5 Description (continued)

TX7516 (referred as device in this data sheet) is highly integrated transmitter solution targeted for exciting

ultrasound transducers. Device integrates 16 pulsers and 16 T/R switches, on-chip beamformer, and pattern

generator.

Pulser circuit generates five-level high voltage pulses (up to ±100 V) with maximum output current of 2A. When

pulser transmits the high voltage pulses, T/R switch turns OFF and protects the low voltage receiver circuit from

damage. 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 controlled by on-chip beamforming engine in the device.

The T/R switch offers 8-Ω impedance in the ON state.

Ultrasound transmission relies on excitation of multiple transducer elements, with different delay values defining

the direction of the transmission. Such an operation is referred to as transmit beamforming. TX7516 supports

staggered pulsing of the different channels, allowing for transmit beamforming.

In the on-chip beamformer mode, delay profile for pulsing of 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 214 beamformer clock periods. An internal pattern generator generates the output pulse patterns based on

pattern profiles stored in a profile RAM. Each channel has its own RAM, which is 960 words long. The patterns

have global and local repeats feature. This capability can be used to generate long patterns and can be used in

Shear-Wave imaging.

These pattern profiles and delay profiles are written using a high speed (400 MHz) serial peripheral interface.

The high-speed writes could be prone to errors. Hence, the device has a checksum feature to detect errors in

SPI writes.

To protect the device from getting damaged because of improper configuration, an internal error flag register can

detect faulty condition and configure the device in shutdown mode automatically.

The device integrates all the decoupling capacitors required for the floating supplies and internal bias voltages.

This significantly reduces the required number of external capacitors. TX7516 is available in a 10-mm × 10-mm

144-pin FC-BGA package (ALH package) and is specified for operation from 0°C to 70°C.

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TX7516

SLOSE40A – JUNE 2021 – REVISED MARCH 2022

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