The TX7332 is a highly integrated, high-performance transmitter solution for ultrasound
imaging system. The device has total 32 pulser circuits (PULS), 32 transmit/receive (T/R) switches,
and supports both on-chip and off-chip beamformer (TxBF). The device also integrates on-chip
floating power supplies that reduce the number of required high voltage power supplies.
The TX7332 has a pulser circuit that generates three-level high voltage pulses (up to
±100 V) that can be used to excite multiple channels of an ultrasound transducer. The device
supports total 32 outputs. The maximum output current is configurable from 1.2 A to 0.3 A.
A T/R switch under OFF state protects the receiver circuit by providing high isolation
between the high-voltage transmitter and the low-voltage receiver when the pulser is generating
high-voltage pulses. When the transducer is receiving echo signals, the T/R switch turns ON and
connects the transducer to the receiver. The ON/OFF operation of the T/R switch is either
controlled by an external pin or controlled by on-chip beamforming engine in the device. The T/R
switch offers 24-Ω impedance in the ON state.
Ultrasound transmission relies on the excitation of multiple transducer elements with the
delay profile of the excitation across the different elements defining the direction of the
transmission. Such an operation is referred to as transmit beamforming. The TX7332 supports
staggered pulsing of the different channels, allowing for transmit beamforming. The device supports
both off-chip and on-chip beamforming operation.
In the off-chip beamformer mode, the output transition of each pulser and TR switch
ON/OFF operation is controlled by external control pins. To eliminate the effect of jitter from the
external control signals, the device supports a synchronization feature. When the synchronization
feature is enabled, the external control signals are latched using a low-jitter beamformer clock
In the on-chip beamformer mode, the delay profile for the pulsing of the different
channels is stored within the device. The device supports a transmit beamformer delay resolution of
one beamformer clock period and a maximum delay of 213 beamformer clock
periods. An internal pattern generator generates the output pulse patterns based on pattern
profiles stored in a profile RAM. Up to 16 beamforming profiles and 32 pattern profiles can be
stored in the profile RAM. On-chip beamforming mode reduces the number of control signals that must
be routed from the FPGA to the device..
The TX7332 is available in a 17-mm × 11-mm 260-pin NFBGA package and is specified for
operation from 0°C to 70°C.