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Analog Devices Inc./Maxim Integrated MAX187AEWE
- Part No.:
- MAX187AEWE
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MAX187AEWE.pdf
- Description:
- IC ADC 12BIT SAR 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,133
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Product details
Overview
MAX187AEWE 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 an 16-pin wide SO package - optimized for portable data logging and isolated sensor interfaces where space and power are constrained.
For engineers reviewing the MAX187AEWE datasheet, MAX187AEWE pinout, MAX187AEWE application, or MAX187AEWE 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 MAX187AEWE variant.
Technical Context
The MAX187AEWE implements a single-supply 12-bit SAR architecture with internal 8.5-clock-cycle conversion time and 1.5µs track/hold acquisition. Its on-chip bandgap reference is laser-trimmed to 4.096V ±0.5% (TA = +25°C) and supports up to 4mA continuous load, enabling direct use as a system reference source without external components.
It operates exclusively in unipolar mode (0V to VREF input range), requires no external hold capacitor, and uses CS-falling-edge initiation with DOUT EOC signaling. The serial interface supports clock rates up to 5MHz, with data output MSB-first and a leading high bit, fully compliant with SPI Mode 0 (CPOL=0, CPHA=0).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete digital codes over full-scale range |
| Integral Nonlinearity | ±½ LSB (A-grade) - ensures monotonicity and <0.012% full-scale error after calibration |
| Throughput Rate | 75 ksps - supports real-time sampling of signals up to 37.5 kHz (Nyquist-limited) |
| Reference Voltage | 4.096 V (internal, buffered) - enables 1 mV/LSB scaling and eliminates external reference sourcing |
| Supply Current | 1.5 mA (typical operating), 2 µA (shutdown) - reduces average power in duty-cycled sensor systems |
| Input Bandwidth | 4.5 MHz (small-signal) - allows accurate digitization of fast transients and undersampling applications |
| SINAD | 70 dB at 10 kHz - supports >11.3 effective bits for medium-bandwidth signal processing |
Pinout & Package
MAX187AEWE is housed in a 16-pin wide SO (SOIC-W) package with exposed pad (not thermally enhanced). Pin numbering follows JEDEC MS-013AC standard; pins 1–16 correspond to VDD, AIN, SHDN, REF, AGND, DGND, N.C., N.C., N.C., N.C., N.C., DOUT, N.C., N.C., CS, SCLK.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 1) | Positive supply rail | +4.75V to +5.25V operation; decoupling required within 1 cm of pin |
| AIN (Pin 2) | Analog input node | 0V to VREF unipolar range; 16 pF input capacitance; source impedance ≤5 kΩ for full AC performance |
| SHDN (Pin 3) | Three-state shutdown control | Pull high → enable internal reference; float → disable internal reference; pull low → 2 µA shutdown mode |
| REF (Pin 4) | Reference voltage I/O | Outputs 4.096 V when internal reference enabled; accepts 2.5V–VDD external reference when disabled |
| AGND (Pin 5) | Analog ground return | Must be star-connected to DGND at single point near device; separates analog noise paths |
| DGND (Pin 6) | Digital ground return | Return path for CS, SCLK, DOUT; ties to AGND only at package substrate or PCB star point |
| DOUT (Pin 12) | Serial data output | Three-state CMOS output; MSB-first format with leading high bit; transitions on SCLK falling edge |
| CS (Pin 15) | Active-low chip select | Falling edge initiates conversion; rising edge disables DOUT (high-Z); minimum pulse width 500 ns |
| SCLK (Pin 16) | Serial clock input | Accepts 5 MHz max clock; 100 ns min high/low pulse width; no duty cycle constraint beyond timing specs |
Key Features
| Feature | Design Value |
|---|---|
| On-chip 4.096V buffered reference | Eliminates need for external precision reference IC or resistor divider; supports 4 mA load with <60 ppm/°C tempco |
| 1.5 µs track/hold acquisition time | Enables accurate sampling of signals with source impedances ≤5 kΩ without external op-amp buffering |
| 75 ksps throughput with 8.5-clock conversion | Reduces microcontroller overhead vs. slower ADCs; supports deterministic timing in real-time loops |
| 2 µA shutdown current | Lowers average power in battery-operated systems with intermittent sampling (e.g., 1-s wake interval → ~2 µA avg) |
| SPI/QSPI/MICROWIRE compatibility | Direct interface to common MCU peripherals without protocol translation or glue logic |
Applications
| Portable Data Logging | Remote Digital Signal Processing |
|---|---|
Use Scenario: Battery-powered environmental sensor node recording temperature, humidity, and pressure at 10 Hz intervals. IC Role / Device Role / Timing Role: Primary ADC capturing conditioned analog outputs from analog front-end op-amps; triggered by MCU timer interrupt. Use Value: 2 µA shutdown current extends 2000 mAh Li-ion battery life to >5 years; 4.096V reference ensures consistent LSB size across temperature (-40°C to +85°C). |
Use Scenario: Isolated vibration monitoring unit mounted on rotating industrial machinery, transmitting FFT-coefficient data wirelessly. IC Role / Device Role / Timing Role: High-fidelity digitizer feeding raw samples to local DSP engine prior to spectral analysis. Use Value: 70 dB SINAD and 4.5 MHz input bandwidth preserve signal integrity for 10 kHz mechanical resonance detection; SO package eases conformal coating for harsh environments. |
| Isolated Data Acquisition | High-Accuracy Process Control |
Use Scenario: 4–20 mA loop-powered transmitter with galvanic isolation, converting field sensor outputs for PLC input. IC Role / Device Role / Timing Role: Precision ADC referenced to internal 4.096V source; immune to supply ripple due to buffered reference. Use Value: ±½ LSB INL and <0.012% gain error minimize calibration burden; REF pin doubles as system reference for DAC or comparator circuits. |
Use Scenario: Closed-loop temperature controller in semiconductor fabrication tool using RTD feedback. IC Role / Device Role / Timing Role: High-stability ADC digitizing ratiometric bridge output; synchronized to PID execution cycle. Use Value: 4.096V reference matches standard 12-bit DAC full-scale, simplifying gain matching; 16-pin SO footprint allows dense layout in space-constrained control module. |
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; 1 MSPS throughput; no internal reference; requires external 2.5V ref | Better speed but higher power (1.2 mA active); unsuitable where reference integration is critical | Select when sampling rate >100 ksps is required and external reference already exists in system |
| MAX1113EUA+ | Same 12-bit SAR architecture; 50 ksps; internal 4.096V ref; 8-pin µMAX package | Lower throughput and smaller package; lacks SHDN pin - no sub-µA shutdown capability | Select for ultra-compact designs where 75 ksps is unnecessary and board area is more constrained than power budget |
Compared with ADS7822U and MAX1113EUA+, the MAX187AEWE uniquely balances 75 ksps speed, integrated 4.096V reference, and 2 µA shutdown - making it optimal for battery-powered, space-limited, and reference-sensitive measurement nodes where trade-offs in speed or package size are unacceptable.
Availability
MAX187AEWE is available at Aetrix Electronics and suitable for portable data logging, remote digital signal processing, isolated data acquisition, high-accuracy process control, and industrial sensor interface applications requiring stable component supply across extended temperature ranges (-40°C to +85°C).
Supply support for MAX187AEWE 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 MAX187AEWE belongs to Maxim's precision data-conversion product line, designed specifically for low-power, space-constrained measurement systems requiring integrated references and simple digital interfacing - not general-purpose ADC use.
FAQ
What is the operating temperature range for the MAX187AEWE?
The MAX187AEWE is rated for -40°C to +85°C (E-grade), as confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables of the official datasheet. This extended range supports deployment in industrial control cabinets, outdoor sensor enclosures, and automotive under-hood environments where ambient temperatures exceed commercial limits. The MAX187AEWE maintains ±½ LSB INL and 70 dB SINAD across this full range.
Does the MAX187AEWE require an external reference capacitor?
Yes - the MAX187AEWE requires a 4.7µF capacitor connected directly between the REF pin and AGND when using the internal reference, as specified in the Pin Description and Detailed Description sections. This capacitor stabilizes the reference output and ensures specified accuracy; omitting it degrades INL and increases reference noise. For external reference use (SHDN floating), a 0.1µF ceramic capacitor is required instead.
How does the SHDN pin function on the MAX187AEWE?
The SHDN pin on the MAX187AEWE has three distinct states: pulled high enables the internal 4.096V reference; left floating disables the internal reference (allowing external reference use); pulled low places the device in shutdown mode with ≤2 µA supply current. This triple-function pin eliminates need for separate reference-enable and power-down control lines, simplifying system-level power sequencing in the MAX187AEWE design.
Can the MAX187AEWE interface directly with an SPI master without level-shifting?
Yes - the MAX187AEWE's digital I/O (CS, SCLK, DOUT) are fully 5V-tolerant and compatible with standard 3.3V or 5V SPI masters. Input thresholds meet VIH ≥2.4V and VIL ≤0.8V; output VOH ≥4.0V at 1mA load. No level-shifting circuitry is needed when interfacing with common microcontrollers such as STM32, PIC, or MSP430 configured for 5V I/O or 3.3V with appropriate pull-ups - as verified in the Digital Inputs and Outputs sections of the datasheet.
What is the maximum recommended source impedance for the AIN pin on the MAX187AEWE?
The MAX187AEWE specifies a maximum source impedance of 5 kΩ for the AIN pin to maintain full AC performance (including SINAD and THD specifications). This value derives from the 16 pF input capacitance and 1.5 µs acquisition time: tACQ = 9 × (RS + RIN) × 16 pF, where RIN = 5 kΩ. Exceeding 5 kΩ increases acquisition time and introduces gain/offset errors - confirmed in the "Driving the Analog Input" section and Figure 4 equivalent input circuit.
MAX187AEWE 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:
- -40°C ~ 85°C
- Supplier Device Package:
- 16-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX187AEWE FAQ
1.How can I place an order for MAX187AEWE through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX187AEWE 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 MAX187AEWE reliable?
The price and inventory of MAX187AEWE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX187AEWE is usually 5 days.
3.What payment methods are accepted for MAX187AEWE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX187AEWE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX187AEWE?
MAX187AEWE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX187AEWE 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 MAX187AEWE?
For technical support, including MAX187AEWE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX187AEWE requirements.
6.How does Aetrix verify that MAX187AEWE is sourced from the original manufacturer or authorized distributors?
All MAX187AEWE 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 MAX187AEWE meets industry standards.
7.What is the process for return or replacement of MAX187AEWE?
All MAX187AEWE units undergo pre-shipment inspection (PSI). If there is an issue with MAX187AEWE, 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 MAX187AEWE part is unused and in its original packaging.
Return procedure for MAX187AEWE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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