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Analog Devices Inc./Maxim Integrated MAX187ACPA
- Part No.:
- MAX187ACPA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX187ACPA.pdf
- Description:
- IC ADC 12BIT SAR 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,638
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Product details
Overview
MAX187ACPA 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, and SPI/QSPI/MICROWIRE-compatible 3-wire serial interface. It operates in 0°C to +70°C industrial temperature range, features ±½ LSB integral nonlinearity, 1.5µs track/hold acquisition time, and consumes only 1.5mA typical supply current - ideal for portable data logging and isolated sensor interfaces where space, power, and precision are constrained.
For engineers reviewing the MAX187ACPA datasheet, MAX187ACPA pinout, MAX187ACPA application, or MAX187ACPA equivalent, this page delivers verified technical context, exact pin functions, real-world use scenarios, validated alternative parts, and supply-chain support tailored for embedded sensor systems, remote DSP nodes, and battery-powered measurement circuits.
Technical Context
The MAX187ACPA implements an 8.5-clock-cycle SAR architecture with on-chip track/hold, internal bandgap reference trimmed to 4.096V ±0.5%, and unipolar 0V–VREF input range. Its conversion sequence is initiated by CS falling edge, with end-of-conversion signaled by DOUT high transition after 5.5–8.5µs.
It supports external clock rates up to 5MHz, requires no external hold capacitor, and uses SHDN pin state (high = internal reference enabled; floating = external reference mode) to configure reference source - enabling flexible system-level voltage referencing without hardware changes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete digital codes over full-scale input range. |
| Integral Nonlinearity | ±½ LSB (MAX187A grade) - ensures monotonic transfer function and <0.012% full-scale error after calibration. |
| Throughput Rate | 75ksps - supports real-time sampling of signals up to 37.5kHz Nyquist bandwidth. |
| Reference Voltage | 4.096V internal buffered output - provides stable, temperature-compensated reference with ±30ppm/°C tempco (C-grade). |
| Supply Current | 1.5mA typical operating / 2µA shutdown - enables ultra-low-power operation between conversions in battery-critical designs. |
| Input Bandwidth | 4.5MHz small-signal - allows accurate digitization of fast transients and supports undersampling applications. |
| SINAD | 70dB at 10kHz - corresponds to ~11.4 effective bits, confirming high-fidelity signal capture for sensor and control loops. |
Pinout & Package
MAX187ACPA is housed in an 8-pin plastic dual in-line package (PDIP), pin-compatible with industry-standard through-hole prototyping and legacy industrial PCB layouts.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 1) | Power supply input | +5V ±5% main supply rail; must be decoupled near pin with 0.1µF ceramic capacitor. |
| AIN (Pin 2) | Analog input terminal | Accepts 0V to VREF unipolar signal; 16pF input capacitance requires low-impedance drive (<5kΩ) for full 75ksps performance. |
| SHDN (Pin 3) | Three-level shutdown control | Pull low → 2µA shutdown; float → disable internal reference for external REF use; pull high → enable 4.096V internal reference. |
| REF (Pin 4) | Reference voltage node | Outputs 4.096V when internal reference enabled; accepts 2.5V–VDD external reference when disabled; bypass with 4.7µF for internal use. |
| GND (Pin 5) | Analog/digital common ground | Single ground connection for PDIP version; separates AGND/DGND internally but shares pin in 8-pin package. |
| DOUT (Pin 6) | Serial data output | 3-wire SPI-compatible output; MSB-first format with leading EOC '1' bit; transitions on SCLK falling edge. |
| CS (Pin 7) | Active-low chip select | Falling edge initiates conversion; high-Z DOUT when CS high; minimum pulse width 500ns. |
| SCLK (Pin 8) | Serial clock input | External clock up to 5MHz; controls data read timing; duty cycle unrestricted if ≥100ns per phase. |
Key Features
| Feature | Design Value |
|---|---|
| On-chip 4.096V buffered reference | Eliminates need for external precision reference IC or resistor divider; supports direct connection to other circuitry as stable 4.096V source. |
| 1.5µs track/hold acquisition time | Enables high-speed sampling without external hold capacitor; reduces board area and component count in compact sensor front-ends. |
| 2µA shutdown current | Permits aggressive power cycling in intermittent-sampling applications (e.g., wireless sensor nodes), extending battery life by orders of magnitude. |
| SPI/QSPI/MICROWIRE compatibility | Interfaces directly with most microcontrollers (e.g., STM32, MSP430, PIC) without level shifters or protocol translation logic. |
| ±½ LSB integral nonlinearity (A-grade) | Guarantees monotonicity and <0.012% full-scale linearity error - critical for closed-loop control and high-accuracy calibration systems. |
Applications
| Portable Data Logging | Remote Digital Signal Processing |
|---|---|
Use Scenario: Battery-powered environmental sensor node recording temperature, humidity, and pressure at 10–100Hz intervals. IC Role / Device Role / Timing Role: Primary ADC digitizing conditioned analog sensor outputs; provides precise 12-bit resolution with minimal power overhead during active sampling bursts. Use Value: 2µA shutdown current extends coin-cell lifetime beyond 5 years; internal 4.096V reference removes need for external voltage reference IC, reducing BOM count and layout complexity. |
Use Scenario: Isolated analog front-end feeding raw sensor data to a remote DSP over RS-485 or wireless link. IC Role / Device Role / Timing Role: High-fidelity signal acquisition stage before digital filtering and feature extraction; synchronized via external microcontroller clock. Use Value: 70dB SINAD and 4.5MHz input bandwidth preserve signal integrity for FFT-based spectral analysis; 3-wire interface simplifies isolation barrier design using single optocoupler per signal line. |
| Isolated Data Acquisition | High-Accuracy Process Control |
Use Scenario: 4–20mA loop-powered transmitter with galvanic isolation between field sensors and control room PLC. IC Role / Device Role / Timing Role: Precision ADC converting isolated analog sensor output into digital representation for HART or Modbus transmission. Use Value: ±½ LSB INL ensures repeatability across temperature; internal reference stability (±30ppm/°C) eliminates drift-induced calibration drift in harsh industrial environments. |
Use Scenario: Closed-loop feedback controller monitoring motor current, position, or thermal response in servo drives or HVAC systems. IC Role / Device Role / Timing Role: Real-time analog monitoring element feeding control algorithm; operates continuously at 75ksps with deterministic latency. Use Value: 1.5µs acquisition time and 8.5µs max conversion time guarantee sub-10µs total latency - essential for fast-response PID tuning and fault detection. |
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 |
|---|---|---|---|
| ADS7816U | 12-bit, 200ksps, +5V supply, no internal reference, requires external 4.096V ref; 8-pin SOIC package. | Higher speed but lacks integrated reference - demands additional reference IC and layout area; better suited for systems already using precision external references. | Select ADS7816U when throughput >75ksps is required and reference infrastructure exists; avoid if minimizing component count is priority. |
| MAX1112CPE+ | 12-bit, 100ksps, +5V supply, internal 4.096V reference, SPI-compatible, 16-pin PDIP/SO; higher power (3.5mA typ). | Same reference architecture but larger package and higher quiescent current - less suitable for space- or power-constrained portable designs. | Choose MAX1112CPE+ only when needing higher throughput with identical reference convenience; MAX187ACPA remains superior for ultra-low-power or PDIP-limited boards. |
Compared with ADS7816U and MAX1112CPE+, the MAX187ACPA uniquely balances 75ksps speed, 2µA shutdown, internal 4.096V reference, and 8-pin PDIP footprint - making it the optimal choice for cost-sensitive, space-constrained, battery-operated measurement systems requiring guaranteed ±½ LSB linearity.
Availability
MAX187ACPA is available at Aetrix Electronics and suitable for portable data logging, remote DSP nodes, isolated data acquisition, and high-accuracy process control requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for MAX187ACPA 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 semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, automotive, and communications markets.
The MAX187 family was designed specifically for low-power, high-precision serial ADC applications in portable instrumentation and distributed sensor networks - emphasizing integration, ease of use, and robustness in real-world embedded environments.
FAQ
What is the operating temperature range for the MAX187ACPA?
The MAX187ACPA is rated for 0°C to +70°C ambient operation ('C' grade). This industrial temperature range ensures reliable performance in commercial and light-industrial equipment such as handheld meters, programmable logic controllers, and sensor transmitters without requiring extended-temperature components or thermal derating.
Does the MAX187ACPA require an external reference voltage?
No - the MAX187ACPA includes a factory-trimmed, temperature-compensated 4.096V internal reference that is enabled when the SHDN pin is pulled high. An external reference is optional and used only when SHDN is left floating, allowing flexibility for systems requiring tighter reference accuracy or different voltage levels.
How does the MAX187ACPA achieve its 2µA shutdown current?
The MAX187ACPA achieves 2µA shutdown current by disabling its internal reference buffer, SAR core, and track/hold circuitry when the SHDN pin is driven low. This deep power-down state preserves system-level energy budgets in battery-powered applications while maintaining fast wake-up (<2µs) for rapid resumption of sampling.
Can the MAX187ACPA interface directly with an STM32 microcontroller?
Yes - the MAX187ACPA's 3-wire SPI-compatible interface (CS, SCLK, DOUT) works natively with STM32 SPI peripherals configured in master mode, CPOL = 0 and CPHA = 0. Its 5MHz max SCLK rate and MSB-first output format align with standard STM32 HAL drivers, requiring no custom firmware or bit-banging logic for integration.
What is the maximum analog input frequency supported by the MAX187ACPA?
The MAX187ACPA supports analog input frequencies up to 37.5kHz under Nyquist sampling (75ksps rate). Its 4.5MHz small-signal bandwidth also enables undersampling of higher-frequency signals (e.g., RF IF stages), provided anti-alias filtering is applied - confirmed by its 80dB SFDR and -80dB THD specifications.
MAX187ACPA 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:
- 0°C ~ 70°C
- Supplier Device Package:
- 8-PDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
MAX187ACPA FAQ
1.How can I place an order for MAX187ACPA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX187ACPA 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 MAX187ACPA reliable?
The price and inventory of MAX187ACPA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX187ACPA is usually 5 days.
3.What payment methods are accepted for MAX187ACPA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX187ACPA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX187ACPA?
MAX187ACPA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX187ACPA 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 MAX187ACPA?
For technical support, including MAX187ACPA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX187ACPA requirements.
6.How does Aetrix verify that MAX187ACPA is sourced from the original manufacturer or authorized distributors?
All MAX187ACPA 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 MAX187ACPA meets industry standards.
7.What is the process for return or replacement of MAX187ACPA?
All MAX187ACPA units undergo pre-shipment inspection (PSI). If there is an issue with MAX187ACPA, 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 MAX187ACPA part is unused and in its original packaging.
Return procedure for MAX187ACPA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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