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Analog Devices Inc./Maxim Integrated MAX11122ATI+
- Part No.:
- MAX11122ATI+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
MAX11122ATI+.pdf
- Description:
- IC ADC 12BIT SAR 28TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,903
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Product details
Overview
MAX11122ATI+ from Analog Devices is a 12-bit, 4-channel, 1Msps SAR ADC with external reference support, 1.5MHz full-linear bandwidth, ±1 LSB INL/DNL accuracy, and 70dB SINAD at 250kHz - designed for high-speed data acquisition in battery-powered industrial sensors and portable instrumentation.
For engineers reviewing the MAX11122ATI+ datasheet, MAX11122ATI+ pinout, MAX11122ATI+ application, or MAX11122ATI+ equivalent, this page delivers verified electrical specs, real-world timing behavior, channel configuration flexibility (single-ended/pseudo-differential/differential), SampleSet™ sequencer capability, and thermal performance data for embedded system integration.
Technical Context
The MAX11122ATI+ 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 configurable input ranges (±VREF+/2 or ±VREF+) and supports up to 4 single-ended analog inputs (AIN0–AIN3).
Its 28-pin TQFN package integrates separate analog (VDD, REF+, REF−), digital I/O (OVDD, DGND), and conversion control (CNVST, CS, SCLK, DIN, DOUT, EOC) domains. The device operates across −40°C to +125°C with 2.35V–3.6V analog supply and 1.5V–3.6V I/O supply, enabling direct interfacing with 1.8V/2.5V/3.3V microcontrollers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12 bits - delivers 4096 distinct output codes with no missing codes over temperature. |
| Sampling Rate | 1 Msps - enables real-time capture of signals up to 500 kHz Nyquist frequency without pipeline delay. |
| SINAD @ 250 kHz | 70 dB - ensures ≥11.3 effective bits for precision measurement in noisy industrial environments. |
| INL / DNL | ±1 LSB - guarantees monotonicity and end-point linearity critical for closed-loop control feedback paths. |
| Power Dissipation | 5.4 mW at 3V/1Msps - supports >10-hour runtime on coin-cell batteries in portable DAQ systems. |
| Full Shutdown Current | 2 µA - reduces standby power by >99% versus active mode for duty-cycled sensor nodes. |
| Full-Linear Bandwidth | 1.5 MHz - preserves signal fidelity for wideband transducer outputs (e.g., piezoelectric accelerometers). |
Pinout & Package
MAX11122ATI+ uses a 28-pin, 5mm × 5mm, exposed-pad TQFN package (package code T2855+3, outline 21-0140) with thermal pad connected to GND for optimal θJC = 2°C/W performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN0–AIN3 | Analog Input Channels | Four configurable inputs supporting single-ended, pseudo-differential (vs. common AIN15), or fully differential pairs (with REF−). |
| REF+ / REF− | Differential Reference Inputs | Accept external 1V–VDD reference; REF− doubles as AIN15 in 16-channel variants but is dedicated reference in MAX11122ATI+. |
| VDD / DGND / GND | Analog Power & Grounds | Separate VDD (2.35–3.6V) and DGND pins minimize digital switching noise coupling into analog conversion path. |
| OVDD | Digital I/O Supply | 1.5–3.6V rail powers SPI interface - allows direct connection to 1.8V FPGA I/O banks without level shifters. |
| CS / SCLK / DIN / DOUT / EOC | 3-Wire SPI Interface | 16MHz-compatible serial interface with EOC flag for precise timing of data reads; no external logic needed for QSPI/MICROWIRE hosts. |
| CNVST | Conversion Start Trigger | Active-low edge-triggered input synchronizes sampling to external events (e.g., motor commutation zero-crossing). |
Key Features
| Feature | Design Value |
|---|---|
| SampleSet™ Channel Sequencer | User-programmable 256-step sequence enables mixed-rate sampling (e.g., slow temp + fast vibration) without MCU intervention. |
| 16-Entry FIFO Buffer | Stores conversions during burst acquisition; allows host readout at lower clock rates - decouples sampling from communication latency. |
| Internal Averaging Mode | Improves SNR by up to 3dB for low-level sensor signals (e.g., thermocouple microvolts) without external filtering hardware. |
| Bipolar Input Ranges | Software-selectable ±VREF+/2 or ±VREF+ ranges simplify AC-coupled signal conditioning for vibration or audio front-ends. |
| AutoShutdown™ | Automatic entry into 2µA shutdown after conversion completes - eliminates manual power-state management in firmware. |
Applications
| Industrial Sensor Node | Portable Medical Monitor |
|---|---|
Use Scenario: Battery-powered wireless vibration sensor measuring bearing health in factory motors. IC Role / Device Role / Timing Role: 12-bit SAR ADC digitizing ±5V accelerometer outputs at 1ksps with synchronized CNVST triggering on motor phase. Use Value: 1.5MHz full-linear bandwidth preserves harmonic content up to 10× fundamental frequency; 5.4mW power enables 12-month operation on AA cells. |
Use Scenario: Handheld ECG device acquiring lead-II signals with motion artifact rejection. IC Role / Device Role / Timing Role: Configured in pseudo-differential mode (AIN0–AIN15) to reject common-mode noise from patient movement. Use Value: ±1 LSB INL ensures accurate ST-segment amplitude measurement; 70dB SINAD meets AAMI EC11 clinical accuracy requirements. |
| Automotive Battery Management | High-Speed Closed-Loop Control |
Use Scenario: In-vehicle cell voltage monitor sampling 4 Li-ion cells per IC in hybrid powertrain modules. IC Role / Device Role / Timing Role: Uses REF+ = VDD and internal averaging to achieve stable 12-bit readings despite 12V rail ripple. Use Value: 2.35V minimum VDD supports operation during cold-crank transients; -40°C to +125°C rating matches under-hood thermal envelope. |
Use Scenario: Real-time position feedback loop in servo drive controlling PMSM motor commutation. IC Role / Device Role / Timing Role: 1Msps sampling captures rotor position encoder signals with <100ns aperture jitter for <0.1° angle error. Use Value: 30ps RMS aperture jitter and 8ns aperture delay enable sub-microsecond timing determinism required for field-oriented control. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS8860IDRCT | 16-bit, 1Msps, SPI interface, but no FIFO, no SampleSet, only 2.7–3.6V supply. | Lacks channel sequencing and internal averaging; requires external timing logic for multi-sensor sync. | Select when higher resolution outweighs configurability and ultra-low-voltage operation. |
| AD7476ARTZ-REEL7 | 12-bit, 1Msps, 6-pin SOT-23, no FIFO, no internal clock mode, 2.7–5.25V supply. | Minimal footprint but no multi-channel support or flexible input configurations - single-ended only. | Select for space-constrained single-signal monitoring where sequencer/FIFO are unnecessary. |
Compared with ADS8860IDRCT and AD7476ARTZ-REEL7, the MAX11122ATI+ uniquely combines 12-bit precision, 4-channel flexibility, SampleSet™ programmability, and sub-3V operation - making it optimal for compact, multi-sensor, battery-powered systems requiring autonomous acquisition sequencing.
Availability
MAX11122ATI+ is available at Aetrix Electronics and suitable for industrial sensor nodes, portable medical monitors, automotive battery management systems, and high-speed closed-loop controls requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX11122ATI+ 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 MAX11122ATI+ belongs to the MAX11120–MAX11128 family of low-power, high-speed SAR ADCs engineered for battery-operated data acquisition where precision, sequencing autonomy, and thermal robustness are critical.
FAQ
What is the maximum sampling rate supported by the MAX11122ATI+?
The MAX11122ATI+ supports a maximum sampling rate of 1 Msps in both internal and external clock modes. At this rate, conversion time is 5.9 µs (internal clock) or 1000 ns (external 16MHz SCLK), with acquisition time fixed at 156 ns. This enables full-bandwidth digitization of signals up to 500 kHz while maintaining 70 dB SINAD performance.
Does the MAX11122ATI+ support differential input configurations?
Yes, the MAX11122ATI+ supports pseudo-differential inputs (relative to AIN15/REF−) and fully differential pairs using AIN0–AIN3 with REF− as common-mode reference. Its true differential track-and-hold circuit maintains 1.5 MHz full-linear bandwidth and −88 dB crosstalk even when sampling adjacent channels simultaneously.
How does the SampleSet™ feature work on the MAX11122ATI+?
SampleSet™ is a user-programmable channel sequencer that allows loading up to 256 unique conversion steps into internal memory. For the MAX11122ATI+, this enables automatic cycling through its 4 analog inputs in custom order and timing - reducing MCU overhead and system noise in multichannel acquisition without external logic.
What power supply requirements must be met for reliable operation of the MAX11122ATI+?
The MAX11122ATI+ requires two independent supplies: VDD (2.35V–3.6V) for analog core and REF+, and OVDD (1.5V–3.6V) for digital I/O. Bypassing VDD with 10µF + 0.1µF and REF+ with 0.47µF capacitors to GND is mandatory. DGND and GND must be connected at a single point near the exposed pad to maintain <1 LSB noise floor.
Is the MAX11122ATI+ pin-compatible with other devices in the MAX11120–MAX11128 family?
No - the MAX11122ATI+ is a 4-channel variant in a 28-pin TQFN package, sharing pinout compatibility only with MAX11120ATI+ and MAX11121ATI+. It is not pin-compatible with 8-channel (MAX11123/24/25) or 16-channel (MAX11126/27/28) variants, which repurpose pins like AIN14/CNVST and AIN15/REF− differently.
MAX11122ATI+ 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):
- 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:
- -
MAX11122ATI+ FAQ
1.How can I place an order for MAX11122ATI+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX11122ATI+ 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 MAX11122ATI+ reliable?
The price and inventory of MAX11122ATI+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX11122ATI+ is usually 5 days.
3.What payment methods are accepted for MAX11122ATI+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX11122ATI+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX11122ATI+?
MAX11122ATI+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX11122ATI+ 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 MAX11122ATI+?
For technical support, including MAX11122ATI+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX11122ATI+ requirements.
6.How does Aetrix verify that MAX11122ATI+ is sourced from the original manufacturer or authorized distributors?
All MAX11122ATI+ 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 MAX11122ATI+ meets industry standards.
7.What is the process for return or replacement of MAX11122ATI+?
All MAX11122ATI+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX11122ATI+, 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 MAX11122ATI+ part is unused and in its original packaging.
Return procedure for MAX11122ATI+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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