STMicroelectronics STHV748 Ultrasound Pulse Controller

STMicroelectronics announced the STHV748, which is a highly integrated low-noise ultrasound pulse controller. The STHV748 includes four independent channels, each of which generates precisely controlled high-voltage pulses to drive piezoelectric crystals or other transducers. The device is housed in a lead-free QFN64 9.0 x 9.0 x 1.0mm package. The STHV748 is available now at $11.95 in quantities of 10,000. The device is ideal for ultrasound imaging systems in a small form factor.

STMicroelectronics STHV748 Ultrasound Pulse Controller

STMicroelectronics STHV748 Ultrasound Pulse Controller Features

  • +/- 90V dual independent high-voltage supplies
  • +/- 2A source and sink current in pulse mode and Continuous Wave mode (CW)
  • A dedicated CW mode pulser for low power and ultra low jitter (down to 20ps)
  • Up to 20MHz frequency
  • Fully integrated clamp to ground
  • Noise block diodes
  • Anti-Memory circuitry to improve beam forming accuracy
  • Thermal protection and standby mode
  • 4 independent Transmission to Receive Switches (TR_sw), very low noise figure, low on-resistance and up to 300MHz bandwidth
  • Possibility to operate in 5 level pulse mode
  • Greater than 42dB second-harmonic suppression

The STHV748 integrates CMOS digital control logic, analog level translators, MOSFET gate drivers and high-power N- and P-channel MOSFET output stages in a fully self-biasing architecture.

The ultrasound scanner works on the same principles as radar. A piezoelectric transducer emits a burst of ultrasound waves when stimulated by a high-voltage electrical signal and, in turn, generates a low-voltage electrical signal in response to the echoed reflections of ultrasound waves from, for example, soft body tissues. The role of the STHV748 is to provide the accurately timed high-voltage pulses that generate the ultrasound burst and switch to receive mode to detect the echoed signals.

More information: STMicroelectronics