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Analog Devices Inc./Maxim Integrated MAX11331ATJ+
- Part No.:
- MAX11331ATJ+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
MAX11331ATJ+.pdf
- Description:
- IC ADC 12BIT SAR 32TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,793
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Product details
Overview
MAX11331ATJ+ from Maxim Integrated is a 12-bit, 16-channel SAR analog-to-digital converter with external reference support, 3Msps conversion rate, 500kHz full-linear bandwidth, and externally accessible multiplexer outputs (AOP/AON) and ADC inputs (AIP/AIN). It operates from 2.35V–3.6V, consumes 15.2mW at 3Msps, and targets high-speed data acquisition in battery-powered industrial sensors.
For engineers reviewing the MAX11331ATJ+ datasheet, MAX11331ATJ+ pinout, MAX11331ATJ+ application, or MAX11331ATJ+ equivalent, this page delivers verified technical context, real-world signal conditioning use cases, pin-level design meaning, and validated alternative options for multichannel, low-power, high-SNR systems.
Technical Context
The MAX11331ATJ+ implements a successive approximation register (SAR) architecture with dual clock modes: internal clock mode (with integrated 16-entry FIFO and programmable averaging) and external clock mode (featuring SampleSet™ - a user-defined 256-step channel sequencer). It supports flexible input configurations per channel: single-ended, fully differential, or pseudo-differential relative to REF−/AIN15.
Its analog front-end provides post-mux external access to AOP (mux positive output), AON (mux negative output), AIP (ADC positive input), and AIN (ADC negative input), enabling external signal conditioning before digitization. The device guarantees ±1 LSB INL/DNL, 70dB SINAD at 100kHz, and −88dB crosstalk across 16 channels.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete digital codes for precise voltage quantization in sensor and control loops. |
| Conversion Rate | 3Msps - enables real-time sampling of fast transients up to 500kHz full-linear bandwidth without pipeline delay. |
| SINAD | 70dB at 100kHz - ensures ≥11.3 effective bits for high-fidelity measurement in noisy industrial environments. |
| Power Dissipation | 15.2mW at 3V/3Msps - supports extended runtime in portable instrumentation and battery-powered edge nodes. |
| Input Configuration | 16 single-ended, 8 differential, or 15 pseudo-differential channels - allows mixed-signal routing on one IC without external mux reconfiguration. |
| Reference Support | External differential reference (1V to VDD) - enables ratiometric sensing and improved noise rejection versus internal reference. |
| Serial Interface | 48MHz 3-wire SPI/QSPI/MICROWIRE-compatible - eliminates level shifters when interfacing with common microcontrollers and DSPs. |
Pinout & Package
MAX11331ATJ+ is housed in a 32-pin, 5mm × 5mm TQFN package with exposed pad (EP), rated for −40°C to +125°C operation. Pin functions are validated per Maxim's official pin configuration diagram for MAX11331 (16-channel variant).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN0–AIN13 | Analog Input Channels | 14 dedicated single-ended/differential/pseudo-differential inputs; configurable per channel via control registers. |
| AOP / AON | Multiplexer Output Terminals | Provide direct access to mux output stage - enables external filtering, gain, or isolation before ADC sampling. |
| AIP / AIN | ADC Input Terminals | Accept conditioned signals directly into SAR core; require ≤15pF input capacitance during acquisition for linearity. |
| CNVST/AIN14 | Active-Low Conversion Start / Analog Input 14 | Hardware-triggered conversion initiation; doubles as 15th analog input when CNVST function disabled. |
| REF+ / REF−/AIN15 | Differential Reference Inputs | Support external precision reference; REF− also serves as 16th analog input or common-mode reference for pseudo-diff inputs. |
| CS / SCLK / DIN / DOUT / EOC | 3-Wire Serial Interface Signals | Enable SPI-compatible communication; EOC asserts low only in internal clock mode to indicate data readiness. |
| VDD / OVDD / DGND / GND / EP | Power & Ground Terminals | VDD powers analog core (2.35–3.6V); OVDD powers digital I/O (1.5–3.6V); EP must be soldered to PCB ground plane for thermal and noise performance. |
Key Features
| Feature | Design Value |
|---|---|
| SampleSet™ Channel Sequencer | User-programmable 256-step sequence reduces MCU polling overhead and enables autonomous multi-rate sampling (e.g., slow temp + fast vibration). |
| Post-Mux Signal Conditioning Access | AOP/AON and AIP/AIN pins allow insertion of external op-amps, filters, or protection circuits between mux and ADC - critical for anti-aliasing and ESD robustness. |
| Internal FIFO + Averaging | 16-entry FIFO buffers high-speed samples for asynchronous readout; internal averaging improves SNR by up to 3dB for noisy DC-coupled sensor signals. |
| Flexible Input Ranging | Software-selectable bipolar ranges (±VREF+/2 or ±VREF+) and unipolar (0 to VREF+) - simplifies interface to diverse transducer outputs without external level-shifting. |
| Low-Power Shutdown Modes | Full shutdown draws only 2µA; AutoShutdown™ automatically enters low-power state after conversion - essential for duty-cycled IoT endpoints. |
Applications
| Industrial Motor Control | Portable Medical ECG Monitor |
|---|---|
Use Scenario: Real-time acquisition of phase currents, bus voltage, and temperature in BLDC inverters with simultaneous 16-channel sampling. IC Role / Device Role / Timing Role: Primary ADC capturing synchronized analog feedback for closed-loop PWM generation and fault detection at 3Msps. Use Value: External AOP/AON access enables current-sense amplifier integration before digitization, preserving SNR while meeting IEC 61800-5-1 isolation requirements. |
Use Scenario: Battery-powered 12-lead ECG system requiring low-noise, low-power analog front-end with >70dB SINAD at 100Hz. IC Role / Device Role / Timing Role: High-accuracy digitizer for biopotential signals, leveraging internal averaging and differential input configuration to reject 50/60Hz interference. Use Value: 15.2mW power at 3Msps extends battery life beyond 8 hours; 12-bit resolution captures subtle ST-segment morphology for arrhythmia analysis. |
| Automotive Battery Management System | High-Speed Data Logger for Structural Testing |
Use Scenario: Monitoring cell voltages, pack current, and thermistor readings across 16 Li-ion cells in EV traction batteries. IC Role / Device Role / Timing Role: Multichannel ADC performing sequential sampling of isolated voltage rails using pseudo-differential mode referenced to REF−/AIN15. Use Value: ±1 LSB INL ensures <±1mV absolute accuracy over temperature; external reference support maintains ratiometric accuracy despite supply drift. |
Use Scenario: Capturing shock, vibration, and strain gauge outputs during crash or fatigue testing at sustained 3Msps rates. IC Role / Device Role / Timing Role: High-bandwidth digitizer interfaced to FPGA for real-time FFT and trigger-based storage. Use Value: 500kHz full-linear bandwidth enables undersampling of MHz-range mechanical resonances; 48MHz SPI interface sustains continuous streaming to DDR memory. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed, multichannel SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS8688IPWR | 8-channel, 16-bit, 1Msps, internal reference only, no post-mux pin access | Lacks AOP/AON/AIP/AIN pins - requires external mux and signal conditioning circuitry | Choose when higher resolution (16-bit) outweighs need for external conditioning flexibility and speed. |
| AD7960BCPZ | 18-bit, 5Msps, differential-only inputs, no integrated mux, no SampleSet sequencing | No channel multiplexing or programmable sequencing - requires external sequencer or FPGA control | Choose for ultra-high-precision single-channel or dual-channel applications where 18-bit ENOB justifies added system complexity. |
Compared with ADS8688IPWR and AD7960BCPZ, MAX11331ATJ+ uniquely combines 12-bit/3Msps performance, 16-channel integrated mux, post-mux pin access, and SampleSet™ sequencing - reducing BOM count and firmware burden in compact multichannel systems.
Availability
MAX11331ATJ+ is available at Aetrix Electronics and suitable for industrial motor control, portable medical instrumentation, automotive battery monitoring, and structural test data logging requiring stable component supply and guaranteed long-term availability.
Supply support for MAX11331ATJ+ 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, medical, and automotive applications.
The MAX11329–MAX11332 family was engineered to solve multichannel, low-power, high-SNR data acquisition challenges - specifically targeting systems needing external signal conditioning flexibility, autonomous sequencing, and robust operation across −40°C to +125°C.
FAQ
What is the maximum sampling rate supported by MAX11331ATJ+?
The MAX11331ATJ+ supports a guaranteed 3Msps conversion rate in both internal and external clock modes. At 48MHz SCLK, external clock mode achieves 333ns conversion time per sample. Full-linear bandwidth remains 500kHz, enabling accurate digitization of signals well above Nyquist when used with proper anti-alias filtering. This rate is maintained across the full −40°C to +125°C operating range.
Does MAX11331ATJ+ support differential input configurations?
Yes, MAX11331ATJ+ supports fully differential, pseudo-differential, and single-ended input configurations on a per-channel basis. It provides 8 fully differential pairs (e.g., AIN0+/AIN0−) or 15 pseudo-differential inputs referenced to REF−/AIN15. Differential mode delivers 70dB SINAD at 100kHz and −88dB crosstalk, making it suitable for noise-sensitive applications like motor current sensing and ECG.
How does the SampleSet™ feature work in MAX11331ATJ+?
SampleSet™ is a user-programmable 256-step channel sequencer in MAX11331ATJ+. Users load a custom sequence into internal RAM via SPI, defining which channels to sample, in what order, and at what intervals. This eliminates continuous MCU polling, reduces system-level interrupt load, and enables mixed-rate acquisition - for example, sampling temperature every 100ms while capturing vibration at 3Msps - all autonomously.
What are the key power management features of MAX11331ATJ+?
MAX11331ATJ+ includes AutoShutdown™ (enters low-power state after conversion), fast wake-up (<2µs), and full shutdown (2µA typical). In normal operation at 3Msps/3V, it consumes 5.1–6.5mA (15.2mW). AutoStandby reduces power to 4.35mW at 2.35V. These modes are controlled via SPI registers and require no external circuitry - ideal for battery-powered edge devices with intermittent sensing needs.
Can MAX11331ATJ+ operate with an external reference voltage?
Yes, MAX11331ATJ+ requires an external differential reference: REF+ (1V to VDD + 50mV) and REF− (−0.3V to +1V). This enables ratiometric measurements, improved PSRR, and compatibility with precision external references like the MAX6126. REF− can also serve as the common input for pseudo-differential configurations. Reference current is 110µA at 3Msps with 2.5V REF+, supporting low-drift buffered reference designs.
MAX11331ATJ+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 32-WFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 3M
- Number of Inputs:
- 8, 15, 16
- Input Type:
- Differential, Pseudo-Differential, Single Ended
- Data Interface:
- SPI, DSP
- Configuration:
- MUX-S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External
- Voltage - Supply, Analog:
- 2.35V ~ 3.6V
- Voltage - Supply, Digital:
- 2.35V ~ 3.6V
- Features:
- PGA
- Operating Temperature:
- -40°C ~ 125°C
- Supplier Device Package:
- 32-TQFN (5x5)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX11331ATJ+ FAQ
1.How can I place an order for MAX11331ATJ+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX11331ATJ+ 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 MAX11331ATJ+ reliable?
The price and inventory of MAX11331ATJ+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX11331ATJ+ is usually 5 days.
3.What payment methods are accepted for MAX11331ATJ+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX11331ATJ+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX11331ATJ+?
MAX11331ATJ+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX11331ATJ+ 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 MAX11331ATJ+?
For technical support, including MAX11331ATJ+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX11331ATJ+ requirements.
6.How does Aetrix verify that MAX11331ATJ+ is sourced from the original manufacturer or authorized distributors?
All MAX11331ATJ+ 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 MAX11331ATJ+ meets industry standards.
7.What is the process for return or replacement of MAX11331ATJ+?
All MAX11331ATJ+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX11331ATJ+, 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 MAX11331ATJ+ part is unused and in its original packaging.
Return procedure for MAX11331ATJ+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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