Microchip MD2131 | Demoboard MD2131DB2

Description

This MD2131DB2 datasheet describes how the demoboard is to used to generate the ultrasound transmit beamforming waveform with the Gaussian profile, and the adjustable frequency, amplitude and phase angle. It also provides information about how to design a user application circuit and PCB using the Supertex MD2131 and DN2625 devices. The MD2131DB2 circuit uses two depletion-mode MOSFETs in the push-pull mode to drive the center tapped, coupled, RF power inductor. The two depletion-mode MOSFETs are packaged in a single 5x5mm DFN package. The sources of the MOSFETs are directly driven by the MD2131’s two outputs, whose maximum peak sinking current is up to 3.0A. These current source outputs are controlled by the MD2131’s internal angular vector switch matrix and the inphase and quadrature PWM input signals. All of the MD2131’s logic control signals are generated by two small CPLD programmable logic circuits clocked by an on-board 160MHz crystal oscillator. The CPLD circuits not only generate accurate timing for the high speed PWM control waveforms, but also the serial data and clock to set and change the waveform amplitude DAC and phase angle data registers.

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