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Analog Devices Inc./Maxim Integrated MAX111BCWE+T
- Part No.:
- MAX111BCWE+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MAX111BCWE+T.pdf
- Description:
- IC ADC 14BIT SIGMA-DELTA 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,146
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Product details
Overview
MAX111BCWE+T from Maxim Integrated is a ±14-bit, 2-channel sigma-delta analog-to-digital converter (ADC) operating from a single +5V supply. It delivers 0.05% linearity, 50Hz/60Hz rejection, and auto-calibration for offset/gain error correction - all without external components. Designed for precision low-frequency signal acquisition, it supports differential inputs (±1.5V range) or single-ended inputs (0V to +1.5V), making it ideal for panel meters and industrial weigh scales.
For engineers reviewing the MAX111BCWE+T datasheet, MAX111BCWE+T pinout, MAX111BCWE+T application, or MAX111BCWE+T equivalent, this page provides verified technical context, real-world design meaning of specifications, validated pin functions, confirmed alternative parts with documented differences, and supply-chain support for production deployment.
Technical Context
The MAX111BCWE+T 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 sourced either from an internal RC oscillator (RCSEL = VDD) or external TTL/CMOS clock (RCSEL = GND).
Conversion output is 16-bit serial data in two's-complement format: sign bit (POL), overrange flag (OFL), and 14 data bits (MSB-first). The device supports SPI™, QSPI™, and MICROWIRE™ interfaces with fully static 16-bit I/O shift register, enabling DC–2MHz SCLK operation and interrupt-driven BUSY signaling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | ±14-bit + sign + overrange (16-bit serial output); enables 1:16,384 dynamic range with overflow detection |
| Linearity (INL) | ±0.05% FSR (differential input); ensures ≤±8 LSB error across full ±1.5V input span |
| Supply Current | 640 µA typical (active), 4 µA (power-down); allows battery-powered operation >1 year on coin cell |
| Input Range | Differential: ±1.5V; single-ended: 0V to +1.5V; absolute pin voltage limited to 0V–1.8V (VDD − 3.2V) |
| Conversion Rate | Up to 50 conversions/sec (81,920 clocks/conv at 1MHz XCLK); supports stable readings in noisy 50/60Hz environments |
| Reference Input | VREF+ = 1.5V, VREF− = 0V; differential reference voltage defines full-scale range and enables ratiometric measurement |
| Power Supply | +5V only (no negative rail required); simplifies system power architecture vs. bipolar-supply ADCs |
Pinout & Package
MAX111BCWE+T is housed in a 16-pin wide SO (SOIC-W) package with standard 0.3-inch body width and 1.27mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN1+, IN1− | Differential Channel 1 Analog Input | Accepts ±1.5V differential signal; common-mode voltage must stay within 0V–1.8V |
| IN2+, IN2− | Differential Channel 2 Analog Input | Second independent input pair; shares same reference and conversion engine as IN1 |
| REF+, REF− | Reference Voltage Inputs | Set full-scale range; VREF = VREF+ − VREF− = 1.5V nominal; determines LSB size (91.5µV) |
| CS | Chip Select | Active-low enable for serial interface; rising edge triggers conversion if NO-OP = 1 in control word |
| SCLK | Serial Clock Input | TTL/CMOS-compatible; controls data shift-in/out timing; supports DC–2MHz operation |
| DIN | Serial Data Input | Loads 16-bit control word (NO-OP, CONV bits, CAL, PD, etc.) on SCLK rising edge |
| DOUT | Serial Data Output | Outputs 16-bit result (POL/OFL/D13–D0) on SCLK falling edge; high-impedance when CS high |
| BUSY | Conversion Status Flag | Active-low open-drain output; signals conversion start/end; used for interrupt or polling |
| RCSEL | Oversampling Clock Source Select | High = internal RC oscillator; low = external clock on XCLK; configures clock domain at power-up |
| XCLK | Oversampling Clock I/O | Input for external clock (RCSEL = GND); output for internal RC oscillator (RCSEL = VDD) |
| VDD | Positive Power Supply | +5V ±5%; powers analog and digital sections; no separate AVDD/DVDD required |
| AGND | Analog Ground | Single ground pin for MAX111; must be tied to system analog ground with low-impedance path |
Key Features
| Feature | Design Value |
|---|---|
| Auto-calibration under µP control | Enables offset nulling and gain calibration without external trim components or manual adjustment |
| No external components required | Eliminates need for external reference, op-amps, filters, or calibration resistors - reduces BOM and layout area |
| 50Hz/60Hz rejection | Integrated digital filtering rejects mains interference without external notch filters or software averaging |
| Two differential input channels | Allows simultaneous monitoring of two isolated sensor signals (e.g., load cell + temperature) with shared ADC core |
| Low-power shutdown mode | Reduces current to 4 µA - suitable for wake-on-event architectures in remote sensing nodes |
Applications
| Industrial Panel Meters | Weigh Scale Front-End |
|---|---|
Use Scenario: Digital front-end for 4½-digit benchtop or DIN-rail panel meters measuring voltage, current, or resistance via transducers. IC Role / Device Role / Timing Role: Primary ADC capturing slow-varying analog inputs; provides calibrated 16-bit serial output synchronized to µP-controlled conversions. Use Value: ±0.05% linearity and 50Hz rejection ensure accurate readings in electrically noisy factory environments without additional filtering. |
Use Scenario: Signal conditioning for strain-gauge-based platform scales or hopper scales requiring high-resolution weight measurement. IC Role / Device Role / Timing Role: Differential-input ADC digitizing bridge outputs; auto-calibration compensates for gauge drift and temperature effects. Use Value: Single +5V supply and no external components simplify isolated sensor interface design while maintaining ±1.5V input range compatibility with mV/V bridge outputs. |
| Data-Acquisition Systems | Temperature Monitoring |
Use Scenario: Modular DAQ module for OEM equipment collecting multiple analog sensor signals (pressure, flow, level) at <50Hz sample rate. IC Role / Device Role / Timing Role: Dual-channel ADC sharing reference and clock resources; supports multiplexed or simultaneous sampling via control-word channel select (CHS bit). Use Value: Two independent input pairs reduce component count per channel vs. single-channel ADCs; SPI/QSPI compatibility eases integration with existing µP firmware. |
Use Scenario: Precision thermistor or RTD readout in HVAC controllers, medical devices, or environmental sensors. IC Role / Device Role / Timing Role: High-linearity ADC converting conditioned analog voltage from temperature-sensing circuitry into calibrated digital values. Use Value: 14-bit resolution + sign bit enables direct signed temperature calculation; overrange bit flags sensor fault or out-of-range conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 14-bit sigma-delta ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS1115IDGSR | 16-bit resolution, I²C interface, internal 2.048V reference, no auto-calibration; requires external gain stage for ±1.5V inputs | Lower noise (150nVRMS), but lacks 50Hz rejection and dual differential inputs; better for low-noise DC measurements | Select ADS1115IDGSR when I²C bus availability and higher resolution outweigh need for built-in rejection and dual-channel simplicity. |
| MAX11200EEE+ | 24-bit delta-sigma ADC, SPI interface, ±2.5V input range, integrated PGA (1–128×), 0.0015% INL | Higher precision and programmable gain, but consumes 380µA active current and requires ±2.5V reference | Choose MAX11200EEE+ for ultra-high-accuracy applications where resolution and INL dominate over power and supply simplicity. |
Compared with ADS1115IDGSR and MAX11200EEE+, the MAX111BCWE+T offers unique value in cost-sensitive, dual-channel, single-supply systems requiring built-in 50Hz rejection and zero-component calibration - without demanding 24-bit precision or I²C infrastructure.
Availability
MAX111BCWE+T is available at Aetrix Electronics and suitable for industrial panel meters, weigh scale front-ends, and data-acquisition systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for MAX111BCWE+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 precision analog, mixed-signal, and power-management ICs for industrial, medical, and communications applications.
The MAX110/MAX111 family was engineered for low-cost, high-resolution data acquisition in space-constrained, battery-powered, or remote-sensing systems - prioritizing integration, calibration autonomy, and noise immunity over raw speed.
FAQ
What is the operating temperature range for MAX111BCWE+T?
The MAX111BCWE+T is rated for 0°C to +70°C ambient operation, as indicated by the 'C' suffix in the part number. This commercial-grade temperature range suits indoor industrial instrumentation, laboratory equipment, and consumer-grade measurement devices where environmental extremes are not expected. The device maintains specified linearity (±0.05% INL), supply current (640 µA), and conversion time across this full range.
Does MAX111BCWE+T require external calibration components?
No, the MAX111BCWE+T does not require external calibration components. Its internal auto-calibration circuitry corrects both offset and gain errors under microprocessor control using the CAL bit in the control register. This eliminates the need for external trim pots, precision resistors, or reference buffers - reducing bill-of-materials cost and PCB area while ensuring consistent accuracy across units and over time.
Can MAX111BCWE+T interface directly with an Arduino or STM32 MCU?
Yes, MAX111BCWE+T interfaces directly with Arduino and STM32 MCUs via its SPI-compatible serial interface. It uses standard signals - CS, SCLK, DIN, DOUT, and BUSY - with TTL/CMOS logic levels and DC–2MHz SCLK support. Example code for Arduino and STM32 HAL drivers is available in Maxim's application notes, and the BUSY pin enables efficient interrupt-driven data capture without polling overhead in the MAX111BCWE+T implementation.
What is the function of the OFL (overrange) bit in MAX111BCWE+T output?
The OFL (overrange) bit in the 16-bit serial output of MAX111BCWE+T indicates when the input voltage exceeds the configured reference range (±1.5V differential or 0–1.5V single-ended). It is the second bit shifted out (after POL) and asserts high when |VIN| > VREF. This enables real-time fault detection - such as sensor disconnection or overload - without requiring post-processing, making the MAX111BCWE+T suitable for safety-critical monitoring applications.
How does the RCSEL pin affect MAX111BCWE+T clocking?
The RCSEL pin selects the oversampling clock source for MAX111BCWE+T: high (VDD) enables the internal RC oscillator (~1–3MHz depending on grade), while low (GND) configures XCLK as an external clock input. When RCSEL = VDD, XCLK becomes an output driven by the oscillator; when RCSEL = GND, XCLK accepts an external clock. This flexibility allows the MAX111BCWE+T to operate standalone or synchronize with system clocks - critical for deterministic timing in multi-ADC systems.
MAX111BCWE+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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:
- 0°C ~ 70°C
- Supplier Device Package:
- 16-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX111BCWE+T FAQ
1.How can I place an order for MAX111BCWE+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX111BCWE+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 MAX111BCWE+T reliable?
The price and inventory of MAX111BCWE+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX111BCWE+T is usually 5 days.
3.What payment methods are accepted for MAX111BCWE+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX111BCWE+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX111BCWE+T?
MAX111BCWE+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX111BCWE+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 MAX111BCWE+T?
For technical support, including MAX111BCWE+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX111BCWE+T requirements.
6.How does Aetrix verify that MAX111BCWE+T is sourced from the original manufacturer or authorized distributors?
All MAX111BCWE+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 MAX111BCWE+T meets industry standards.
7.What is the process for return or replacement of MAX111BCWE+T?
All MAX111BCWE+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX111BCWE+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 MAX111BCWE+T part is unused and in its original packaging.
Return procedure for MAX111BCWE+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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