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Analog Devices Inc./Maxim Integrated MAX11120ATI+
- Part No.:
- MAX11120ATI+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
MAX11120ATI+.pdf
- Description:
- IC ADC 8BIT SAR 28TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,253
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Product details
Overview
MAX11120ATI+ from Analog Devices is a 12-bit, 4-channel, 1Msps serial-output SAR ADC with external reference support, 1.5MHz full-linear bandwidth, ±1 LSB INL/DNL, and 70dB SINAD at 250kHz - designed for high-speed portable data acquisition in battery-powered instrumentation.
For engineers reviewing the MAX11120ATI+ datasheet, MAX11120ATI+ pinout, MAX11120ATI+ application, or MAX11120ATI+ equivalent, this page delivers verified specs, real-world use cases, pin-level design meaning, thermal and timing constraints, and validated alternative options for industrial control and medical sensor interfaces.
Technical Context
The MAX11120ATI+ implements a successive-approximation register (SAR) architecture with dual clock modes: internal clock (enabling FIFO buffering and on-chip averaging) and external clock (supporting SampleSet™ programmable channel sequencing). It features true differential track-and-hold with flexible input configuration across all four analog inputs.
Its analog front-end supports unipolar (0 to VREF+) and bipolar (±VREF+/2 or ±VREF+) ranges via software-configurable RANGE bit, while the 16MHz 3-wire SPI-compatible interface operates with independent VOVDD (1.5V–3.6V), enabling direct interfacing with 1.8V/2.5V/3.3V digital systems without level shifters.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete output codes with no missing codes over temperature. |
| Sampling Rate | 1Msps - enables real-time capture of signals up to 500kHz Nyquist frequency. |
| SINAD | 70dB at 250kHz input - ensures ≥11.3 effective bits for precision sensor digitization. |
| Power Dissipation | 5.4mW at 3V/1Msps - supports >10-hour runtime in 100mA-hr coin-cell systems. |
| Full-Shutdown Current | 2μA - reduces standby power to <1μW, critical for wake-on-event architectures. |
| Analog Supply Range | 2.35V to 3.6V - compatible with single Li-ion or dual alkaline supply rails. |
| Input Configuration | Single-ended, pseudo-differential, or fully differential per channel - eliminates need for external signal conditioning in mixed-signal front-ends. |
Pinout & Package
MAX11120ATI+ uses a 28-pin, 5mm × 5mm TQFN-EP package (Package Code T2855+3) with exposed pad connected to GND for thermal and noise performance. Pin count and layout match the 4-channel variant within the MAX11120–MAX11128 family.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN0–AIN3 | Analog Input Channels | Four configurable inputs supporting single-ended, pseudo-diff, or true diff pairs relative to REF−/AIN15. |
| REF+, REF−/AIN15 | Differential Reference Inputs | Accept external 1V–VDD reference; REF− doubles as AIN15 in 16-channel variants but is dedicated REF− in MAX11120ATI+. |
| VDD, DGND, GND, OVDD | Power & Ground Terminals | VDD (2.35–3.6V) powers core logic; OVDD (1.5–3.6V) isolates I/O voltage domain; separate DGND/GND reduce digital noise coupling. |
| CS, SCLK, DIN, DOUT, EOC | 3-Wire SPI Interface | Standard SPI timing with EOC flag (active-low) indicating conversion completion only in internal-clock mode. |
| CNVST/AIN14 | Conversion Start Input | Active-low hardware trigger; in MAX11120ATI+, this pin functions solely as CNVST (not AIN14). |
Key Features
| Feature | Design Value |
|---|---|
| SampleSet™ Channel Sequencing | User-programmable sequence of up to 256 conversions per scan - offloads microcontroller polling in multichannel monitoring. |
| 16-Entry FIFO Buffer | Enables burst sampling at 1Msps while reading out at slower MCU clock rates - decouples acquisition and processing timing. |
| Internal Averaging Mode | Improves SNR by up to 3dB for noisy industrial sensor signals without firmware overhead. |
| Bipolar Input Ranges | Software-selectable ±VREF+/2 or ±VREF+ - supports AC-coupled transducer outputs without external op-amp biasing. |
| AutoShutdown™ | Automatic entry into 2μA shutdown after conversion completes - eliminates manual power-state management in low-duty-cycle apps. |
Applications
| Portable Medical Sensors | Industrial Motor Control Feedback |
|---|---|
Use Scenario: Continuous ECG waveform digitization in handheld patient monitors with 24-hour battery life. IC Role / Device Role / Timing Role: Primary 12-bit ADC capturing lead-II differential signals at 1ksps with internal averaging to suppress 50/60Hz interference. Use Value: 70dB SINAD at 250kHz and 5.4mW power enable clinical-grade fidelity without active cooling or oversized batteries. |
Use Scenario: Real-time current sensing across three motor phases in compact BLDC inverters. IC Role / Device Role / Timing Role: Simultaneous sampling of shunt voltages using pseudo-differential configuration and SampleSet™ sequencing. Use Value: 1.5MHz full-linear bandwidth preserves edge integrity during PWM switching transients; 2μA shutdown extends idle time between commutation cycles. |
| Battery-Powered Test Equipment | Automotive Cabin Environment Monitoring |
Use Scenario: Handheld multimeter with dual-range voltage/current measurement and Bluetooth telemetry. IC Role / Device Role / Timing Role: Configurable 12-bit ADC handling both high-impedance voltage inputs and low-voltage shunt measurements via RANGE bit selection. Use Value: Single-supply 2.35–3.6V operation and 1.8V–3.3V I/O compatibility eliminate level-shifter components in mixed-voltage PCB layouts. |
Use Scenario: Occupant detection system using capacitive and thermistor sensors in automotive HVAC modules. IC Role / Device Role / Timing Role: Low-power 4-channel ADC scanning cabin temperature, humidity, CO₂, and seat occupancy signals every 500ms. Use Value: -40°C to +125°C rating and AEC-Q200-aligned thermal design (θJA = 29°C/W) ensure reliability in under-dash environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7953IRHBT | 12-bit, 16-channel, 1Msps, but requires internal reference and lacks SampleSet™ sequencing. | Better channel density; less flexible for mixed-frequency input scheduling in resource-constrained MCUs. | Select when maximizing channel count outweighs need for autonomous sequencing. |
| AD7476ARTZ-REEL7 | 12-bit, single-channel, 1Msps, no FIFO, no averaging, 3.6V max supply, higher 9.5mW power at 1Msps. | Simpler interface and smaller footprint; unsuitable for multi-sensor synchronization or noise-prone environments. | Select for cost-sensitive, single-input applications where power and feature set are secondary. |
Compared with ADS7953IRHBT and AD7476ARTZ-REEL7, MAX11120ATI+ uniquely combines 4-channel flexibility, SampleSet™ autonomous sequencing, and 2μA shutdown - making it optimal for battery-powered systems requiring coordinated, low-overhead analog monitoring.
Availability
MAX11120ATI+ is available at Aetrix Electronics and suitable for portable medical sensors, industrial motor control feedback, and battery-powered test equipment requiring stable component supply across extended production lifecycles.
Supply support for MAX11120ATI+ 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
Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, serving industrial, automotive, communications, and healthcare markets since 1965.
The MAX11120ATI+ belongs to the MAX11120–MAX11128 family of low-power, high-speed SAR ADCs engineered specifically for space-constrained, battery-operated data acquisition systems demanding precision, autonomy, and thermal robustness.
FAQ
What is the maximum supported external reference voltage for MAX11120ATI+?
The MAX11120ATI+ accepts an external reference voltage from 1V up to VDD + 50mV. With VDD rated up to 3.6V, the practical maximum reference is 3.65V. The device guarantees ±1 LSB INL and 70dB SINAD when VREF+ = VDD at 3V, and reference current draw remains below 37µA at 1Msps - enabling direct use of precision bandgap or LDO outputs without buffering.
Does MAX11120ATI+ support true differential input mode across all four channels?
Yes, MAX11120ATI+ supports true differential input mode using AIN0–AIN3 as two fully differential pairs (e.g., AIN0/AIN1 and AIN2/AIN3), with common-mode range extending from GND to VDD and differential range of ±VREF+/2 or ±VREF+. This is confirmed in the "Analog Multiplexer" feature list and electrical characteristics tables, and does not require external resistors or amplifiers.
How does the SampleSet™ feature function in MAX11120ATI+ given its 4-channel configuration?
In MAX11120ATI+, SampleSet™ allows programming of a custom 4-channel conversion sequence (e.g., AIN0 → AIN2 → AIN1 → AIN3) with up to 256 entries per scan. The sequencer executes autonomously after initialization, reducing host MCU intervention and bus traffic - particularly valuable in low-power sleep-wake architectures where the controller remains dormant between bursts.
What is the thermal resistance (θJA) of the MAX11120ATI+ TQFN package under JEDEC 4-layer board conditions?
The MAX11120ATI+ TQFN-EP package (T2855+3) has a junction-to-ambient thermal resistance (θJA) of 29°C/W when mounted on a JEDEC-standard 4-layer board. This value is measured with the exposed pad soldered directly to a solid GND plane, ensuring reliable operation at full 1Msps throughput even at +125°C ambient - critical for under-hood or enclosed industrial enclosures.
Can MAX11120ATI+ operate with separate analog and digital I/O supplies?
Yes, MAX11120ATI+ supports independent analog (VDD: 2.35–3.6V) and digital I/O (OVDD: 1.5–3.6V) supplies. This allows direct interfacing with 1.8V FPGAs or 2.5V microcontrollers without level shifters, while maintaining full 12-bit accuracy and timing compliance - verified across all specified OVDD ranges in the Electrical Characteristics table.
MAX11120ATI+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 28-WFQFN Exposed Pad
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Number of Bits:
- 8
- Sampling Rate (Per Second):
- 1M
- Number of Inputs:
- 2, 4
- 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:
- -
MAX11120ATI+ FAQ
1.How can I place an order for MAX11120ATI+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX11120ATI+ 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 MAX11120ATI+ reliable?
The price and inventory of MAX11120ATI+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX11120ATI+ is usually 5 days.
3.What payment methods are accepted for MAX11120ATI+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX11120ATI+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX11120ATI+?
MAX11120ATI+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX11120ATI+ 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 MAX11120ATI+?
For technical support, including MAX11120ATI+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX11120ATI+ requirements.
6.How does Aetrix verify that MAX11120ATI+ is sourced from the original manufacturer or authorized distributors?
All MAX11120ATI+ 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 MAX11120ATI+ meets industry standards.
7.What is the process for return or replacement of MAX11120ATI+?
All MAX11120ATI+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX11120ATI+, 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 MAX11120ATI+ part is unused and in its original packaging.
Return procedure for MAX11120ATI+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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