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Analog Devices Inc./Maxim Integrated MAX111ACAP+
- Part No.:
- MAX111ACAP+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
MAX111ACAP+.pdf
- Description:
- IC ADC 14BIT SIGMA-DELTA 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,558
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Product details
Overview
MAX111ACAP+ from Maxim Integrated is a low-cost, 2-channel, ±14-bit serial analog-to-digital converter (ADC) with internal auto-calibration, operating from a single +5V supply and converting differential inputs in the ±1.5V range or single-ended inputs from 0V to +1.5V. It delivers 0.05% linearity, 640µA active supply current, 4µA shutdown current, and supports up to 50 conversions/sec with 50Hz/60Hz rejection - ideal for high-resolution battery-powered panel meters and weigh scales.
For engineers reviewing the MAX111ACAP+ datasheet, MAX111ACAP+ pinout, MAX111ACAP+ application, or MAX111ACAP+ equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternative parts with documented differences, and supply-chain support tailored for industrial data-acquisition systems.
Technical Context
The MAX111ACAP+ implements a first-order sigma-delta architecture with integrated voltage-to-current conversion, integrator, comparator, and 1-bit DAC to generate a 16-bit serial output (14 data bits + sign bit + overrange bit). Its internal auto-calibration corrects both offset and gain errors under µP control.
It supports dual input channels (IN1±, IN2±), accepts differential or single-ended analog signals, and uses an oversampling clock (fOSC) derived either from an external source or its internal RC oscillator (selected via RCSEL). Conversion timing is programmable via CONV1–CONV4 control bits, enabling synchronous conversion times from 10.24 ms to 204.8 ms.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 14-bit plus sign and overrange bit - delivers 32,768 distinct codes across ±VREF, with explicit overflow detection for signal integrity monitoring. |
| Linearity (INL) | ±0.05% FSR - ensures accurate representation of analog signals within ±1.2V differential or 0–1.5V single-ended ranges without post-conversion correction. |
| Supply Current | 640µA at VDD = 5.25V - enables operation in power-sensitive remote-sensing nodes with minimal thermal impact on precision analog front-ends. |
| Shutdown Current | 4µA - allows rapid entry into ultra-low-power state between measurements, extending battery life in portable instrumentation. |
| Conversion Rate | Up to 50 conversions/sec - supports real-time monitoring of slow-varying physical parameters like temperature or load cell output. |
| Power-Supply Rejection | 15 ppm - maintains accuracy despite ±5% variation in +5V rail, reducing need for ultra-stable LDOs in cost-sensitive designs. |
| 50/60Hz Rejection | Integrated digital filtering - suppresses mains-induced noise in industrial environments without external notch filters or software averaging. |
Pinout & Package
MAX111ACAP+ is housed in a 20-pin SSOP (Shrink Small Outline Package) with 0.65 mm pitch, optimized for compact PCB layouts while maintaining thermal and electrical performance in industrial ambient conditions.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN1+, IN1− | Differential Channel 1 Input | Accepts ±1.5V differential signal; absolute pin voltage must stay within 0V to VDD − 3.2V for valid conversion and ESD safety. |
| IN2+, IN2− | Differential Channel 2 Input | Second independent analog input pair; shares same reference and calibration as IN1±, enabling dual-sensor acquisition with matched gain/offset. |
| REF+, REF− | Reference Voltage Inputs | Set full-scale range: VREF = VREF+ − VREF−; typical 1.5V differential reference yields ±1.5V input range with guaranteed linearity. |
| VDD | Positive Supply | +5V nominal supply; operates over 4.75V to 5.25V; powers all analog and digital circuitry except RC oscillator when PDX = 1. |
| AGND | Analog Ground | Single-point return for analog inputs and reference; must be isolated from digital ground to prevent noise coupling into sigma-delta modulator. |
| CS | Chip Select | Active-low enable for serial interface; initiates conversion on rising edge when NO-OP = 1 in control word; must remain high during BUSY assertion. |
| SCLK | Serial Clock | TTL/CMOS-compatible clock (DC–2MHz); controls data shift-in/out timing; falling edge clocks DOUT, rising edge clocks DIN. |
| DIN / DOUT | Serial Data I/O | Full-duplex 16-bit interface: DIN loads control words (e.g., channel select, calibration mode); DOUT outputs conversion result and status bits (POL, OFL). |
| BUSY | Conversion Status Output | Open-drain active-low signal; goes low at conversion start and returns high upon completion; used for interrupt-driven µP synchronization. |
| RCSEL | Oscillator Mode Select | Connect to VDD to enable internal RC oscillator on XCLK; connect to GND to accept external clock - determines clock source for oversampling. |
| XCLK | Oversampling Clock I/O | Input for external clock or output for internal RC oscillator; requires ≤1MΩ pull-up/down resistor in RC mode to stabilize frequency. |
| N.C. | No Connect | Pins 4, 5, 14, 15 have no internal connection; must be left floating or tied to AGND for mechanical stability - not usable as grounds or bypass nodes. |
Key Features
| Feature | Design Value |
|---|---|
| Internal Auto-Calibration | Performs offset null and gain calibration under µP command - eliminates need for external trimpots or factory calibration steps in production test. |
| No External Components Required | Integrates precision voltage-to-current converter, integrator, comparator, and 1-bit DAC - reduces BOM count and layout area versus discrete sigma-delta implementations. |
| 50Hz/60Hz Rejection | Hardware-based digital filtering synchronized to oversampling clock - removes mains interference without firmware overhead or additional ADC samples. |
| Two Differential Input Channels | Independent IN1± and IN2± paths share reference and calibration - enables simultaneous measurement of two sensors (e.g., load cell + temperature) with matched accuracy. |
| SPI/QSPI/MICROWIRE Compatibility | Static 16-bit shift register with DC–2MHz SCLK - interfaces directly with common microcontroller peripherals without glue logic or level-shifting. |
Applications
| Panel Meters | Weigh Scales |
|---|---|
Use Scenario: Digital front-panel display in industrial control cabinets measuring voltage, current, or process variables. IC Role / Device Role / Timing Role: Primary ADC capturing analog sensor outputs at 10–50 Hz, providing ±14-bit resolution for 4½-digit display accuracy. Use Value: 0.05% linearity and 50/60Hz rejection ensure stable readings in electrically noisy plant-floor environments without software compensation. | Use Scenario: Load-cell signal conditioning in commercial and industrial weighing platforms. IC Role / Device Role / Timing Role: High-accuracy digitization of mV-level bridge outputs, supporting tare, zero, and span calibration via µP-controlled auto-null/gain routines. Use Value: Internal calibration eliminates manual potentiometer adjustments, reducing assembly time and improving long-term drift performance. |
| Temperature Measurement | Data-Acquisition Systems |
Use Scenario: Multi-sensor thermal monitoring in HVAC controllers or environmental test chambers. IC Role / Device Role / Timing Role: Dual-channel acquisition of thermistor or RTD bridge outputs, using one channel for sensor and another for cold-junction compensation. Use Value: Matched gain/offset tracking between IN1± and IN2± ensures consistent scaling across channels without per-channel calibration. | Use Scenario: Modular benchtop or embedded DAQ modules requiring configurable analog input resolution and sampling rate. IC Role / Device Role / Timing Role: Core ADC in scalable systems where conversion time (10.24–204.8 ms) and resolution are selected via control-word programming. Use Value: Programmable oversampling clock divider (÷1/÷2/÷4) and conversion time bits allow trade-off between speed and noise floor without hardware changes. |
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 differential channel switching; consumes 150µA active current. | Requires I²C host and lacks native 50/60Hz rejection - needs software filtering for AC-line noise suppression. | Preferred for space-constrained, low-power I²C systems where higher resolution offsets loss of hardware line-frequency rejection. |
| AD7705BRUZ | 16-bit sigma-delta ADC, SPI interface, 2-channel differential input, 1mW power at 1kHz output rate, ±0.003% INL. | Higher precision but slower max throughput (10Hz at 16-bit); requires external reference and has no auto-calibration sequence. | Chosen when sub-0.01% linearity is mandatory and system can accommodate external calibration or factory-trimmed references. |
Compared with ADS1115IDGSR and AD7705BRUZ, the MAX111ACAP+ offers unique value in cost-sensitive, mains-noise-prone applications where integrated 50/60Hz rejection, single-supply operation, and µP-controllable auto-calibration reduce firmware complexity and BOM cost - without requiring external reference or precision LDOs.
Availability
MAX111ACAP+ is available at Aetrix Electronics and suitable for panel meters, weigh scales, and temperature measurement systems requiring stable component supply, long-lifecycle availability, and traceable sourcing for industrial OEM programs.
Supply support for MAX111ACAP+ 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 product line was engineered for high-resolution, low-power, serial-output data acquisition in cost-sensitive instrumentation - emphasizing integrated calibration, noise immunity, and minimal external component count.
FAQ
What is the maximum input voltage range supported by the MAX111ACAP+?
The MAX111ACAP+ supports differential analog inputs from ±1.5V (with VREF+ = 1.5V, VREF− = 0V) or single-ended inputs from 0V to +1.5V. Absolute voltage at any analog input pin must remain within 0V to VDD − 3.2V (i.e., 0V to +1.75V at VDD = 5V). Exceeding these limits risks damage or invalid conversion results. The MAX111ACAP+ does not support bipolar supplies like the MAX110 series.
Does the MAX111ACAP+ require external calibration components?
No, the MAX111ACAP+ performs internal auto-calibration for both offset and gain errors under microprocessor control - requiring no external resistors, capacitors, or trimmers. Calibration is initiated via the CAL bit in the control word, and results are stored in on-chip registers. This eliminates manual calibration steps and improves production yield for the MAX111ACAP+ in volume manufacturing.
How does the MAX111ACAP+ achieve 50Hz and 60Hz rejection?
The MAX111ACAP+ achieves hardware-based 50Hz/60Hz rejection through synchronized digital filtering in its sigma-delta modulator - leveraging precise oversampling clock division (÷1/÷2/÷4) and fixed conversion timing (e.g., 102,400 clock cycles per conversion at ÷2 mode). This built-in rejection operates independently of firmware and requires no software averaging, making it effective even in µP-constrained systems using the MAX111ACAP+.
Can the MAX111ACAP+ operate with an external crystal or precision clock source?
Yes, the MAX111ACAP+ accepts an external TTL/CMOS-compatible clock on the XCLK pin when RCSEL is tied to GND. In this mode, the internal RC oscillator is disabled, and the external clock directly drives the oversampling engine. Supported frequencies range from 250kHz to 1.25MHz (per datasheet), allowing synchronization to system clocks or precision oscillators - enhancing timing determinism in multi-ADC or time-critical MAX111ACAP+ deployments.
What is the function of the OFL (overrange) bit in the MAX111ACAP+ output word?
The OFL bit in the MAX111ACAP+ 16-bit serial output indicates whether the input voltage exceeded the reference range (±VREF). It is asserted when |VIN| > VREF, providing early warning of signal saturation before full-scale overflow occurs. The MAX111ACAP+ continues converting accurately up to ~1.2×VREF, but linearity is not guaranteed beyond VREF; thus, the OFL bit enables real-time range management in closed-loop systems using the MAX111ACAP+.
MAX111ACAP+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 20-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tube
- 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:
- 20-SSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX111ACAP+ FAQ
1.How can I place an order for MAX111ACAP+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX111ACAP+ 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 MAX111ACAP+ reliable?
The price and inventory of MAX111ACAP+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX111ACAP+ is usually 5 days.
3.What payment methods are accepted for MAX111ACAP+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX111ACAP+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX111ACAP+?
MAX111ACAP+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX111ACAP+ 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 MAX111ACAP+?
For technical support, including MAX111ACAP+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX111ACAP+ requirements.
6.How does Aetrix verify that MAX111ACAP+ is sourced from the original manufacturer or authorized distributors?
All MAX111ACAP+ 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 MAX111ACAP+ meets industry standards.
7.What is the process for return or replacement of MAX111ACAP+?
All MAX111ACAP+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX111ACAP+, 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 MAX111ACAP+ part is unused and in its original packaging.
Return procedure for MAX111ACAP+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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