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Analog Devices Inc./Maxim Integrated MAX187CCWE+T
- Part No.:
- MAX187CCWE+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MAX187CCWE+T.pdf
- Description:
- IC ADC 12BIT SAR 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,576
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Product details
Overview
MAX187CCWE+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, 8.5µs conversion time, and SPI/QSPI/MICROWIRE-compatible 3-wire serial interface. It operates in 0°C to +70°C industrial temperature range and targets space-constrained sensor signal conditioning and remote data acquisition systems.
For engineers reviewing the MAX187CCWE+T datasheet, MAX187CCWE+T pinout, MAX187CCWE+T application, or MAX187CCWE+T equivalent, key selection criteria include internal reference accuracy (±0.5% over temperature), shutdown current (≤10µA), unipolar 0–4.096V input range, 70dB SINAD at 10kHz, and 8-pin SO package compatibility with legacy PCB layouts.
Technical Context
The MAX187CCWE+T implements a single-supply 12-bit SAR architecture with on-chip track/hold (1.5µs acquisition), internal bandgap reference trimmed to 4.096V ±0.5%, and serial output synchronized to external SCLK (up to 5MHz). Its unipolar transfer function maps 0V to 4.096V full-scale across 4096 codes, with LSB = 1mV.
Control logic uses active-low CS to initiate conversion on falling edge, DOUT high-impedance until end-of-conversion (EOC) signaled by rising edge, then MSB-first serial output timed to SCLK falling edge. SHDN pin enables three-level operation: low = shutdown (≤10µA), high = internal reference enabled, floating = external reference mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR - delivers 4096 discrete digital codes for precise analog measurement |
| Sampling Rate | 75ksps - supports up to 37.5kHz Nyquist-limited sinusoidal input without aliasing |
| Reference Voltage | 4.096V internal buffered - eliminates need for external precision reference; ±0.5% tolerance over 0°C to +70°C |
| SINAD | 70dB at 10kHz - ensures >11.3 effective bits for medium-bandwidth signal processing |
| Supply Current | 1.5mA typical operating / ≤10µA shutdown - enables battery-powered operation with rapid wake-up (2µs) |
| Interface | 3-wire SPI/QSPI/MICROWIRE - requires only CS, SCLK, DOUT; no external hardware needed for µP/DSP interfacing |
| Input Range | 0V to VREF (0–4.096V) unipolar - simplifies sensor interface design with ratiometric scaling |
Pinout & Package
MAX187CCWE+T is housed in a 16-pin wide SO (SOIC-W) package with exposed pad, measuring 10.3mm × 7.5mm × 2.65mm. Pin 1 is marked with dot; pins 2, 4, 5, 7, 9, 13, and 14 are NC (no connection) and recommended to be tied to AGND for noise immunity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 1) | Power supply input | +5V ±5% supply; must be decoupled with 0.1µF ceramic near pin |
| AIN (Pin 3) | Analog input | 0–4.096V unipolar sampling node; 16pF input capacitance requires low-Z drive |
| SHDN (Pin 6) | Three-level control input | Low = shutdown (≤10µA); high = enable internal ref; floating = external ref mode |
| REF (Pin 8) | Reference voltage I/O | Outputs 4.096V when internal ref enabled; accepts 2.5V–VDD external ref when disabled |
| GND (Pin 5) | Ground return | Common analog/digital ground; separate AGND/DGND pins exist but not used in this variant |
| DOUT (Pin 12) | Serial data output | MSB-first, 13-bit frame (1 EOC bit + 12 data bits); transitions on SCLK falling edge |
| CS (Pin 15) | Chip select | Active-low conversion trigger; falling edge initiates T/H hold and SAR cycle |
| SCLK (Pin 16) | Serial clock input | External clock up to 5MHz; duty cycle unrestricted if ≥100ns per phase |
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 op-amp buffering |
| 75ksps throughput rate | Supports real-time monitoring of fast transients in industrial control loops and vibration sensing |
| 2µs wake-up from shutdown | Allows microsecond-scale power cycling between samples to achieve sub-µA average current in intermittent logging |
| QSPI-compatible 13-clock readout | Reduces firmware overhead vs. SPI: full 12-bit result retrieved in single 13-cycle burst, no byte-splitting required |
Applications
| Portable Data Logging | Remote Digital Signal Processing |
|---|---|
Use Scenario: Battery-powered environmental sensor node recording temperature, humidity, and pressure at 10s intervals over 6 months. IC Role / Device Role / Timing Role: ADC digitizes conditioned analog outputs from analog front-end op-amps; internal reference ensures stable full-scale calibration across temperature drift. Use Value: 10µA shutdown current extends battery life; 75ksps headroom allows oversampling for noise reduction without external timing circuitry. | Use Scenario: Wireless vibration monitor mounted on rotating machinery, transmitting FFT-coefficient packets via LoRaWAN every 500ms. IC Role / Device Role / Timing Role: Front-end ADC captures accelerometer waveforms; 70dB SINAD preserves spectral integrity for accurate harmonic analysis. Use Value: 4.5MHz small-signal bandwidth supports undersampling of >10kHz resonance peaks; QSPI interface minimizes µC GPIO usage. |
| Isolated Data Acquisition | High-Accuracy Process Control |
Use Scenario: DIN-rail PLC module with opto-isolated analog inputs acquiring 4–20mA loop signals in noisy factory environments. IC Role / Device Role / Timing Role: Isolated-side ADC converts conditioned current-loop voltage; internal reference removes dependency on isolated power rail stability. Use Value: ±½ LSB integral nonlinearity ensures <0.025% full-scale error; 16pF input capacitance simplifies anti-alias filter design. | Use Scenario: Closed-loop temperature controller in semiconductor fabrication tool using RTD sensor with 0.1°C resolution requirement. IC Role / Device Role / Timing Role: Precision ADC digitizes Wheatstone bridge output; 4.096V reference provides exact 1mV/LSB scaling for direct engineering-unit conversion. Use Value: 0.8ppm/°C gain tempco maintains calibration over ambient shifts; 1.5mA supply current avoids thermal self-heating errors. |
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; no internal reference; 1MSPS max rate; 8-pin SOIC | Requires external 4.096V reference; better suited for higher-speed sampling with external clock flexibility | Select when wider supply range or faster throughput is prioritized over reference integration |
| MAX11131AUT+T | 12-bit, 500ksps, internal 4.096V ref, SPI-only interface, 6-pin SOT23 | Smaller footprint and higher speed, but lacks QSPI/MICROWIRE compatibility and has tighter 0.5V–3.6V supply constraint | Select for ultra-compact designs where QSPI support is unnecessary and supply is regulated below 3.6V |
Compared with ADS7822U and MAX11131AUT+T, MAX187CCWE+T uniquely balances integrated reference accuracy, multi-standard serial compatibility (SPI/QSPI/MICROWIRE), and industrial temperature range in a widely available 16-pin SO package-making it optimal for legacy-replacement and mixed-interface embedded systems.
Availability
MAX187CCWE+T 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 extended production lifecycles.
Supply support for MAX187CCWE+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 U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, automotive, and communications markets.
The MAX187 series belongs to Maxim's precision data acquisition product line, designed specifically for low-power, space-constrained applications where integrated reference, serial simplicity, and guaranteed AC performance are critical.
FAQ
What is the maximum allowable source impedance driving AIN on the MAX187CCWE+T?
The MAX187CCWE+T specifies a 1.5µs track/hold acquisition time for source impedances ≤5kΩ. For higher impedances, acquisition time increases per tACQ = 9 × (RS + 5kΩ) × 16pF. Exceeding 5kΩ risks missing the 1.5µs window and degrading AC performance-so an op-amp buffer (e.g., MAX427) is recommended above that threshold. The MAX187CCWE+T datasheet confirms this limit under "Timing Characteristics" and "Driving the Analog Input" sections.
Does the MAX187CCWE+T require an external reference capacitor when using the internal reference?
Yes-the MAX187CCWE+T requires a 4.7µF tantalum or low-ESR electrolytic capacitor connected directly between REF and GND when the internal reference is enabled (SHDN = high). This stabilizes the reference output and ensures specified 4.096V accuracy and low-noise operation. Omitting it causes reference droop and increased INL error. The MAX187CCWE+T datasheet mandates this in the "Reference" and "Pin Description" sections.
Can the MAX187CCWE+T operate with a 3.3V supply?
No-the MAX187CCWE+T is specified only for +5V ±5% (4.75V to 5.25V) operation. Its internal reference, comparator thresholds, and digital interface levels are designed for 5V logic. Attempting 3.3V operation results in undefined behavior, failed conversions, and potential damage due to violation of absolute maximum ratings. The MAX187CCWE+T Electrical Characteristics table explicitly lists VDD min/max as 4.75V/5.25V.
How many clock cycles are required to read a complete conversion from the MAX187CCWE+T?
A minimum of 13 SCLK falling edges are required to read the full conversion result from the MAX187CCWE+T: one leading high bit (end-of-conversion flag) followed by 12 data bits (MSB first). Extra clocks after the 13th produce trailing zeros but do not affect operation. This is confirmed in the "Serial Interface" section and Figure 9 timing diagram of the MAX187CCWE+T datasheet.
What is the purpose of the SHDN pin's three-level functionality on the MAX187CCWE+T?
The SHDN pin on the MAX187CCWE+T provides three distinct modes: pulled low → shutdown (≤10µA supply current); pulled high → internal 4.096V reference enabled; left floating → internal reference disabled for external reference use. This eliminates need for additional control lines or configuration registers. The MAX187CCWE+T Pin Description table and "Detailed Description" section explicitly define these states and their functional impact.
MAX187CCWE+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:
- -
MAX187CCWE+T FAQ
1.How can I place an order for MAX187CCWE+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX187CCWE+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 MAX187CCWE+T reliable?
The price and inventory of MAX187CCWE+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX187CCWE+T is usually 5 days.
3.What payment methods are accepted for MAX187CCWE+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX187CCWE+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX187CCWE+T?
MAX187CCWE+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX187CCWE+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 MAX187CCWE+T?
For technical support, including MAX187CCWE+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX187CCWE+T requirements.
6.How does Aetrix verify that MAX187CCWE+T is sourced from the original manufacturer or authorized distributors?
All MAX187CCWE+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 MAX187CCWE+T meets industry standards.
7.What is the process for return or replacement of MAX187CCWE+T?
All MAX187CCWE+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX187CCWE+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 MAX187CCWE+T part is unused and in its original packaging.
Return procedure for MAX187CCWE+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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