HV758DB1

Features:






Specifications






Description

      This is the introduction HV758DB1: The HV758 is a monolithic 4-channel, high-speed, high voltage, ultrasound transmitter pulser. This integrated, high performance circuit is in a single, 8x8mm, 64-Ball FCBGA package. The HV758 can deliver up to a ±2.2A source and sink current to a capacitive transducer. HV758DB1 is designed for medical ultrasound imaging and ultrasound material NDT applications. It can also be used as a high voltage driver for other piezoelectric or capacitive MEMS transducers, or for ATE systems and pulse signal generators as a signal source.  HV758DB1's circuitry consists of controller logic circuits, level translators, gate driving buffers and a high current and high voltage MOSFET output stage. The output stages of each channel are designed to provide peak output currents over ±2.5A for pulsing, when MC0 = 1 and MC1 = 1, with up to ±90V swings. When in mode 1, all the output stages drop the peak current to ±580mA for low-voltage CW mode operation to save power. Two fl oating 9VDC power supplies referenced to VPP and VNN supply the P- and N-type power FET gate drivers. The upper limit frequency of the pulser waveform is 20MHz depending on the load capacitance. One HV758 can also be used as four damping circuits to generate fast return-to-zero waveforms by working with another HV758 as four pulsing circuits. HV758DB1 also has built-in, under-voltage and over-temperature protection functions.
      This is the designing a Pulser with HV758: This demo board data sheet describes how to use the HV758DB1 to generate the basic high voltage pulse waveform as an ultrasound transmitting pulser. The HV758 circuit uses the DC coupling method in all level translators. There are no external coupling capacitors needed. The VPP and VNN rail voltages can be changed rather quickly, compared to a high voltage capacitor gate coupled driving pulser. This direct coupling topology of the gate drivers not only saves two high voltage capacitors per channel, but also makes the PCB layout easier. The input stage of the HV758DB1 has high-speed level translators that are able to operate with logic signals of 1.2V to 5.0V and are optimized at 2.5V to 3.3V. In this demo board, the control logic signals are connected to a high-speed ribbon cable connector. The control signal logic-high voltage should be the same as the VCC voltage of the demo board, and the logic-low should be referenced to GND.
      The HV758DB1 output waveforms can be displayed using an oscilloscope directly by connecting the scope probe to the test point TX1 to 4 and GND. The soldering jumper can select whether or not to connect the on-board equivalentload, a 330pF, 200V capacitor, parallel with a 2.5k, 1W resistor. Also, a coaxial cable can be used to connect the user's transducer to easily drive and evaluate the HV758 transmitter pulser.