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Analog Devices Inc./Maxim Integrated MAX111BCAP+T
- Part No.:
- MAX111BCAP+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
MAX111BCAP+T.pdf
- Description:
- IC ADC 14BIT SIGMA-DELTA 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,572
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Product details
Overview
MAX111BCAP+T from Maxim Integrated is a ±14-bit, 2-channel sigma-delta analog-to-digital converter (ADC) operating from a single +5V supply, delivering 0.05% INL, 640µA active current, and 50Hz/60Hz rejection for precision low-frequency measurement. It supports differential inputs (±1.5V range) or single-ended inputs (0V to +1.5V), features auto-calibration, and targets battery-powered industrial data acquisition.
For engineers reviewing the MAX111BCAP+T datasheet, MAX111BCAP+T pinout, MAX111BCAP+T application, or MAX111BCAP+T equivalent, this page delivers verified electrical specs, SSOP-20 pin mapping, real-world use cases in weigh scales and panel meters, and two validated alternative ADCs with documented functional and application-level differences.
Technical Context
The MAX111BCAP+T implements a first-order sigma-delta modulator with internal voltage-to-current conversion, integrator, comparator, 1-bit DAC, and 16-bit up/down counter. Its oversampling clock (fOSC) is programmable via divide-by-1/2/4 control bits and sourced either from an external TTL/CMOS clock or an internal RC oscillator (enabled by RCSEL = VDD).
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 uses a fully static 16-bit I/O shift register compatible with SPI, QSPI (CPHA=0, CPOL=0), and MICROWIRE interfaces, with CS-controlled start and BUSY-synchronized readout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 14-bit + sign + overrange (16-bit serial output); enables ±16,383-count measurement with overflow detection |
| INL (Differential) | ±0.05% FSR at TA = 0°C to +70°C; ensures ≤±8 LSB error across full ±1.5V input span |
| Supply Current | 640 µA typical at VDD = 5V; supports low-power remote sensing without external regulators |
| Power-Down Current | 4 µA with PD = 1 and PDX = 1; extends battery life in intermittent-read applications |
| Conversion Rate | Up to 50 conversions/sec (20.48 ms min. time); sufficient for slow-varying sensor signals like load cells or RTDs |
| AC Rejection | 50 Hz / 60 Hz notch; eliminates mains interference in industrial environments without external filters |
| Reference Input | Differential: VREF+ = 1.5V, VREF− = 0V; defines full-scale range and enables ratiometric measurement |
Pinout & Package
MAX111BCAP+T is housed in a 20-pin shrink small-outline package (SSOP) with 0.65 mm pitch, 7.2 mm × 5.3 mm body size, and exposed pad for thermal enhancement. Pin numbering follows standard SSOP top-view orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 20 | IN1+, IN1− | Differential channel 1 analog inputs; accept ±1.5V differential or 0–1.5V single-ended (IN1− = AGND) |
| 2, 19 | IN2+, IN2− | Differential channel 2 analog inputs; identical electrical specs and routing rules as IN1± |
| 3 | REF+ | Positive reference input; sets upper bound of differential input range (e.g., 1.5V for ±1.5V full scale) |
| 4 | REF− | Negative reference input; tied to AGND for single-ended mode or used for true differential reference |
| 5 | CS | Chip-select input; falling edge initiates serial transfer; rising edge (with NO-OP = 1) starts conversion |
| 6 | RCSEL | Oversampling clock source select; VDD enables internal RC oscillator, GND selects external XCLK |
| 7 | SCLK | Serial clock input; DC–2 MHz compatible; controls timing of DIN/DOUT bit transfers |
| 8 | DIN | Serial data input; loads 16-bit control word (NO-OP, CONV bits, CAL, PD, etc.) on SCLK rising edge |
| 9 | DOUT | Serial data output; shifts out 16-bit result (POL, OFL, D13–D0) on SCLK falling edge; high-Z when CS = high |
| 10 | BUSY | Open-drain status output; low during conversion; used for interrupt-driven or polling-based readout |
| 11 | VDD | +5V power supply pin; must be decoupled locally (0.1 µF ceramic + 10 µF tantalum) |
| 12 | AGND | Analog ground; separate return path for analog inputs and reference; connects to system AGND plane |
| 13 | XCLK | Oversampling clock I/O; driven by internal RC oscillator (RCSEL = VDD) or accepts external clock (RCSEL = GND) |
| 14–15 | N.C. | No internal connection; must remain unconnected per datasheet; not usable for routing or grounding |
| 16–18 | GND, VSS (N/A), N.C. | Pin 16 = digital ground (GND); MAX111 has no VSS pin-only VDD and AGND; pins 17–18 unused |
Key Features
| Feature | Design Value |
|---|---|
| Single +5V operation | Eliminates need for dual ±5V supplies-reduces BOM count and PCB area in portable instruments |
| Auto-calibration mode | Enables offset/gain correction under µP control without external trim components or factory calibration |
| Two differential input channels | Allows simultaneous or alternating measurement of two sensors (e.g., load cell + temperature reference) |
| No external components required | Full functionality achieved with only decoupling caps-no op-amps, filters, or reference buffers needed |
| 50Hz/60Hz rejection | Hardware-level line-frequency noise suppression-avoids software averaging or external notch filters |
Applications
| Industrial Weigh Scales | Panel Meters |
|---|---|
|
Use Scenario: High-precision weighing of industrial batches using strain-gauge load cells with mV-level outputs. IC Role / Device Role / Timing Role: Primary ADC digitizing differential bridge outputs; performs auto-zero and gain calibration before each weight reading. Use Value: ±0.05% INL and 50Hz rejection ensure stable readings in electrically noisy factory floors without shielding or post-processing. |
Use Scenario: Front-panel voltage/current display in programmable power supplies or test equipment. IC Role / Device Role / Timing Role: Dual-channel monitor converting sensed output and reference voltages for real-time error calculation. Use Value: 640µA supply current and 4µA shutdown enable always-on displays with minimal standby power draw. |
| Data-Acquisition Systems | Temperature Measurement |
|
Use Scenario: Modular DAQ modules acquiring slow-varying sensor data (pressure, humidity, pH) in environmental monitoring. IC Role / Device Role / Timing Role: Low-noise, low-drift ADC interfacing to multiplexed sensor front-ends via SPI-compatible serial bus. Use Value: Internal sigma-delta architecture provides inherent noise shaping-enabling >85 dB SNR without external anti-aliasing filters. |
Use Scenario: Precision thermistor or RTD measurement in HVAC controllers and medical devices. IC Role / Device Role / Timing Role: Digitizes ratiometric bridge outputs referenced to internal 1.5V reference; rejects common-mode drift. Use Value: Differential input range (±1.5V) and 0.05% INL support <0.1°C resolution over −40°C to +85°C ambient. |
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 | 4-channel, I²C interface, 16-bit resolution, 860µA active current, no internal oscillator | Requires external clock source and I²C host; better channel count but higher power and no 50/60Hz rejection | Choose for multi-sensor systems needing I²C simplicity and higher resolution; avoid where mains noise immunity is critical |
| AD7730BRUZ | 2-channel, 24-bit sigma-delta, SPI interface, 1.2mA active current, integrated PGA and reference | Higher resolution and built-in gain stages-but larger footprint (24-TSSOP), higher cost, and no auto-calibration mode | Choose for ultra-high-precision applications requiring >16-bit ENOB; not suitable for space-constrained or low-power designs |
Compared with ADS1115IDGSR and AD7730BRUZ, the MAX111BCAP+T offers unique 50/60Hz rejection, lowest active current among ±14-bit alternatives, and on-chip auto-calibration-making it optimal for cost-sensitive, noise-prone, battery-operated instrumentation where 14-bit fidelity suffices.
Availability
MAX111BCAP+T is available at Aetrix Electronics and suitable for industrial weigh scales, panel meters, and temperature measurement systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for MAX111BCAP+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 resource-constrained systems-emphasizing self-calibration, low power, and robust serial interfacing without external support components.
FAQ
What is the operating temperature range for MAX111BCAP+T?
The MAX111BCAP+T is specified for 0°C to +70°C ambient operation, matching the 'C' grade suffix in its ordering code. This range covers commercial and light-industrial environments. For extended temperature operation, the MAX111E variant (−40°C to +85°C) is available-but MAX111BCAP+T itself is not rated beyond +70°C.
Does MAX111BCAP+T support single-ended input configurations?
Yes, MAX111BCAP+T supports single-ended operation on both channels: tie IN1− or IN2− to AGND, apply 0V to +1.5V signal to IN1+ or IN2+, and configure REF− to AGND. Single-ended INL is ±0.25% FSR-higher than differential mode-but still suitable for many sensor interfaces.
How does the auto-calibration mode work in MAX111BCAP+T?
Auto-calibration in MAX111BCAP+T is initiated by setting the CAL bit in the control word. It performs internal offset nulling and gain adjustment using on-chip references-requiring no external components or µP computation. Calibration completes within one conversion cycle and updates internal DAC coefficients.
Can MAX111BCAP+T interface directly with an Arduino or STM32 MCU?
Yes, MAX111BCAP+T is SPI-compatible (CPHA=0, CPOL=0) and works with Arduino (using SPI library) and STM32 (via HAL_SPI_TransmitReceive). Key requirements: drive CS low before SCLK, sample DOUT on SCLK rising edge, and poll BUSY or use it as interrupt-no special level-shifting needed for 3.3V/5V logic.
What is the purpose of the OFL (overrange) bit in MAX111BCAP+T output?
The OFL bit in MAX111BCAP+T output indicates whether the input voltage exceeded ±VREF (±1.5V). It is set before hard saturation-typically at ±1.8V-allowing firmware to detect overload conditions early and trigger range-switching or alert logic without losing measurement validity.
MAX111BCAP+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 20-SSOP (0.209", 5.30mm 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:
- 20-SSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX111BCAP+T FAQ
1.How can I place an order for MAX111BCAP+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX111BCAP+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 MAX111BCAP+T reliable?
The price and inventory of MAX111BCAP+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX111BCAP+T is usually 5 days.
3.What payment methods are accepted for MAX111BCAP+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX111BCAP+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX111BCAP+T?
MAX111BCAP+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX111BCAP+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 MAX111BCAP+T?
For technical support, including MAX111BCAP+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX111BCAP+T requirements.
6.How does Aetrix verify that MAX111BCAP+T is sourced from the original manufacturer or authorized distributors?
All MAX111BCAP+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 MAX111BCAP+T meets industry standards.
7.What is the process for return or replacement of MAX111BCAP+T?
All MAX111BCAP+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX111BCAP+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 MAX111BCAP+T part is unused and in its original packaging.
Return procedure for MAX111BCAP+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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