Description

STHV748S

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DocID030128 Rev 1

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Description

This monolithic, high-voltage, high-speed pulser generator features four independent

channels. It is designed for medical ultrasound imaging applications, but can also be used

to drive piezoelectric, capacitive or MEMS based transducers.

The STHV748S is composed of a controller logic interface circuit, level translators,

MOSFET gate drivers, noise blocking diodes, and high-power P-channel and N-channel

MOSFETs as the output stage for each channel. It also includes clamping-to-ground

circuitry, anti-leakage, anti-memory effect block, thermal sensor, and a T/R switch which

guarantees effective decoupling during the transmission phase. The STHV748S also

includes self-biasing and thermal shutdown blocks.

Each channel can support up to five active output levels with two half bridges. The output

stage of each channel is able to provide ±2 A peak output current. In order to reduce power

dissipation during continuous wave mode, a dedicated half-bridge is available and the peak

current is limited to 0.6 A.

An ESD reinforced structure was developed to prevent high voltage overshoots and inrush

current due to cabled transducer reflections. Each HV output is supported by a dedicate HV

diode network to withstand possible reflections, mitigating excessive voltage overshoot that

could lead to device damage.