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Analog Devices Inc./Maxim Integrated MAX11666AUB+
- Part No.:
- MAX11666AUB+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
MAX11666AUB+.pdf
- Description:
- IC ADC 12BIT SAR 10UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:1,545
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Product details
Overview
MAX11666AUB+ from Maxim Integrated is a 12-bit, dual-channel, single-ended successive-approximation ADC with 500ksps throughput, 72.5dB SNR, and 2.2V–3.6V supply operation. It features external reference input (REF), separate digital I/O supply (OVDD), and SPI/QSPI/MICROWIRE-compatible 3-wire serial interface - designed for high-accuracy sensor signal digitization in space-constrained industrial and automotive systems.
For engineers reviewing the MAX11666AUB+ datasheet, MAX11666AUB+ pinout, MAX11666AUB+ application, or MAX11666AUB+ equivalent, key selection considerations include its dual-channel 12-bit resolution, external reference support, -40°C to +125°C operation, low 3.3mW power consumption at full speed, and 10-pin FMAX-EP package with exposed pad grounded per spec.
Technical Context
The MAX11666AUB+ implements a fully differential sample-and-hold architecture with internal clock generation and no pipeline delay. Its dual analog inputs (AIN1/AIN2) are routed through a 2:1 MUX to a single 12-bit SAR core, enabling channel-selectable conversion without interleaving artifacts.
It supports independent OVDD (1.5V–3.6V) for digital interface voltage scaling and accepts an external reference (REF) from 1V to VDD+0.05V. Timing is controlled via CS-active-low frame synchronization and SCLK-driven serial output, with aperture jitter of 15ps and acquisition time of 52ns.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12 bits - delivers 1 LSB = VREF/4096 quantization step for high-precision sensor measurements. |
| Throughput Rate | 500 ksps - enables real-time sampling of signals up to 250 kHz Nyquist bandwidth with no pipeline latency. |
| SNR | 72.5 dB typical - supports >11.7 effective number of bits (ENOB) for clean dynamic signal capture. |
| Supply Voltage | 2.2 V to 3.6 V - compatible with Li-ion, 3.3 V, and regulated 2.5 V rails in portable and automotive applications. |
| Power Consumption | 3.3 mW at 500 ksps - achieves 6.6 µW per sample, critical for battery-powered data loggers. |
| Operating Temperature | -40°C to +125°C - qualified for under-hood automotive, industrial control, and harsh-environment monitoring. |
| Reference Input | External REF pin (1 V to VDD+0.05 V) - allows precision ratiometric or absolute measurement using stable external references. |
Pinout & Package
MAX11666AUB+ is housed in a 10-pin FMAX-EP package (3mm × 5mm, 0.5mm pitch) with exposed thermal pad requiring connection to ground plane per datasheet requirement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 AIN1 | Analog input channel 1 | Single-ended input referenced to AGND; 0V to VREF range; 20pF track capacitance. |
| 2 AIN2 | Analog input channel 2 | Single-ended input referenced to AGND; identical specs to AIN1; supports channel multiplexing. |
| 3 OVDD | Digital I/O supply | Independent 1.5V–3.6V rail for SCLK/CS/CHSEL/DOUT logic levels; decoupling required. |
| 4 AGND | Analog ground | Separate ground return for analog circuitry; must be tied to system GND at single point. |
| 5 CHSEL | Channel select input | Active-high control to select AIN1 (low) or AIN2 (high); sampled on CS falling edge. |
| 6 REF | External reference input | Accepts precision reference (1V–VDD+0.05V); 5pF input capacitance; leakage <1pA. |
| 7 CS | Chip select | Active-low frame sync; initiates conversion and enables DOUT three-state output. |
| 8 VDD | Analog/digital core supply | Primary 2.2V–3.6V supply for SAR core, sample-and-hold, and internal logic. |
| 9 SCLK | Serial clock input | 0.08–8 MHz clock; controls bit transfer timing; 40–60% duty cycle required. |
| 10 DOUT | Serial data output | 3-wire SPI-compatible MSB-first output; tri-stated when CS high; 4pF load capacitance. |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay | Successive-approximation architecture ensures deterministic 1.56 µs conversion time - critical for closed-loop control timing. |
| Dual single-ended inputs | Hardware-multiplexed AIN1/AIN2 with dedicated CHSEL pin eliminates need for external analog mux or firmware sequencing. |
| Variable I/O voltage | OVDD pin enables direct interfacing with 1.5V, 1.8V, 2.5V, or 3.0V digital controllers without level shifters. |
| Low-power management | 1.3 µA power-down current and fast wake-up allow microsecond-scale sleep/wake cycles in duty-cycled systems. |
| High dynamic performance | 72.5 dB SNR and -85 dB THD at 250 kHz input enable accurate capture of wide-dynamic-range sensor outputs. |
Applications
| Industrial Sensor Interface | Automotive Battery Monitoring |
|---|---|
|
Use Scenario: Digitizing thermocouple, RTD, or strain gauge outputs in PLC analog input modules. IC Role / Device Role / Timing Role: Primary 12-bit ADC capturing two sensor channels with ratiometric accuracy using external reference. Use Value: 72.5 dB SNR and -40°C to +125°C operation ensure stable measurement integrity across factory floor temperature swings. |
Use Scenario: Monitoring individual cell voltages in 12S lithium-ion battery packs for EV and ESS systems. IC Role / Device Role / Timing Role: Dual-channel ADC sampling adjacent cells synchronously via CHSEL control for voltage delta analysis. Use Value: External REF pin enables precise ratiometric measurement against a stable bandgap reference, improving SOC estimation accuracy. |
| Portable Medical Instrumentation | Condition Monitoring Edge Node |
|
Use Scenario: Signal acquisition in handheld ECG or pulse oximetry devices powered by coin-cell batteries. IC Role / Device Role / Timing Role: Low-power 12-bit ADC digitizing biopotential signals with minimal board space and thermal load. Use Value: 3.3 mW active power and 1.3 µA shutdown current extend battery life while maintaining diagnostic-grade SNR. |
Use Scenario: Vibration and temperature sensing in predictive maintenance nodes deployed on motors or pumps. IC Role / Device Role / Timing Role: Dual-channel front-end ADC acquiring accelerometer and thermistor signals for FFT-based anomaly detection. Use Value: 500 ksps throughput and 40 MHz full-power bandwidth support high-fidelity time-domain waveform capture. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel, 12-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7953IRHBT | 12-bit, 8-channel, SPI interface; 1 MSPS; requires external reference; 32-pin VQFN. | Higher channel count and speed but larger footprint and higher power (12 mW). | Select when multi-channel expansion beyond two inputs is needed and PCB area permits larger package. |
| AD7476AARMZ | 12-bit, single-channel, SPI interface; 1 MSPS; internal reference only; 8-pin MSOP. | Lacks dual-input capability and external REF support; lower integration for simple single-sensor use cases. | Choose only for cost-sensitive, single-channel designs where external reference flexibility is not required. |
Compared with ADS7953IRHBT and AD7476AARMZ, the MAX11666AUB+ uniquely balances dual-channel functionality, external reference support, ultra-low power (3.3 mW), and compact 10-pin FMAX-EP packaging - making it optimal for space- and energy-constrained dual-sensor systems operating across extended temperature ranges.
Availability
MAX11666AUB+ is available at Aetrix Electronics and suitable for industrial sensor interface, automotive battery monitoring, portable medical instrumentation, condition monitoring edge nodes, and precision data logging requiring stable component supply and long-term manufacturability.
Supply support for MAX11666AUB+ 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, communications, and computing markets.
The MAX11666AUB+ belongs to the MAX11661–MAX11666 family of low-power, high-speed SAR ADCs designed specifically for battery-operated and thermally constrained applications demanding precision, small size, and wide temperature operation.
FAQ
What is the maximum sampling rate supported by the MAX11666AUB+?
The MAX11666AUB+ supports a maximum throughput rate of 500 ksps, corresponding to a minimum conversion time of 1.56 µs. This rate is achievable with an SCLK frequency up to 8 MHz and proper timing margins per the datasheet's t2–t8 specifications. The device exhibits no pipeline delay, ensuring deterministic latency critical for real-time control loops.
Does the MAX11666AUB+ require an external reference voltage?
Yes, the MAX11666AUB+ requires an external reference voltage applied to the REF pin for full specified accuracy. It accepts 1 V to VDD+0.05 V, and the analog input range is 0 V to VREF. Unlike single-channel variants in the same family, the MAX11666AUB+ does not generate an internal reference - REF must be supplied externally.
What is the purpose of the OVDD pin on the MAX11666AUB+?
The OVDD pin on the MAX11666AUB+ supplies power to the digital interface (SCLK, CS, CHSEL, DOUT), allowing independent voltage scaling from 1.5 V to 3.6 V. This enables direct connection to low-voltage microcontrollers (e.g., 1.8 V or 2.5 V I/O domains) without level-shifting circuitry, reducing BOM count and layout complexity.
Can the MAX11666AUB+ operate over the full automotive temperature range?
Yes, the MAX11666AUB+ is fully specified and tested over -40°C to +125°C, meeting requirements for under-hood and cabin automotive applications. Its guaranteed DC accuracy (INL ±1 LSB, DNL no missing codes) and dynamic performance (72.5 dB SNR typical) are maintained across this range, with power-down current remaining ≤10 µA at +125°C.
How is channel selection implemented on the MAX11666AUB+?
Channel selection on the MAX11666AUB+ is performed using the CHSEL pin: logic low selects AIN1, logic high selects AIN2. The selected channel is sampled on the falling edge of CS, and conversion proceeds immediately. This hardware-controlled mux eliminates software overhead and ensures deterministic inter-channel timing alignment.
MAX11666AUB+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 500k
- Number of Inputs:
- 2
- Input Type:
- Single Ended
- Data Interface:
- SPI
- Configuration:
- MUX-S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- Supply
- Voltage - Supply, Analog:
- 2.2V ~ 3.6V
- Voltage - Supply, Digital:
- 2.2V ~ 3.6V
- Features:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Supplier Device Package:
- 10-uMAX-EP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX11666AUB+ FAQ
1.How can I place an order for MAX11666AUB+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX11666AUB+ 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 MAX11666AUB+ reliable?
The price and inventory of MAX11666AUB+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX11666AUB+ is usually 5 days.
3.What payment methods are accepted for MAX11666AUB+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX11666AUB+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX11666AUB+?
MAX11666AUB+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX11666AUB+ 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 MAX11666AUB+?
For technical support, including MAX11666AUB+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX11666AUB+ requirements.
6.How does Aetrix verify that MAX11666AUB+ is sourced from the original manufacturer or authorized distributors?
All MAX11666AUB+ 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 MAX11666AUB+ meets industry standards.
7.What is the process for return or replacement of MAX11666AUB+?
All MAX11666AUB+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX11666AUB+, 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 MAX11666AUB+ part is unused and in its original packaging.
Return procedure for MAX11666AUB+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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