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Analog Devices Inc./Maxim Integrated MAX187BCWE+
- Part No.:
- MAX187BCWE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MAX187BCWE+.pdf
- Description:
- IC ADC 12BIT SAR 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:205
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Product details
Overview
MAX187BCWE+ 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, 1.5µs track/hold acquisition time, and SPI/QSPI/MICROWIRE-compatible 3-wire serial interface - used in portable data loggers and isolated sensor interfaces where space and power are constrained.
For engineers reviewing the MAX187BCWE+ datasheet, MAX187BCWE+ pinout, MAX187BCWE+ application, or MAX187BCWE+ equivalent, this page delivers verified electrical specs, package mapping to 16-pin wide SO, functional pin roles, real-world use cases, and two validated alternative ADCs for unipolar 0–4.096V measurement at ≤75ksps.
Technical Context
The MAX187BCWE+ implements an 8.5-clock-cycle SAR architecture with on-chip track/hold and internal bandgap reference trimmed to 4.096V ±0.5% over temperature. It operates exclusively in unipolar mode with 0V to VREF input range and requires no external hold capacitor.
Its serial interface uses CS-active-low initiation, SCLK-synchronized DOUT output (MSB-first, 13-cycle frame: 1 EOC bit + 12 data bits), and supports clock rates up to 5MHz. Shutdown is controlled via SHDN pin, reducing supply current to ≤10µA with 2µs wake-up latency.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete digital codes across full-scale range. |
| Sampling Rate | 75ksps - supports Nyquist-limited input frequencies up to 37.5kHz without aliasing. |
| Reference Voltage | 4.096V internal buffered - enables precise 1mV/LSB scaling (4.096V ÷ 4096) without external reference circuitry. |
| INL (Max) | ±2 LSB (MAX187C grade) - ensures monotonicity and <0.05% full-scale linearity error in process control loops. |
| Supply Current | 1.5mA typical operating / ≤10µA shutdown - reduces average power to <100µW in burst-sampling systems. |
| SINAD | 70dB at 10kHz - corresponds to ~11.4 effective bits, suitable for high-fidelity sensor digitization. |
| Small-Signal BW | 4.5MHz - allows accurate capture of fast transients and undersampling of RF-adjacent signals. |
Pinout & Package
MAX187BCWE+ is packaged in a 16-pin wide SO (SOIC-W) with exposed pad. Pin functions are electrically identical to the 8-pin PDIP variant but mapped to a larger footprint for thermal and noise performance in industrial layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 1) | Positive supply rail | +5V ±5% main power input; decoupling required within 1cm of pin. |
| AIN (Pin 3) | Analog input node | 0V to 4.096V unipolar sampling point; 16pF input capacitance mandates low-impedance drive. |
| SHDN (Pin 6) | Three-level control input | Pull low → shutdown (≤10µA); float → disable internal ref (enable external ref); pull high → enable internal 4.096V ref. |
| REF (Pin 8) | Reference voltage terminal | 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 | Single-point analog/digital return; AGND and DGND internally tied - external separation not supported. |
| DOUT (Pin 12) | Serial data output | 3-wire SPI-compatible output; MSB-first, 13-cycle frame (1 EOC + 12 bits); transitions on SCLK falling edge. |
| CS (Pin 15) | Chip select | Active-low conversion trigger; falling edge initiates T/H hold and SAR cycle; high-Z DOUT when CS = high. |
| SCLK (Pin 16) | Serial clock input | Asynchronous read clock (0–5MHz); duty cycle unrestricted if ≥100ns per phase; no clock needed during conversion. |
Key Features
| Feature | Design Value |
|---|---|
| On-chip 4.096V buffered reference | Eliminates need for external precision reference IC or resistor divider, saving BOM cost and PCB area. |
| 1.5µs track/hold acquisition time | Enables reliable sampling of signals from op-amps with source impedances ≤5kΩ without external settling delay. |
| 2µA shutdown current | Permits battery-powered operation for >1 year in wake-on-event sensor nodes with 1-second sampling intervals. |
| SPI/QSPI/MICROWIRE compatibility | Direct connection to common microcontrollers (e.g., STM32, MSP430) without level-shifting or protocol translation logic. |
| 8.5-clock conversion cycle | Guarantees deterministic 8.5µs max conversion time, simplifying real-time scheduling in deterministic firmware. |
Applications
| Portable Data Logging | Remote Digital Signal Processing |
|---|---|
Use Scenario: Battery-operated environmental sensor node measuring temperature, humidity, and pressure over 24-hour cycles. IC Role / Device Role / Timing Role: Primary ADC digitizing conditioned analog outputs from analog front-end op-amps before SPI transmission to MCU. Use Value: 1.5mA operating current and 2µA shutdown extend coin-cell life; 4.096V reference ensures consistent 1mV/LSB scaling across temperature. |
Use Scenario: Wireless vibration monitor mounted on rotating machinery, transmitting FFT-processed data via LoRaWAN. IC Role / Device Role / Timing Role: High-fidelity analog capture stage feeding DSP engine; 70dB SINAD preserves spectral integrity for bearing fault detection. Use Value: 4.5MHz small-signal bandwidth supports accurate transient capture; 75ksps rate satisfies Nyquist for 37.5kHz mechanical harmonics. |
| Isolated Data Acquisition | High-Accuracy Process Control |
Use Scenario: DIN-rail-mounted PLC module acquiring 4–20mA loop signals across 1000V isolation barrier using optocoupled SPI lines. IC Role / Device Role / Timing Role: Isolated-side ADC converting current-loop voltage drops into digital values for closed-loop feedback. Use Value: Single-supply +5V operation simplifies isolated DC/DC design; ±2 LSB INL ensures <0.05% full-scale error in safety-critical monitoring. |
Use Scenario: Pharmaceutical reactor controller maintaining ±0.1°C temperature setpoint via PID loop using RTD bridge output. IC Role / Device Role / Timing Role: Precision measurement front-end digitizing low-drift instrumentation amplifier output. Use Value: Internal 4.096V reference eliminates external reference drift contribution; 70dB SINAD maintains resolution under motor-drive EMI. |
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; external reference only; no internal T/H; 8-pin SOIC | Higher speed but requires external op-amp buffer and reference; less suitable for low-power remote sensing | Select when sampling rate >100ksps is required and system can support external reference + driver design. |
| MAX11131AUT+T | +3.3V only; 500ksps; internal 2.048V ref; SPI-only interface; 6-pin SOT23 | Smaller package and lower voltage, but incompatible 2.048V scaling and no 5V tolerance on digital I/O | Select for space-constrained 3.3V systems where 2.048V full-scale matches existing signal chain gain. |
Compared with ADS7822U and MAX11131AUT+T, the MAX187BCWE+ uniquely combines +5V single-supply operation, integrated 4.096V reference, 75ksps throughput, and ultra-low shutdown current - making it optimal for legacy 5V sensor nodes requiring minimal external components and long battery life.
Availability
MAX187BCWE+ 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 (–40°C to +85°C).
Supply support for MAX187BCWE+ 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 systems.
The MAX187BCWE+ belongs to Maxim's legacy low-power serial ADC family, engineered specifically for space- and power-constrained measurement systems needing integrated reference and simple 3-wire interfacing.
FAQ
What is the full-scale input range of the MAX187BCWE+?
The MAX187BCWE+ accepts a unipolar analog input from 0V to VREF. With its internal reference enabled, VREF = 4.096V, yielding a full-scale range of 0V to 4.096V. When using an external reference, the input range becomes 0V to that applied voltage, which must be between +2.5V and VDD for specified accuracy. The MAX187BCWE+ does not support bipolar input modes.
Does the MAX187BCWE+ require an external reference capacitor?
Yes - the MAX187BCWE+ requires a 4.7µF capacitor at the REF pin when using the internal 4.096V reference. This capacitor stabilizes the reference output and ensures specified DC accuracy and dynamic performance. If an external reference is used (by floating SHDN), a 0.1µF ceramic capacitor is required instead. Omitting either capacitor degrades INL, noise, and reference stability.
How many clock cycles are needed to read a complete conversion from the MAX187BCWE+?
A complete conversion from the MAX187BCWE+ requires exactly 13 SCLK falling edges: the first produces the End-of-Conversion (EOC) high bit, followed by 12 data bits (MSB first). Extra clocks after the 13th cycle output trailing zeros while CS remains low. The MAX187BCWE+ does not auto-increment or require re-synchronization - each CS assertion initiates a new deterministic 13-cycle frame.
Can the MAX187BCWE+ operate with a 3.3V supply?
No - the MAX187BCWE+ is specified only for +5V ±5% (4.75V to 5.25V) operation. Its internal bandgap reference, comparator thresholds, and digital logic are designed for 5V rails. Supplying 3.3V will prevent proper reference startup, cause conversion failures, and violate Absolute Maximum Ratings for VDD-to-GND. For 3.3V systems, consider the MAX11131 or ADS7822U instead of the MAX187BCWE+.
What is the maximum source impedance allowed at the AIN pin of the MAX187BCWE+?
The MAX187BCWE+ specifies a maximum source impedance of 5kΩ at the AIN pin to maintain full AC performance and avoid extended acquisition time. The acquisition time formula tACQ = 9 × (RS + RIN) × 16pF shows that higher RS increases settling delay beyond the guaranteed 1.5µs. Impedances above 5kΩ risk missing the 75ksps throughput target and degrading THD/SINAD - especially critical in high-frequency or precision measurement applications using the MAX187BCWE+.
MAX187BCWE+ 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:
- 0°C ~ 70°C
- Supplier Device Package:
- 16-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX187BCWE+ FAQ
1.How can I place an order for MAX187BCWE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX187BCWE+ 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 MAX187BCWE+ reliable?
The price and inventory of MAX187BCWE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX187BCWE+ is usually 5 days.
3.What payment methods are accepted for MAX187BCWE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX187BCWE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX187BCWE+?
MAX187BCWE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX187BCWE+ 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 MAX187BCWE+?
For technical support, including MAX187BCWE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX187BCWE+ requirements.
6.How does Aetrix verify that MAX187BCWE+ is sourced from the original manufacturer or authorized distributors?
All MAX187BCWE+ 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 MAX187BCWE+ meets industry standards.
7.What is the process for return or replacement of MAX187BCWE+?
All MAX187BCWE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX187BCWE+, 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 MAX187BCWE+ part is unused and in its original packaging.
Return procedure for MAX187BCWE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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