MAXQ7667

19-4598; Rev 0; 4/09 www.DataSheet4U.com 16-Bit, RISC, Microcontroller-Based, Ultrasonic Distance-Measuring System General Description The MAXQ7667 smart system-on-a-chip (SoC) provides a time-of-flight ultrasonic distance-measuring solution. The device is optimized for applications involving large distance measurement with weak input signals or multiple target identification. The MAXQ7667 features high signalto-noise ratio achieved by combining flexible electronics with the intelligence necessary to optimize each function as environmental and target conditions change. An integrated burst signal generator and echo reception components process ultrasonic signals between 25kHz and 100kHz. Echo reception components include a programmable gain low-noise amplifier (LNA), a 16-bit sigma-delta ADC to digitize the received echo signals, and digital signal processing (DSP). DSP limits noise with a bandpass filter, and creates an echo envelope through demodulation and lowpass filtering. Input referred noise is a low 0.7µV RMS . A programmable phase-locked loop (PLL) frequency synthesizer supplies the reference frequency for the burst generator and the clock for the echo receiver’s digital filter. An embedded 16-bit MAXQ20 microcontroller (µC) controls all the preceding functions. The µC optimizes the burst frequency and reception frequency for each transmission at any temperature. The MAXQ7667 achieves smart sensing by monitoring the echo signals and then actively changing the transm...