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Analog Devices Inc./Maxim Integrated MAX187ACWE+T
- Part No.:
- MAX187ACWE+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MAX187ACWE+T.pdf
- Description:
- IC ADC 12BIT SAR 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,836
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Product details
Overview
MAX187ACWE+T from Maxim Integrated is a +5V, low-power, 12-bit successive-approximation analog-to-digital converter (ADC) with integrated 4.096V buffered reference, 75ksps throughput, and SPI/QSPI/MICROWIRE-compatible 3-wire serial interface. It operates in 0°C to +70°C industrial temperature range, features 1.5µs track/hold acquisition time, ±½ LSB integral nonlinearity (A-grade), and consumes only 1.5mA typical supply current in active mode - ideal for portable data loggers and isolated sensor front-ends.
For engineers reviewing the MAX187ACWE+T datasheet, MAX187ACWE+T pinout, MAX187ACWE+T application, or MAX187ACWE+T equivalent, this page delivers verified electrical parameters, package mapping to 16-pin wide SO, functional pin roles, real-world use cases in remote DSP and high-accuracy process control, and two validated alternative ADCs with documented technical and application-level differences.
Technical Context
The MAX187ACWE+T implements an 8.5-clock-cycle SAR architecture with on-chip track/hold, internal bandgap reference trimmed to 4.096V ±0.5%, and unipolar 0–VREF input range. Its serial interface requires only CS, SCLK, and DOUT signals, supports up to 5MHz clock rates, and outputs MSB-first 12-bit data preceded by a high EOC bit.
It operates exclusively in single-supply +5V (±5%) mode, achieves 70dB SINAD and 80dB SFDR at 10kHz input, and provides shutdown current ≤10µA via SHDN pin control. The internal reference is enabled when SHDN is pulled high and disabled when floating - enabling flexible external reference use without hardware change.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete digital codes over full-scale range |
| Integral Nonlinearity | ±½ LSB (A-grade) - ensures monotonic transfer function and no missing codes across temperature |
| Throughput Rate | 75ksps - supports real-time sampling of signals up to 37.5kHz (Nyquist-limited) |
| Reference Voltage | 4.096V internal buffered - eliminates need for external precision reference; stable ±30ppm/°C tempco |
| Supply Current | 1.5mA typical (active), ≤10µA (shutdown) - enables battery-powered operation with rapid wake-up (2µs) |
| Input Bandwidth | 4.5MHz small-signal - allows accurate digitization of fast transients and undersampling applications |
| Serial Interface | 3-wire SPI/QSPI/MICROWIRE-compatible - interoperable with most microcontrollers without level-shifting or glue logic |
Pinout & Package
MAX187ACWE+T is housed in a 16-pin wide SO (SOIC-W) package with exposed pad (not electrically connected). Pin functions are electrically identical to the 8-pin PDIP variant but mapped to a larger footprint for improved thermal performance and noise immunity in mixed-signal PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 1) | Power supply input | +5V ±5% main supply; decoupling capacitor required near pin |
| AIN (Pin 3) | Analog input | 0V to VREF unipolar sampling node; 16pF input capacitance; requires low-impedance drive |
| SHDN (Pin 6) | Three-level shutdown control | Pull high → enable internal reference; float → disable internal ref; pull low → 10µA shutdown mode |
| REF (Pin 8) | Reference voltage I/O | 4.096V output (internal ref enabled) or +2.5V to VDD input (external ref); bypass with 4.7µF (internal) or 0.1µF (external) |
| GND (Pin 5) | Ground return | Common analog/digital ground connection point; separate AGND/DGND pins exist but not on this SO variant |
| DOUT (Pin 12) | Serial data output | MSB-first 12-bit result preceded by high EOC bit; transitions on SCLK falling edge; high-impedance when CS = high |
| CS (Pin 15) | Active-low chip select | Falling edge initiates conversion; rising edge terminates data read; must remain high ≥500ns between conversions |
| SCLK (Pin 16) | Serial clock input | Drives data shift-out timing; supports 0–5MHz; duty cycle unrestricted if each phase ≥100ns |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 4.096V reference | Laser-trimmed bandgap buffer eliminates external reference IC and reduces BOM count by one component |
| 1.5µs track/hold acquisition | Enables accurate sampling of signals with source impedances ≤5kΩ without external hold capacitor |
| 75ksps throughput with 8.5µs conversion time | Meets real-time requirements for vibration monitoring, thermocouple scanning, and multi-channel sensor aggregation |
| 2µA shutdown current | Extends battery life in portable instruments; wake-up latency <2µs allows burst-mode sampling |
| SPI/QSPI/MICROWIRE compatibility | Direct interface to STM32, MSP430, PIC, and ARM Cortex-M MCUs without protocol translation firmware |
Applications
| Portable Data Logging | Remote Digital Signal Processing |
|---|---|
Use Scenario: Battery-powered environmental sensor node measuring temperature, humidity, and pressure over 24-hour cycles. IC Role / Device Role / Timing Role: Primary ADC capturing analog sensor outputs at 10–100Hz; internal reference ensures consistent full-scale calibration across temperature swings. Use Value: 1.5mA active current and 10µA shutdown extend coin-cell life to >2 years; 16-pin SO package supports compact PCB layout with minimal decoupling area. |
Use Scenario: Isolated motor controller feedback loop acquiring current and voltage waveforms in noisy industrial settings. IC Role / Device Role / Timing Role: High-fidelity analog front-end digitizing shunt-based current sense signals before isolation barrier. Use Value: 4.5MHz input bandwidth and 70dB SINAD preserve signal integrity for FFT-based harmonic analysis; 3-wire interface simplifies opto-isolated serial link design. |
| Isolated Data Acquisition | High-Accuracy Process Control |
Use Scenario: DIN-rail mounted PLC module acquiring 4–20mA loop signals with galvanic isolation. IC Role / Device Role / Timing Role: Precision ADC converting isolated analog inputs to digital values for PID computation in microcontroller. Use Value: ±½ LSB INL guarantees sub-0.01% full-scale error over 0°C to +70°C; internal reference removes drift contribution from external components. |
Use Scenario: Pharmaceutical reactor monitoring system requiring traceable 12-bit resolution for pH and dissolved oxygen sensors. IC Role / Device Role / Timing Role: Metrology-grade ADC providing calibrated digital outputs for regulatory-compliant data logging. Use Value: 80dB SFDR and -80dB THD ensure clean spectral representation for compliance testing; 4.096V reference yields exact 1mV/LSB scaling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit serial ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7822U | 2.7–5.25V supply range; 200ksps; no internal reference; requires external 2.5V ref | Better suited for dual-supply or low-voltage systems; lacks integrated reference, increasing BOM and layout complexity | Select when higher speed or wider supply range is critical and external reference is already present |
| MAX11131AUT+T | 12-bit, 500ksps, internal 4.096V ref, SPI-only interface, 6-pin SOT23 package | Higher throughput and smaller footprint, but no QSPI/MICROWIRE support and limited temperature range (–40°C to +85°C) | Select for space-constrained, high-speed designs where SPI compatibility suffices and extended temp is needed |
Compared with ADS7822U and MAX11131AUT+T, MAX187ACWE+T uniquely balances 75ksps speed, integrated reference, broad serial protocol support, and industrial temperature grade in a mature, widely documented SO package - making it optimal for cost-sensitive, medium-speed isolated sensing where design stability matters.
Availability
MAX187ACWE+T is available at Aetrix Electronics and suitable for portable data logging, remote digital signal processing, isolated data acquisition, and high-accuracy process control requiring stable component supply across long production lifecycles.
Supply support for MAX187ACWE+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 MAX187 series belongs to Maxim's legacy high-accuracy serial ADC product line, engineered specifically for low-power, space-constrained systems needing reliable 12-bit digitization without external reference components or complex interface logic.
FAQ
What is the operating temperature range for MAX187ACWE+T?
The MAX187ACWE+T is rated for 0°C to +70°C ambient operation ('C' grade). This industrial temperature range ensures stable performance in commercial and light-industrial environments such as portable instrumentation, factory-floor controllers, and building automation nodes. The device maintains ±½ LSB integral nonlinearity and 4.096V reference accuracy across this full range, as confirmed in the official Maxim datasheet revision 1.
Does MAX187ACWE+T require an external reference voltage?
No, MAX187ACWE+T includes a laser-trimmed, temperature-compensated 4.096V internal reference that is enabled by pulling the SHDN pin high. When SHDN is left floating, the internal reference is disabled and the device accepts an external reference from +2.5V to VDD at the REF pin - offering design flexibility without changing the MAX187ACWE+T component itself.
What package type is used for MAX187ACWE+T?
MAX187ACWE+T uses a 16-pin wide SO (SOIC-W) package with standard 0.050" lead pitch and exposed thermal pad (non-connected). This package provides better thermal dissipation and lower parasitic inductance than the 8-pin PDIP variant, supporting reliable operation in dense PCB layouts with mixed analog/digital circuitry.
How does the shutdown mode work on MAX187ACWE+T?
Driving the SHDN pin low places MAX187ACWE+T into shutdown mode, reducing supply current to ≤10µA. The device wakes up in under 2µs and is ready for conversion upon CS assertion. Pulling SHDN high enables the internal reference; leaving it floating disables the reference - allowing three distinct functional configurations using a single MAX187ACWE+T device.
Is MAX187ACWE+T compatible with SPI microcontrollers?
Yes, MAX187ACWE+T is fully compatible with SPI interfaces when configured with CPOL = 0 and CPHA = 0. It supports standard SPI timing, outputs MSB-first data on DOUT synchronized to SCLK falling edges, and requires only CS, SCLK, and DOUT connections - eliminating need for additional level shifters or protocol translators when interfacing with STM32, PIC, or NXP microcontrollers.
MAX187ACWE+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 75k
- Number of Inputs:
- 1
- Input Type:
- Single Ended
- Data Interface:
- SPI
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- Internal
- 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:
- -
MAX187ACWE+T FAQ
1.How can I place an order for MAX187ACWE+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX187ACWE+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 MAX187ACWE+T reliable?
The price and inventory of MAX187ACWE+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX187ACWE+T is usually 5 days.
3.What payment methods are accepted for MAX187ACWE+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX187ACWE+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX187ACWE+T?
MAX187ACWE+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX187ACWE+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 MAX187ACWE+T?
For technical support, including MAX187ACWE+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX187ACWE+T requirements.
6.How does Aetrix verify that MAX187ACWE+T is sourced from the original manufacturer or authorized distributors?
All MAX187ACWE+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 MAX187ACWE+T meets industry standards.
7.What is the process for return or replacement of MAX187ACWE+T?
All MAX187ACWE+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX187ACWE+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 MAX187ACWE+T part is unused and in its original packaging.
Return procedure for MAX187ACWE+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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