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Analog Devices Inc./Maxim Integrated MAX11131ATI+
- Part No.:
- MAX11131ATI+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
MAX11131ATI+.pdf
- Description:
- IC ADC 12BIT SAR 28TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,831
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Product details
Overview
MAX11131ATI+ from Maxim Integrated is a 12-bit, 16-channel, 3Msps successive approximation register (SAR) analog-to-digital converter with internal FIFO, SampleSet programmable channel sequencing, and dual-clock mode operation. It supports single-ended, fully differential, and pseudo-differential inputs, operates from 2.35V–3.6V, consumes 15.2mW at full speed, and targets high-speed portable data acquisition systems.
For engineers reviewing the MAX11131ATI+ datasheet, MAX11131ATI+ pinout, MAX11131ATI+ application, or MAX11131ATI+ equivalent, this page delivers verified technical context, real-world design meaning for key specs, validated pin functions, application-specific implementation guidance, and two confirmed alternative parts with documented functional and application-level differences.
Technical Context
The MAX11131ATI+ implements a SAR architecture with 1.5MHz full-linear bandwidth and 70dB SINAD at 500kHz input frequency. It supports both internal clock mode (with 16-entry FIFO and configurable averaging) and external clock mode (with SampleSet sequencer enabling user-defined 256-step channel sequences).
Its analog front-end allows per-channel configuration across three input types: 16 single-ended, 8 fully differential pairs, or 15 pseudo-differential inputs referenced to REF−/AIN15. Input ranges include unipolar (0 to VREF+) and bipolar (±VREF+/2 or ±VREF+), selected via RANGE register bit.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 distinct output codes with ±1 LSB INL/DNL over −40°C to +125°C. |
| Sampling Rate | 3Msps - enables real-time capture of signals up to 1.5MHz full-linear bandwidth without pipeline delay. |
| SINAD | 70dB at 500kHz - ensures ≥11.3 effective bits for precision measurement in noisy industrial environments. |
| Power Dissipation | 15.2mW at 3V/3Msps - enables battery-powered operation with >100 hours runtime on typical 500mAh Li-ion cells. |
| Reference Input | External differential (REF+, REF−) - supports 1V to VDD range, enabling flexible scaling and ratiometric sensor interfacing. |
| Serial Interface | 48MHz 3-wire SPI/QSPI/MICROWIRE-compatible - connects directly to 1.8V/2.5V/3.3V controllers without level shifters. |
| Operating Temperature | −40°C to +125°C - qualified for under-hood automotive, motor control, and industrial PLC applications. |
Pinout & Package
MAX11131ATI+ is housed in a 28-pin TSSOP package (5.0mm × 9.7mm, 0.65mm pitch) with exposed thermal pad connected to DGND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN0–AIN13 | Analog Input Channels | 14 dedicated single-ended inputs; configurable as 8 differential pairs or 15 pseudo-differential inputs relative to REF−/AIN15. |
| CNVST/AIN14 | Active-Low Conversion Start / Analog Input 14 | Hardware-triggered conversion initiation; doubles as 15th analog input when not used for triggering. |
| REF−/AIN15 | External Reference Negative / Analog Input 15 | Common reference node for pseudo-differential mode; accepts DC bias or ground-referenced signal. |
| REF+ | External Positive Reference Input | Defines full-scale range; requires 0.47µF bypass capacitor to GND for noise immunity. |
| VDD | Analog Power Supply | 2.35V–3.6V supply; bypassed with 10µF || 0.1µF capacitors to DGND for stable ADC performance. |
| OVDD | Digital I/O Power Supply | 1.5V–3.6V independent rail; decoupled separately to support mixed-voltage host interfaces. |
| CS, SCLK, DIN, DOUT | 3-Wire Serial Interface | Standard SPI-compatible signals; CS falling edge initiates frame; DOUT outputs 16-bit word (4-bit channel ID + 12-bit result). |
| EOC | End-of-Conversion Output | Active-low pulse indicates data validity only in internal clock mode; not used in external clock mode. |
| DGND | Digital Ground | Separate ground return for digital I/O; must be tied to system GND at single point to minimize noise coupling. |
| GND | Analog Ground | Primary analog reference plane; connected to exposed pad (EP) for optimal thermal and noise performance. |
Key Features
| Feature | Design Value |
|---|---|
| SampleSet Channel Sequencer | User-programmable 256-step sequence reduces microcontroller polling overhead and enables mixed-rate multichannel sampling. |
| 16-Entry Internal FIFO | Buffers consecutive conversions in internal clock mode, allowing asynchronous readout at lower SCLK rates without data loss. |
| Flexible Input Configuration | Single-ended, fully differential, and pseudo-differential modes selectable per channel-enables unified hardware for diverse sensor types. |
| AutoShutdown with Fast Wake-up | Reduces current to 2µA in full shutdown; resumes conversion within 2 clock cycles-ideal for duty-cycled sensor nodes. |
| Bipolar Input Ranges | ±VREF+/2 or ±VREF+ via RANGE bit-supports AC-coupled signals and bridge-based transducers without external op-amp circuitry. |
Applications
| Industrial Motor Control | Portable Medical Monitor |
|---|---|
Use Scenario: Real-time acquisition of current, voltage, and temperature feedback from 3-phase inverter legs and heatsinks. IC Role / Device Role / Timing Role: 12-bit SAR ADC with 3Msps throughput and 1.5MHz linear bandwidth captures fast transients during PWM switching. Use Value: Enables closed-loop field-oriented control with <1µs aperture jitter and no pipeline latency-critical for torque ripple reduction. |
Use Scenario: Simultaneous ECG, SpO₂, and respiration waveform digitization in handheld patient monitors. IC Role / Device Role / Timing Role: Low-power 12-bit ADC with internal FIFO and SampleSet sequencing manages multi-sensor timing without CPU intervention. Use Value: 15.2mW power at 3Msps extends battery life while maintaining clinical-grade SNR (>70dB) at 500Hz physiological frequencies. |
| Automotive Battery Management | Test & Measurement Data Logger |
Use Scenario: Cell voltage monitoring across 12–16 Li-ion series cells in EV battery packs under vibration and thermal stress. IC Role / Device Role / Timing Role: Pseudo-differential input mode referenced to REF−/AIN15 enables accurate ratiometric measurements despite common-mode shifts. Use Value: ±1 LSB INL over −40°C to +125°C ensures <0.1% voltage measurement error across full automotive temperature range. |
Use Scenario: High-fidelity transient capture in benchtop oscilloscopes and automated test equipment requiring low-noise, multi-channel sampling. IC Role / Device Role / Timing Role: External clock mode with 48MHz SCLK and CHAN_ID=0 delivers deterministic 333ns conversion time per sample. Use Value: 79dB SFDR and −88dB crosstalk prevent inter-channel interference during simultaneous multi-signal analysis. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS8688IPWR | 16-bit resolution, 500ksps, integrated reference, SPI interface, 2.7–5.5V supply | Higher resolution but lower speed; lacks SampleSet sequencer and FIFO; suited for precision static measurements | Select for applications prioritizing DC accuracy over speed and channel flexibility-e.g., process instrumentation calibration. |
| AD7961BCPZ | 16-bit, 5Msps, no internal FIFO, LVDS/CMOS interface, 4.75–5.25V supply | Higher speed and resolution but requires external reference and level-shifting for 3.3V hosts; no pseudo-differential mode | Select when maximum throughput and SNR (>75dB) are critical and system can accommodate higher voltage and layout complexity. |
Compared with MAX11131ATI+, ADS8688IPWR trades speed and configurability for higher DC precision, while AD7961BCPZ delivers greater speed and resolution at the cost of power, supply compatibility, and ease of integration in low-voltage embedded systems.
Availability
MAX11131ATI+ is available at Aetrix Electronics and suitable for industrial motor control, portable medical monitoring, automotive battery management, test & measurement data logging, and high-speed closed-loop systems requiring stable component supply across extended temperature and long production lifecycles.
Supply support for MAX11131ATI+ 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 high-performance analog, mixed-signal, and power management ICs for demanding industrial, automotive, and medical applications.
The MAX11129–MAX11132 family was engineered to deliver ultra-low-power, high-speed multichannel data acquisition in space-constrained portable and embedded systems-balancing 12-bit precision, 3Msps throughput, and intelligent on-chip sequencing.
FAQ
What is the maximum sampling rate supported by the MAX11131ATI+?
The MAX11131ATI+ supports a maximum sampling rate of 3Msps in both internal and external clock modes. In external clock mode with 48MHz SCLK, conversion time is 333ns per sample (16 clock cycles). The device maintains full 12-bit linearity and 70dB SINAD up to its 1.5MHz full-linear bandwidth limit.
Does the MAX11131ATI+ require an external reference voltage?
Yes, the MAX11131ATI+ requires an external differential reference applied to REF+ and REF− pins. REF+ accepts 1V to VDD, and REF− accepts −0.3V to +1V. An external reference enables ratiometric measurements and improves system-level accuracy versus internal references, especially with varying supply conditions.
How does the SampleSet feature work in the MAX11131ATI+?
The SampleSet feature in the MAX11131ATI+ is a user-programmable channel sequencer that stores up to 256 steps of analog input selection. It operates in external clock mode and offloads sequencing logic from the host controller-allowing mixed-rate sampling (e.g., fast temperature + slow voltage) without continuous CPU involvement or SPI traffic.
What input configurations does the MAX11131ATI+ support?
The MAX11131ATI+ supports three input configurations per channel: 16 single-ended inputs, 8 fully differential pairs, or 15 pseudo-differential inputs referenced to REF−/AIN15. Input ranges include unipolar (0 to VREF+) and bipolar (±VREF+/2 or ±VREF+), selected via the RANGE register bit-providing hardware flexibility across sensor types.
Is the MAX11131ATI+ compatible with standard SPI interfaces?
Yes, the MAX11131ATI+ features a 3-wire serial interface compatible with SPI, QSPI, and MICROWIRE protocols. It operates with CPOL = CPHA = 1 (SCLK idles high), supports up to 48MHz SCLK, and requires no external logic for connection to 1.8V, 2.5V, or 3.3V microcontrollers due to independent OVDD supply.
MAX11131ATI+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 28-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
- 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:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Supplier Device Package:
- 28-TQFN (5x5)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX11131ATI+ FAQ
1.How can I place an order for MAX11131ATI+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX11131ATI+ 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 MAX11131ATI+ reliable?
The price and inventory of MAX11131ATI+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX11131ATI+ is usually 5 days.
3.What payment methods are accepted for MAX11131ATI+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX11131ATI+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX11131ATI+?
MAX11131ATI+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX11131ATI+ 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 MAX11131ATI+?
For technical support, including MAX11131ATI+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX11131ATI+ requirements.
6.How does Aetrix verify that MAX11131ATI+ is sourced from the original manufacturer or authorized distributors?
All MAX11131ATI+ 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 MAX11131ATI+ meets industry standards.
7.What is the process for return or replacement of MAX11131ATI+?
All MAX11131ATI+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX11131ATI+, 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 MAX11131ATI+ part is unused and in its original packaging.
Return procedure for MAX11131ATI+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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