TSA1203IFT-E View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'TSA1203IFT-E' PDF : 30 Pages View PDF
Practical application examples
9
Practical application examples
TSA1203
9.1
Digital interface applications
The wide external buffer power supply range of the TSA1203 makes it a perfect choice for
plugging into 2.5 V or 3.3 V low voltage DSPs or digital interfaces.
9.2
Medical imaging applications
Driven by the increasing demand for applications requiring either portability or a high degree
of parallelism (or both), this product satisfies the requirements of medical imaging and
telecom infrastructures.
The typical system diagram in Figure 32, shows how a narrow input beam of acoustic
energy is sent into a living body via the transducer, and how the energy reflected back is
analyzed.
Figure 32. Medical imaging application
HV TX amps
TX beam
former
Mux and
T/R
switches
ADC
TGC amplifier
RX beam
former
24/30
Processing
and display
The transducer is a piezoelectric ceramic such as zirconium titanate. The whole array can
reach up to 512 channels. The TX beam former, amplified by the HV TX amps, delivers up to
100 V amplitude excitation pulses with phase and amplitude shifts. The mux and T/R switch
is a two way input signal transmitter/ output receiver.
To compensate for skin and tissues attenuation effects, the time gain compensation (TGC)
amplifier is an exponential amplifier that amplifies low voltage signals to the ADC input
range. A differential output structure with low noise and very high linearity are essential
factors.
These applications need high speed, low power and high performance ADCs. 10-12 bit
resolution is necessary to lower the quantification noise. As multiple channels are used, a
dual converter is a must for room saving issues.
The input signal is in the range of 2 to 20 MHz (mainly 2 to 7 MHz) and the application uses
mostly a 4 over-sampling ratio for spurious free dynamic range (SFDR) optimization.
The next RX beam former and processing blocks enable the analysis of the output channels
versus the input beam.
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