1 Features

• Transmitter supports:

– 64-channel 3-level pulser and active transmit/

receive (T/R) switch

• 3-level pulser:

– Maximum output voltage: ±100V

– Minimum output voltage: ±1V

– Maximum output current: 1A

– True return to zero to discharge output to

ground

– Second harmonic of –40dBc at 5MHz

– –3-dB Bandwidth with 400Ω || 125pF load

• 22MHz for a ±100-V supply

– Very low receive power: 2.8mW/ch

• Active transmit/receive (T/R) switch with:

– Turn on resistance of 22Ω

– Turn on and Turn off time: 100ns

– 2:1 Channel Muxing to LNA input

• LNA

– Supports a maximum input swing of 500mVpp

– Gain of 24dB

– HD2 of -55 dBc and HD3 of 40dBc at 5MHz

– Programmable input impedance to match

source impedance 100, 200. 400 and 800Ω

with DTGC support

• On-chip beam former with:

– Channel based T/R switch on and off controls

– Delay resolution: half beamformer clock period,

minimum 2.5ns

– Maximum delay: 214 beamformer clock period

– Maximum beamformer clockspeed: 200MHz

– On-Chip RAM for pattern and delay profile

– One 512 × 32 memory to store beam-former

pattern and delay for a group of 4 channels

– Global repeat feature present, enabling long

duration patterns

• High-speed (400MHz maximum), 2-lane LVDS

serial programming interface.

– Low programming time: ≈1μs for delay profile

update

– 32-bit Checksum to detect wrong SPI writes

• Supports CMOS serial programming interface

(50MHz maximum)

• High reliability features:

– Internal temperature sensor and automatic

thermal shutdown

– No specific power sequencing requirement

– Error flag register to detect faulty conditions

– Integrated passives for the floating supplies and

bias voltages

– Small package: FC-BGA-196 (12mm × 12mm)

with 0.8mm pitch

2 Applications

• Ultrasound imaging system

• Piezoelectric driver

• In-probe ultrasound imaging

3 Description

TX73L64 is a highly integrated, high-performance

transmitter device for ultrasound imaging system. The

device has total 64 pulser circuits, 64 transmit/ receive

switches (referred as T/R or TR switches), 32 LNA

circuits, and supports on-chip beamformer (TxBF).

The T/R switches also perform a 2:1 multiplexing

operation to multiplex inputs of 2 channels to 1 LNA.

The device also integrates on-chip floating power

supplies that reduce the number of required high

voltage power supplies.

TX73L64 has a pulser circuit that generates threelevel

high voltage pulses (up to ±100 V) that is used to

excite multiple channels of an ultrasound transducer.

The device supports total 64 outputs. The maximum

output current is 1A.

Device can be used as a transmitter device for many

applications like ultrasound imaging, non-destructive

testing, SONAR, LIDAR, marine navigation system,

brain imaging systems and so on.