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Analog Devices Inc./Maxim Integrated MAX11111ATB+T
- Part No.:
- MAX11111ATB+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
MAX11111ATB+T.pdf
- Description:
- IC ADC 8BIT SAR 10TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,504
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Product details
Overview
MAX11111ATB+T from Maxim Integrated is an 8-bit, dual-channel, single-ended successive approximation ADC with 3Msps throughput, 73dB SNR (typ), and external reference input. It operates from 2.2V–3.6V supply, consumes 5.2mW at full speed, and features SPI/QSPI/MICROWIRE-compatible 3-wire serial interface - ideal for high-density battery-powered data acquisition in portable medical and industrial edge sensors.
For engineers reviewing the MAX11111ATB+T datasheet, MAX11111ATB+T pinout, MAX11111ATB+T application, or MAX11111ATB+T equivalent, this page delivers verified electrical specs, package mapping to 10-pin TDFN-EP (3mm × 3mm), functional role in dual-input signal digitization, and two validated alternative parts with documented parameter and interface differences.
Technical Context
The MAX11111ATB+T implements a high-dynamic-range sample-and-hold front-end paired with a SAR core optimized for low-latency conversion without pipeline delay. Its dual 2:1 analog MUX enables time-multiplexed sampling of two independent single-ended signals (AIN1/AIN2) into one ADC core, supporting synchronized channel switching under CS control.
It supports variable I/O voltage (1.5V–3.6V on OVDD) for direct interfacing with mixed-voltage digital systems, and includes dedicated REF and OVDD pins - unlike internal-reference variants - enabling precision scaling via external voltage references up to VDD + 0.05V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8-bit - provides 256 discrete output codes suitable for cost-sensitive, medium-accuracy sensor digitization where 12-bit overhead is unnecessary. |
| Throughput Rate | 3Msps - enables real-time capture of signals up to 1.5MHz Nyquist bandwidth (e.g., ultrasound preamp outputs or motor current waveforms). |
| SNR | 49.8dB (typ @ 1MHz) - sufficient for 8-bit ENOB (~8.3 effective bits) in low-noise analog front-ends with clean power and layout. |
| Power Consumption | 5.2mW @ 3Msps - achieves 1.73µW per sample, critical for always-on sensing nodes powered by coin cells or energy harvesters. |
| Aperture Jitter | 15ps - limits sampling uncertainty to <0.02 LSB at 1MHz input, preserving dynamic performance without external clock conditioning. |
| Reference Input Range | 1V to VDD + 0.05V - allows use of precision external references (e.g., MAX6126) for stable full-scale scaling across temperature and supply variation. |
| Operating Temperature | −40°C to +125°C - qualified for under-hood automotive, industrial PLC I/O modules, and downhole instrumentation. |
Pinout & Package
MAX11111ATB+T is housed in a 10-pin, 3mm × 3mm TDFN-EP package with exposed pad for thermal enhancement and ground connection. Pin numbering follows standard TDFN top-view convention (pin 1 marked by dot).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CS) | Chip Select | Active-low enable for serial frame initiation; falling edge triggers conversion start and DOUT release from high-Z. |
| 2 (SCLK) | Serial Clock | Master-controlled clock (up to 48MHz); rising edge samples DOUT, falling edge shifts next bit - no external logic needed for SPI/QSPI. |
| 3 (DOUT) | Serial Data Output | 3-state CMOS output; tri-states when CS high; delivers MSB-first 8-bit result within t4 ≤15ns after SCLK falling edge. |
| 4 (AIN1) | Analog Input Channel 1 | Single-ended input referenced to AGND; accepts 0V to VREF range; 20pF track capacitance minimizes settling burden on driving source. |
| 5 (AIN2) | Analog Input Channel 2 | Second single-ended input; shares same SAR core as AIN1; channel selection controlled by CHSEL state during CS assertion. |
| 6 (REF) | External Reference Input | High-impedance reference node (5pF); sets full-scale range; supports external precision references for metrology-grade scaling. |
| 7 (AGND) | Analog Ground | Separate ground return for analog circuitry; must be tied to system AGND with low-inductance path to minimize noise coupling into SAR core. |
| 8 (VDD) | Analog/Digital Supply | Primary 2.2V–3.6V supply powering ADC core, reference buffer, and internal logic; decoupling required within 1cm of pin. |
| 9 (OVDD) | I/O Supply Voltage | Digital interface supply (1.5V–3.6V); isolates logic-level compatibility from analog supply - enables direct connection to 1.8V FPGA I/O banks. |
| 10 (CHSEL) | Channel Select | Static logic input determining active analog channel (AIN1 or AIN2) during conversion; sampled on CS falling edge. |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay | True SAR architecture delivers first valid conversion result within one clock cycle after CS assertion - essential for closed-loop control timing predictability. |
| Dual single-ended inputs with MUX | Hardware-selectable AIN1/AIN2 routing eliminates need for external analog switches or multiplexers, reducing BOM count and board area in multi-sensor nodes. |
| Variable I/O voltage (1.5V–3.6V) | OVDD pin allows native interfacing with 1.8V microcontrollers or FPGAs without level shifters - simplifies digital integration and reduces signal integrity risk. |
| Low power-down current (1.3µA) | Enables ultra-low-quiescent operation between sampling bursts; supports duty-cycled acquisition schemes extending battery life beyond 10 years in IoT endpoints. |
| −40°C to +125°C operation | Guaranteed parametric performance across full industrial and automotive ambient ranges - no derating required for thermal design. |
Applications
| Portable Medical Sensors | Battery-Powered Data Loggers |
|---|---|
Use Scenario: Continuous ECG lead-off detection and respiration waveform capture in handheld patient monitors. IC Role / Device Role / Timing Role: Dual-channel ADC digitizing differential amplifier outputs from two sensor paths with synchronized sampling. Use Value: 3Msps throughput captures transient ST-segment anomalies; 8-bit resolution meets clinical diagnostic thresholds while minimizing flash storage and BLE transmission overhead. |
Use Scenario: Environmental monitoring node logging temperature, humidity, and CO₂ over 5-year battery life. IC Role / Device Role / Timing Role: Low-power ADC acquiring conditioned analog outputs from multiple sensors in burst mode. Use Value: 1.3µA power-down current extends coin-cell lifetime; external REF support ensures long-term calibration stability against supply drift. |
| Automotive Cabin Sensors | Industrial Motor Current Monitoring |
Use Scenario: Occupancy detection via capacitive touch and cabin air quality (CO/VOC) sensing in ADAS-enabled vehicles. IC Role / Device Role / Timing Role: Dual-input ADC sampling parallel sensor signal chains for real-time fusion algorithms. Use Value: −40°C to +125°C rating ensures reliability in unheated door modules; TDFN-EP package withstands automotive vibration and thermal cycling. |
Use Scenario: Inverter phase current feedback in compact BLDC motor drives for HVAC and robotics. IC Role / Device Role / Timing Role: High-speed digitization of isolated shunt amplifier outputs for field-oriented control loops. Use Value: 15ps aperture jitter preserves current waveform fidelity at 20kHz PWM frequencies; 3-wire SPI interface reduces MCU GPIO usage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel, serial ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX11103ATB+ | 12-bit resolution, same 3Msps rate, identical TDFN-EP package and pinout - but higher 72.5dB SNR and ±1LSB INL vs. MAX11111ATB+T's 8-bit/±0.15LSB INL. | Required where higher dynamic range is needed (e.g., audio preamps, precision thermocouple amplification), not for basic threshold detection. | Select MAX11103ATB+ when ENOB > 11.5 bits is mandatory; MAX11111ATB+T saves cost and reduces firmware complexity where 8-bit quantization suffices. |
| ADS7953IRHBT | 12-bit, 16-channel, SPI interface, 2.5V–5.25V supply - larger 32-pin QFN package, no CHSEL pin, uses internal register-based channel addressing. | Suited for multi-sensor systems requiring >2 channels (e.g., PLC analog input modules), not dual-input space-constrained designs. | Choose ADS7953IRHBT only when expanding beyond two channels; MAX11111ATB+T offers lower footprint, simpler control, and better power efficiency for exactly two inputs. |
Compared with MAX11103ATB+, the MAX11111ATB+T trades 4-bit resolution and 23dB SNR for 40% lower system cost, reduced firmware overhead (no bit-packing), and tighter thermal profile - making it optimal for binary decision-based sensor fusion. Against ADS7953IRHBT, it delivers identical dual-channel functionality in 31% less PCB area and 60% lower active power.
Availability
MAX11111ATB+T is available at Aetrix Electronics and suitable for portable medical sensors, battery-powered data loggers, and automotive cabin sensors requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX11111ATB+T 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 and mixed-signal ICs for demanding industrial, automotive, and medical applications.
The MAX111xx family targets ultra-low-power, high-speed data acquisition in space-constrained, battery-operated systems - emphasizing minimal external components, wide temperature operation, and direct digital interface compatibility.
FAQ
What is the maximum serial clock frequency supported by the MAX11111ATB+T?
The MAX11111ATB+T supports up to 48MHz SCLK (fCLK), enabling full 8-bit readout in ≤170ns per conversion at 3Msps throughput. This matches standard SPI peripheral timing on ARM Cortex-M4/M7 MCUs without overclocking or custom timing registers. The MAX11111ATB+T datasheet specifies t5/t6 pulse widths of 40–60% duty cycle, ensuring robust setup/hold margins across process corners.
Does the MAX11111ATB+T require an external reference voltage, or can it operate with an internal one?
The MAX11111ATB+T requires an external reference voltage applied to the REF pin - it does not include an internal reference. This design allows precise full-scale definition using low-drift external references (e.g., MAX6126) and supports reference voltages from 1V to VDD + 0.05V. Using an external REF ensures consistent scaling across temperature and supply variations, which is critical in metrology-grade applications where the MAX11111ATB+T is deployed.
How does the CHSEL pin function in the MAX11111ATB+T?
The CHSEL pin on the MAX11111ATB+T selects between AIN1 and AIN2 before each conversion: logic high selects AIN2, logic low selects AIN1. Its state is latched on the falling edge of CS, so channel selection is synchronous with frame initiation. This eliminates race conditions and allows deterministic sampling sequencing - for example, alternating channels every other CS assertion to achieve pseudo-simultaneous dual-channel acquisition in the MAX11111ATB+T.
What is the power-down current specification for the MAX11111ATB+T, and how is it activated?
The MAX11111ATB+T draws just 1.3µA (typ) in power-down mode, activated by holding CS high while maintaining VDD and OVDD. This state disables the internal reference buffer, sample-and-hold, and digital interface, retaining only leakage current. Recovery to full operation requires one complete conversion cycle (tPOWER-UP = 1 cycle), enabling rapid wake-up for burst-mode sensing - a key capability leveraged in battery-powered MAX11111ATB+T deployments.
Is the MAX11111ATB+T pin-compatible with other devices in the MAX111xx family?
Yes - the MAX11111ATB+T shares identical pinout and package (10-pin TDFN-EP) with MAX11102ATB+, MAX11103ATB+, MAX11106ATB+, and MAX11110ATB+. This allows drop-in replacement across resolution (8/10/12-bit) and speed (2/3Msps) variants without PCB redesign. However, functional behavior differs: MAX11111ATB+T requires external REF and supports CHSEL-driven dual-input selection, whereas single-channel variants like MAX11115ATB+ omit CHSEL and derive REF internally.
MAX11111ATB+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 8
- Sampling Rate (Per Second):
- 3M
- Number of Inputs:
- 2
- Input Type:
- 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:
- 2.2V ~ 3.6V
- Voltage - Supply, Digital:
- 2.2V ~ 3.6V
- Features:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Supplier Device Package:
- 10-TDFN (3x3)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX11111ATB+T FAQ
1.How can I place an order for MAX11111ATB+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX11111ATB+T 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 MAX11111ATB+T reliable?
The price and inventory of MAX11111ATB+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX11111ATB+T is usually 5 days.
3.What payment methods are accepted for MAX11111ATB+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX11111ATB+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX11111ATB+T?
MAX11111ATB+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX11111ATB+T 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 MAX11111ATB+T?
For technical support, including MAX11111ATB+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX11111ATB+T requirements.
6.How does Aetrix verify that MAX11111ATB+T is sourced from the original manufacturer or authorized distributors?
All MAX11111ATB+T 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 MAX11111ATB+T meets industry standards.
7.What is the process for return or replacement of MAX11111ATB+T?
All MAX11111ATB+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX11111ATB+T, 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 MAX11111ATB+T part is unused and in its original packaging.
Return procedure for MAX11111ATB+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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