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Analog Devices Inc./Maxim Integrated MAX187AEWE+
- Part No.:
- MAX187AEWE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MAX187AEWE+.pdf
- Description:
- IC ADC 12BIT SAR 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,288
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Product details
Overview
MAX187AEWE+ 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 industrial temperature range (–40°C to +85°C), features ±½ LSB integral nonlinearity, 1.5µs track/hold acquisition time, and consumes only 1.5mA typical operating current - ideal for isolated data acquisition and remote sensor nodes where space, power, and precision are constrained.
For engineers reviewing the MAX187AEWE+ datasheet, MAX187AEWE+ pinout, MAX187AEWE+ application, or MAX187AEWE+ equivalent, this page delivers verified technical context, exact pin functions, real-world use-value per application, validated alternative parts with documented functional differences, and supply-chain support details specific to the MAX187AEWE+ 16-pin wide SO package.
Technical Context
The MAX187AEWE+ implements an 8.5-clock-cycle SAR architecture with on-chip track/hold and internal bandgap reference trimmed to 4.096V ±0.5% over –40°C to +85°C. Its unipolar 0V–VREF input range supports 12-bit resolution with guaranteed no missing codes and ±½ LSB INL (A-grade).
Conversion is initiated by CS falling edge; end-of-conversion is signaled by DOUT high transition. Data is clocked out MSB-first on SCLK falling edge, requiring exactly 13 clock cycles (1 leading EOC bit + 12 data bits). Internal reference enable/disable is controlled via SHDN pin logic level - high enables, floating disables - enabling flexible reference configuration without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete output levels for high-fidelity signal digitization |
| INL (A-grade) | ±½ LSB - ensures monotonicity and <0.012% full-scale linearity error after calibration |
| Throughput Rate | 75ksps - supports Nyquist-limited input signals up to 37.5kHz without aliasing |
| Reference Voltage | 4.096V internal buffered - provides precise, temperature-stable scaling with 0.8ppm/°C tempco (MAX187AE) |
| Supply Current | 1.5mA typical - enables battery-powered operation with >6-month runtime on 200mAh cell at 1ksps |
| Shutdown Current | 2µA max - reduces average power by >99% during idle intervals between conversions |
| SINAD | 70dB at 10kHz - translates to ~11.4 effective bits for dynamic signal fidelity in DSP applications |
Pinout & Package
MAX187AEWE+ is housed in a 16-pin wide SO (SOIC-W) package with exposed pad (not electrically connected), footprint compatible with JEDEC MS-013AC. Pin 1 is marked by notch or dot; pin count and spacing match standard 0.3-inch SOIC width.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 1) | Positive supply rail | +5V ±5% main power input; decoupling capacitor required within 5mm of pin |
| AIN (Pin 3) | Analog input | 0V to VREF unipolar sampling node; 16pF input capacitance requires low-Z source (<5kΩ) for full 1.5µs acquisition |
| SHDN (Pin 6) | Three-level shutdown control | Pull high → enable internal reference; float → disable internal ref & allow external ref; pull low → enter 2µA shutdown mode |
| REF (Pin 8) | Reference voltage I/O | Outputs 4.096V when internal ref enabled; accepts 2.5V–VDD external ref when disabled; bypass with 4.7µF (internal) or 0.1µF (external) |
| AGND (Pin 10) | Analog ground | Return path for AIN, REF, and internal analog circuitry; must be star-connected to minimize noise coupling |
| DGND (Pin 11) | Digital ground | Return path for DOUT, SCLK, CS, SHDN; separated from AGND but tied at single point near VDD decoupling |
| DOUT (Pin 12) | Serial data output | 3-wire interface output; MSB-first, EOC-leading format; 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 | Accepts 0–5MHz external clock; duty cycle unrestricted if high/low ≥100ns; must be inactive during conversion |
Key Features
| Feature | Design Value |
|---|---|
| On-chip 4.096V buffered reference | Eliminates need for external reference IC or resistor divider; supports ±0.5% accuracy over –40°C to +85°C with 0.8ppm/°C drift |
| 1.5µs track/hold acquisition time | Enables accurate sampling of fast transients without external hold capacitor; supports ≤5kΩ source impedance |
| SPI/QSPI/MICROWIRE-compatible interface | Direct connection to microcontrollers without protocol translation; requires only three digital lines (SCLK, CS, DOUT) |
| 2µA shutdown current | Reduces system-level power budget by >99% during idle; wake-up time is fixed 2µs (no capacitor recharge delay) |
| Industrial temperature grade (–40°C to +85°C) | Validated operation across full range with no derating; specified DC and AC performance maintained at extremes |
Applications
| Portable Data Logging | Remote Digital Signal Processing |
|---|---|
Use Scenario: Battery-powered environmental sensor node logging temperature, humidity, and pressure every 10 seconds using ultra-low-quiescent LDO and MSP430 MCU. IC Role / Device Role / Timing Role: ADC digitizes conditioned analog sensor outputs; internal reference eliminates calibration drift; 2µA shutdown extends battery life. Use Value: Enables 12-bit precision with <1.5mA active current and <2µA sleep - achieving >1 year runtime on CR2032 without compromising resolution. |
Use Scenario: Wireless vibration monitor mounted on rotating machinery, transmitting FFT-processed spectral data via LoRaWAN every 5 minutes. IC Role / Device Role / Timing Role: Front-end ADC captures accelerometer signal; 75ksps rate supports undersampling of 5kHz harmonics; SPI interface simplifies MCU firmware. Use Value: Delivers 70dB SINAD and 11.4 ENOB at 10kHz input - sufficient for bearing fault detection without external anti-alias filter complexity. |
| Isolated Data Acquisition | High-Accuracy Process Control |
Use Scenario: DIN-rail-mounted PLC module acquiring 4–20mA current loop signals across 1000V isolation barrier using ADuM5401 isolators. IC Role / Device Role / Timing Role: ADC interfaces directly to isolated op-amp output; REF pin used as stable 4.096V reference for both ADC and current-sense amplifier. Use Value: Shared internal reference ensures matched scaling between input conditioning and digitization - eliminating gain mismatch errors in closed-loop feedback. |
Use Scenario: Temperature controller for semiconductor wafer processing chamber requiring ±0.1°C stability over 0–1000°C thermocouple range. IC Role / Device Role / Timing Role: ADC digitizes cold-junction-compensated thermocouple voltage; ±½ LSB INL guarantees monotonic response critical for PID stability. Use Value: Guarantees no missing codes and <0.012% linearity error - preventing control oscillation or thermal runaway in safety-critical thermal regulation. |
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; 1MSPS throughput; no internal reference; requires external 2.5V ref | Better speed but higher power (1.2mA @ 1MSPS); lacks integrated reference - adds BOM cost and layout area | Select when >100ksps sampling is required and external reference already exists in system |
| MAX11131AUT+T | 12-bit, 500ksps, internal 4.096V ref, SPI-only interface, 6-pin SOT23 package | Smaller footprint and faster rate, but only 0°C to +70°C grade and no QSPI/MICROWIRE compatibility | Select for space-constrained consumer designs where industrial temp range and multi-protocol support are not required |
Compared with ADS7822U and MAX11131AUT+T, the MAX187AEWE+ uniquely balances industrial temperature operation, integrated reference, multi-protocol serial compatibility, and ultra-low shutdown current - making it optimal for ruggedized, battery-aware, and reference-minimized embedded systems.
Availability
MAX187AEWE+ is available at Aetrix Electronics and suitable for portable data logging, isolated data acquisition, remote digital signal processing, and high-accuracy process control requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX187AEWE+ 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, automotive, and communications applications.
The MAX187AEWE+ belongs to Maxim's precision data-converter product line, designed specifically for low-power, high-accuracy digitization in space- and energy-constrained embedded systems where reliability across industrial temperatures is mandatory.
FAQ
What is the operating temperature range for the MAX187AEWE+?
The MAX187AEWE+ is rated for industrial temperature operation from –40°C to +85°C. All electrical specifications - including ±½ LSB integral nonlinearity, 4.096V reference accuracy, and 75ksps throughput - are guaranteed across this full range. This makes the MAX187AEWE+ suitable for deployment in harsh environments such as factory automation, outdoor instrumentation, and motor control enclosures without thermal derating.
Does the MAX187AEWE+ require an external reference voltage?
No, the MAX187AEWE+ includes a laser-trimmed, temperature-compensated 4.096V internal reference with buffered output. When SHDN is pulled high, the internal reference is enabled and drives the REF pin. The MAX187AEWE+ achieves ±0.5% reference accuracy over –40°C to +85°C without any external components - eliminating reference ICs, resistors, or calibration overhead in most designs.
How does the SHDN pin function on the MAX187AEWE+?
The SHDN pin on the MAX187AEWE+ provides three-level control: pulling it low places the device in shutdown mode (2µA supply current); pulling it high enables the internal 4.096V reference; leaving it floating disables the internal reference and allows use of an external reference at the REF pin. This single pin configures both power state and reference topology - simplifying system design and reducing GPIO usage.
What serial interface protocols does the MAX187AEWE+ support?
The MAX187AEWE+ supports SPI, QSPI, and MICROWIRE protocols natively through its 3-wire interface (CS, SCLK, DOUT). It requires CPOL = 0 and CPHA = 0 timing. Unlike standard SPI, it outputs a leading end-of-conversion (EOC) bit followed by 12 data bits - enabling direct framing without status polling. QSPI mode allows full 12-bit readout in exactly 13 clock cycles with no trailing zeros.
What is the maximum recommended source impedance for the AIN pin on the MAX187AEWE+?
The MAX187AEWE+ specifies a maximum source impedance of 5kΩ for the AIN pin to guarantee full 1.5µs track/hold acquisition time and maintain specified AC performance. Higher impedances increase acquisition time nonlinearly (tACQ ≈ 9 × (RS + 5kΩ) × 16pF) and may degrade THD and SINAD. For sources >5kΩ, an external op-amp buffer such as the MAX427 or OP27 is recommended to preserve 12-bit accuracy.
MAX187AEWE+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- 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:
- -40°C ~ 80°C
- Supplier Device Package:
- 16-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX187AEWE+ FAQ
1.How can I place an order for MAX187AEWE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX187AEWE+ 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 MAX187AEWE+ reliable?
The price and inventory of MAX187AEWE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX187AEWE+ is usually 5 days.
3.What payment methods are accepted for MAX187AEWE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX187AEWE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX187AEWE+?
MAX187AEWE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX187AEWE+ 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 MAX187AEWE+?
For technical support, including MAX187AEWE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX187AEWE+ requirements.
6.How does Aetrix verify that MAX187AEWE+ is sourced from the original manufacturer or authorized distributors?
All MAX187AEWE+ 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 MAX187AEWE+ meets industry standards.
7.What is the process for return or replacement of MAX187AEWE+?
All MAX187AEWE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX187AEWE+, 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 MAX187AEWE+ part is unused and in its original packaging.
Return procedure for MAX187AEWE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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