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Texas Instruments TX7364 Analog Front End (AFE) Transmitter

Texas Instruments TX7364 Analog Front End (AFE) Transmitter is a highly integrated, high-performer transmitter that supports a 64-channel 3-level pulser and active Transmit/Receive (T/R) switch. This transmitter features a 400MHz high speed (maximum) and a 2-lane LVDS serial programming interface. The TX7364 transmitter supports a CMOS serial programming interface (50MHz maximum) and integrates on-chip floating power supplies that reduce the number of required high-voltage power supplies. This AFE transmitter includes an internal temperature sensor and an automatic thermal shutdown. This transmitter is ideal for ultrasound imaging systems, piezoelectric drivers, and in-probe ultrasound imaging.

The pulser circuit generates three-level high-voltage pulses (up to ±100V) to excite multiple ultrasound transducer channels. The active T/R switch features a 26Ω turn-on resistance, a 100ns turn-on and turn-off time, and a 10mVpp transient glitch. The on-chip beamformer includes a delay resolution of 2.5ns maximum half beamformer clock period and 200MHz maximum beamformer clocks peed. The TX7364 AFE transmitter comes in an FC-BGA-196 (12mm x 12mm) with a 0.8mm pitch small package.

Features

  • 64-channel 3-level pulser and active Transmit/Receive (T/R) switch
  • 3-level pulser:
    • ±100V maximum output voltage
    • ±1V minimum output voltage
    • 1A maximum output current
    • True return to zero to discharge output to ground
    • Second harmonic of -40dBc at 5MHz
    • -3dB bandwidth with 400Ω || 125pF load
      • 22MHz for a ±100V supply
    • 0.1mW/ch very low receive power
  • Active Transmit/Receive (T/R) switch:
    • 26Ω turn on resistance
    • 100ns turn on and turn off time
    • 10mVPP transient glitch
  • On-chip beam former:
    • Channel-based T/R switch on and off controls
    • Delay resolution: half beamformer clock period, minimum 2.5ns
    • Maximum delay: 214 beamformer clock period
    • 200MHz maximum beamformer clock speed
    • On-chip RAM for pattern and delay profile
    • One 512 x 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: ≈2.5µs 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
    • FC-BGA-196 (12mm x 12mm) with 0.8mm pitch small package

Applications

  • Ultrasound imaging system
  • Piezoelectric driver
  • In-probe ultrasound imaging

Simplified Block Diagram

Block Diagram - Texas Instruments TX7364 Analog Front End (AFE) Transmitter
Publicado: 2024-07-12 | Actualizado: 2024-07-25