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Analog Devices Inc./Maxim Integrated MAX11666AUB/V+
- Part No.:
- MAX11666AUB/V+
- 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/V+.pdf
- Description:
- IC ADC 12BIT SAR 10UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:126
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Product details
Overview
MAX11666AUB/V+ from Maxim Integrated is a 12-bit, dual-channel, single-ended successive approximation ADC with 500ksps throughput, 72.5dB SNR, and operation from 2.2V to 3.6V supply. It features external reference input (REF), separate digital I/O supply (OVDD), and 10-pin FMAX-EP package. Designed for automotive-grade signal acquisition in battery-constrained systems.
For engineers reviewing the MAX11666AUB/V+ datasheet, MAX11666AUB/V+ pinout, MAX11666AUB/V+ application, or MAX11666AUB/V+ equivalent, key selection criteria include its automotive qualification (-40°C to +125°C), dual-channel crosstalk rejection (-90dB), 1.3µA power-down current, and SPI/QSPI/MICROWIRE-compatible 3-wire serial interface requiring no level-shifting logic.
Technical Context
The MAX11666AUB/V+ integrates a high-dynamic-range sample-and-hold circuit and supports full-scale analog input from 0V to VREF (1V to VDD + 0.05V). Its dual-input architecture uses an internal 2:1 MUX to route AIN1 or AIN2 to the ADC core, enabling time-multiplexed sampling without external switching.
It implements a 3-wire serial interface with CS, SCLK, and DOUT - compatible with SPI, QSPI, and MICROWIRE protocols at up to 8MHz clock frequency. The device supports variable I/O voltage (1.5V to 3.6V on OVDD) and includes dedicated AGND and GND pins for analog/digital separation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12 bits - delivers 4096 discrete output codes for high-fidelity sensor digitization |
| Throughput Rate | 500 ksps - enables real-time capture of signals up to 2.5 MHz full-linear bandwidth (SINAD > 68 dB) |
| SNR | 70.5–72.5 dB typical - ensures accurate low-noise measurement of small-signal transducers |
| Power Consumption | 3.3 mW at full operation (1.67 mA @ VDD = 2.2V) - optimized for portable and always-on automotive subsystems |
| Power-Down Current | 1.3 µA - minimizes quiescent drain during sleep modes in battery-powered ECUs |
| Crosstalk | -90 dB - guarantees channel isolation for simultaneous dual-sensor monitoring without interference |
| Aperture Jitter | 15 ps - preserves timing integrity for high-frequency AC signal sampling |
| Operating Temperature | -40°C to +125°C - meets AEC-Q100 Grade 2 automotive reliability requirements |
Pinout & Package
MAX11666AUB/V+ is housed in a 10-pin FMAX-EP package (3mm × 5mm, exposed pad), thermally enhanced for automotive environments. The exposed pad must be connected to AGND for proper operation and thermal dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - AIN1 | Analog Input Channel 1 | Single-ended input referenced to AGND; accepts 0V to VREF range; used for primary sensor channel |
| 2 - AIN2 | Analog Input Channel 2 | Single-ended input referenced to AGND; identical electrical specs to AIN1; selected via CHSEL |
| 3 - OVDD | Digital I/O Supply | Independent 1.5V–3.6V supply for SCLK/CS/CHSEL/DOUT; enables direct interfacing with low-voltage microcontrollers |
| 4 - AGND | Analog Ground | Reference return for analog circuitry; must be isolated from digital ground except at single-point connection |
| 5 - CHSEL | Channel Select Input | Logic-controlled selection between AIN1 (low) and AIN2 (high); sampled at CS falling edge |
| 6 - REF | External Reference Input | Accepts 1V to (VDD + 0.05V); sets full-scale range; improves accuracy vs. internal VDD-based reference |
| 7 - CS | Chip Select | Active-low enable for serial interface; initiates conversion on falling edge; controls DOUT three-state behavior |
| 8 - SCLK | Serial Clock Input | Up to 8 MHz clock; defines timing for data transfer and conversion control; 40–60% duty cycle required |
| 9 - DOUT | Serial Data Output | 3-state CMOS output; MSB-first 12-bit result; high-impedance when CS is high or during acquisition |
| 10 - VDD | Analog/Digital Core Supply | 2.2V–3.6V main supply powering ADC core, reference buffer, and internal logic; decoupling required |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay | Successive approximation architecture delivers first valid conversion result within one clock cycle after CS assertion |
| Variable I/O voltage support | OVDD pin allows direct connection to 1.5V/1.8V/2.5V/3.0V logic families without level shifters |
| Automotive qualification | /V+ suffix denotes AEC-Q100 qualified part with guaranteed operation over -40°C to +125°C ambient |
| Low-noise analog front-end | 73 dB SNR and -90 dB crosstalk enable simultaneous high-precision acquisition from two sensors |
| Fast wake-up from power-down | 1 conversion cycle (≈2 µs) power-up time enables burst-mode sampling to conserve energy |
| High-speed serial interface | 3-wire SPI-compatible protocol eliminates need for additional control lines or glue logic |
Applications
| Automotive Battery Monitoring | Medical Patient Vital Sensors |
|---|---|
Use Scenario: Real-time voltage and temperature sampling across multiple 12V battery cells in EV/HEV BMS. IC Role / Device Role / Timing Role: Dual-channel ADC digitizes cell voltage (AIN1) and thermistor output (AIN2) with synchronized sampling and <2.5 µs inter-channel skew. Use Value: -90 dB crosstalk prevents thermal reading corruption from high-voltage switching noise; 12-bit resolution detects <1mV changes at 12V scale. |
Use Scenario: Simultaneous acquisition of ECG and SpO₂ analog signals in portable patient monitors. IC Role / Device Role / Timing Role: Single-chip dual-input digitization replaces two discrete ADCs; REF pin enables stable 2.5V reference for clinical-grade accuracy. Use Value: 72.5 dB SNR ensures clean waveform capture; 1.3 µA power-down current extends battery life during standby intervals. |
| Industrial Motor Control Feedback | Portable Data Logging Systems |
Use Scenario: Acquisition of motor phase current (shunt) and winding temperature (RTD) in compact servo drives. IC Role / Device Role / Timing Role: High-speed 500ksps sampling captures transient overcurrent events; CHSEL pin enables deterministic channel sequencing. Use Value: 40 MHz full-power bandwidth supports fast current loop response; 10-pin FMAX-EP package fits tight PCB layouts near motor terminals. |
Use Scenario: Multi-sensor environmental logging (temperature, humidity, pressure) in handheld field instruments. IC Role / Device Role / Timing Role: Low-power ADC interfaces directly to 1.8V MCU; external REF ensures consistent scaling across varying battery voltage. Use Value: 3.3 mW active power and 1.3 µA shutdown current maximize runtime on coin-cell or Li-ion batteries. |
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 |
|---|---|---|---|
| MAX11664AUB+ | 10-bit resolution, same package and pinout; lower SNR (61.6 dB), higher INL (±0.5 LSB) | Suitable for cost-sensitive industrial sensing where 10-bit precision suffices | Select MAX11664AUB+ only if system SNR budget permits ≥10 dB degradation and 12-bit linearity is not required |
| ADS7953IRHBT | 12-bit, 8-channel, SPI interface; 1 MSPS rate; requires external reference; 32-pin VQFN | Better channel count but larger footprint and higher power (1.5 mW active, 10 µA shutdown) | Choose ADS7953IRHBT only when >2 channels are needed and board space allows 5×5 mm QFN |
Compared with MAX11664AUB+, MAX11666AUB/V+ provides 2 extra bits of resolution and 11 dB higher SNR at identical power and footprint; versus ADS7953IRHBT, it offers smaller size and lower shutdown current but fewer channels and lower max throughput.
Availability
MAX11666AUB/V+ is available at Aetrix Electronics and suitable for automotive battery management, medical vital sign monitoring, industrial motor feedback, and portable data logging requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX11666AUB/V+ 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) designs precision analog, mixed-signal, and power management ICs for demanding industrial, automotive, and medical applications.
The MAX11666AUB/V+ belongs to the MAX11661–MAX11666 family of low-power, high-speed SAR ADCs engineered specifically for space-constrained, battery-operated systems needing automotive-grade reliability and dual-channel flexibility.
FAQ
What is the operating temperature range for MAX11666AUB/V+?
The MAX11666AUB/V+ is rated for continuous operation from -40°C to +125°C ambient temperature. This specification is guaranteed per AEC-Q100 Grade 2 requirements, making it suitable for under-hood automotive applications and industrial environments with wide thermal excursions. The /V+ suffix explicitly denotes this automotive qualification.
Does MAX11666AUB/V+ require an external reference voltage?
Yes, MAX11666AUB/V+ supports - and is designed to use - an external reference voltage applied to the REF pin. The REF input accepts 1V to (VDD + 0.05V) and sets the full-scale range for both AIN1 and AIN2. Using an external reference improves accuracy and stability compared to relying on the internal VDD-based reference, especially in noisy or varying supply conditions.
Can MAX11666AUB/V+ interface directly with a 1.8V microcontroller?
Yes, MAX11666AUB/V+ can interface directly with a 1.8V microcontroller via its OVDD pin. By supplying 1.8V to OVDD, the SCLK, CS, CHSEL, and DOUT signals operate at 1.8V logic levels - eliminating the need for external level shifters. The VDD supply (2.2V–3.6V) remains independent for analog performance, preserving SNR and linearity.
What is the maximum serial clock frequency supported by MAX11666AUB/V+?
The MAX11666AUB/V+ supports a maximum serial clock (SCLK) frequency of 8 MHz, as specified in its electrical characteristics table. At this rate and with 50% duty cycle, the device achieves its full 500 ksps throughput. Timing parameters such as t4 (data access time) and t7 (data hold time) are validated up to this frequency, ensuring reliable communication with standard SPI peripherals.
How does the CHSEL pin function in MAX11666AUB/V+?
The CHSEL pin on MAX11666AUB/V+ selects which analog input channel is converted: AIN1 when CHSEL is low, and AIN2 when CHSEL is high. The channel selection is latched on the falling edge of CS, enabling deterministic, software-controlled channel sequencing without interrupting the conversion flow. This eliminates the need for external multiplexers in dual-sensor systems.
MAX11666AUB/V+ 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/V+ FAQ
1.How can I place an order for MAX11666AUB/V+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX11666AUB/V+ 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/V+ reliable?
The price and inventory of MAX11666AUB/V+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX11666AUB/V+ is usually 5 days.
3.What payment methods are accepted for MAX11666AUB/V+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX11666AUB/V+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX11666AUB/V+?
MAX11666AUB/V+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX11666AUB/V+ 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/V+?
For technical support, including MAX11666AUB/V+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX11666AUB/V+ requirements.
6.How does Aetrix verify that MAX11666AUB/V+ is sourced from the original manufacturer or authorized distributors?
All MAX11666AUB/V+ 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/V+ meets industry standards.
7.What is the process for return or replacement of MAX11666AUB/V+?
All MAX11666AUB/V+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX11666AUB/V+, 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/V+ part is unused and in its original packaging.
Return procedure for MAX11666AUB/V+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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