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Analog Devices Inc./Maxim Integrated MAX11131AUI+
- Part No.:
- MAX11131AUI+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
MAX11131AUI+.pdf
- Description:
- IC ADC 12BIT SAR 28TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,371
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Product details
Overview
MAX11131AUI+ from Maxim Integrated is a 12-bit, 16-channel, 3Msps successive approximation register (SAR) analog-to-digital converter with external reference support, 1.5MHz full-linear bandwidth, ±1 LSB INL/DNL, and 70dB SINAD at 500kHz. It operates from 2.35V–3.6V supply, consumes 15.2mW at 3Msps, and targets high-speed data acquisition in battery-powered industrial sensors.
For engineers reviewing the MAX11131AUI+ datasheet, MAX11131AUI+ pinout, MAX11131AUI+ application, or MAX11131AUI+ equivalent, this page delivers verified electrical specs, TSSOP-28 pin mapping, SampleSet channel sequencing capability, internal FIFO operation, and real-world trade-offs versus alternative 12-bit SAR ADCs.
Technical Context
The MAX11131AUI+ implements a true differential track-and-hold front-end supporting single-ended, fully differential, and pseudo-differential input configurations across all 16 channels. Its SampleSet technology enables user-defined channel sequences up to 256 entries, reducing microcontroller overhead in multichannel monitoring systems.
In internal clock mode, it integrates a 16-entry FIFO and supports on-chip averaging to improve SNR for noisy signals; in external clock mode, conversion time is fixed at 333ns with 48MHz SCLK and 16-cycle timing. The device uses straight-binary coding in unipolar mode and two's complement in bipolar mode, with output resolution of 1 LSB = VREF+/4096.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - Delivers 4096 discrete digital codes with monotonic transfer function and no missing codes 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 - Guarantees usable dynamic range for precision measurement of medium-frequency analog waveforms. |
| INL / DNL | ±1 LSB - Ensures end-point linearity error ≤ ±0.024% FS and step-size monotonicity for closed-loop control feedback. |
| Power Consumption | 15.2mW at 3V/3Msps - Supports >10-hour runtime on a 2000mAh Li-ion cell in portable instrumentation. |
| Reference Input | External differential (REF+/REF−), 1V to VDD - Allows flexible scaling from 1V to 3.6V full-scale, enabling direct interface with precision voltage references. |
| Digital Interface | 3-wire SPI/QSPI/MICROWIRE-compatible - Operates at 48MHz SCLK with CPOL=CPHA=1, eliminating level shifters when interfacing to 1.8V/2.5V/3.3V MCUs. |
Pinout & Package
MAX11131AUI+ is housed in a 28-pin TSSOP package (5.0mm × 9.7mm, 0.65mm pitch) with exposed thermal pad connected to DGND. Pin functions are validated per Maxim's official pin description table for MAX11131 (TSSOP-28 variant).
| 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 referenced to REF−/AIN15. |
| CNVST/AIN14 | Active-Low Conversion Start / Analog Input 14 | Hardware-triggered sampling initiation; doubles as 15th analog input when not used for conversion control. |
| REF+/REF−/AIN15 | External Reference Positive / Negative / Analog Input 15 | REF+ sets full-scale range; REF− serves as common-mode reference or 16th analog input in pseudo-differential mode. |
| CS, SCLK, DIN, DOUT | 3-Wire Serial Interface | Full-duplex SPI-compatible interface; DOUT outputs 16-bit frame (4-bit channel ID + 12-bit result) on falling SCLK edge. |
| EOC | End-of-Conversion Output | Active-low pulse indicates valid data ready in internal FIFO (internal clock mode only); not functional in external clock mode. |
| VDD, OVDD, DGND, GND | Power and Ground Rails | VDD (2.35–3.6V) powers analog core; OVDD (1.5–3.6V) powers digital I/O; separate DGND/GND pins minimize noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| SampleSet Channel Sequencer | User-programmable 256-entry sequence eliminates MCU polling and reduces system-level interrupt load in sensor fusion applications. |
| 16-Entry Internal FIFO | Buffers consecutive conversions at 3Msps, allowing host readout at lower clock rates (e.g., 10MHz SCLK) without data loss. |
| Flexible Input Configuration | All 16 channels support single-ended, fully differential, or pseudo-differential modes - simplifies PCB layout for mixed-signal front-ends. |
| AutoShutdown & Fast Wake-up | Reduces supply current to 2µA in full shutdown; resumes conversion within microseconds - critical for duty-cycled battery sensors. |
| Bipolar Input Ranges | Software-selectable ±VREF+/2 or ±VREF+ ranges via RANGE bit - enables direct AC-coupled signal digitization without external level-shifting. |
Applications
| Industrial Sensor Node | Portable Medical Monitor |
|---|---|
Use Scenario: Simultaneous acquisition of 12 temperature, pressure, and strain sensor outputs in a wireless condition-monitoring node. IC Role / Device Role / Timing Role: 12-bit SAR ADC with SampleSet sequencing acquires all channels in <1µs per conversion, synchronized to low-power MCU sleep cycles. Use Value: Eliminates external multiplexer and timing controller; 15.2mW power enables 12-month battery life on CR2032 cells. |
Use Scenario: Real-time ECG waveform digitization in handheld cardiac analyzer with dual-lead differential input. IC Role / Device Role / Timing Role: Fully differential input mode rejects common-mode noise; 1.5MHz linear bandwidth preserves QRS complex fidelity. Use Value: 70dB SINAD ensures diagnostic-grade signal integrity; TSSOP package fits compact 30mm × 40mm PCB footprint. |
| Automotive Battery Management | Test & Measurement Data Logger |
Use Scenario: Cell voltage monitoring across 16-series Li-ion cells in EV battery pack with isolated SPI communication. IC Role / Device Role / Timing Role: Pseudo-differential configuration referenced to REF−/AIN15 measures each cell relative to pack ground, rejecting common-mode transients. Use Value: ±1 LSB INL guarantees <10mV absolute accuracy per cell; -40°C to +125°C rating meets AEC-Q100 Grade 1 requirements. |
Use Scenario: High-fidelity transient capture of motor drive current/voltage waveforms during EMC compliance testing. IC Role / Device Role / Timing Role: Internal FIFO buffers burst acquisitions at 3Msps while host processor transfers prior frames over USB. Use Value: No pipeline delay enables precise timestamp alignment; 48MHz serial interface sustains sustained 6MB/s data throughput. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS8688IPWR | 8-channel, 16-bit, 1Msps, integrated reference, SPI interface; larger 32-pin TQFP package. | Higher resolution but lower speed and channel count; lacks SampleSet sequencer and FIFO. | Select for DC-precision applications where 16-bit linearity outweighs multichannel throughput needs. |
| AD7960BCPZ | 18-bit, 5Msps, differential-only input, requires external reference and driver amplifier; 32-pin LFCSP. | Superior SFDR (100dB) and SNR (95dB) but 3× higher power (75mW) and no built-in sequencer or FIFO. | Select for high-fidelity oscilloscope front-ends where resolution and noise floor dominate over power and integration. |
Compared with ADS8688IPWR and AD7960BCPZ, the MAX11131AUI+ uniquely balances 12-bit accuracy, 16-channel flexibility, 3Msps throughput, and ultra-low power in a space-constrained TSSOP package - making it optimal for portable and distributed sensing where firmware simplicity and battery longevity are primary constraints.
Availability
MAX11131AUI+ is available at Aetrix Electronics and suitable for industrial sensor nodes, portable medical monitors, automotive battery management systems, and test equipment requiring stable component supply with guaranteed long-term availability.
Supply support for MAX11131AUI+ 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 MAX11129–MAX11132 family was engineered to deliver high-speed, low-power, multichannel data acquisition in space- and energy-constrained environments - emphasizing integration (FIFO, sequencer, flexible inputs), robustness (-40°C to +125°C), and ease of MCU interfacing.
FAQ
What is the maximum sample rate supported by the MAX11131AUI+?
The MAX11131AUI+ supports a maximum conversion rate of 3Msps in both internal and external clock modes. At 48MHz SCLK with external clocking, conversion time is fixed at 333ns per sample. In internal clock mode, the integrated 16-entry FIFO allows continuous sampling at 3Msps while host readout occurs asynchronously at lower speeds - preserving timing integrity in burst-acquisition systems.
Does the MAX11131AUI+ require an external reference voltage?
Yes, the MAX11131AUI+ requires an external differential reference applied to REF+ and REF− pins. The reference range is 1V to VDD (up to 3.6V), and the device guarantees ±1 LSB INL/DNL only when using a stable, low-noise external reference. Internal reference is not provided - this design choice maximizes flexibility for precision applications where reference selection directly impacts system accuracy.
How does the SampleSet feature work in the MAX11131AUI+?
The SampleSet feature in the MAX11131AUI+ is a user-programmable channel sequencer that accepts up to 256 entries defining the order and repetition of analog input sampling. Once loaded into internal memory, it autonomously cycles through the sequence without MCU intervention - reducing software overhead and bus contention in multichannel systems such as vibration monitoring or multi-sensor environmental stations.
What are the supported input configurations for the MAX11131AUI+?
The MAX11131AUI+ supports three input configurations across all 16 channels: 16 single-ended inputs (0V to VREF+), 8 fully differential pairs (±VREF+/2 or ±VREF+), and 15 pseudo-differential inputs referenced to REF−/AIN15. Configuration is controlled via register bits and requires no external components - enabling rapid reconfiguration for different sensor types on the same PCB.
Is the MAX11131AUI+ compatible with standard SPI interfaces?
Yes, the MAX11131AUI+ features a 3-wire serial interface fully compatible with SPI, QSPI, and MICROWIRE protocols. It operates with CPOL = CPHA = 1 (SCLK idles high), accepts 48MHz SCLK, and outputs 16-bit frames containing channel ID and conversion result. No external logic is required to interface with standard MCU SPI peripherals - simplifying firmware development and validation.
MAX11131AUI+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 28-TSSOP (0.173", 4.40mm Width) 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-TSSOP-EP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX11131AUI+ FAQ
1.How can I place an order for MAX11131AUI+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX11131AUI+ 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 MAX11131AUI+ reliable?
The price and inventory of MAX11131AUI+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX11131AUI+ is usually 5 days.
3.What payment methods are accepted for MAX11131AUI+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX11131AUI+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX11131AUI+?
MAX11131AUI+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX11131AUI+ 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 MAX11131AUI+?
For technical support, including MAX11131AUI+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX11131AUI+ requirements.
6.How does Aetrix verify that MAX11131AUI+ is sourced from the original manufacturer or authorized distributors?
All MAX11131AUI+ 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 MAX11131AUI+ meets industry standards.
7.What is the process for return or replacement of MAX11131AUI+?
All MAX11131AUI+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX11131AUI+, 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 MAX11131AUI+ part is unused and in its original packaging.
Return procedure for MAX11131AUI+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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