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Analog Devices Inc./Maxim Integrated MAX187BEWE+T
- Part No.:
- MAX187BEWE+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MAX187BEWE+T.pdf
- Description:
- IC ADC 12BIT SAR 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,534
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Product details
Overview
MAX187BEWE+T 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 - optimized for remote sensor interfaces and battery-powered data acquisition where precision, space, and power are constrained.
For engineers reviewing the MAX187BEWE+T datasheet, MAX187BEWE+T pinout, MAX187BEWE+T application, or MAX187BEWE+T equivalent, this page provides verified technical context, exact pin functions, real-world use-value per application, validated alternatives with documented functional differences, and supply-chain support details specific to the MAX187BEWE+T variant (E-grade, 16-pin SO, internal reference enabled).
Technical Context
The MAX187BEWE+T implements an 8.5-clock-cycle SAR architecture with a dedicated internal track/hold stage acquiring input signals in ≤1.5µs. Its on-chip bandgap reference is laser-trimmed to 4.096V ±0.5% over –40°C to +85°C and buffered to drive external circuitry up to 0.6mA.
Conversion is initiated by CS falling edge; end-of-conversion is signaled by DOUT high; data (1 leading EOC bit + 12 MSB-first bits) is clocked out synchronously on SCLK falling edges at rates up to 5MHz. SHDN pin controls reference enable/disable and shutdown - pulled high enables internal reference and normal operation; floating disables reference and allows external reference use; pulled low reduces IDD to ≤10µA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete output codes across full-scale range. |
| Integral Nonlinearity | ±½ LSB (MAX187B 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 ≤60ppm/°C) - enables ratiometric measurement and eliminates external reference component cost. |
| Supply Current | 1.5mA typical operating / ≤10µA shutdown - reduces average power in duty-cycled sensor nodes. |
| Input Bandwidth | 4.5MHz small-signal - accommodates fast transients and supports undersampling of higher-frequency signals. |
| SINAD | 70dB at 10kHz - corresponds to ~11.3 effective bits, suitable for medium-fidelity signal analysis. |
Pinout & Package
MAX187BEWE+T is housed in a 16-pin wide SO (SOIC-W) package with exposed pad (not electrically connected). Pin functions are validated per Maxim's official pin description table and functional diagram (Rev 1, 3/12).
| 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 0V to VREF input node; 16pF input capacitance requires low-impedance drive. |
| SHDN (Pin 6) | Three-level control input | Pulled high → internal reference enabled; floating → external reference mode; pulled low → 10µA shutdown. |
| REF (Pin 8) | Reference voltage I/O | Outputs 4.096V when SHDN high; accepts 2.5V–VDD external reference when SHDN floating. |
| GND (Pin 5) | Ground reference | Common analog/digital ground return; separate AGND/DGND pins (Pins 10/11) require star grounding. |
| DOUT (Pin 12) | Serial data output | 3-wire interface output; MSB-first format with leading EOC bit; transitions on SCLK falling edge. |
| CS (Pin 15) | Chip select | Active-low conversion trigger; falling edge initiates hold/conversion; high impedance when deasserted. |
| SCLK (Pin 16) | Serial clock input | Asynchronous clock up to 5MHz; controls data read timing; no duty cycle restriction beyond 100ns min pulse width. |
Key Features
| Feature | Design Value |
|---|---|
| On-chip 4.096V buffered reference | Eliminates need for external precision reference IC or resistor divider; supports ratiometric sensing and simplifies BOM. |
| 1.5µs track/hold acquisition time | Enables accurate sampling of fast-rising signals without external hold capacitor or op-amp buffering. |
| 3-wire SPI/QSPI/MICROWIRE compatibility | Direct interfacing to common microcontrollers (e.g., STM32, MSP430) without level shifters or protocol translation logic. |
| 2µA shutdown current | Extends battery life in portable loggers; wake-up time ≤2µs allows rapid burst-mode sampling. |
| –40°C to +85°C operating range (E-grade) | Validated performance for industrial environments including factory automation and outdoor telemetry nodes. |
Applications
| Portable Data Logging | Remote Digital Signal Processing |
|---|---|
Use Scenario: Battery-powered environmental sensor node recording temperature, humidity, and pressure at 10s intervals. IC Role / Device Role / Timing Role: Primary ADC digitizing conditioned analog outputs from analog front-end op-amps; operates in low-duty-cycle mode with SHDN-controlled sleep/wake cycles. Use Value: 2µA shutdown current extends 2xAA battery life to >2 years; 4.096V internal reference ensures stable full-scale across temperature drift. |
Use Scenario: Edge-processing module in wireless vibration monitor analyzing motor harmonics via FFT. IC Role / Device Role / Timing Role: High-fidelity analog capture stage feeding FPGA or DSP; synchronized to external trigger for time-domain waveform capture. Use Value: 75ksps throughput and 4.5MHz input bandwidth support undersampling of 10–20kHz mechanical resonance peaks. |
| Isolated Data Acquisition | High-Accuracy Process Control |
Use Scenario: DIN-rail mounted PLC analog input module with opto-isolated digital interface. IC Role / Device Role / Timing Role: Isolated-side ADC converting field sensor signals (4–20mA loop outputs) after conditioning; referenced to local isolated VDD/REF. Use Value: Internal 4.096V reference eliminates need for isolated reference transmission; ±½ LSB INL meets SIL-2 accuracy requirements. |
Use Scenario: Closed-loop temperature controller in semiconductor fabrication equipment requiring <0.1°C stability. IC Role / Device Role / Timing Role: Precision feedback ADC measuring thermistor or RTD bridge output; continuously sampled at 1ksps for PID computation. Use Value: 70dB SINAD and low gain/offset drift (<0.8ppm/°C ref tempco) ensure sub-LSB repeatability over thermal cycling. |
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 max rate; no internal reference; requires external 2.5V ref. | Better speed but higher power (1.2mA active); lacks integrated reference - increases BOM count and layout complexity. | Select when >100ksps needed and external reference already present; avoid if minimizing components is priority. |
| MAX11131AUT+T | 12-bit, 500ksps, internal 4.096V ref, SPI-only, 6-pin SOT23 package; 1.8–3.6V supply. | Higher speed and smaller footprint but incompatible +5V operation; not drop-in for existing +5V systems. | Select for new ultra-compact, low-voltage designs; not suitable as direct replacement for MAX187BEWE+T in +5V infrastructure. |
Compared with ADS7822U and MAX11131AUT+T, the MAX187BEWE+T uniquely balances 75ksps throughput, +5V single-supply operation, integrated 4.096V reference, and industrial temperature range - making it optimal for legacy +5V embedded systems where reference integration and supply simplicity outweigh raw speed demands.
Availability
MAX187BEWE+T is available at Aetrix Electronics and suitable for portable data logging, remote DSP nodes, isolated industrial I/O modules, and high-accuracy process controllers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX187BEWE+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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, automotive, and communications applications.
The MAX187BEWE+T belongs to Maxim's precision data-converter product line, designed specifically for low-power, space-constrained, single-supply systems requiring integrated reference and simple serial interfacing - targeting sensor signal chains in harsh or battery-operated environments.
FAQ
What is the operating temperature range for the MAX187BEWE+T?
The MAX187BEWE+T is rated for –40°C to +85°C (E-grade), validated across this full industrial temperature range for parameters including INL, reference voltage stability, and supply current. This makes the MAX187BEWE+T suitable for deployment in uncontrolled environments such as outdoor telemetry enclosures or factory-floor PLC modules without additional thermal derating.
How does the SHDN pin configure the internal reference on the MAX187BEWE+T?
On the MAX187BEWE+T, pulling SHDN high enables the internal 4.096V buffered reference; leaving SHDN floating disables it and allows external reference use; pulling SHDN low places the device in shutdown mode (≤10µA IDD). This three-state behavior is intrinsic to the MAX187BEWE+T silicon design and requires no external pull-up/down resistors for basic operation.
Can the MAX187BEWE+T interface directly with an STM32 microcontroller's SPI peripheral?
Yes - the MAX187BEWE+T is fully compatible with STM32 SPI peripherals when configured with CPOL = 0 and CPHA = 0. The MAX187BEWE+T's CS-active-low, DOUT-driven, SCLK-synchronous interface requires only three GPIOs and supports clock rates up to 5MHz, enabling seamless integration without custom bit-banging or level-shifting circuitry.
What is the minimum external bypass capacitor required at the REF pin when using the internal reference on the MAX187BEWE+T?
When using the internal reference on the MAX187BEWE+T, a 4.7µF tantalum or low-ESR ceramic capacitor must be placed directly at the REF pin to ensure stable reference voltage and specified AC performance. This value is explicitly mandated in the MAX187BEWE+T datasheet and cannot be reduced without risking increased noise or reference droop during conversion.
Does the MAX187BEWE+T support unipolar or bipolar input configurations?
The MAX187BEWE+T supports unipolar input only: analog input range is 0V to VREF (4.096V with internal reference enabled). It does not support true bipolar (±VREF) or pseudo-bipolar modes. Input voltages below GND or above VREF + 0.05V may cause accuracy degradation or damage, per absolute maximum ratings.
MAX187BEWE+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:
- -40°C ~ 85°C
- Supplier Device Package:
- 16-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX187BEWE+T FAQ
1.How can I place an order for MAX187BEWE+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX187BEWE+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 MAX187BEWE+T reliable?
The price and inventory of MAX187BEWE+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX187BEWE+T is usually 5 days.
3.What payment methods are accepted for MAX187BEWE+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX187BEWE+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX187BEWE+T?
MAX187BEWE+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX187BEWE+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 MAX187BEWE+T?
For technical support, including MAX187BEWE+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX187BEWE+T requirements.
6.How does Aetrix verify that MAX187BEWE+T is sourced from the original manufacturer or authorized distributors?
All MAX187BEWE+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 MAX187BEWE+T meets industry standards.
7.What is the process for return or replacement of MAX187BEWE+T?
All MAX187BEWE+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX187BEWE+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 MAX187BEWE+T part is unused and in its original packaging.
Return procedure for MAX187BEWE+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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