Ultrasonic air transducers

MAXQ7667

• MAXQ7667 SOC Datasheet
• MAXQ7767 Evaluation Kit with Schematics
• MAXQ7667 User Guide (Sectoin 17 describes Ultrasonic Dist. Meas. Module)
  • Above Datasheets suggest using Ultrasonic Transducers driven by a Transformer that is driven by a MOSFET in ON/OFF mode.
  • Evaluation Kit Datasheet depicts the peripherals' schamatics on page 11.

Transducers

• Tx and Rx Separate Components, farnell, EUR14.24
• Tx and RX on Single Module, farnell, ~EUR 15
• Prowave USTransducers Range, Includes High Power Models, 200LM450 looks interesting
  • Provawe 200LM450, Distance Range 0.3m to 50m, max P=50Watts
    • Available from Maplin, £59.99, !!To be Confirmed!!

Transformers

• Transformer1, farnell, EUR8.33
• Transformer2, farnell, EUR10.62
  • The two transformers above are not a preferred choice for this application.

Alternatives to MAXQ7667

• Texas Instruments, MSP430-based, farnell, <EUR5 (excl. peripherals)
  • This system uses the TI MCU in conjunction with peripheral circuitry cimilar to that of the MAXQ7667. The schematic diagram is provided, along with the Assembly source code.
  • It uses two separate Transducers,Tx and Rx.
  • It does NOT use any Transformers.
  • Key Peripherals:
    • Switch Transistor
    • High Slew Rate OP-Amps
    • Low Dropout Voltage Reg.