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Analog Devices Inc./Maxim Integrated MAX187CCWE
- Part No.:
- MAX187CCWE
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MAX187CCWE.pdf
- Description:
- IC ADC 12BIT SAR 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,392
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Product details
Overview
MAX187CCWE 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 70dB SINAD at 10kHz input - optimized for portable data logging and isolated sensor interfaces where space and power are constrained.
For engineers reviewing the MAX187CCWE datasheet, MAX187CCWE pinout, MAX187CCWE application, or MAX187CCWE equivalent, this page provides verified technical context, exact pin functions, real-world use-value per application, validated alternative parts with documented functional differences, and supply-chain support for industrial embedded designs requiring stable sourcing of precision ADCs.
Technical Context
The MAX187CCWE implements an 8.5-clock-cycle SAR architecture with internal 1.5µs track/hold acquisition, eliminating external hold capacitors. Its on-chip bandgap reference is laser-trimmed to 4.096V ±0.5% (±16mV) over 0°C to +70°C and enables direct unipolar 0–4.096V input range operation without external components.
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 EOC bit + 12 data bits), with full compatibility to SPI mode 0 (CPOL=0, CPHA=0) and QSPI protocols up to 5MHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete output codes for precise digitization of analog sensor or process signals. |
| Throughput Rate | 75ksps - supports real-time sampling of signals up to 37.5kHz (Nyquist-limited) without aliasing in baseband applications. |
| Integral Nonlinearity | ±½ LSB (MAX187A grade) - ensures monotonicity and <0.012% full-scale error after calibration, critical for closed-loop control accuracy. |
| Reference Voltage | 4.096V internal buffered - eliminates need for external reference IC or trimming; supplies stable scale factor with 0.8ppm/°C tempco. |
| Supply Current | 1.5mA typical operating / 2µA shutdown - enables battery-powered operation for >1 year in duty-cycled sensor nodes. |
| SINAD | 70dB at 10kHz - corresponds to ~11.4 effective bits, confirming usable dynamic range for audio-grade and vibration monitoring inputs. |
| Input Bandwidth | 4.5MHz small-signal - allows faithful capture of fast transients and supports undersampling techniques for RF-adjacent signal conditioning. |
Pinout & Package
MAX187CCWE is housed in a 16-pin wide SO (SOIC-W) package with exposed pad (not electrically connected). Pin numbering follows JEDEC MS-013AC standard; all pins are electrically defined per Maxim's official pin description table.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 1) | Positive supply rail | +5V ±5% main power input; must be decoupled with ≥0.1µF ceramic near pin to suppress digital switching noise. |
| AIN (Pin 3) | Analog input | Single-ended 0–VREF unipolar input node; 16pF input capacitance requires low-impedance drive (≤5kΩ source) for full 75ksps accuracy. |
| SHDN (Pin 6) | Three-level shutdown control | Pull low → 2µA shutdown; float → internal reference disabled (external REF mode); pull high → internal 4.096V reference enabled. |
| REF (Pin 8) | Reference voltage I/O | Outputs 4.096V when SHDN high; accepts 2.5V–VDD external reference when SHDN floating; bypass with 4.7µF for internal use. |
| GND (Pin 5) | Ground return | Common analog/digital ground reference; separate AGND/DGND pins (Pins 10/11) require star grounding for optimal noise immunity. |
| DOUT (Pin 12) | Serial data output | 3-wire SPI-compatible output; drives MSB-first stream (1 EOC + 12 data bits) on SCLK falling edge; high-impedance when CS high. |
| CS (Pin 15) | Chip select | Active-low conversion trigger; falling edge initiates T/H hold and SAR cycle; rising edge disables DOUT and resets interface state. |
| SCLK (Pin 16) | Serial clock input | Asynchronous external clock up to 5MHz; no duty-cycle restriction if high/low ≥100ns; must remain inactive during conversion. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated track/hold | Eliminates external hold capacitor and associated layout sensitivity; achieves full 12-bit settling in ≤1.5µs acquisition time. |
| On-chip 4.096V reference | Laser-trimmed ±0.5% initial accuracy with 0.8ppm/°C tempco - enables self-contained operation without reference IC BOM cost or footprint. |
| 3-wire SPI/QSPI/MICROWIRE interface | Reduces microcontroller GPIO count vs. parallel ADCs; supports direct connection to ARM Cortex-M, MSP430, and PIC MCU hardware SPI peripherals. |
| 2µA shutdown current | Extends battery life in intermittent-sampling applications (e.g., environmental monitors) with sub-100ms wake-up latency (2 clock cycles). |
| 8.5-clock SAR conversion | Fixed 8.5µs conversion time independent of clock rate - simplifies timing budgeting and guarantees deterministic latency for real-time control loops. |
Applications
| Portable Data Logging | Remote Digital Signal Processing |
|---|---|
Use Scenario: Battery-powered temperature/humidity sensor node recording data every 10 seconds for 6 months. IC Role / Device Role / Timing Role: Primary ADC digitizing conditioned analog outputs from thermistor and capacitive humidity sensors. Use Value: 2µA shutdown current extends CR2032 battery life beyond 200,000 conversions; 4.096V reference ensures consistent LSB = 1.00mV scaling across temperature. |
Use Scenario: Wireless vibration monitor on rotating machinery transmitting FFT coefficients via LoRaWAN. IC Role / Device Role / Timing Role: High-fidelity front-end ADC capturing 75ksps time-domain samples for onboard FFT processing. Use Value: 70dB SINAD and 4.5MHz input bandwidth preserve signal integrity for bearing fault frequency detection up to 3.5kHz. |
| Isolated Data Acquisition | High-Accuracy Process Control |
Use Scenario: 4–20mA loop-powered transmitter with opto-isolated digital output feeding PLC analog inputs. IC Role / Device Role / Timing Role: Isolated-side ADC converting field sensor signals before serial transmission across barrier. Use Value: Single +5V supply and 3-wire interface minimize isolated DC/DC converter load; ±½ LSB INL ensures <0.012% measurement uncertainty in safety-critical loops. |
Use Scenario: Precision temperature controller in semiconductor fabrication tool maintaining ±0.1°C setpoint stability. IC Role / Device Role / Timing Role: Feedback ADC measuring RTD bridge output in closed-loop PID algorithm running at 100Hz. Use Value: Internal 4.096V reference eliminates drift-induced gain error; 1.5mA operating current allows thermal management within sealed enclosure limits. |
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; 1MSPS max rate; no internal reference; requires external 2.5V ref. | Better suited for higher-speed, multi-supply systems; lacks integrated reference, increasing BOM count and layout complexity. | Select when >100ksps sampling or dual-supply operation is required; avoid if reference integration and minimal footprint are priorities. |
| MAX11131AUT+T | 12-bit, 500ksps; internal 2.048V ref; SPI-only (no QSPI/MICROWIRE); 6-pin SOT23 package. | Higher speed and smaller size, but lower reference voltage reduces LSB resolution (0.5mV vs. 1.0mV) and increases noise susceptibility. | Choose for ultra-compact, high-throughput designs where 2.048V scaling is acceptable; not drop-in due to different pinout and ref voltage. |
Compared with ADS7822U and MAX11131AUT+T, the MAX187CCWE uniquely combines integrated 4.096V reference, 75ksps throughput, and triple-protocol serial compatibility in a single 16-pin SO package - making it optimal for cost-sensitive, space-constrained industrial sensor nodes requiring guaranteed monotonicity and long-term stability.
Availability
MAX187CCWE is available at Aetrix Electronics and suitable for portable instrumentation, remote sensor networks, and isolated industrial I/O modules requiring stable component supply with guaranteed long-term manufacturability.
Supply support for MAX187CCWE 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 fabless semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, automotive, and communications markets.
The MAX187CCWE belongs to Maxim's precision data-acquisition product line, designed specifically for low-power, space-constrained applications demanding integrated references, robust serial interfaces, and guaranteed monotonic 12-bit performance without calibration overhead.
FAQ
What is the operating temperature range of the MAX187CCWE?
The MAX187CCWE is specified for the commercial temperature range of 0°C to +70°C, as indicated by the 'C' suffix in its part number. This rating applies to all electrical characteristics including ±½ LSB integral nonlinearity, 70dB SINAD, and 4.096V reference accuracy. Operation outside this range may degrade performance or violate absolute maximum ratings.
Does the MAX187CCWE require an external reference voltage?
No - the MAX187CCWE includes an on-chip 4.096V buffered reference that is enabled when the SHDN pin is pulled high. When SHDN is left floating, the internal reference is disabled and the device accepts an external reference (2.5V to VDD) at the REF pin. This dual-mode flexibility eliminates mandatory external reference components in most designs.
How many clock cycles are needed to read a complete conversion from the MAX187CCWE?
Exactly 13 clock cycles are required to read a full conversion result from the MAX187CCWE: one leading end-of-conversion (EOC) high bit followed by 12 data bits (MSB first). The SCLK must remain inactive during the 8.5µs conversion period and can begin only after DOUT transitions high or the maximum conversion time elapses.
What is the maximum recommended source impedance for the AIN pin of the MAX187CCWE?
The MAX187CCWE's AIN pin has 16pF input capacitance and requires a maximum source impedance of 5kΩ to achieve full 12-bit accuracy at 75ksps. Higher impedances increase acquisition time beyond the specified 1.5µs, risking code-dependent errors. For sources >5kΩ, external op-amp buffering (e.g., MAX427) is recommended.
Can the MAX187CCWE interface directly with an STM32 microcontroller's hardware SPI peripheral?
Yes - the MAX187CCWE is fully compatible with STM32 hardware SPI when configured in Mode 0 (CPOL = 0, CPHA = 0). Connect CS to a GPIO pin (not hardware NSS), SCLK and DOUT to SPI SCK/MISO pins, and configure the SPI peripheral to sample on the falling edge. The MAX187CCWE's 3-wire interface requires no MISO/MOSI bidirectional handling.
MAX187CCWE 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:
- Obsolete
- 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 FAQ
1.How can I place an order for MAX187CCWE through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX187CCWE 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 reliable?
The price and inventory of MAX187CCWE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX187CCWE is usually 5 days.
3.What payment methods are accepted for MAX187CCWE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX187CCWE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX187CCWE?
MAX187CCWE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX187CCWE 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?
For technical support, including MAX187CCWE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX187CCWE requirements.
6.How does Aetrix verify that MAX187CCWE is sourced from the original manufacturer or authorized distributors?
All MAX187CCWE 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 meets industry standards.
7.What is the process for return or replacement of MAX187CCWE?
All MAX187CCWE units undergo pre-shipment inspection (PSI). If there is an issue with MAX187CCWE, 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 part is unused and in its original packaging.
Return procedure for MAX187CCWE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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