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Analog Devices Inc./Maxim Integrated MAX111BCWE+
- Part No.:
- MAX111BCWE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MAX111BCWE+.pdf
- Description:
- IC ADC 14BIT SIGMA-DELTA 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,369
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Product details
Overview
MAX111BCWE+ from Maxim Integrated is a ±14-bit, 2-channel serial analog-to-digital converter (ADC) operating from a single +5V supply, delivering 0.05% INL accuracy 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 only 640µA active current (4µA in power-down). It is used in panel meters and weigh scales requiring stable, high-resolution digitization without external components.
For engineers reviewing the MAX111BCWE+ datasheet, MAX111BCWE+ pinout, MAX111BCWE+ application, or MAX111BCWE+ 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-chain support details specific to the MAX111BCWE+ variant.
Technical Context
The MAX111BCWE+ 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 internal RC oscillator (RCSEL = VDD) or external TTL/CMOS source (RCSEL = GND), with division-by-1/2/4 options.
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, supporting up to 50 conversions/sec with synchronous timing referenced to SCLK and BUSY signaling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | ±14-bit plus sign and overrange bit - delivers 16-bit serial output with unambiguous polarity and saturation detection. |
| INL Accuracy | ±0.05% FSR - ensures ≤1 LSB error across full ±1.5V differential input range after calibration. |
| Supply Current | 640µA typical at +5V - enables battery-powered operation with <1mW active power dissipation. |
| Power-Down Current | 4µA - reduces system standby power by >99%, critical for remote sensing nodes. |
| Input Range | Differential ±1.5V or single-ended 0–1.5V - matches standard industrial sensor outputs and eliminates need for level-shifting circuitry. |
| Rejection | 50Hz/60Hz notch - suppresses mains interference without external filters, simplifying EMI-sensitive designs. |
| Conversion Rate | Up to 50 conversions/sec - supports real-time monitoring of slow-varying physical parameters like temperature or pressure. |
Pinout & Package
MAX111BCWE+ is supplied in a 16-pin Wide SO (SOIC-W) package with 0.3-inch body width and standard gull-wing leads. Pin numbering follows JEDEC MS-013, with exposed pad not electrically connected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 IN1+ | Channel 1 positive analog input | Differential input terminal for first channel; must remain within 0V to VDD−3.2V (0–1.8V @ +5V). |
| 2 REF− | Negative reference input | Reference ground for differential mode; tied to AGND when using single-ended configuration. |
| 3 REF+ | Positive reference input | Defines full-scale range (VREF+ − VREF−); accepts 0–1.5V differential input with ±10nA leakage. |
| 4 VDD | Positive supply input | +5V ±5% supply; powers analog core and digital interface; decoupling required near pin. |
| 5 RCSEL | Oscillator mode select | Connect to VDD for internal RC clock (≈1MHz), or GND for external XCLK source. |
| 6 XCLK | Oversampling clock I/O | Output of internal RC oscillator (RCSEL = VDD) or input for external clock (RCSEL = GND). |
| 7 SCLK | Serial interface clock | TTL/CMOS-compatible input; controls DIN/DOUT timing; DC–2MHz operation supported. |
| 8 DIN | Serial data input | Accepts 16-bit control word on SCLK rising edge; NO-OP bit enables configuration update. |
| 9 DOUT | Serial data output | Three-state output; drives POL/OFL/D13–D0 on SCLK falling edge; high-impedance when CS high. |
| 10 BUSY | Conversion status indicator | Active-low open-drain signal; asserts low at conversion start and releases high upon completion. |
| 11 CS | Chip-select input | Active-low enable; initiates read/write cycle; must stay high during conversion to avoid abort. |
| 12 IN1− | Channel 1 negative analog input | Completes differential pair with IN1+; defines polarity: VIN− > VIN+ yields negative result. |
| 13 IN2+ | Channel 2 positive analog input | Second differential input; shares same voltage range and bias constraints as IN1+. |
| 14 IN2− | Channel 2 negative analog input | Second differential input complement; enables dual-sensor acquisition without multiplexer. |
| 15 AGND | Analog ground | Separate ground return for analog section; must be star-connected to minimize noise coupling. |
| 16 GND | Digital ground | Digital interface reference; isolated from AGND except at single-point system ground. |
Key Features
| Feature | Design Value |
|---|---|
| No external components required | Internal auto-calibration eliminates trim pots, reference buffers, and external oscillators - reduces BOM count and layout area. |
| Two differential input channels | Simultaneous independent acquisition from two sensors (e.g., load cell + temperature) without external MUX or sequencing logic. |
| 50Hz/60Hz rejection | Integrated digital filtering rejects line-frequency interference without external notch filters or software averaging overhead. |
| Auto-calibration under µP control | Offset and gain correction initiated via CAL bit in control register - enables field recalibration without hardware access. |
| Low-power shutdown mode | 4µA quiescent current with PD/PDX bits set - extends battery life in intermittent-read applications like wireless sensor nodes. |
Applications
| Panel Meters | Weigh Scales |
|---|---|
Use Scenario: Digital front-end for benchtop or industrial panel meters measuring voltage, current, or resistance with 0.01% display resolution. IC Role / Device Role / Timing Role: Primary ADC digitizing analog sensor outputs; provides calibrated 16-bit serial output synchronized to microcontroller SPI interface. Use Value: Eliminates external reference and calibration circuitry while maintaining ±0.05% INL across temperature - reduces total cost and improves long-term stability. |
Use Scenario: Load-cell signal conditioning in commercial weighing systems requiring legal-for-trade accuracy and EMI immunity. IC Role / Device Role / Timing Role: Dual-channel differential ADC acquiring bridge outputs; uses 50Hz/60Hz rejection to suppress ambient AC interference. Use Value: Delivers true 14-bit effective resolution without external filtering - meets OIML R76 Class III requirements with simplified PCB layout. |
| Temperature Measurement | Data-Acquisition Systems |
Use Scenario: High-accuracy thermocouple or RTD digitization in HVAC controllers and environmental monitors. IC Role / Device Role / Timing Role: Precision ADC interfacing to cold-junction compensation circuits; leverages auto-calibration to compensate for thermal drift. Use Value: Achieves ±0.1°C accuracy over −40°C to +85°C without factory calibration - lowers test time and field maintenance costs. |
Use Scenario: Modular DAQ module for lab equipment or industrial PLC analog input cards handling multiple sensor types. IC Role / Device Role / Timing Role: Configurable 2-channel ADC supporting both differential and single-ended modes; controlled via SPI from host processor. Use Value: Single-component solution for ±1.5V and 0–1.5V inputs - reduces channel-to-channel crosstalk and enables per-channel gain switching. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 14-bit serial ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS1115IDGSR | 16-bit delta-sigma ADC, I²C interface, internal 2.048V reference, 860µA supply current. | Requires I²C host; lacks 50/60Hz rejection; no dual differential channels - needs external PGA for gain flexibility. | Select for space-constrained I²C systems where reference stability outweighs line-rejection needs. |
| AD7730BRUZ | 16-bit sigma-delta ADC, SPI interface, ±2.5V input range, 1.2mA supply current, integrated PGA. | Wider input range but higher power; requires external reference; no built-in 50/60Hz filter - needs DSP post-processing. | Select when measuring ±2.5V industrial signals and PGA programmability is required over ultra-low power. |
Compared with MAX111BCWE+, ADS1115IDGSR offers higher resolution but lacks hardware-based line-frequency rejection and dual-channel differential capability, while AD7730BRUZ provides greater input range and PGA integration at the cost of 2× higher supply current and no auto-calibration - making MAX111BCWE+ optimal for low-power, EMI-prone, dual-sensor applications.
Availability
MAX111BCWE+ is available at Aetrix Electronics and suitable for panel meters, weigh scales, and temperature measurement systems requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for MAX111BCWE+ 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 resource-constrained systems - emphasizing self-calibration, minimal external components, and robust noise immunity in ±14-bit performance.
FAQ
What is the operating temperature range for MAX111BCWE+?
The MAX111BCWE+ is rated for 0°C to +70°C operation, as indicated by the 'C' suffix in its part number. This commercial-grade temperature range is validated across all electrical specifications including INL (±0.05% FSR), supply current (640µA), and conversion timing. It is not rated for extended industrial (−40°C to +85°C) or military ranges.
Does MAX111BCWE+ require an external reference voltage?
No, MAX111BCWE+ does not require an external reference. It accepts a differential reference input (REF+ and REF−) that can be driven directly by a precision voltage source or resistor divider. The device operates with VREF = 1.5V (REF+ = 1.5V, REF− = 0V) for full ±1.5V input range, and internal calibration maintains accuracy without trimming.
How does the auto-calibration function work in MAX111BCWE+?
Auto-calibration in MAX111BCWE+ is initiated by setting the CAL bit in the 16-bit control word. When enabled, the ADC performs internal offset nulling and gain adjustment using its own reference and analog path - no external stimuli or µP computation is needed. Calibration completes within one conversion cycle and updates internal correction coefficients stored in nonvolatile registers.
Can MAX111BCWE+ interface directly with an SPI microcontroller?
Yes, MAX111BCWE+ is fully compatible with SPI, QSPI, and MICROWIRE interfaces. Its CS, SCLK, DIN, and DOUT pins align with standard SPI timing (CPOL = 0, CPHA = 0), and BUSY provides ready signaling. The device supports DC–2MHz SCLK and outputs data on SCLK falling edge - matching common MCU SPI peripheral configurations without level shifters.
What is the absolute input voltage limit for analog pins on MAX111BCWE+?
For MAX111BCWE+, each analog input pin (IN1+, IN1−, IN2+, IN2−) must remain within 0V to VDD − 3.2V. With a +5V supply, this defines a safe operating range of 0V to +1.8V - exceeding this may cause latch-up or parametric degradation. This limit applies regardless of differential input voltage and is stricter than the ±1.5V full-scale range.
MAX111BCWE+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- 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+ FAQ
1.How can I place an order for MAX111BCWE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX111BCWE+ 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+ reliable?
The price and inventory of MAX111BCWE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX111BCWE+ is usually 5 days.
3.What payment methods are accepted for MAX111BCWE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX111BCWE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX111BCWE+?
MAX111BCWE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX111BCWE+ 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+?
For technical support, including MAX111BCWE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX111BCWE+ requirements.
6.How does Aetrix verify that MAX111BCWE+ is sourced from the original manufacturer or authorized distributors?
All MAX111BCWE+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX111BCWE+?
All MAX111BCWE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX111BCWE+, 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+ part is unused and in its original packaging.
Return procedure for MAX111BCWE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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