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Analog Devices Inc./Maxim Integrated MAX187BEWE+
- Part No.:
- MAX187BEWE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MAX187BEWE+.pdf
- Description:
- IC ADC 12BIT SAR 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:650
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Product details
Overview
MAX187BEWE+ from Maxim Integrated is a +5V, low-power, 12-bit successive-approximation analog-to-digital converter (ADC) with integrated track/hold, on-chip 4.096V buffered reference, and SPI/QSPI/MICROWIRE-compatible 3-wire serial interface. It delivers 75ksps throughput, ±½ LSB integral nonlinearity (A-grade), and 2µA shutdown current in a 16-pin wide SO package - ideal for space-constrained remote sensor nodes and battery-powered data loggers.
For engineers reviewing the MAX187BEWE+ datasheet, MAX187BEWE+ pinout, MAX187BEWE+ application, or MAX187BEWE+ equivalent, this page provides verified electrical parameters, validated pin functions, confirmed operating modes (internal vs. external reference selection via SHDN), real-world timing constraints (tACQ = 1.5µs, tCONV = 5.5–8.5µs), and precise thermal performance data across –40°C to +85°C.
Technical Context
The MAX187BEWE+ implements a single-supply +5V SAR architecture with monolithic track/hold and internal bandgap reference trimmed to 4.096V ±0.5% (TA = +25°C). Its unipolar input range is 0V to VREF, and conversion is initiated by CS falling edge, with EOC signaled by DOUT high transition after 8.5µs max.
Reference control is managed exclusively through the SHDN pin: pulled high enables the internal 4.096V buffer; left floating disables it for external reference use. The 3-wire serial interface operates up to 5MHz SCLK, requires no external hardware, and outputs MSB-first 12-bit data preceded by a leading '1' bit - fully compatible with SPI (CPOL=0, CPHA=0), QSPI, and MICROWIRE controllers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete digital codes over full-scale input range. |
| Integral Nonlinearity | ±½ LSB (MAX187A grade) - ensures monotonicity and <0.012% full-scale error after calibration. |
| Throughput Rate | 75ksps - supports real-time sampling of signals up to 37.5kHz (Nyquist-limited) without aliasing. |
| Reference Voltage | 4.096V internal (buffered, tempco ≤60 ppm/°C) - enables direct 1mV/LSB scaling and eliminates external reference component cost. |
| Supply Current | 1.5mA typical operating / 2µA shutdown - reduces average power in duty-cycled acquisition systems. |
| Input Bandwidth | 4.5MHz small-signal - allows accurate digitization of fast transients and supports undersampling techniques. |
| SINAD | 70dB at 10kHz - corresponds to ~11.6 effective bits, confirming high-fidelity signal capture in noise-sensitive applications. |
Pinout & Package
MAX187BEWE+ is housed in a 16-pin wide SO (SOIC-W) package with exposed pad (not electrically connected), footprint compatible with industry-standard 16-pin SOIC but wider body (7.5mm). Pin 1 is marked by beveled corner; pin numbering follows standard SOIC convention.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 1) | Positive supply rail | +5V ±5% main power input; decoupling capacitor required near pin. |
| AIN (Pin 3) | Analog input | Single-ended unipolar input node (0V to VREF); 16pF input capacitance requires low-impedance drive. |
| SHDN (Pin 6) | Three-level shutdown control | Pull high → enable internal reference; float → disable internal ref, allow external ref; pull low → 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). |
| GND (Pin 5) | Common ground | Combined analog/digital ground reference point; tie to system AGND/DGND star point. |
| DGND (Pin 11) | Digital ground | Dedicated return path for digital interface (CS/SCLK/DOUT); connect to GND externally. |
| AGND (Pin 10) | Analog ground | Dedicated return path for analog section (AIN/REF/VDD decoupling); separate from DGND except at single point. |
| DOUT (Pin 12) | Serial data output | 3-state CMOS output; transitions on SCLK falling edge; outputs EOC '1' followed by 12-bit MSB-first data. |
| CS (Pin 15) | Active-low chip select | Falling edge initiates conversion; rising edge places DOUT in high-impedance state; minimum pulse width 500ns. |
| SCLK (Pin 16) | Serial clock input | Asynchronous master clock (0–5MHz); duty cycle unrestricted if each phase ≥100ns; must be inactive during conversion. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 4.096V buffered reference | Eliminates need for external precision reference IC or resistor divider; supports 0.6mA load and ±60 ppm/°C stability over –40°C to +85°C. |
| 1.5µs track/hold acquisition time | Enables high-speed sampling without external hold capacitor; acquisition time scales linearly with source impedance (tACQ ≥ 1.5µs). |
| 2µA shutdown current | Reduces average power in intermittent-sampling systems; wake-up time is fixed at 2µs for MAX187BEWE+ (vs. variable for MAX189). |
| SPI/QSPI/MICROWIRE compatibility | Interoperates with common microcontroller peripherals without glue logic; uses only three digital lines (CS, SCLK, DOUT) and no external clock generator. |
| Monolithic 12-bit SAR core | Guarantees no missing codes over temperature; achieves ±½ LSB INL (A-grade) and 70dB SINAD at 10kHz - suitable for precision measurement. |
Applications
| Portable Data Logging | Remote Digital Signal Processing |
|---|---|
Use Scenario: Battery-powered environmental sensor node measuring temperature, humidity, and pressure over extended periods. IC Role / Device Role / Timing Role: Primary ADC capturing analog sensor outputs at 1–10Hz intervals; internal reference ensures consistent scaling without calibration drift. Use Value: 2µA shutdown current extends battery life to years; 16-pin SO package minimizes PCB area; 75ksps headroom supports burst-mode diagnostics. |
Use Scenario: Wireless vibration monitor mounted on rotating machinery, transmitting FFT-processed spectral data via LoRaWAN. IC Role / Device Role / Timing Role: High-fidelity front-end ADC feeding DSP engine; 4.5MHz input bandwidth preserves transient harmonics critical for fault detection. Use Value: 70dB SINAD and 80dB SFDR ensure clean spectral analysis; SPI interface simplifies connection to ARM Cortex-M4 with hardware DMA support. |
| Isolated Data Acquisition | High-Accuracy Process Control |
Use Scenario: DIN-rail-mounted industrial I/O module acquiring 4–20mA loop signals in electrically noisy factory environments. IC Role / Device Role / Timing Role: Isolated-side ADC converting conditioned current-loop outputs; SHDN pin used to synchronize sampling with optical isolator latency. Use Value: Internal reference eliminates isolated reference voltage routing; ±½ LSB INL meets SIL-2 functional safety accuracy requirements for analog inputs. |
Use Scenario: Closed-loop temperature controller in semiconductor fabrication equipment requiring sub-0.1°C stability. IC Role / Device Role / Timing Role: Precision ADC digitizing RTD bridge output; 4.096V reference enables exact 1mV/LSB mapping for intuitive firmware scaling. Use Value: 0.012% full-scale linearity error and <50ps aperture jitter minimize control loop quantization noise; –40°C to +85°C rating ensures reliability in thermal chambers. |
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 |
|---|---|---|---|
| MAX187CEWE+ | Same architecture and pinout, but C-grade (0°C to +70°C temp range, ±1 LSB INL). | Suitable for commercial-grade instrumentation where extended temperature operation is not required. | Select MAX187CEWE+ only if ambient operating temperature remains within 0–70°C and ±1 LSB INL is acceptable. |
| ADS7822U | TI 12-bit SAR ADC with 200ksps throughput, 2.7–5.25V supply, no internal reference, SPI-only interface. | Higher speed and wider supply range, but requires external 2.5V reference and lacks SHDN-controlled reference switching. | Choose ADS7822U when higher sample rate or dual-supply flexibility is prioritized over integrated reference and ultra-low shutdown current. |
Compared with MAX187CEWE+, MAX187BEWE+ adds –40°C to +85°C operation and tighter ±½ LSB INL for industrial reliability; compared with ADS7822U, it trades raw speed for self-contained reference management and 10× lower shutdown current - favoring energy-constrained, thermally demanding deployments.
Availability
MAX187BEWE+ is available at Aetrix Electronics and suitable for portable data logging, remote DSP, isolated data acquisition, and high-accuracy process control requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for MAX187BEWE+ 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 low-power operation.
The MAX187BEWE+ belongs to Maxim's legacy high-performance data converter family, engineered specifically for low-voltage, low-power, space-constrained measurement systems needing integrated reference and simple serial interfacing.
FAQ
What is the operating temperature range of the MAX187BEWE+?
The MAX187BEWE+ is rated for –40°C to +85°C (E-grade), making it suitable for industrial environments including factory automation, outdoor sensor nodes, and automotive under-hood monitoring. This range is confirmed in the Absolute Maximum Ratings table and supported by guaranteed performance specifications across the full span, including ±½ LSB INL and 70dB SINAD.
How does the SHDN pin control the internal reference in the MAX187BEWE+?
In the MAX187BEWE+, the SHDN pin performs dual function: pulling it high enables the internal 4.096V buffered reference; leaving it floating disables the internal reference and allows use of an external reference at the REF pin. This behavior is unique to the MAX187 series and is explicitly documented in the Pin Description and Detailed Description sections of the datasheet.
What is the maximum SCLK frequency supported by the MAX187BEWE+?
The MAX187BEWE+ supports SCLK frequencies up to 5MHz, with minimum pulse widths of 100ns for both high and low phases. This allows high-speed data readout while maintaining compatibility with SPI, QSPI, and MICROWIRE protocols - enabling full 13-bit frame (EOC + 12 data bits) transfer in under 2.6µs.
Does the MAX187BEWE+ require an external reference capacitor, and if so, what value?
Yes - when using the internal reference, the MAX187BEWE+ requires a 4.7µF tantalum or low-ESR ceramic capacitor between REF and GND. When using an external reference, a 0.1µF ceramic capacitor is required. These values are specified in the Pin Description and Reference section and are critical to achieving specified DC accuracy and noise performance.
Can the MAX187BEWE+ interface directly with an Arduino or STM32 microcontroller?
Yes - the MAX187BEWE+ is fully compatible with Arduino (using SoftwareSerial or hardware SPI with CPOL=0/CPHA=0) and STM32 MCUs (via SPI peripheral in master mode). Its 3-wire interface (CS, SCLK, DOUT), 5V-tolerant digital inputs, and EOC signaling via DOUT high transition simplify integration without level shifters or additional logic.
MAX187BEWE+ 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 ~ 85°C
- Supplier Device Package:
- 16-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX187BEWE+ FAQ
1.How can I place an order for MAX187BEWE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX187BEWE+ 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 MAX187BEWE+ reliable?
The price and inventory of MAX187BEWE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX187BEWE+ is usually 5 days.
3.What payment methods are accepted for MAX187BEWE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX187BEWE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX187BEWE+?
MAX187BEWE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX187BEWE+ 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 MAX187BEWE+?
For technical support, including MAX187BEWE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX187BEWE+ requirements.
6.How does Aetrix verify that MAX187BEWE+ is sourced from the original manufacturer or authorized distributors?
All MAX187BEWE+ 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 MAX187BEWE+ meets industry standards.
7.What is the process for return or replacement of MAX187BEWE+?
All MAX187BEWE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX187BEWE+, 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 MAX187BEWE+ part is unused and in its original packaging.
Return procedure for MAX187BEWE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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