Ultrasound beamforming source driver

March 24, 2014 // By Julien Happich
Supertex‘ MD2133 is a programmable high-speed source-driver for pulsed current applications.

Aimed at medical ultrasound beam-forming applications, the part can also be used in High Intensity Focused Ultrasound (HIFU), Non-Destructive Testing (NDT) using ultrasound, Laser Diode Drive, and other instrumentation applications such as arbitrary waveform generation.

 

The MD2133 contains CMOS digital logic input circuits, an 8-bit current DAC for aperture weighting control, as well as an 8-bit fast pulse current switch matrix. The MD2133 supports both Pulse-Current Amplitude Modulation (PAM) and Pulse-Width Modulation (PWM) with an in-phase and quadrature I-Q current-switch, and a built-in sine and cosine angle-to-vector look-up table. The angular resolution of the vector table is 1.4°/step with a total range of 256 steps/360°.  The 8x1k bits waveform memory can pre-store data for up to four waveforms. 

 

The stored parameters for each include data length, start address, cycle limits or continuous looping mode, the transmit frequency pre-scale (N divisor), selection for polarity swapping (fast launch), chirp-up /down for FM and forward / reverse transmit (time-symmetrical waveforms for fewer data points).  Two SSTL differential clock inputs control all the waveform writing, read back, transmit delay, and frequencies.  The high-speed SPI bus enables fast data updates per-scan-line updating for dynamically changing delay times, as well as for weighting and waveform selection.

 

Get the datasheet or refer to attached product launch kit (zip file). 

 

Visit Supertex at www.supertex.com