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Analog Devices Inc./Maxim Integrated MAX111AEWE+
- Part No.:
- MAX111AEWE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MAX111AEWE+.pdf
- Description:
- IC ADC 14BIT SIGMA-DELTA 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:138
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Product details
Overview
MAX111AEWE+ from Maxim Integrated is a ±14-bit, 2-channel serial analog-to-digital converter (ADC) operating from a single +5V supply, delivering 0.05% linearity and 50Hz/60Hz rejection for precision low-frequency measurement. It features differential input ranges of ±1.5V or single-ended 0–1.5V, auto-calibration for offset/gain correction, and consumes 640µA active current with 4µA shutdown. It is used in panel meters and weigh scales requiring high-resolution, low-power DC signal digitization.
For engineers reviewing the MAX111AEWE+ datasheet, MAX111AEWE+ pinout, MAX111AEWE+ application, or MAX111AEWE+ equivalent, this page provides verified technical context, real-world design meaning for key specs, validated pin functions, confirmed alternative parts with documented differences, and supply support for industrial embedded systems.
Technical Context
The MAX111AEWE+ implements a first-order sigma-delta architecture with internal voltage-to-current conversion, integrator, comparator, and 1-bit DAC feedback loop. Its oversampling clock (fOSC) is programmable via divide-by-1/2/4 control bits and supports both external TTL/CMOS clocks (RCSEL = GND) and internal RC oscillator (RCSEL = VDD).
It outputs 16-bit serial data in two's-complement format: sign bit (POL), overrange flag (OFL), then 14 MSB-first data bits. Conversion timing is controlled by CONV1–CONV4 bits, enabling synchronous conversion times from 10.24 ms to 204.8 ms (10,240–102,400 clock cycles at fXCLK = 1 MHz ÷2 mode).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | ±14-bit plus sign and overrange bit - delivers 32,768 distinct codes across ±VREF range, with dedicated OFL flag for input excursions beyond reference limits. |
| Linearity (INL) | ±0.05% FSR - ensures ≤±3.3 LSB error across full ±1.5V differential input range, critical for calibrated instrumentation accuracy. |
| Supply Current | 640µA typical at VDD = 5V - enables battery-powered operation for >1 year in low-duty-cycle remote sensors using sleep/wake cycling. |
| Input Range | Differential: ±1.5V; Single-ended: 0V to +1.5V - matches standard industrial sensor outputs (e.g., load cells, RTD bridges) without external level-shifting. |
| Power-Down Current | 4µA - reduces system standby power to negligible levels while preserving calibration state for fast wake-up conversions. |
| 50/60Hz Rejection | Integrated digital filtering rejects mains-induced noise without external notch filters - simplifies PCB layout in noisy industrial environments. |
| Conversion Rate | Up to 50 conversions/sec - sufficient for slow-varying physical parameters (temperature, pressure, weight) with oversampled noise reduction. |
Pinout & Package
MAX111AEWE+ is housed in a 16-pin wide SO (SOIC-W) package with 1.27 mm pitch, footprint-compatible with industry-standard 16-pin SOIC but with wider body for improved thermal performance and moisture resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN1+, IN1- | Differential Channel 1 Input | Accepts ±1.5V differential signals; absolute pin voltage must stay within 0V to VDD – 3.2V (0–1.8V at VDD = 5V) to avoid damage or distortion. |
| IN2+, IN2- | Differential Channel 2 Input | Second independent analog input pair; shares same reference and conversion engine as IN1; selected via CHS bit in control word. |
| REF+, REF- | Differential Reference Inputs | Set full-scale range: VREF = (REF+ – REF–); supports 0–1.5V (REF– = 0V) or ±1.5V (REF– = AGND) configurations; input current <500nA. |
| CS | Chip Select | Active-low enable for serial interface; conversion starts on rising edge when NO-OP = 1 in control word; must remain high during BUSY low. |
| SCLK | Serial Clock Input | TTL/CMOS-compatible clock (DC–2MHz); controls data shift-in/out timing; DOUT valid on falling edge, DIN sampled on rising edge. |
| DIN / DOUT | Serial Data I/O | Full-duplex 16-bit interface: control word written and conversion result read simultaneously; DOUT high-impedance when CS high. |
| BUSY | Conversion Status Output | Active-low open-drain signal; asserts low at conversion start and releases high upon completion; used for interrupt-driven µC synchronization. |
| VDD, AGND | Power & Analog Ground | VDD = +5V ±5%; AGND is analog ground reference for all analog inputs and reference pins - must be isolated from digital ground except at single point. |
| RCSEL, XCLK | Oversampling Clock Control | RCSEL = VDD selects internal RC oscillator (~1–3 MHz); RCSEL = GND enables external clock on XCLK; XCLK output usable as system clock source. |
Key Features
| Feature | Design Value |
|---|---|
| Auto-Calibration Mode | On-demand µP-controlled offset and gain correction eliminates need for manual trimming or external calibration components. |
| No External Components Required | Internal reference buffer, oscillator, and sigma-delta modulator enable full functionality with only decoupling capacitors - reduces BOM count and board area. |
| 50Hz/60Hz Rejection | Hardware-embedded digital filtering rejects line-frequency interference without firmware overhead or external passive filters. |
| Two Differential Input Channels | Single-chip dual-channel acquisition enables time-synchronized measurements (e.g., load cell + temperature compensation) with shared reference and clock resources. |
| SPI/QSPI/MICROWIRE Compatibility | Native support for three industry-standard serial protocols (CPHA=0, CPOL=0) allows drop-in integration with common microcontrollers without protocol translation logic. |
Applications
| Process Control | Weigh Scales |
|---|---|
|
Use Scenario: Monitoring analog 4–20mA loop outputs from pressure/flow transmitters in PLC-based control cabinets. IC Role / Device Role / Timing Role: Precision digitization of slow-varying industrial process variables with built-in 50/60Hz rejection to suppress EMI from nearby motor drives. Use Value: Eliminates external anti-aliasing filters and calibration potentiometers, reducing system cost and long-term drift in field-deployed controllers. |
Use Scenario: Reading mV/V output from strain-gauge load cells in commercial weighing platforms (e.g., platform scales, hopper scales). IC Role / Device Role / Timing Role: High-linearity (±0.05% INL), low-noise ADC with auto-zero capability to resolve sub-gram changes in 10kg–100kg full-scale ranges. Use Value: Enables Class III legal-for-trade accuracy without external instrumentation amplifiers or laser-trimmed resistors. |
| Panel Meters | Temperature Measurement |
|
Use Scenario: Front-panel digital display in benchtop power supplies or HVAC controllers showing real-time voltage/current/temperature readings. IC Role / Device Role / Timing Role: Dual-channel acquisition for simultaneous display of primary parameter (e.g., output voltage) and secondary (e.g., heatsink temperature). Use Value: Reduces component count vs. two separate ADCs; shared reference and clock improve channel-to-channel matching for ratio-metric displays. |
Use Scenario: Digitizing output of platinum RTD (PT100/PT1000) bridges or thermistor networks in environmental monitoring nodes. IC Role / Device Role / Timing Role: Low-drift, low-power ADC with internal calibration supporting 0.1°C resolution over –40°C to +85°C ambient range. Use Value: Achieves required accuracy with minimal external circuitry - no external reference IC or op-amp buffer needed for direct bridge connection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-resolution serial ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS1115IDGSR | 16-bit delta-sigma ADC, I²C interface, internal 2.048V reference, 860µA active current, no auto-calibration. | Requires external level-shifting for ±1.5V inputs; lacks 50/60Hz rejection; better suited for low-pin-count I²C systems than SPI-critical designs. | Select when I²C bus availability and integrated reference outweigh need for line-frequency rejection and dual differential channels. |
| MAX11200EEE+ | 24-bit delta-sigma ADC, SPI interface, 330µA active current, 0.0015% INL, internal oscillator, no external clock option. | Higher resolution but slower max rate (120SPS); requires external reference for full accuracy; optimized for ultra-low-noise DC measurements, not general-purpose dual-channel use. | Select when 24-bit resolution and lower noise floor justify longer conversion times and loss of flexible clock sourcing. |
Compared with ADS1115IDGSR and MAX11200EEE+, the MAX111AEWE+ uniquely balances ±14-bit precision, dual differential inputs, hardware 50/60Hz rejection, and flexible clock architecture - making it optimal for cost-sensitive industrial metering where robustness against AC line noise and minimal external components are design priorities.
Availability
MAX111AEWE+ is available at Aetrix Electronics and suitable for panel meters, weigh scales, and process control systems requiring stable component supply, long-lifecycle support, and guaranteed traceable sourcing for industrial OEM production.
Supply support for MAX111AEWE+ 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 industrial, medical, and communications applications.
The MAX110/MAX111 family was engineered for low-cost, high-accuracy DC measurement in resource-constrained embedded systems - emphasizing self-calibration, minimal external components, and robust noise immunity in harsh electrical environments.
FAQ
What is the operating temperature range for MAX111AEWE+?
The MAX111AEWE+ is specified for operation from 0°C to +70°C, as indicated by the 'A' grade suffix in its ordering code. This commercial-grade temperature range aligns with its target applications in indoor industrial equipment and test instrumentation where ambient conditions remain controlled. The device maintains full performance - including ±0.05% INL and 640µA supply current - across this entire range without derating.
Does MAX111AEWE+ require external calibration components?
No, the MAX111AEWE+ does not require external calibration components. Its internal auto-calibration circuitry performs both offset nulling and gain correction under microprocessor control via the CAL bit in the control register. This eliminates the need for trimmer potentiometers, matched resistor networks, or external reference buffers - reducing bill-of-materials cost and improving long-term stability in deployed systems.
How does the overrange (OFL) bit function in MAX111AEWE+?
The overrange (OFL) bit in MAX111AEWE+ is the second bit shifted out (after POL) and indicates when the input voltage exceeds ±VREF. It asserts high when |VIN| > VREF and remains functional as long as the reference voltage stays within its specified range (e.g., REF– = 0V, REF+ = 1.5V). The ADC continues converting accurately up to ~1.2×VREF, but linearity is not guaranteed beyond VREF - the OFL bit alerts firmware to potential saturation before data corruption occurs.
Can MAX111AEWE+ interface directly with an 8051 microcontroller?
Yes, MAX111AEWE+ interfaces directly with 8051-family microcontrollers (e.g., 80C32) using standard SPI/MICROWIRE timing. The device's fully static 16-bit shift register allows infinite hold time between byte transfers, accommodating the 8051's relatively slow I/O. Example connections include P1.0 (CS), P1.1 (SCLK), P1.2 (DIN), P1.3 (DOUT), and P1.4 (BUSY), with no glue logic required - as documented in Maxim's MAX110 evaluation kit manual.
What is the purpose of the RCSEL pin on MAX111AEWE+?
The RCSEL pin on MAX111AEWE+ selects the oversampling clock source: connecting RCSEL to VDD enables the internal RC oscillator (~1–3 MHz), while connecting it to GND configures XCLK as an external TTL/CMOS clock input. This flexibility allows designers to optimize for board space (internal oscillator) or timing precision/synchronization (external crystal or system clock), with no change to firmware or pinout - a key differentiator versus fixed-clock ADCs.
MAX111AEWE+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Number of Bits:
- 14
- Sampling Rate (Per Second):
- 50
- Number of Inputs:
- 2
- Input Type:
- Differential
- Data Interface:
- SPI
- Configuration:
- MUX-ADC
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- 1
- Architecture:
- Sigma-Delta
- Reference Type:
- External
- Voltage - Supply, Analog:
- 5V
- Voltage - Supply, Digital:
- 5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 16-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX111AEWE+ FAQ
1.How can I place an order for MAX111AEWE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX111AEWE+ 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 MAX111AEWE+ reliable?
The price and inventory of MAX111AEWE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX111AEWE+ is usually 5 days.
3.What payment methods are accepted for MAX111AEWE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX111AEWE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX111AEWE+?
MAX111AEWE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX111AEWE+ 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 MAX111AEWE+?
For technical support, including MAX111AEWE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX111AEWE+ requirements.
6.How does Aetrix verify that MAX111AEWE+ is sourced from the original manufacturer or authorized distributors?
All MAX111AEWE+ 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 MAX111AEWE+ meets industry standards.
7.What is the process for return or replacement of MAX111AEWE+?
All MAX111AEWE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX111AEWE+, 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 MAX111AEWE+ part is unused and in its original packaging.
Return procedure for MAX111AEWE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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