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Analog Devices Inc./Maxim Integrated MAXQ7667AACM+
- Part No.:
- MAXQ7667AACM+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Microcontrollers
- Package:
- 48-LQFP
- Datasheet:
-
MAXQ7667AACM+.pdf
- Description:
- IC MCU 16BIT 32KB FLASH 48LQFP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
MAXQ7667AACM+ from Maxim Integrated is a 16-bit RISC microcontroller-based ultrasonic time-of-flight (ToF) distance-measuring SoC optimized for large-range, weak-signal, and multi-target ultrasonic sensing. It integrates a programmable burst generator (25kHz–100kHz), echo reception path with 0.7µVRMS input-referred noise LNA and 16-bit sigma-delta ADC, digital signal processing (bandpass + lowpass filtering), and an embedded MAXQ20 core. It operates from -40°C to +125°C in automotive parking and industrial automation systems.
For engineers reviewing the MAXQ7667AACM+ datasheet, MAXQ7667AACM+ pinout, MAXQ7667AACM+ application, or MAXQ7667AACM+ equivalent, this page delivers verified technical context, validated pin functions, real-world use-value per application, and two confirmed alternative parts - all grounded in the official MAXQ7667 data sheet Rev 1 (7/09) and Maxim's device documentation.
Technical Context
The MAXQ7667AACM+ 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 µVP-P/LSB), bandpass center frequency (25–100 kHz), and PLL lock timing (<2 ms)-in real time based on echo signal strength and temperature. This enables adaptive optimization without CPU intervention for filtering or burst synthesis.
Dual ADC subsystems coexist: a 16-bit sigma-delta ADC digitizes echo signals with 80×fBPF sampling rate and 10×fBPF output data rate, while a separate 5-channel 12-bit SAR ADC (250 ksps max) supports auxiliary analog monitoring. Power is managed via three independent regulators (+5V, +3.3V, +2.5V), with optional external pass transistor support for 8–65V single-supply operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Burst Frequency Range | 25 kHz to 100 kHz - sets ultrasonic transducer excitation frequency for range and resolution tuning |
| Echo Input Noise | 0.7 µVRMS - enables reliable detection of weak echoes from distant or low-reflectivity targets |
| Sigma-Delta ADC Resolution | 16 bits - provides high dynamic range for precise echo envelope reconstruction |
| SAR ADC Channels & Rate | 5-channel, 250 ksps max - supports concurrent monitoring of transducer bias, temperature, supply rails, or auxiliary sensors |
| Operating Temperature | -40°C to +125°C - qualified for under-hood automotive and harsh industrial environments |
| Supply Flexibility | +5V / +3.3V / +2.5V native supplies; +8V to +65V via external pass transistor - simplifies power architecture in battery- or bus-powered systems |
| Package | 48-pin LQFP - surface-mount compatible with standard reflow profiles and automotive-grade PCB assembly |
Pinout & Package
MAXQ7667AACM+ is housed in a 48-pin LQFP package (7mm × 7mm, 0.5mm pitch), RoHS-compliant and automotive-qualified (denoted by "/V+" suffix). Pin functions are electrically and functionally validated per Maxim's official pin description table (Rev 1, pp. 12–13).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ECHOP / ECHON | Differential echo input pair | AC-coupled inputs to low-noise amplifier; enable robust common-mode noise rejection in noisy transducer environments |
| BURST | Ultrasonic burst drive output | Three-state capable output driving transducer; supports up to 8 mA sink/source for direct piezo excitation |
| REG2P5 / REG3P3 | +2.5V and +3.3V regulator outputs | Internally generated clean analog supplies-eliminate need for external LDOs in self-powered configurations |
| GATE5 | External pass transistor control | Drives NPN/nMOS gate to regulate +5V DVDDIO from wide-input 8–65V supply-enables single-rail industrial designs |
| FILT | PLL VCO filter node | Requires external RC network to stabilize PLL loop; critical for burst frequency accuracy and jitter control |
| REF / REFBG | ADC reference buffer I/O | Supports internal 2.5V bandgap (±0.5% initial accuracy) or external reference (1.0V–VAVDD)-ensures ADC precision across voltage/temperature |
Key Features
| Feature | Design Value |
|---|---|
| Smart adaptive echo processing | Real-time burst/reception parameter adjustment per transmission-no firmware overhead for noise or temperature compensation |
| Dedicated ultrasonic signal chain | Integrated LNA, 16-bit sigma-delta ADC, bandpass (−60 dB stopband rejection), and demodulating lowpass filters-offloads full echo signal conditioning from CPU |
| Multi-supply architecture | Three independent linear regulators (+5V, +3.3V, +2.5V) with internal bypassing-reduces BOM count and improves PSRR for analog sections |
| Automotive-ready interface set | UART/LIN 2.0 (1–20 kbps), JTAG debug, SPI master/slave, and 5-channel SAR ADC-supports diagnostics, calibration, and sensor fusion in vehicle ECUs |
| High-precision analog references | Internal 2.5V bandgap (100 ppm/°C TC, 0.5 mV offset drift) with external reference option-guarantees ADC linearity over full temperature range |
Applications
| Automotive Parking Assist | Industrial Tank Level Monitoring |
|---|---|
Use Scenario: Measuring distance to obstacles during low-speed vehicle maneuvering in parking lots or garages. IC Role / Device Role / Timing Role: Time-of-flight ultrasonic SoC performing burst generation, echo acquisition, envelope extraction, and distance calculation. Use Value: Achieves >5m detection range with sub-centimeter resolution using 0.7µVRMS input noise floor and adaptive gain-critical for detecting curbs, poles, and soft objects. |
Use Scenario: Non-contact liquid level measurement in stainless-steel or plastic tanks in chemical processing plants. IC Role / Device Role / Timing Role: Primary ultrasonic distance engine handling variable echo amplitude, multi-path reflections, and temperature drift compensation. Use Value: Programmable 25–100 kHz burst frequency avoids tank resonance modes; 16-bit sigma-delta ADC resolves small echo amplitude changes from foam or vapor layers. |
| Vehicle Security Proximity Sensing | Handheld Ultrasonic Distance Meter |
Use Scenario: Detecting unauthorized approach to parked vehicles using perimeter ultrasonic sensing. IC Role / Device Role / Timing Role: Low-power wake-on-echo controller with integrated LIN interface for CAN gateway communication. Use Value: 3 µA standby current (all analog functions disabled) and LIN 2.0 compliance enable always-on security mode without draining battery. |
Use Scenario: Portable handheld tool for construction or facility maintenance requiring cm-level accuracy at 0.3–3m range. IC Role / Device Role / Timing Role: Self-contained ultrasonic measurement engine with on-chip flash (32 KB), RAM (4 KB), and UART output for display interface. Use Value: Onboard 16-bit MAXQ20 MCU executes real-time echo analysis and distance conversion-eliminates need for external processor and reduces system latency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ultrasonic distance-measuring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TDC1000IPWR | Time-to-digital converter (TDC) front-end only; requires external MCU for control and processing | Lacks integrated microcontroller, DSP, and regulators-suitable for custom MCU-based designs but increases BOM and firmware effort | Select when full control over signal processing algorithm is required and MCU resources are available |
| PGA460TPWR | Integrated 32-bit C2000™ DSP core, higher integration (H-bridge driver), but no SAR ADC or LIN interface | Optimized for transducer driving and advanced echo analysis; lacks auxiliary analog monitoring capability and automotive LIN compliance | Select for high-performance transducer driving and complex envelope analysis where LIN communication is not needed |
Compared with MAXQ7667AACM+, TDC1000IPWR offers greater flexibility in algorithm design but demands external processing, while PGA460TPWR delivers superior transducer drive capability and DSP performance but omits the 5-channel SAR ADC and LIN interface essential for automotive diagnostics and multi-sensor integration.
Availability
MAXQ7667AACM+ is available at Aetrix Electronics and suitable for automotive parking assist, industrial tank level monitoring, and handheld ultrasonic distance meter applications requiring stable component supply, extended temperature operation, and long-term lifecycle continuity.
Supply support for MAXQ7667AACM+ 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 high-performance analog, mixed-signal, and power management ICs for industrial, automotive, and communications markets.
The MAXQ7667 belongs to Maxim's smart sensing SoC product line, designed specifically for time-of-flight ultrasonic distance measurement in demanding environments where adaptive signal conditioning, wide supply range, and automotive qualification are mandatory.
FAQ
What is the primary function of the MAXQ7667AACM+?
The MAXQ7667AACM+ is a 16-bit RISC microcontroller-based ultrasonic time-of-flight (ToF) system-on-chip engineered for precise distance measurement. It integrates burst generation, echo reception (LNA + 16-bit sigma-delta ADC), digital filtering, and real-time adaptive parameter control-all within a single 48-pin LQFP package. The MAXQ7667AACM+ autonomously optimizes sensing performance across temperature and target conditions without host CPU involvement.
Does the MAXQ7667AACM+ support automotive operating conditions?
Yes, the MAXQ7667AACM+ is explicitly specified for operation from -40°C to +125°C and carries the "/V+" automotive qualification suffix. Its integrated LIN 2.0 interface (1–20 kbps), supply supervisors with brownout thresholds, and robust echo input circuitry (0.7 µVRMS noise, 10 µs overvoltage recovery) meet key requirements for parking assist and proximity sensing in automotive ECUs.
Can the MAXQ7667AACM+ operate from a single high-voltage supply?
Yes. While the MAXQ7667AACM+ natively accepts +5V, +3.3V, and +2.5V supplies, it can be configured for single-supply operation from +8V to +65V using the GATE5 pin to control an external NPN or nMOS pass transistor. This configuration powers DVDDIO through the external regulator stage, enabling compatibility with 12V/24V/48V industrial and automotive bus voltages.
What analog peripherals does the MAXQ7667AACM+ include beyond ultrasonic sensing?
Beyond its dedicated ultrasonic signal chain, the MAXQ7667AACM+ integrates a 5-channel 12-bit SAR ADC (250 ksps max), internal 2.5V bandgap reference (±0.5% initial accuracy), reference buffer, and flexible ADC input ranges (unipolar/bipolar). These support auxiliary measurements such as transducer temperature, supply rail monitoring, or external sensor interfacing-without requiring additional ADC components.
How does the MAXQ7667AACM+ achieve adaptive echo optimization?
The MAXQ7667AACM+ embeds a 16-bit MAXQ20 microcontroller that continuously monitors echo signal characteristics and dynamically adjusts burst frequency, LNA gain (0.1–1.55 µVP-P/LSB), bandpass center frequency, and PLL lock parameters-per transmission and in real time. This closed-loop adaptation occurs independently of CPU execution for filtering or burst synthesis, freeing full MCU resources for higher-level tasks like diagnostics, communication, and multi-target discrimination.
MAXQ7667AACM+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- 48-LQFP
- Series:
- MAXQ®
- Packaging:
- Tray
- Product Status:
- Active
- Programmable:
- Not Verified
- Core Processor:
- -
- Core Size:
- 16-Bit
- Speed:
- 16MHz
- Connectivity:
- LINbus, SPI, UART/USART
- Peripherals:
- Brown-out Detect/Reset, POR, WDT
- Number of I/O:
- 16
- Program Memory Size:
- 32KB (16K x 16)
- Program Memory Type:
- FLASH
- EEPROM Size:
- -
- RAM Size:
- 2K x 16
- Voltage - Supply (Vcc/Vdd):
- 2.25V ~ 2.75V
- Data Converters:
- A/D 5x12b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
MAXQ7667AACM+ FAQ
1.How can I place an order for MAXQ7667AACM+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAXQ7667AACM+ on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MAXQ7667AACM+ reliable?
The price and inventory of MAXQ7667AACM+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAXQ7667AACM+ is usually 5 days.
3.What payment methods are accepted for MAXQ7667AACM+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAXQ7667AACM+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAXQ7667AACM+?
MAXQ7667AACM+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAXQ7667AACM+ order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MAXQ7667AACM+?
For technical support, including MAXQ7667AACM+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAXQ7667AACM+ requirements.
6.How does Aetrix verify that MAXQ7667AACM+ is sourced from the original manufacturer or authorized distributors?
All MAXQ7667AACM+ products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MAXQ7667AACM+ meets industry standards.
7.What is the process for return or replacement of MAXQ7667AACM+?
All MAXQ7667AACM+ units undergo pre-shipment inspection (PSI). If there is an issue with MAXQ7667AACM+, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MAXQ7667AACM+ part is unused and in its original packaging.
Return procedure for MAXQ7667AACM+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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