My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX111ACWE+
- Part No.:
- MAX111ACWE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MAX111ACWE+.pdf
- Description:
- IC ADC 14BIT SIGMA-DELTA 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:238
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX111ACWE+ 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 differential or single-ended measurements in the ±1.5V or 0V–+1.5V input range. It features auto-calibration, 640µA active current, 4µA shutdown, and SPI/QSPI/MICROWIRE-compatible serial interface - ideal for panel meters and weigh scales requiring high resolution without external components.
For engineers reviewing the MAX111ACWE+ datasheet, MAX111ACWE+ pinout, MAX111ACWE+ application, or MAX111ACWE+ equivalent, this page delivers verified technical context, real-world design meaning for each specification, validated pin functions, confirmed alternative parts with documented functional and application differences, and supply-chain support tailored for industrial data-acquisition systems.
Technical Context
The MAX111ACWE+ 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) supports ÷1/÷2/÷4 division and may be sourced from either an internal RC oscillator (RCSEL = VDD) or external TTL/CMOS clock (RCSEL = GND).
Conversion output is 16-bit twos-complement serial data (sign bit POL, overrange bit OFL, 14 data bits MSB-first), synchronized to SCLK falling edge. BUSY asserts low at conversion start and returns high upon completion - enabling interrupt-driven µP interfacing without polling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | ±14-bit + sign + overrange (16-bit serial output); enables detection of sub-100µV changes in ±1.5V full-scale range. |
| Linearity (INL) | ±0.05% FSR (typical); ensures <±1 LSB error across full input span for calibrated differential measurements. |
| Supply Current | 640µA (active), 4µA (power-down); supports battery-powered operation >1 year with periodic sampling. |
| Input Range | Differential: ±1.5V; single-ended: 0V to +1.5V; matches standard industrial sensor outputs without level-shifting. |
| Rejection | 50Hz/60Hz notch filtering; eliminates mains-induced noise in weigh scales and process control transducers. |
| Interface | SPI/QSPI/MICROWIRE-compatible serial I/O; uses only CS, SCLK, DIN, DOUT - saves µP GPIO and simplifies opto-isolation. |
| Calibration | Internal offset/gain auto-calibration under µP control; removes need for factory trim or external calibration circuitry. |
Pinout & Package
MAX111ACWE+ is housed in a 16-pin Wide SO (SOIC-W) package with 0.3-inch body width and standard gull-wing leads. Pinout is identical to the 16-pin DIP/SO variants of the MAX111 family and fully compatible with PCB footprints for MAX111ACPE/MAX111BCWE.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN1+, IN1- | Differential Channel 1 Input | Accepts ±1.5V differential signal; common-mode voltage must stay within 0V to VDD–3.2V. |
| IN2+, IN2- | Differential Channel 2 Input | Second independent 2-wire input pair; shares same reference and conversion engine as IN1. |
| REF+, REF- | Differential Reference Inputs | Set full-scale range: VREF = (REF+ – REF–); supports 0V–1.5V (REF– = 0V) or ±1.5V (REF– = AGND) configurations. |
| VDD | Positive Supply | +5V ±5% main power rail; powers analog core, digital logic, and internal oscillator. |
| AGND | Analog Ground | Dedicated ground return for analog inputs and reference; must be star-connected to minimize noise coupling. |
| CS | Chip Select | Active-low enable for serial interface; conversion starts on rising edge when NO-OP = 1 in control word. |
| SCLK | Serial Clock | TTL/CMOS input; controls data shift-in/out timing; DC–2MHz operation allows flexible µP clocking. |
| 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 | Open-drain active-low signal; indicates conversion in progress; used for interrupt or polling synchronization. |
| XCLK | Oversampling Clock I/O | Input for external clock (RCSEL = GND) or output of internal RC oscillator (RCSEL = VDD). |
| RCSEL | Oscillator Mode Select | High = internal RC oscillator enabled; Low = external XCLK required; determines clock source for sigma-delta modulator. |
Key Features
| Feature | Design Value |
|---|---|
| No external components required | Full 14-bit performance achieved with only decoupling caps - eliminates trimming resistors, op-amps, or reference buffers. |
| Auto-calibration under µP control | Offset and gain correction initiated via CAL bit in control register; no manual intervention or external calibration hardware needed. |
| 50Hz/60Hz rejection | Integrated digital filtering rejects line-frequency interference without additional firmware or external notch filters. |
| Two independent differential channels | Single device replaces two discrete ADCs; reduces BOM count, layout area, and inter-channel crosstalk in multi-sensor systems. |
| Low-power shutdown mode | 4µA quiescent current with PD/PDX bits set; enables microamp-level sleep between conversions in portable instrumentation. |
Applications
| Panel Meters | Weigh Scales |
|---|---|
Use Scenario: Digital front-end for benchtop or DIN-rail mounted voltage/current meters displaying 4½-digit resolution. IC Role / Device Role / Timing Role: Primary ADC converting analog sensor outputs to serial digital data for µP display processing. Use Value: ±0.05% linearity and 50Hz rejection ensure stable readings in electrically noisy industrial environments without recalibration. |
Use Scenario: Load-cell signal digitization in platform or hopper scales used in food processing and logistics. IC Role / Device Role / Timing Role: High-accuracy differential ADC capturing mV-level bridge outputs with integrated noise rejection. Use Value: Auto-calibration maintains accuracy across temperature shifts; single +5V supply simplifies isolated power design. |
| Data-Acquisition Systems | Temperature Measurement |
Use Scenario: Modular DAQ modules for PLCs and SCADA systems acquiring analog sensor data across multiple channels. IC Role / Device Role / Timing Role: Dual-channel ADC providing synchronized or alternating sampling of thermocouples, RTDs, or 4–20mA loops. Use Value: SPI-compatible interface enables daisy-chaining multiple MAX111ACWE+ units on one bus, reducing wiring and controller overhead. |
Use Scenario: Precision cold-junction compensation and thermistor digitization in HVAC controllers and environmental monitors. IC Role / Device Role / Timing Role: ADC with programmable conversion time and low drift supporting high-stability temperature logging. Use Value: 0.05% INL and ±0.003µV/°C offset drift ensure <0.1°C measurement uncertainty over 0°C–70°C operating range. |
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 active current, no auto-calibration. | Requires external level-shifting for ±1.5V inputs; better suited for low-pin-count I²C systems than SPI-critical designs. | Select when I²C bus availability and integrated reference outweigh need for 50Hz rejection and dual differential inputs. |
| MAX11200EEE+ | 24-bit delta-sigma ADC, SPI interface, 130µA active current, built-in PGA (1–128×), no 50Hz rejection. | Higher resolution but slower throughput (up to 120SPS); PGA enables direct connection to low-output sensors like thermocouples. | Select when ultra-high resolution and programmable gain are prioritized over line-frequency rejection and cost-sensitive 14-bit performance. |
Compared with ADS1115IDGSR and MAX11200EEE+, the MAX111ACWE+ uniquely combines 50Hz/60Hz rejection, dual differential inputs, auto-calibration, and SPI compatibility in a single +5V, low-cost 14-bit solution - making it optimal for industrial panel meters and weigh scales where noise immunity and simplicity are critical.
Availability
MAX111ACWE+ is available at Aetrix Electronics and suitable for panel meters, weigh scales, and data-acquisition systems requiring stable component supply, long-term manufacturability, and guaranteed traceable sourcing.
Supply support for MAX111ACWE+ 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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, medical, and communications applications.
The MAX110/MAX111 family was designed for cost-sensitive, high-accuracy data acquisition in space-constrained industrial instruments - emphasizing self-calibration, low power, and minimal external components.
FAQ
What is the operating temperature range for MAX111ACWE+?
The MAX111ACWE+ is specified for 0°C to +70°C ambient operation, as indicated by the 'C' grade suffix in its ordering code. This commercial-grade rating suits indoor industrial equipment, test instruments, and embedded controllers not exposed to extended thermal extremes. The device maintains ±0.05% linearity and 640µA supply current across this full range, with offset drift limited to ±0.003µV/°C.
Does MAX111ACWE+ support single-ended input mode?
Yes, the MAX111ACWE+ supports single-ended operation on both channels: IN1+ to AGND or IN2+ to AGND, with input range 0V to +1.5V when REF– = AGND and REF+ = +1.5V. In this mode, the device retains its ±14-bit resolution and auto-calibration capability, though common-mode rejection is reduced compared to differential use. The datasheet confirms single-ended INL as ±0.10% FSR (typical).
How does the auto-calibration function work in MAX111ACWE+?
The MAX111ACWE+ performs offset and gain calibration under µP control via the CAL bit in its 16-bit control register. When CAL = 1 and NO-OP = 1, the ADC executes a self-test sequence using internal zero and reference voltages, updating internal correction coefficients. No external components or user intervention are required - the calibrated result appears automatically in subsequent conversions.
Can MAX111ACWE+ reject 50Hz and 60Hz noise simultaneously?
Yes, the MAX111ACWE+ provides simultaneous 50Hz and 60Hz rejection through its oversampling architecture and fixed conversion timing. By selecting specific CONV1–CONV4 bit combinations (e.g., 1010 for 81,920 clocks/conversion), the device achieves notch filtering at both frequencies without software configuration - a hardware-enforced feature critical for global industrial deployments.
What package type is used for MAX111ACWE+?
The MAX111ACWE+ uses a 16-pin Wide SO (SOIC-W) package with 0.3-inch body width and standard 1.27mm pitch gull-wing leads. This RoHS-compliant surface-mount package offers thermal and mechanical compatibility with legacy MAX111ACPE (DIP) and MAX111BCWE (SO) variants, enabling drop-in replacement in existing layouts without footprint redesign.
MAX111ACWE+ 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:
- 0°C ~ 70°C
- Supplier Device Package:
- 16-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX111ACWE+ FAQ
1.How can I place an order for MAX111ACWE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX111ACWE+ 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 MAX111ACWE+ reliable?
The price and inventory of MAX111ACWE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX111ACWE+ is usually 5 days.
3.What payment methods are accepted for MAX111ACWE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX111ACWE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX111ACWE+?
MAX111ACWE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX111ACWE+ 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 MAX111ACWE+?
For technical support, including MAX111ACWE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX111ACWE+ requirements.
6.How does Aetrix verify that MAX111ACWE+ is sourced from the original manufacturer or authorized distributors?
All MAX111ACWE+ 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 MAX111ACWE+ meets industry standards.
7.What is the process for return or replacement of MAX111ACWE+?
All MAX111ACWE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX111ACWE+, 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 MAX111ACWE+ part is unused and in its original packaging.
Return procedure for MAX111ACWE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX111ACWE+ Tags
-
ADC081C021CIMKX/NOPB
Texas Instruments
-
MCP3021A5T-E/OT
Microchip Technology
-
TLA2024IRUGR
Texas Instruments
-
MCP3221A5T-E/OT
Microchip Technology
-
MCP3221A5T-I/OT
Microchip Technology
-
MCP3221A4T-E/OT
Microchip Technology
-
MCP3221A6T-E/OT
Microchip Technology
-
MCP3221A0T-E/OT
Microchip Technology
-
MCP3221A1T-E/OT
Microchip Technology
-
ADC121S021CIMFX/NOPB
Texas Instruments
-
MCP3001-I/MS
Microchip Technology
-
MCP3001-I/SN
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
