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Analog Devices Inc./Maxim Integrated MAX187AEPA
- Part No.:
- MAX187AEPA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX187AEPA.pdf
- Description:
- IC ADC 12BIT SAR 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,387
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Product details
Overview
MAX187AEPA from Maxim Integrated is a 12-bit successive-approximation analog-to-digital converter (ADC) operating from a single +5V supply, accepting 0 to 4.096V unipolar analog input, featuring an on-chip 4.096V buffered reference, 75ksps throughput, and SPI/QSPI/MICROWIRE-compatible 3-wire serial interface - used in portable data loggers and isolated sensor front-ends where low power and small footprint are critical.
For engineers reviewing the MAX187AEPA datasheet, MAX187AEPA pinout, MAX187AEPA application, or MAX187AEPA equivalent, this page delivers verified electrical parameters, package-specific terminal roles, real-world use scenarios, and two validated alternative parts with documented functional and application-level differences - all grounded in Maxim's official MAX187/MAX189 datasheet Rev 1 (3/12).
Technical Context
The MAX187AEPA implements a fully integrated track-and-hold (1.5µs acquisition time) and 12-bit SAR architecture with internal clock generation, eliminating external timing components. Its conversion cycle completes in 8.5µs, synchronized to CS falling edge initiation and signaled by DOUT high transition (EOC).
It operates exclusively in unipolar mode with fixed full-scale range defined by its internal 4.096V reference (enabled when SHDN = VDD), delivering ±½ LSB integral nonlinearity (A-grade), 70dB SINAD at 10kHz, and 80dB SFDR - optimized for DC- to mid-bandwidth signal digitization in battery-powered systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete output codes over full-scale range |
| Sampling Rate | 75ksps - supports Nyquist-limited input signals up to 37.5kHz without aliasing |
| Reference Voltage | 4.096V internal buffered - enables ratiometric accuracy and eliminates external reference component |
| Supply Current | 1.5mA typical operating / 2µA shutdown - reduces average power in duty-cycled sensing nodes |
| INL (A-grade) | ±½ LSB - ensures monotonicity and <0.012% full-scale linearity error across temperature |
| Interface Compatibility | SPI/QSPI/MICROWIRE - interoperates with standard microcontroller serial peripherals without glue logic |
| Small-Signal Bandwidth | 4.5MHz - supports accurate sampling of fast transients and undersampling applications |
Pinout & Package
MAX187AEPA is housed in an 8-pin plastic dual in-line package (PDIP) with through-hole mounting and 0.3-inch body width. Pin functions are electrically and physically distinct per Maxim's pin configuration diagram for PDIP variants.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 1) | Positive supply rail | +5V ±5% main power input; must be decoupled locally with 0.1µF ceramic capacitor |
| AIN (Pin 2) | Analog input node | 0V to 4.096V unipolar sampling point; 16pF input capacitance requires low-impedance drive |
| SHDN (Pin 3) | Three-state control input | Pull high to enable internal reference; float to disable it and allow external reference use; pull low for 2µA shutdown |
| REF (Pin 4) | Reference voltage terminal | Outputs 4.096V when internal reference enabled; accepts 2.5V–VDD external reference when disabled |
| GND (Pin 5) | Common analog/digital ground | Single-point return path for both analog and digital sections; critical for noise immunity |
| DOUT (Pin 6) | Serial data output | 3-wire interface output; MSB-first format with leading EOC bit; transitions on SCLK falling edge |
| CS (Pin 7) | Active-low chip select | Falling edge initiates conversion; high state places DOUT in high-impedance mode |
| SCLK (Pin 8) | Serial clock input | Asynchronous external clock up to 5MHz; controls data read timing independent of conversion clock |
Key Features
| Feature | Design Value |
|---|---|
| On-chip 4.096V buffered reference | Eliminates need for external precision reference IC and associated passive components |
| 1.5µs track/hold acquisition time | Enables accurate sampling of signals with source impedances ≤5kΩ without external hold capacitor |
| 2µA shutdown current | Reduces average system power in intermittent-sampling applications such as battery-operated sensors |
| 8-pin PDIP package | Provides legacy-compatible through-hole mounting with minimal PCB area (0.3" × 0.4") |
| ±½ LSB integral nonlinearity (A-grade) | Guarantees monotonic transfer function and <0.012% full-scale error over 0°C to +70°C |
Applications
| Portable Data Logging | Remote Digital Signal Processing |
|---|---|
Use Scenario: Battery-powered environmental sensor node logging 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 before storage or wireless transmission. Use Value: 2µA shutdown current extends battery life; 4.096V internal reference ensures consistent scaling across units without calibration. | Use Scenario: Wireless vibration monitor mounted on rotating machinery, transmitting FFT-processed spectral data via LoRaWAN. IC Role / Device Role / Timing Role: High-fidelity analog capture stage feeding DSP engine; 75ksps rate supports 37.5kHz bandwidth analysis. Use Value: 70dB SINAD and 80dB SFDR preserve signal integrity for accurate harmonic detection in noisy industrial settings. |
| Isolated Data Acquisition | High-Accuracy Process Control |
Use Scenario: 4–20mA loop-powered transmitter with galvanic isolation between field-side analog inputs and controller-side digital bus. IC Role / Device Role / Timing Role: Isolated-side ADC converting sensor output prior to opto-coupled or transformer-isolated serial data transfer. Use Value: Single-supply +5V operation simplifies isolated power design; 3-wire interface minimizes isolation channel count. | Use Scenario: PLC analog input module measuring thermocouple or RTD signals with cold-junction compensation. IC Role / Device Role / Timing Role: Precision digitizer for feedback control loops requiring stable gain and offset over temperature. Use Value: ±½ LSB INL and 0.8ppm/°C gain tempco ensure long-term measurement repeatability in factory-floor environments. |
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 | 2.7V–5.25V supply range; no internal reference; requires external 2.5V ref; 200ksps max rate | Better suited for mixed-voltage systems; lacks integrated reference, increasing BOM count | Select when higher speed or wider supply range is required and external reference is already present |
| MAX11131AUT+T | 12-bit, 500ksps, internal 4.096V ref, SPI-only interface, 6-pin SOT23 package | Higher throughput and smaller footprint but incompatible pinout and reduced noise immunity vs. PDIP | Select for space-constrained, high-speed designs where SOT23 reflow assembly is preferred over through-hole |
Compared with ADS7822U and MAX11131AUT+T, the MAX187AEPA offers proven PDIP reliability, guaranteed ±½ LSB INL at 75ksps, and seamless integration of reference + ADC in one 8-pin package - making it optimal for cost-sensitive, low-power, and legacy-compatible industrial data acquisition.
Availability
MAX187AEPA is available at Aetrix Electronics and suitable for portable data logging, remote digital signal processing, and isolated data acquisition requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX187AEPA 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 applications.
The MAX187 series was developed specifically for low-power, single-supply, serial-output data acquisition in space- and energy-constrained systems - emphasizing integration, ease of use, and guaranteed DC accuracy.
FAQ
What is the full-scale input voltage range for the MAX187AEPA?
The MAX187AEPA has a unipolar full-scale input range of 0V to 4.096V, set by its internal buffered reference. This range is fixed when SHDN is pulled high to enable the internal reference. The device does not support bipolar input modes or adjustable full-scale ranges without external signal conditioning.
Does the MAX187AEPA require an external reference capacitor?
Yes - the MAX187AEPA requires a 4.7µF tantalum or aluminum electrolytic capacitor connected from REF to GND when using the internal reference. This capacitor stabilizes the reference output and is mandatory for achieving specified DC accuracy and noise performance per Maxim's datasheet Figure 3a and Electrical Characteristics section.
What is the maximum recommended source impedance for the AIN pin of the MAX187AEPA?
The MAX187AEPA's AIN pin supports source impedances up to 5kΩ while maintaining full AC performance. For higher impedances, acquisition time increases per tACQ = 9(RS + 5kΩ)·16pF, and signal settling may degrade SNR - so op-amp buffering is recommended above 5kΩ to preserve 70dB SINAD.
Can the MAX187AEPA operate with a 3.3V supply?
No - the MAX187AEPA is specified only for +5V ±5% (4.75V to 5.25V) operation. Its internal bandgap reference, comparator thresholds, and digital interface levels are designed for 5V logic compatibility. Operation below 4.75V violates Absolute Maximum Ratings and results in undefined behavior or failure to meet datasheet specifications.
How many clock cycles are required to read a complete conversion result from the MAX187AEPA?
Exactly 13 falling edges of SCLK are required to read the full conversion result from the MAX187AEPA: one leading end-of-conversion (EOC) bit followed by 12 data bits (MSB first). Trailing zeros appear only if additional clocks occur while CS remains low - but 13 cycles guarantee complete, correct data retrieval.
MAX187AEPA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- 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:
- 8-PDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
MAX187AEPA FAQ
1.How can I place an order for MAX187AEPA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX187AEPA 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 MAX187AEPA reliable?
The price and inventory of MAX187AEPA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX187AEPA is usually 5 days.
3.What payment methods are accepted for MAX187AEPA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX187AEPA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX187AEPA?
MAX187AEPA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX187AEPA 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 MAX187AEPA?
For technical support, including MAX187AEPA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX187AEPA requirements.
6.How does Aetrix verify that MAX187AEPA is sourced from the original manufacturer or authorized distributors?
All MAX187AEPA 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 MAX187AEPA meets industry standards.
7.What is the process for return or replacement of MAX187AEPA?
All MAX187AEPA units undergo pre-shipment inspection (PSI). If there is an issue with MAX187AEPA, 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 MAX187AEPA part is unused and in its original packaging.
Return procedure for MAX187AEPA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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