1 Introduction of TX7364 and Key Specifications

TX7364 is a highly integrated, high-performance transmitter device for ultrasound imaging system. The device has total 64 pulser circuits, 64 transmit/ receive switches (referred to as T/R or TR switches) and supports on-chip beamformer (TxBF). The device also integrates the passives inside the package, reducing the number of external decaps that have to be placed on the board. Each pulser circuits of TX7364 is capable of generating a 3-level waveform, supporting a maximum peak voltage of ±100V, with a maximum current drive of 1A. The following are some of the key specifications of TX7364.

• The device offers a second harmonic performance of 40dBc at 5MHz.
• The device offers a 3dB bandwidth of 22MHz for a 400Ω || 125pF load.
• The ON resistance of T/R Switch is about 26Ω, while the receiver power of the device is 0.1mW/ch.
• Maximum beamformer clock supported is 200MHz.
• Beamforming delay resolution is half beamformer clock period, that is, 2.5ns.
• The device offers a 512x32 on-chip RAM to store pattern and delay information for a group of four channels. 16 such RAMs are present to store the information for the entire 64 channels.