Analog Devices Inc./Maxim Integrated MAXQ7667AACM/V+T

Overview

The MAXQ7667AACM/V+T from Maxim Integrated is a 16-bit RISC microcontroller-based ultrasonic distance-measuring SoC optimized for large-range, weak-signal, and multi-target time-of-flight applications. It integrates a programmable burst generator (25–100 kHz), echo reception path with 0.7 µV_RMS input-referred noise LNA, 16-bit sigma-delta ADC, digital bandpass/lowpass filters, and an embedded MAXQ20 core-all operating across –40°C to +125°C in a 48-pin LQFP package.

For engineers reviewing the MAXQ7667AACM/V+T datasheet, MAXQ7667AACM/V+T pinout, MAXQ7667AACM/V+T application, or MAXQ7667AACM/V+T equivalent, this page delivers verified functional identity, validated pin roles, confirmed automotive-grade thermal and supply specifications (+2.5V/+3.3V/+5V operation), and real-world sensing performance metrics including 10 µV_P-P minimum detectable signal and 50 kHz burst frequency stability ±0.05 kHz over temperature.

Technical Context

The MAXQ7667AACM/V+T implements a closed-loop smart sensing architecture: its embedded 16-bit MAXQ20 microcontroller dynamically adjusts burst frequency and echo reception parameters-including VGA gain (0.1–1.55 µV_P-P/LSB), bandpass center frequency (25–100 kHz), and PLL lock timing (<2 ms)-in response to real-time echo signal conditions and ambient temperature. All DSP filtering (bandpass at 10×f_BPF, lowpass at 5×f_BPF) executes autonomously without CPU intervention.

Its analog front-end features dual ADC subsystems: a 16-bit sigma-delta ADC for echo digitization (80×f_BPF sampling rate) and a 5-channel 12-bit SAR ADC (250 ksps max) with internal 2.5 V bandgap reference (±0.5% initial accuracy). Power management includes three independent linear regulators (REG2P5, REG3P3, DVDDIO control via GATE5) enabling single-supply operation from +8 V to +65 V using an external pass transistor.

Key Specifications

Pinout & Package

MAXQ7667AACM/V+T is housed in a 48-pin LQFP package (7 mm × 7 mm, 0.5 mm pitch) with exposed thermal pad. Pin functions are electrically and thermally optimized for ultrasonic sensing: dedicated ECHOP/ECHON differential inputs, burst output (BURST), analog/digital power separation (AVDD/DGND/AGND), and integrated regulator control (GATE5, REG2P5, REG3P3).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar ultrasonic distance-measuring applications.

Compared with TDC1000IPWR and MAX35101ETX+, the MAXQ7667AACM/V+T uniquely combines automotive-grade thermal resilience (–40°C to +125°C), integrated multi-rail power management (including GATE5-controlled +5 V regulation), and autonomous echo optimization-making it the only single-chip solution qualified for direct replacement in AEC-Q100 parking assist modules.

Availability

MAXQ7667AACM/V+T is available at Aetrix Electronics and suitable for automotive parking assist, industrial tank level sensing, and handheld ultrasonic distance meter applications requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.

Supply support for MAXQ7667AACM/V+T includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Maxim Integrated (now part of Analog Devices) is a semiconductor company specializing in precision analog, mixed-signal, and high-reliability ICs for automotive, industrial, and communications markets.

The MAXQ7667 product line delivers fully integrated ultrasonic time-of-flight SoCs targeting automotive ADAS, industrial automation, and portable sensing-designed to replace multi-chip discrete solutions with deterministic, temperature-adaptive echo processing.

FAQ

What is the primary function of the MAXQ7667AACM/V+T in ultrasonic sensing systems?

The MAXQ7667AACM/V+T serves as a complete ultrasonic time-of-flight system-on-a-chip, integrating burst generation, echo reception (LNA + 16-bit sigma-delta ADC), digital signal processing (bandpass/lowpass filters), and a 16-bit MAXQ20 microcontroller. It autonomously optimizes sensing parameters per transmission-eliminating the need for external processors in applications like automotive parking assist and tank level monitoring. The MAXQ7667AACM/V+T performs all critical signal chain functions on-die.

Does the MAXQ7667AACM/V+T support automotive qualification standards?

Yes, the MAXQ7667AACM/V+T is explicitly automotive-qualified: the "/V" suffix denotes AEC-Q100 compliance, and it operates across –40°C to +125°C with built-in supply supervisors (DVDD reset at 2.25 V), watchdog timer, and LIN 2.0-compatible UART interface. Its robust analog front-end-including 0.7 µV_RMS input noise and 10 µV_P-P minimum detectable signal-meets stringent requirements for under-hood parking assist modules. The MAXQ7667AACM/V+T is designed for direct integration into automotive ECUs.

How does the MAXQ7667AACM/V+T manage power supply flexibility?

The MAXQ7667AACM/V+T supports three distinct power architectures: (1) discrete +2.5 V, +3.3 V, and +5 V supplies; (2) single +5 V input with internal REG2P5 and REG3P3 regulators powering DVDD and AVDD; or (3) wide-input single supply (+8 V to +65 V) using the GATE5 output to drive an external pass transistor for DVDDIO regulation. This eliminates external LDOs in space-constrained designs. The MAXQ7667AACM/V+T's multi-rail architecture ensures compatibility with diverse system-level power topologies.

What interfaces does the MAXQ7667AACM/V+T provide for host communication?

The MAXQ7667AACM/V+T offers UART (LIN 2.0-compliant at 1–20 kbps), SPI (master/slave up to 8 MHz), and JTAG for programming and debug. Its UART supports both asynchronous and synchronous modes, with TXEN pin enabling external transceiver control-essential for automotive LIN bus integration. GPIO pins (P0.x/P1.x) provide additional digital I/O for status signaling or simple sensor interfacing. The MAXQ7667AACM/V+T does not require external level shifters for standard 5 V or 3.3 V logic domains.

Can the MAXQ7667AACM/V+T operate without an external crystal?

Yes-the MAXQ7667AACM/V+T includes an internal 13.5 MHz RC oscillator (±10.5% initial accuracy, 700 ppm temperature drift) usable as system clock source. However, for ultrasonic timing-critical applications requiring stable burst and ADC sampling clocks, the integrated crystal oscillator (4–16 MHz, ±25 ppm stability) is recommended. The MAXQ7667AACM/V+T automatically selects clock source based on configuration; XIN/XOUT pins may be left unconnected if RC mode is used. The MAXQ7667AACM/V+T supports seamless clock source switching during operation.