The MD2131 is a high-speed, arbitrary waveform, push-pull source driver. It is designed for medical ultrasound imaging and HIFU beamforming applications. It also can be used in NDT, Sonar and other ultrasound phase-array focusing beamforming applications.The MD2131 consists of CMOS digital logic input circuits, an 8-bit current DAC for waveform amplitude control, and four PWM current-sources. These current sources are constructed with the high-speed, in-phase and quadrature current-switch matrix and the built-in sine and cosine angle-to-vector look-up table. The angular resolution of the vector table is 7.5O per step, with a total range of 48 steps. There are four logic input signals to control the in-phase and quadrature PWM push-pull current-source’s output timing, frequency, cycle in the burst and waveform envelope.The MD2131’s output stage is designed to drive two DN2625 depletion N-type MOSFETs. The MOSFET drains are connected to a center-tap ultrasound frequency pulse transformer. The secondary winding of the transformer can connect to the ultrasound piezo or capacitive transducer via a cable with a good impendence match. The MD2131 has a high-speed, SPI-compatible interface to achieve per-scan-line fast updating of the data register for changing the beamforming phase angles and apodization amplitudes.

  High resolution transmitting waveform

  Up to 3.0A push-pull source-driving current

  230VP-P maximum output, uses two DN2625 FETs

  Angle vector beamforming I-Q switcher matrix

  8-bit apodization DAC and 7.5° angular resolution

  Flexible frequency-resolution trade-off

  Programmable aperture windowing

  250MHz maximum sampling rate

  25MHz ultrasound maximum frequency

  PWM modulation push-pull current source

  Focusing phase adjustment & chirp waveform

  Fast SPI interface

  2.5V CMOS logic interface

  +5.0V single power supply

  Low second order harmonic distortions