STSTEVAL-IME003V1 Medical Ultrasound Image Solution

/a>Ultrasonic image” title=”Ultrasonic image”>Ultrasonic image” title=”Ultrasonic image”>Ultrasonic image demonstration board, the output waveform can be directly displayed on the oscilloscope by connecting the oscilloscope probe to the BNC. 16 preset waveforms It can be used to test high-voltage (HV) pulse generators under changing conditions. The STHV748 is a ±90 V 2 A high-speed pulse generator with an operating frequency of up to 20MHz, mainly used for medical ultrasound images, pulse generators, and NDT ultrasound transmission. and piezoelectric sensor driver. This article introduces the main features of STHV748, typical application circuit and STEVAL-IME003V1 main features, block diagram, circuit diagram, bill of materials and PCB component layout.

The STEVAL-IME003V1 demonstration board is designed around the STHV748 4-channel high voltage pulser, a state-of-the-art device designed for ultrasound imaging applications.

The output waveforms can be displayed directly on an oscilloscope by connecting the scope probe to the relative BNCs. 16 preset waveforms are available to test the HV pulser under varying conditions.

STHV748 is 5-level, ±90 V, 2 A high speed pulser with four independent channels. This monolithic, high-voltage, high-speed pulser generator features four independent channels. It is designed for medical ultrasound imaging applications, but it can also be used for driving other piezoelectric, capacitive or MEMS based transducers. The STHV748 comprises 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, clamping-to-ground circuitry, anti-leakage, anti-memory effect block, thermal sensor, and a T/R switch which guarantees an effective decoupling during the transmission phase. Moreover, the STHV748 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 w ave mode, a dedicated half bridge is available and the peak current is limited to 0.6 A.

STHV748 main features:

0 to ±90 V output voltage

Up to 20 MHz operating frequency

Embedded low-power, floating high-voltage drivers (external voltage rails can be also used)

Mode operations:

3/5-levels output waveform

±2 A source and sink current

Down ≤ 20 ps jitter

Anti-cross conduction function

Low 2nd harmonic distortion

Fully integrated clamping-to-ground function

8 Ω synchronous active clamp

Anti-leakage on output node

Dedicated half bridge for continuous wave (CW) operations

≤ 0.1 W power consumption

±0.6A source and sink current

≤ 10ps jitter

Fully integrated T/R switch

13.5 Ω on resistance

HV MOS topology to minimize current consumption

Up to 300 MHz BW

Receiver multiplexing function

2.4V to 3.6V CMOS logic interface

Auxiliary integrated circuits

Noise blocking diodes

Fully self-biasing architecture

Anti-memory effect for all internal HV nodes

Thermal protection

Standby function

Latch-up free due to HV SOI technology

Very few external passive components needed

STHV748 application:

■ Medical ultrasound imaging

■ Pulse waveform generator

■ NDT ultrasound transmission

■ Piezoelectric transducers driver
STSTEVAL-IME003V1 Medical Ultrasound Image Solution
Figure 1. STHV748 Typical Application Circuit
STSTEVAL-IME003V1 Medical Ultrasound Image Solution
Figure 2. STEVAL-IME003V1 Ultrasonic Image Demo Board Outline Drawing

STEVAL-IME003V1 main features:

● Based on the STHV748 device for ultrasound imagine applications

● 4 monolithic channels, 5 level high voltage pulser

● Integrated T/R switch

● On-board equivalent piezoelectric load implemented by means of:

– R/C equivalent network

– SMD landing areas available for a customized output load

● USB interface available to upload customized output waveforms

● 4 Mb serial Flash memory available for storing customized waveforms

● Memory expansion connector is available to expand serial Flash size

● High voltage and low voltage connectors to power the STHV748

● 25 LEDs to check the board status and proper operation

● Human machine interface to select, start and stop the stored output waveforms
STSTEVAL-IME003V1 Medical Ultrasound Image Solution
Figure 3. Block diagram of the STEVAL-IME003V1 Ultrasound Image Demo Board
STSTEVAL-IME003V1 Medical Ultrasound Image Solution
Figure 4. STEVAL-IME003V1 Ultrasonic Image Demo Board Circuit Diagram (1)
STSTEVAL-IME003V1 Medical Ultrasound Image Solution
Figure 5. STEVAL-IME003V1 Ultrasound Image Demo Board Circuit Diagram (2)
STSTEVAL-IME003V1 Medical Ultrasound Image Solution
Figure 6. STEVAL-IME003V1 Ultrasound Image Demo Board Circuit Diagram (3)
STSTEVAL-IME003V1 Medical Ultrasound Image Solution
Figure 7. STEVAL-IME003V1 Ultrasound Image Demo Board Circuit Diagram (4)
STSTEVAL-IME003V1 Medical Ultrasound Image Solution
Figure 8. STEVAL-IME003V1 Ultrasound Image Demo Board Circuit Diagram (5)
STSTEVAL-IME003V1 Medical Ultrasound Image Solution
Figure 9. STEVAL-IME003V1 Ultrasound Image Demo Board Circuit Diagram (6)
STSTEVAL-IME003V1 Medical Ultrasound Image Solution
Figure 10. STEVAL-IME003V1 Ultrasound Image Demo Board Circuit Diagram (7)
STSTEVAL-IME003V1 Medical Ultrasound Image Solution
Figure 11. STEVAL-IME003V1 Ultrasound Image Demo Board Circuit Diagram (8)
STSTEVAL-IME003V1 Medical Ultrasound Image Solution
Figure 12. STEVAL-IME003V1 Ultrasound Image Demonstration Board Circuit Diagram (9)

STEVAL-IME003V1 Ultrasound Image Demo Board Bill of Materials (BOM):
STSTEVAL-IME003V1 Medical Ultrasound Image Solution
STSTEVAL-IME003V1 Medical Ultrasound Image Solution
STSTEVAL-IME003V1 Medical Ultrasound Image Solution
STSTEVAL-IME003V1 Medical Ultrasound Image Solution
STSTEVAL-IME003V1 Medical Ultrasound Image Solution
STSTEVAL-IME003V1 Medical Ultrasound Image Solution
Figure 13. STEVAL-IME003V1 Board Component Layout (Top Layer)

For details, see:
http://www.st.com/internet/com/TECHNICAL_RESOURCES/TECHNICAL_LITERATURE/DATA_BRIEF/DM00036082.pdf
and
http://www.st.com/internet/com/TECHNICAL_RESOURCES/TECHNICAL_LITERATURE/APPLICATION_NOTE/DM00035397.pdf
as well as
http://www.st.com/internet/com/TECHNICAL_RESOURCES/TECHNICAL_DIAGRAM/SCHEMATICPACK/steval-ime003v1_schematic.pdf

The Links:   LJ512U25A SMA6511

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