MAXQ7667 Datasheet | Maxim Integrated

19-4598; Rev 0; 4/09 .. 16-Bit, RISC, Microcontroller-Based, Ultrasonic Distance-Measuring System General Description The MAXQ7667 smart system-on-a-chip (So C) 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 bining flexible electronics with the intelligence necessary to optimize each function as environmental and target conditions change. An integrated burst signal generator and echo reception ponents process ultrasonic signals between 25k Hz and 100k Hz. Echo reception ponents 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 transmitted and received parameters to obtain optimum results. Digital filtering and burst synthesis do not require CPU intervention. This leaves all the CPU power available for echo optimization, munication, diagnostics, and additional signal processing. The MAXQ7667 operates with three different power supply voltages: +5V, +3.3V, and +2.5V. Two internal linear regulators allow operation from a single +5V supply when three external power supplies are not available. Alternatively, the MAXQ7667...