer eliminates harmful digital cross-talk noise on the PCB from FPGAs. HV7351 is ideal for demanding space-constrained applications such as portable medical ultrasound systems and wireless ultrasound probe systems.

HV7355 is an eight-channel, unipolar, high voltage, high-speed pulse generator. It is designed for medical ultrasound applications. This high voltage and high speed integrated circuit can also be used for other piezoelectric, capacitive or MEMS sensors in ultrasonic nondestructive detection and sonar ranger applications. The HV7355 consists of a controller logic interface circuit, level translators, MOSFET gate drivers and high current P-channel and N-channel MOSFETs as the output stage for each channel. The output stages of each channel are designed to provide peak output currents over ±1.5A for pulsing, when MC = 1, with up to 150V swings. When MC = 0, all the output stages drop the peak current to ±500mA for low-voltage CW mode operation to save power. This direct coupling topology of the gate driver not only saves one high voltage capacitor per channel, but also makes the PCB layout easier.

HV7361 is a high voltage, high-speed, pulse generator with built-in, fast return to zero damping FETs, and an integrated, two terminal, low noise T/R switch. This high voltage and high-speed integrated circuit is designed for portable medical ultrasound image devices, but can also can be used for NDT and test equipment applications. The HV7361 consists of a controller logic interface circuit, level translators, AC coupled MOSFET gate drivers and high voltage and high current P-channel and N-channel MOSFETs as the output stage. The peak output currents of each channel are guaranteed to be over ±2.5A with up to ±100V of pulse swing. The AC coupling topology for the gate drivers not only saves two floating voltage supplies, it also makes the PCB layout easier.

The HV7620 is a low-voltage serial to high-voltage parallel converter with push-pull outputs. This device has been designed for use as a driver for color AC plasma displays. The device has 4 parallel 8-bit shift registers permitting data rates four times the speed of one. The data is clocked in simultaneously on all four data inputs with a single clock. Data is shifted in on a low to high transition of the clock. The latches and control logic perform the output enable function. The DIR pin causes clockwise (CW) shifting of the data when connected to VDD1, and counterclockwise (CCW) shifting when connected to LVGND. Operation of the shift register is not affected by the LE (latch enable) input. Transfer of data from the shift registers to the latches occurs when the LE input is high. Data is stored in the latches when LE is low. The current source on the logic inputs provides active pull up when the input pins are open.