STHV748 Datasheet, PDF (1/22 Pages) STMicroelectronics – 5-level, ±90 V, 2 A high-speed pulser with four independent channels

STHV748
5-level, ±90 V, 2 A high-speed pulser
with four independent channels
Preliminary data
Features
■ High-density ultrasound transmitter
■ 0 to ±90 V output voltage
■ Up to 20 MHz operating frequency
■ Low-power, high-voltage drivers
■ 2 independently supplied half bridges for each
channel in pulse wave (PW) mode
– 5-level output waveform
– ±2 A source and sink current
– Down to 20 ps jitter
– Anti-cross conduction function
– Low 2nd harmonic distortion
– Fine-tuning on propagation delay
■ Fully integrated clamping-to-ground function
– 6 Ω synchronous active clamp
– Anti-leakage on output node
■ Dedicated half bridge for continuous wave
(CW) mode on each
– Down to 0.1 W power consumption
– ±0.6 A source and sink current
– Down to 10 ps jitter
■ Fully integrated HV receiver switch
– 13.5 Ω on resistance
– HV MOS topology to minimize current
consumption
– Up to 300 MHz BW
■ 2.4 V to 3.6 V CMOS logic interface
■ Auxiliary integrated circuits
– Noise blocking diodes
– Fully self-biaising architecture
– Anti-memory effect for all internal HV
nodes
– Thermal protection
– Stand by function
■ Latch-up free due to HV SOI technology
■ Very few external passive components needed
QFN64 9 x 9 x1.0 mm
Applications
■ Medical ultrasound imaging
■ Pulse waveform generator
■ NDT ultrasound transmission
■ Piezoelectric transducers driver
Description
This monolithic, high-voltage, high-speed pulser
generator features four independent channels. It
is designed for medical ultrasound applications,
but can also be used for other piezoelectric,
capacitive or MEMS transducers. The device
comprises a controller logic interface circuit, level
translators, MOSFET gate drivers, noise blocking
diodes and high-power P-channel and N-channel
MOSFETs as output stage for each channel,
clamping-to-ground circuitry, anti-leakage, anti-
memory effect block, thermal sensor and HV
receiver switch (HVR_SW) which guarantees a
strong decoupling during transmission phase.
Moreover the STHV748 includes self biasing and
thermal shutdown blocks (see Figure 1).
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, the peak current is
limited to 0.6 A (a dedicated half bridge is used).
Table 1. Device summary
Order code
Package
STHV748QTR
QFN64
Packaging
Tape and reel
January 2010
Doc ID 15450 Rev 1
This is preliminary information on a new product now in development or undergoing evaluation. Details are subject to
change without notice.
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