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Analog Devices Inc./Maxim Integrated MAX111BEWE+
- Part No.:
- MAX111BEWE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MAX111BEWE+.pdf
- Description:
- IC ADC 14BIT SIGMA-DELTA 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,155
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Product details
Overview
MAX111BEWE+ from Maxim Integrated is a 2-channel, ±14-bit serial analog-to-digital converter (ADC) with internal auto-calibration, operating from a single +5V supply and delivering 0.05% linearity over ±1.5V differential input range. It achieves up to 50 conversions/sec, features 50Hz/60Hz rejection, and consumes only 640µA active current and 4µA in power-down mode-ideal for precision battery-powered data acquisition and panel metering.
For engineers reviewing the MAX111BEWE+ datasheet, MAX111BEWE+ pinout, MAX111BEWE+ application, or MAX111BEWE+ equivalent, key selection considerations include its 16-pin wide SO package, SPI/QSPI/MICROWIRE compatibility, differential input architecture, ±14-bit resolution with sign and overrange bits, and built-in 50Hz/60Hz noise rejection for industrial sensing environments.
Technical Context
The MAX111BEWE+ implements a first-order sigma-delta architecture with integrated voltage-to-current conversion, integrator, comparator, and 1-bit DAC feedback loop. Its oversampling clock (fOSC) supports divide-by-1/2/4 modes, enabling configurable conversion time and noise attenuation across 10,240–102,400 clock cycles per conversion.
It uses a 16-bit serial output format (sign bit, overrange bit, 14 data bits, MSB-first) compatible with SPI (CPHA=0, CPOL=0), QSPI, and MICROWIRE interfaces. Internal auto-calibration corrects both offset and gain errors under µP control, eliminating need for external trim components while maintaining ±0.05% INL over temperature.
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 overflow detection |
| Differential Input Range | ±1.5V - supports high-accuracy measurement of bipolar sensor outputs without level-shifting circuitry |
| Linearity (INL) | ±0.05% FSR - ensures monotonicity and <±1 LSB error across full scale at room temperature |
| Supply Current | 640µA active / 4µA shutdown - enables multi-year operation on coin-cell batteries in remote monitoring systems |
| Conversion Rate | Up to 50 conversions/sec - balances speed and noise rejection for low-frequency process signals |
| Power Supply | +5V single supply - simplifies system power design versus dual-supply alternatives like MAX110 |
| 50/60Hz Rejection | Integrated digital filtering - eliminates mains-induced noise without external notch filters or software averaging |
Pinout & Package
MAX111BEWE+ is housed in a 16-pin wide SO (SOIC-W) surface-mount package with standard 0.3-inch body width and 0.050-inch lead pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN1+, IN1- | Differential analog input channel 1 | Accepts ±1.5V differential signal; absolute pin voltage must stay within 0V to VDD–3.2V |
| IN2+, IN2- | Differential analog input channel 2 | Second independent 2-wire input pair; shares same reference and timing resources |
| REF+, REF- | Differential reference input | Sets full-scale range; VREF = VREF+ – VREF-; default 1.5V for ±1.5V input span |
| CS | Chip-select input | Active-low enable for serial interface; rising edge initiates conversion when NO-OP = 1 |
| SCLK | Serial clock input | TTL/CMOS-compatible; controls data transfer timing; DC to 2MHz operation supported |
| DIN | Serial data input | Loads 16-bit control word (NO-OP, CONV bits, CAL, PD, etc.) on SCLK rising edge |
| DOUT | Serial data output | 3-state output; shifts out 16-bit result (POL/OFL/D13–D0) on SCLK falling edge |
| BUSY | Conversion status indicator | Active-low open-drain output; asserts low at conversion start, releases high at completion |
| VDD | Positive supply | +5V ±5% main power rail; powers analog and digital sections |
| GND | Digital ground | Return path for digital I/O; separate from analog ground in layout-sensitive designs |
| RCSEL | Oversampling clock source select | High = internal RC oscillator; low = external clock applied to XCLK pin |
| XCLK | Oversampling clock I/O | Input for external clock or output for internal RC oscillator; requires ≤1MΩ pull-up/down in RC mode |
Key Features
| Feature | Design Value |
|---|---|
| Internal auto-calibration | Corrects offset and gain errors under µP control-eliminates manual trimming and reduces calibration overhead in production test |
| No external components required | Full functionality with only decoupling capacitors-reduces BOM count, PCB area, and failure points in space-constrained modules |
| 50Hz/60Hz rejection | Hardware-based digital filtering synchronized to line frequency-enables clean measurements in electrically noisy factory environments |
| Two differential input channels | Independent channel switching via CHS bit-supports multiplexed sensor arrays without external analog switches or mux drivers |
| Low-power shutdown mode | 4µA quiescent current with full state retention-facilitates wake-on-event architectures in portable instrumentation |
Applications
| Process Control | Weigh Scales |
|---|---|
Use Scenario: Monitoring pressure, flow, and temperature transducers in PLC-connected industrial loops. IC Role / Device Role / Timing Role: Precision digitization of 4–20mA loop-derived differential signals with inherent 50/60Hz noise immunity. Use Value: Eliminates need for external isolation amplifiers or line-frequency notch filters, reducing system cost and board space. | Use Scenario: High-resolution weight measurement using strain-gauge bridges in commercial and industrial scales. IC Role / Device Role / Timing Role: Direct interface to bridge outputs with ±1.5V differential range matching typical bridge excitation schemes. Use Value: Achieves <±1 LSB linearity without post-processing, enabling Class III legal-for-trade accuracy certification. |
| Panel Meters | Data-Acquisition Systems |
Use Scenario: Front-panel analog readouts in test equipment and building management displays. IC Role / Device Role / Timing Role: Local ADC with SPI interface feeding microcontroller display driver; operates continuously at 10–20 Hz. Use Value: Single +5V supply and compact SO package simplify front-end design versus multi-rail alternatives. | Use Scenario: Modular DAQ modules for lab and field use requiring multi-sensor synchronization. IC Role / Device Role / Timing Role: Dual-channel sampling node with shared reference and clock; supports time-aligned readings across inputs. Use Value: Internal calibration ensures long-term drift stability, reducing recalibration intervals in unattended deployments. |
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, programmable gain amplifier (PGA) | Requires I²C host; PGA enables small-signal measurement without external amplification | Select when system already uses I²C and needs programmable gain; not drop-in for SPI-based MAX111BEWE+ designs |
| AD7730BRUZ | 24-bit sigma-delta ADC, SPI interface, ±10V input range, integrated current sources for RTD excitation | Higher resolution and wider input range; includes excitation for 3-/4-wire RTDs | Select for high-precision temperature measurement with direct RTD support; larger footprint and higher cost than MAX111BEWE+ |
Compared with ADS1115IDGSR and AD7730BRUZ, MAX111BEWE+ offers optimal balance of ±14-bit resolution, SPI compatibility, low power, and minimal external components for cost-sensitive industrial sensing-without requiring I²C infrastructure or RTD-specific features.
Availability
MAX111BEWE+ is available at Aetrix Electronics and suitable for process control, weigh scales, and panel meters requiring stable component supply and long-lifecycle support.
Supply support for MAX111BEWE+ 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, low power, and serial interface simplicity over raw speed or ultra-high resolution.
FAQ
What is the operating temperature range for MAX111BEWE+?
The MAX111BEWE+ is specified for operation from –40°C to +85°C (industrial grade). This range is confirmed by the "E" suffix in the part number and aligns with the MAX111E temperature grade listed in the ordering information table. The device maintains ±0.05% INL and 640µA supply current performance across this full range, making it suitable for deployment in harsh environmental conditions without derating.
Does MAX111BEWE+ require external calibration components?
No, MAX111BEWE+ does not require external calibration components. Its internal auto-calibration circuitry corrects both offset and gain errors under microprocessor control, as explicitly stated in the General Description and Features sections. This capability eliminates the need for external trimpots, precision resistors, or laser-trimmed references-reducing BOM cost and improving long-term stability in production systems.
How is the reference voltage configured on MAX111BEWE+?
The MAX111BEWE+ uses a differential reference input (REF+ and REF– pins), where VREF = VREF+ – VREF–. For standard ±1.5V input range operation, a 1.5V reference is applied (e.g., REF+ = 1.5V, REF– = 0V). The absolute voltage on each pin must remain within 0V to VDD–3.2V. Reference current is ±500nA, allowing use of low-power voltage references or resistor-divider networks without significant loading error.
Can MAX111BEWE+ interface directly with an 8051 microcontroller?
Yes, MAX111BEWE+ can interface directly with an 8051 microcontroller. The datasheet includes dedicated application diagrams (Figure 7c) showing connections to the 80C51/80C32 family using Port 1 pins for CS, SCLK, DIN, DOUT, and BUSY. Its SPI-compatible interface (CPHA=0, CPOL=0), DC–2MHz SCLK tolerance, and 3-state DOUT ensure reliable communication without additional level-shifting or buffering.
What is the function of the BUSY pin on MAX111BEWE+?
The BUSY pin on MAX111BEWE+ is an active-low, open-drain output that signals conversion status: it goes low at conversion start and returns high upon completion. It enables interrupt-driven data retrieval-freeing the microcontroller during conversion-and supports daisy-chained configurations where BUSY from one device triggers CS on the next. Its timing is guaranteed across temperature and supply voltage, with tDO and tDH parameters fully characterized in the datasheet.
MAX111BEWE+ 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:
- -40°C ~ 85°C
- Supplier Device Package:
- 16-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX111BEWE+ FAQ
1.How can I place an order for MAX111BEWE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX111BEWE+ 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 MAX111BEWE+ reliable?
The price and inventory of MAX111BEWE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX111BEWE+ is usually 5 days.
3.What payment methods are accepted for MAX111BEWE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX111BEWE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX111BEWE+?
MAX111BEWE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX111BEWE+ 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 MAX111BEWE+?
For technical support, including MAX111BEWE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX111BEWE+ requirements.
6.How does Aetrix verify that MAX111BEWE+ is sourced from the original manufacturer or authorized distributors?
All MAX111BEWE+ 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 MAX111BEWE+ meets industry standards.
7.What is the process for return or replacement of MAX111BEWE+?
All MAX111BEWE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX111BEWE+, 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 MAX111BEWE+ part is unused and in its original packaging.
Return procedure for MAX111BEWE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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