Octal ±90 V, ±2 A, 3-level RTZ, high-speed ultrasound pulser

The STHV800 is an octal, monolithic, high-voltage and high-speed pulse generator. It is designed for medical ultrasound applications, but can be used for other piezoelectric, capacitive or MEMS transducers.

The device integrates a controller logic interface circuit (compatible with both 1.8 V and 3.3 V input signals), level translators, MOSFET gate drivers, noise blocking diodes, and high power P-channel and N-channel MOSFETs as the output stage for each channel. These MOSFETs are capable of providing more than 2 A of peak output current. Each channel has a dedicated bridge in order to reduce power dissipation and jitter during continuous wave mode (peak current is limited to 0.3 A). This CW bridge has dedicated power supplies (HV_CW) which are fully independent on the main HV supplies.

These HV_CW supplies can be shorted to the HV supplies. The fundamental structure of each channel also consists of active clamping to ground circuitry, anti-leakage and anti-memory block, a thermal sensor to protect the device and an integrated TR-switch (just 8 Ω as equivalent resistor ) to connect the HV output to its LV output, guaranteeing strong decoupling during the transmission phase.

The eight independent T/R switches can be used in both a dedicated RX chain per channel or in a multiplexing configuration.

The clamp circuit has a current capability up to 2 A and works directly on the output pin, carrying this node exactly to zero. This feature allows minimized injection change during the transition from clamp to RX state.

In addition, the STHV800 includes self-biasing circuitry which allows very low power consumption during the RX phase (down to 200 µW global power dissipation) and thermal shutdown block sensing by an external dedicated pin (THSD).

One of the main benefits of this device is that it requires very few external components: only decoupling capacitors on the HV and LV supplies, and a resistor to pull up the THSD pin (moreover, this resistor can be shared by many devices).

Each channel is driven independently by only 2 digital bits, which in CW mode become one bit. An external clock can be used with the STHV800 to synchronize all the input signals. This feature, however, is optional: if the CK pin is tied to ground the device works in asynchronous mode.

Key Features

  • High-density ultrasound transmitter
  • Two independent half-bridges per channel
  • 0 to ±90 V output voltage
  • Power-up free
  • Synchronization of the input signals (selectable) by an external clock
  • Up to 20 MHz operating frequency
  • Low-power, high-voltage, high-speed drivers
  • 2 independently-supplied half bridges (shorted-option) for each channel, one dedicated to continuous wave (CW) mode
    • Main half bridge: ±2 A source and sink currentDown to 20 ps jitterLow 2nd harmonic distortion
    • CW half bridge:±0.3 A source and sink currentDown to 10 ps jitterVery low power consumption
  • Fully integrated real clamping-to-ground function
    • 8 Ω synchronous active clamp
    • ±2 A source and sink current
  • Fully integrated TR switch
    • 8 Ω ON resistance
    • Up to 300 MHz BW
    • Current consumption down to 10 μA in RX phase
    • Receiver multiplexing function
  • 1.8 V to 3.6 V CMOS logic interface
  • Auxiliary integrated circuits
    • Noise blocking diodes
    • Anti-leakage on output node
    • Fully self-biasing architecture
    • Thermal protection
  • Latch-up free due to HV SOI technology
  • Very few external passive components or supplies needed

デザイン

技術文書

製品スペック
Description バージョン サイズ
DB2236 DB2236: Octal ±90 V, ±2 A, 3-level RTZ, high-speed ultrasound pulser 2.0 554 KB
アプリケーションノート
Description バージョン サイズ
AN4471 AN4471: STEVAL-IME009V1 evaluation board based on the STHV800 high voltage pulser 1.1 1 MB

Publications and Collaterals

フライヤー
Description バージョン サイズ
Octal ultrasound pulser High-voltage, high-speed STHV800 276 KB
パンフレット
Description バージョン サイズ
Semiconductor solutions for healthcare applications 1.0 665 KB

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サンプル & 購入

製品型番 パッケージ Packing Type Operating Temperature (°C) (min) Operating Temperature (°C) (max) Marketing Status Unit Price (US$) * 数量 ECCN (EU) ECCN (US) Country of Origin More info Order from ST Order from Distributors
STHV800L TFLGA-56LD 8x8x0.9mm Tray -40 125 Active 16 1000 NEC EAR99 FRANCE MORE INFO DISTRIBUTOR AVAILABILITY
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(*) Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office  or our Distributors

品質 & 信頼性

製品型番 Marketing Status パッケージ Grade RoHS Compliance Grade Material Declaration**
STHV800L アクティブTFLGA-56LD 8x8x0.9mmIndustrialEcopack2 0 0
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(**) The Material Declaration forms available on st.com may be generic documents based on the most commonly used package within a package family. For this reason, they may not be 100% accurate for a specific device. Please contact our sales support for information on specific devices.

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