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Analog Devices Inc./Maxim Integrated MAX11142ATI+
- Part No.:
- MAX11142ATI+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
MAX11142ATI+.pdf
- Description:
- IC ADC 8BIT SAR 28TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:283
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Product details
Overview
MAX11142ATI+ from Maxim Integrated is an 8-bit, 8-channel, 500ksps successive-approximation register (SAR) analog-to-digital converter with external reference support, 1.5MHz full-linear bandwidth, and integrated SampleSet channel sequencer. It operates from 2.35V–3.6V supply, consumes 4.2mW at full speed, and features SPI/QSPI/MICROWIRE-compatible 3-wire serial interface - ideal for battery-powered industrial sensor nodes requiring low-power multichannel acquisition.
For engineers reviewing the MAX11142ATI+ datasheet, MAX11142ATI+ pinout, MAX11142ATI+ application, or MAX11142ATI+ equivalent, this page delivers verified specifications, validated pin functions, confirmed operating modes (internal/external clock, FIFO, averaging), real-world use cases in closed-loop control and portable instrumentation, and two technically documented alternative parts with explicit functional and application-level differences.
Technical Context
The MAX11142ATI+ implements a SAR architecture with dual-clock operation: internal clock mode enables 16-entry FIFO buffering and on-chip averaging to improve SNR, while external clock mode supports SampleSet programmable channel sequencing up to 256 entries. It supports single-ended, fully differential, and pseudo-differential input configurations across all 8 channels, with software-selectable bipolar ranges (±VREF+/2 or ±VREF+).
Its analog front-end includes true differential track-and-hold, 15pF input capacitance (RANGE=0), and ±0.15LSB DNL with no missing codes over –40°C to +125°C. The 3-wire serial interface runs up to 8MHz, directly interfaces with 1.8V/2.5V/3.3V logic, and features EOC signaling only in internal clock mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8-bit - delivers 256 distinct output codes; sufficient for cost-sensitive industrial monitoring where high dynamic range is not required. |
| Sampling Rate | 500ksps - supports real-time capture of signals up to 250kHz (Nyquist-limited), suitable for motor current sensing and vibration analysis. |
| SINAD | 49.6dB typical at 250kHz input - enables ~8.0 effective number of bits (ENOB) in mid-bandwidth applications. |
| Power Dissipation | 4.2mW at 3V/500ksps - extends battery life in portable data loggers; drops to 2.1µW in full shutdown. |
| Input Configuration | 8 single-ended or 4 fully differential channels - allows flexible sensor interfacing without external multiplexers. |
| Reference Support | External differential reference (1V to VDD) - enables precise ratiometric measurements using external precision references like REF5025. |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive and industrial PLC environments. |
Pinout & Package
MAX11142ATI+ is housed in a 28-pin, 5mm × 5mm TQFN package with exposed pad (EP), optimized for thermal performance and PCB space efficiency in compact embedded systems.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN0–AIN7 | Analog Input Channels | 8 configurable inputs supporting single-ended, fully differential (AIN0–AIN1, etc.), or pseudo-differential modes relative to AIN15/REF−. |
| REF+/REF− | Differential Reference Inputs | Accept external reference voltage (1V to VDD); REF− doubles as AIN15 in 16-channel variants but is dedicated REF− in MAX11142ATI+ (8-channel). |
| CS, SCLK, DIN, DOUT | 3-Wire Serial Interface | Standard SPI-compatible signals; DOUT active only when CS is low; no external level shifters needed for 1.8V–3.3V controllers. |
| CNVST | Active-Low Conversion Start | Edge-triggered command initiates conversion sequence; synchronous with internal clock or external SCLK depending on mode. |
| EOC | End-of-Conversion Output | Pulls low to signal valid data ready - functional only in internal clock mode; not used in external clock/SampleSet mode. |
| VDD, OVDD, DGND, GND | Power and Ground Rails | VDD (2.35–3.6V analog supply), OVDD (1.5–3.6V I/O supply), separate DGND and analog GND pins - enable clean digital/analog separation. |
Key Features
| Feature | Design Value |
|---|---|
| SampleSet Channel Sequencer | User-programmable 256-step sequence reduces MCU polling overhead and enables mixed-rate sampling (e.g., slow temp + fast current) without firmware intervention. |
| 16-Entry FIFO Buffer | Allows burst sampling at 500ksps while reading out data at slower host clock rates - decouples acquisition timing from communication latency. |
| Internal Averaging | Configurable oversampling improves SNR by up to 3dB for noisy sensor signals (e.g., thermocouple or strain gauge outputs). |
| AutoShutdown with Fast Wake-up | Enters 2.1µW shutdown state between conversions; wakes in <1µs - critical for duty-cycled wireless sensor nodes. |
| Flexible Input Ranges | Software-selectable unipolar (0 to VREF+) or bipolar (±VREF+/2 or ±VREF+) - accommodates diverse transducer outputs without external op-amp gain stages. |
Applications
| Motor Phase Current Monitoring | Portable Gas Detector Signal Chain |
|---|---|
|
Use Scenario: Real-time sampling of shunt-voltage waveforms across three motor phases in BLDC inverters. IC Role / Device Role / Timing Role: 8-bit ADC digitizes differential current sense signals at 500ksps; uses internal clock + FIFO to absorb PWM noise bursts and deliver clean samples to MCU. Use Value: Enables accurate field-oriented control (FOC) with minimal MCU resource usage - SampleSet sequences AIN0–AIN2 per phase while ignoring unused channels. |
Use Scenario: Battery-powered handheld gas analyzer measuring electrochemical sensor output across multiple gas types. IC Role / Device Role / Timing Role: Configured for 4 single-ended channels (O₂, CO, H₂S, temp), scanning via SampleSet at adaptive rates (100Hz for O₂, 10Hz for temp). Use Value: 4.2mW active power and 2.1µW shutdown extend runtime beyond 24 hours on two AA cells; external reference ensures ppm-level measurement stability. |
| Industrial PLC Analog Input Module | Automotive Cabin Air Quality Sensor Hub |
|
Use Scenario: 8-channel analog input card in DIN-rail mounted PLC acquiring 4–20mA loop signals and thermistor voltages. IC Role / Device Role / Timing Role: Uses pseudo-differential mode relative to common AIN15 to reject shared-mode noise on long sensor cables; internal averaging suppresses 50/60Hz interference. Use Value: –40°C to +125°C rating and ±0.15LSB DNL guarantee accuracy across factory floor temperature swings without recalibration. |
Use Scenario: In-vehicle air quality monitor integrating CO₂, VOC, humidity, and ambient temp sensors. IC Role / Device Role / Timing Role: Interfaces 4 analog sensors via AIN0–AIN3; leverages OVDD = 1.8V compatibility to connect directly to automotive-grade 1.8V microcontroller I/O. Use Value: 5mm × 5mm TQFN footprint fits tight HVAC control board space; 2.35V minimum VDD supports operation during cold-crank battery dips. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit multichannel SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7953IRHBT | 12-bit resolution, 1MSPS, SPI interface, no FIFO or SampleSet; requires external sequencer logic. | Better ENOB for precision sensor calibration; lacks autonomous channel sequencing - increases MCU firmware complexity. | Select when higher resolution outweighs autonomous sequencing needs and host MCU can manage channel timing. |
| AD7476AWYRMZ-REEL | Single-channel, 12-bit, 1MSPS, no internal reference or FIFO; only 6-pin SOT-23 package. | Ultra-small footprint and lower cost per channel, but requires external multiplexer and timing control for multichannel use. | Select for space-constrained single-sensor designs where external mux + GPIO timing is acceptable. |
Compared with ADS7953IRHBT and AD7476AWYRMZ-REEL, MAX11142ATI+ uniquely integrates SampleSet sequencing and FIFO buffering - reducing host processor load and PCB component count in 8-channel systems, while its 8-bit resolution optimizes power and cost for non-precision applications.
Availability
MAX11142ATI+ is available at Aetrix Electronics and suitable for industrial control systems, portable instrumentation, and automotive cabin electronics requiring stable component supply, extended temperature operation, and low-power multichannel data acquisition.
Supply support for MAX11142ATI+ 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 MAX11135–MAX11143 family was engineered to deliver high-speed, low-power, multichannel SAR conversion with autonomous sequencing - targeting battery-operated test equipment and distributed sensor networks where MCU offload and energy efficiency are critical.
FAQ
What is the maximum sampling rate of the MAX11142ATI+?
The MAX11142ATI+ achieves a guaranteed 500ksps conversion rate in both internal and external clock modes. In internal clock mode, conversion time is fixed at 5.9µs; in external clock mode with 8MHz SCLK, it completes in 2000ns per sample. No pipeline delay occurs, ensuring deterministic timing for real-time control loops.
Does the MAX11142ATI+ support differential input configurations?
Yes, the MAX11142ATI+ supports fully differential inputs (e.g., AIN0/AIN1 pair), pseudo-differential inputs (relative to AIN15/REF−), and single-ended inputs across all 8 channels. Differential mode provides 70dB CMRR at 60Hz and rejects common-mode noise in motor drive or industrial sensor environments.
How does the SampleSet feature work on the MAX11142ATI+?
The SampleSet feature allows users to pre-load a custom 256-step channel sequence into internal registers via the SPI interface. Once enabled, the MAX11142ATI+ autonomously cycles through the defined order - eliminating continuous MCU polling and reducing system-level EMI by minimizing digital activity during acquisition.
What reference voltage options are supported by the MAX11142ATI+?
The MAX11142ATI+ requires an external differential reference applied to REF+ (1V to VDD) and REF− (–0.3V to +1V). It does not include an internal reference. This design enables ratiometric accuracy with stable external references like the REF5025 or LM4040, critical for calibrated sensor systems.
Is the MAX11142ATI+ pin-compatible with other devices in the MAX11135–MAX11143 family?
No - the MAX11142ATI+ is an 8-channel variant in a 28-pin TQFN package, sharing pinout with MAX11136ATI+ and MAX11139ATI+, but not with 4-channel (MAX11135ATI+) or 16-channel (MAX11137ATI+) members. Pin functions match exactly within the 8-channel group, enabling direct substitution among those three part numbers.
MAX11142ATI+ 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:
- 8
- Sampling Rate (Per Second):
- 500k
- Number of Inputs:
- 4, 8
- 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:
- -
MAX11142ATI+ FAQ
1.How can I place an order for MAX11142ATI+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX11142ATI+ 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 MAX11142ATI+ reliable?
The price and inventory of MAX11142ATI+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX11142ATI+ is usually 5 days.
3.What payment methods are accepted for MAX11142ATI+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX11142ATI+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX11142ATI+?
MAX11142ATI+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX11142ATI+ 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 MAX11142ATI+?
For technical support, including MAX11142ATI+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX11142ATI+ requirements.
6.How does Aetrix verify that MAX11142ATI+ is sourced from the original manufacturer or authorized distributors?
All MAX11142ATI+ 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 MAX11142ATI+ meets industry standards.
7.What is the process for return or replacement of MAX11142ATI+?
All MAX11142ATI+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX11142ATI+, 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 MAX11142ATI+ part is unused and in its original packaging.
Return procedure for MAX11142ATI+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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