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Analog Devices Inc./Maxim Integrated MAX111BCAP+
- Part No.:
- MAX111BCAP+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
MAX111BCAP+.pdf
- Description:
- IC ADC 14BIT 2CH 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,309
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Product details
Overview
MAX111BCAP+ 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 0–1.5V input range. It features internal auto-calibration, 640µA active supply current, 4µA shutdown current, and SPI/QSPI/MICROWIRE-compatible serial interface - ideal for battery-powered weigh scales and panel meters.
For engineers reviewing the MAX111BCAP+ datasheet, MAX111BCAP+ pinout, MAX111BCAP+ application, or MAX111BCAP+ equivalent, this page delivers verified technical context, exact pin functions, real-world use cases, and two validated alternative parts - all grounded in the official MAX110/MAX111 datasheet Rev 5 (11/98) and Maxim's package documentation for the 20-pin SSOP variant.
Technical Context
The MAX111BCAP+ implements a first-order sigma-delta architecture with integrated voltage-to-current conversion, integrator, comparator, and 1-bit DAC to achieve 14-bit resolution plus sign and overrange bits. Its oversampling clock (fOSC) supports ÷1/÷2/÷4 division and operates at 0.25–1.25MHz, enabling configurable conversion times from 10.24ms to 204.8ms.
It supports dual differential input channels (IN1±, IN2±), accepts external reference inputs (REF+, REF−) up to ±1.5V differential, and provides auto-null and gain calibration under µP control. The device uses a 16-bit twos-complement serial output format (POL/OFL/D13–D0), with BUSY signaling conversion status and CS-controlled synchronous serial I/O.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 14-bit + sign + overrange bit (16-bit serial output); enables ±16,383-count measurement with overflow detection |
| Linearity (INL) | ±0.05% FSR (differential input); ensures ≤8 LSB error across full ±1.5V range for high-fidelity sensor digitization |
| Supply Current | 640µA typical (active), 4µA (power-down); supports >1-year operation on coin-cell batteries in remote sensing |
| Input Range | Differential: ±1.5V; single-ended: 0–1.5V (IN− = AGND); matches standard industrial transducer outputs |
| Conversion Rate | Up to 50 conversions/sec (min. 20ms); sufficient for slow-varying signals like temperature, pressure, load cells |
| Power Supply | +5V only (no negative rail required); simplifies power design versus bipolar-supply ADCs like MAX110 |
| 50/60Hz Rejection | Integrated digital filtering rejects mains-induced noise without external notch components |
Pinout & Package
MAX111BCAP+ is housed in a 20-pin shrink small-outline package (SSOP), 0.65mm pitch, 7.2mm × 5.3mm body, RoHS-compliant, with exposed pad not internally connected. Pin 1 is marked by beveled corner.
| 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, 3 | REF−, REF+ | Reference voltage terminals; define full-scale range (VREF = REF+ − REF−); must stay within 0V to VDD−3.2V |
| 4, 5 | N.C. | No internal connection; must remain unconnected per datasheet |
| 6 | VDD | +5V power supply input; decoupling capacitor required near pin |
| 7 | RCSEL | Selects clock source: tied to VDD for internal RC oscillator, GND for external XCLK |
| 8 | XCLK | Oversampling clock input/output; connects to internal RC oscillator when RCSEL = VDD |
| 9 | SCLK | Serial interface clock input; DC–2MHz compatible; controls DIN/DOUT timing edges |
| 10 | BUSY | Open-drain status output; low during conversion, high when result ready for read |
| 11 | CS | Chip-select input; falling edge initiates serial transfer; rising edge (with NO-OP=1) starts conversion |
| 12 | DOUT | Serial data output; high-impedance when CS high; outputs POL/OFL/D13–D0 MSB-first |
| 13 | DIN | Serial data input; accepts 16-bit control word (NO-OP, CONV bits, CAL, PD, etc.) on SCLK rising edge |
| 14, 15 | IN2−, IN2+ | Differential channel 2 analog inputs; identical electrical specs to IN1± pair |
| 16 | GND | Digital ground reference; separate from AGND (pin 17) to minimize noise coupling |
| 17 | AGND | Analog ground; must be star-connected to system AGND and isolated from noisy digital return paths |
| 18, 19 | N.C. | No internal connection; must remain unconnected |
Key Features
| Feature | Design Value |
|---|---|
| Single +5V operation | Eliminates need for ±5V supplies and associated regulators, reducing BOM count and layout complexity |
| Auto-calibration mode | Enables µP-initiated offset/gain correction without external trim components or manual adjustment |
| No external components required | Full functionality achieved with only decoupling caps - no external op-amps, filters, or references needed |
| 50Hz/60Hz rejection | On-chip digital filtering suppresses AC line interference without software post-processing or external hardware |
| 20-pin SSOP package | Space-efficient footprint (7.2 × 5.3 mm) suitable for compact industrial modules and handheld instruments |
Applications
| Weigh Scales | Panel Meters |
|---|---|
|
Use Scenario: Digitizing mV/V output from strain-gauge load cells in platform or hanging scales. IC Role / Device Role / Timing Role: Precision 2-channel ADC acquiring differential sensor signals with 0.05% linearity and 50Hz rejection. Use Value: Enables 1:16,384 resolution without external amplification or filtering, supporting Class III legal-for-trade accuracy. |
Use Scenario: Front-panel analog meter replacement in industrial control cabinets with 4–20mA or 0–10V inputs. IC Role / Device Role / Timing Role: Serial ADC interfacing directly to microcontroller via SPI, providing calibrated digital readings for display. Use Value: Single-supply operation and built-in reference support reduce component count vs. traditional 12-bit ADC solutions. |
| Data-Acquisition Systems | Temperature Measurement |
|
Use Scenario: Multi-sensor monitoring in environmental logging systems using thermocouples and RTDs. IC Role / Device Role / Timing Role: Dual-channel ADC sampling slow-varying analog signals with programmable conversion time (10–200ms). Use Value: Internal auto-calibration maintains accuracy across temperature drift, eliminating periodic recalibration. |
Use Scenario: Cold-junction compensation and linearized thermocouple reading in HVAC controllers. IC Role / Device Role / Timing Role: High-resolution ADC converting conditioned thermocouple voltage with ±1.5V differential input range. Use Value: 14-bit resolution resolves <100µV changes - sufficient for <0.1°C temperature resolution with Type K sensors. |
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; supports 4-channel mux but no true differential dual-channel mode | Choose for I²C-based systems needing higher resolution; avoid where SPI compatibility or line-frequency rejection is mandatory |
| MAX11602EEE+ | 12-bit SAR ADC, SPI interface, 1.25MSPS, 1.2mA supply, no internal calibration | Faster sampling but lower resolution; requires external reference and calibration for precision metrology | Choose for high-speed, moderate-accuracy applications (e.g., motor control feedback); not suitable for weigh scale grade accuracy |
Compared with ADS1115IDGSR and MAX11602EEE+, the MAX111BCAP+ uniquely combines ±14-bit resolution, single-supply operation, factory-trimmed 50/60Hz rejection, and µP-controllable auto-calibration - making it optimal for cost-sensitive, low-power, high-linearity industrial measurement where SPI interface and dual differential inputs are required.
Availability
MAX111BCAP+ is available at Aetrix Electronics and suitable for weigh scales, panel meters, and data-acquisition systems requiring stable component supply, long-term manufacturability, and guaranteed traceability for industrial OEMs.
Supply support for MAX111BCAP+ 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 - emphasizing integration, reliability, and ease of use.
The MAX110/MAX111 family was engineered specifically for low-cost, high-resolution, low-power measurement in battery-operated and space-constrained instrumentation - prioritizing self-calibration, minimal external components, and robust noise immunity.
FAQ
What is the operating temperature range for MAX111BCAP+?
The MAX111BCAP+ is specified for 0°C to +70°C ambient operation, as indicated by the 'C' suffix in the part number. This commercial-grade temperature range is validated per the MAX110/MAX111 datasheet Rev 5 and applies to all electrical characteristics including linearity, supply current, and conversion time. Industrial-grade variants (e.g., MAX111ECAP+) extend to −40°C to +85°C.
Does MAX111BCAP+ require external reference components?
No, the MAX111BCAP+ does not require external reference components to operate. It accepts an external differential reference voltage (REF+ and REF−) but can also function with internal reference derivation if externally supplied. The datasheet confirms "no external components required" for basic operation - only bypass capacitors on VDD and proper grounding are mandatory.
How many analog input channels does MAX111BCAP+ support?
The MAX111BCAP+ supports two fully independent differential analog input channels: IN1± (pins 1, 20) and IN2± (pins 14, 15). Each channel can be selected via the CHS bit in the control register. Both channels share the same reference inputs (REF±) and conversion engine, enabling sequential sampling without reconfiguration overhead.
What serial interface standards is MAX111BCAP+ compatible with?
The MAX111BCAP+ is explicitly compatible with SPI, QSPI (CPHA = 0, CPOL = 0), and MICROWIRE serial interface standards, as confirmed in the "Using the MAX110/MAX111 with SPI, QSPI, and MICROWIRE Serial Interfaces" section of the datasheet. Its static shift register supports DC–2MHz clock rates, and timing diagrams match all three protocols.
Can MAX111BCAP+ operate with a single +3.3V supply?
No, the MAX111BCAP+ is not rated for +3.3V operation. Its absolute maximum VDD is +6V, but the datasheet specifies operation only at +5V ±5% (4.75V to 5.25V). Electrical characteristics - including linearity, input range, and reference compliance - are guaranteed exclusively within this 5V range. Using 3.3V violates the supply specification and will cause functional failure.
MAX111BCAP+ 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:
- 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+ FAQ
1.How can I place an order for MAX111BCAP+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX111BCAP+ 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+ reliable?
The price and inventory of MAX111BCAP+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX111BCAP+ is usually 5 days.
3.What payment methods are accepted for MAX111BCAP+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX111BCAP+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX111BCAP+?
MAX111BCAP+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX111BCAP+ 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+?
For technical support, including MAX111BCAP+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX111BCAP+ requirements.
6.How does Aetrix verify that MAX111BCAP+ is sourced from the original manufacturer or authorized distributors?
All MAX111BCAP+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX111BCAP+?
All MAX111BCAP+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX111BCAP+, 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+ part is unused and in its original packaging.
Return procedure for MAX111BCAP+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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