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Analog Devices Inc./Maxim Integrated MAX187BEPA
- Part No.:
- MAX187BEPA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX187BEPA.pdf
- Description:
- IC ADC 12BIT SAR 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,236
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Product details
Overview
MAX187BEPA from Maxim Integrated is a +5V, 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 unipolar 0V to 4.096V input range, features on-chip track/hold (1.5µs acquisition), and targets low-power sensor and remote DSP applications requiring precision and compact footprint.
For engineers reviewing the MAX187BEPA datasheet, MAX187BEPA pinout, MAX187BEPA application, or MAX187BEPA equivalent, this page delivers verified technical context, exact pin functions, real-world use scenarios, and validated alternative options - all grounded in Maxim's official specifications for the MAX187BEPA variant in 8-pin PDIP packaging.
Technical Context
The MAX187BEPA implements a single-supply 12-bit SAR architecture with internal track/hold, eliminating external hold capacitors. Its conversion cycle is fixed at 8.5 clock periods (tCONV), initiated by CS falling edge, with end-of-conversion signaled by DOUT high transition.
Reference operation is controlled via SHDN: pulled high enables the laser-trimmed 4.096V ±0.5% internal bandgap reference; floating disables it for external reference use. Input sampling bandwidth is 4.5MHz (–3dB), supporting accurate digitization of signals up to ~37.5kHz under Nyquist criteria.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete output codes over full-scale range. |
| Throughput Rate | 75ksps - supports real-time sampling of signals ≤37.5kHz without aliasing under Nyquist. |
| Integral Nonlinearity | ±½ LSB (MAX187A grade) - ensures monotonicity and <0.012% full-scale error after calibration. |
| Reference Voltage | 4.096V internal (buffered, ±0.5% at +25°C) - matches 1mV/LSB scaling for simplified system-level scaling. |
| Supply Current | 1.5mA typical operating / 2µA shutdown - enables battery-powered operation with rapid wake-up (2µs). |
| Input Range | 0V to VREF (unipolar) - eliminates need for level-shifting circuitry when using internal reference. |
| Serial Interface | 3-wire (CS, SCLK, DOUT), SPI/QSPI/MICROWIRE-compatible - interfaces directly with most microcontrollers without glue logic. |
Pinout & Package
MAX187BEPA is housed in an 8-pin plastic dual-inline package (PDIP), with pins arranged in standard DIP layout. All pins are electrically defined per Maxim's official pin description; no NC pins are internally connected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VDD | Positive supply rail | +5V ±5% main power input; decoupling capacitor required near pin. |
| 2 - AIN | Analog input | Single-ended unipolar input node (0V to VREF); 16pF input capacitance requires low-impedance drive. |
| 3 - SHDN | Three-state shutdown control | Pull high → enable internal reference; float → disable internal reference; pull low → enter 2µA shutdown mode. |
| 4 - REF | Reference voltage terminal | Outputs 4.096V when internal reference enabled; accepts external 2.5V–VDD reference when disabled. |
| 5 - GND | Analog/digital common ground | Single ground connection for both analog and digital sections (no separate AGND/DGND in PDIP version). |
| 6 - DOUT | Serial data output | 3-wire interface output; MSB-first format with leading EOC bit; transitions on SCLK falling edge. |
| 7 - CS | Active-low chip select | Falling edge initiates conversion; high state places DOUT in high-impedance mode. |
| 8 - SCLK | Serial clock input | Accepts external clock up to 5MHz; duty cycle unrestricted if ≥100ns per phase. |
Key Features
| Feature | Design Value |
|---|---|
| On-chip 4.096V buffered reference | Laser-trimmed ±0.5% accuracy at +25°C; tempco ≤60ppm/°C (MAX187E grade); eliminates external reference IC and reduces BOM count. |
| Internal track/hold with 1.5µs acquisition | Removes need for external hold capacitor and driver op-amp; supports source impedances ≤5kΩ without AC performance degradation. |
| 75ksps throughput with 8.5-cycle conversion | Fixed latency enables deterministic timing in closed-loop control systems; compatible with µC interrupt-driven readout. |
| 2µA shutdown current | Reduces average power in duty-cycled sensing nodes; wake-up time is 2µs (MAX187 only) - faster than external-reference alternatives. |
| SPI/QSPI/MICROWIRE compatibility | Requires only three digital lines (CS/SCLK/DOUT); no mode configuration needed - CPOL=0, CPHA=0 works out-of-box. |
Applications
| Portable Data Logging | Remote Digital Signal Processing |
|---|---|
Use Scenario: Battery-powered environmental sensor node acquiring temperature, humidity, and pressure at 10–50Hz with local preprocessing. IC Role / Device Role / Timing Role: Primary ADC capturing conditioned analog sensor outputs; provides 12-bit resolution with minimal power overhead during active sampling bursts. Use Value: 2µA shutdown current extends battery life; internal 4.096V reference avoids drift-prone external components; 8-pin PDIP simplifies PCB layout in space-constrained enclosures. |
Use Scenario: Edge-processing module in industrial telemetry system digitizing vibration or acoustic signals before FFT-based feature extraction. IC Role / Device Role / Timing Role: High-fidelity front-end ADC feeding data to low-power DSP; synchronized via CS-triggered conversions and SCLK-controlled readout. Use Value: 75ksps throughput supports >37kHz signal content; 4.5MHz small-signal bandwidth preserves transient fidelity; SPI compatibility enables direct µC interface without protocol translation. |
| Isolated Data Acquisition | High-Accuracy Process Control |
Use Scenario: Opto-isolated analog input card for PLC I/O module measuring 4–20mA loop signals with galvanic separation. IC Role / Device Role / Timing Role: Isolated-side ADC converting conditioned current-loop voltage; referenced to local isolated 4.096V source. Use Value: Internal reference eliminates need for isolated reference distribution; ±½ LSB INL ensures <0.012% linearity error across temperature; 8.5-cycle conversion enables tight timing control in cyclic scan architectures. |
Use Scenario: Closed-loop feedback controller in precision temperature oven regulating heater via PID algorithm running on embedded MCU. IC Role / Device Role / Timing Role: Real-time analog monitor of thermistor/RTD bridge output; sampled synchronously with control update period. Use Value: 1.5µs track/hold acquisition ensures stable sampling of fast-settling bridge outputs; unipolar 0–4.096V range maps directly to 0–100% setpoint; low 1.5mA supply current minimizes self-heating effects. |
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 |
|---|---|---|---|
| MAX187CEPA | Same pinout and function, but specified for 0°C to +70°C (vs. –40°C to +85°C for MAX187BEPA); ±1 LSB INL (vs. ±½ LSB) | Suitable for commercial-grade instrumentation where extended temperature range is not required | Select MAX187CEPA only if ambient operating temperature stays within 0°C–70°C and ±1 LSB INL meets system linearity budget. |
| ADS7822U | TI 12-bit SAR ADC; 200ksps max; requires external reference; 6-pin SOT-23 package; no internal T/H | Better speed and smaller footprint, but demands external reference design and external T/H or low-Z driver | Choose ADS7822U when higher throughput (200ksps) justifies added external component complexity and layout effort. |
Compared with MAX187CEPA, the MAX187BEPA offers wider temperature range and tighter linearity - critical for industrial field deployment; versus ADS7822U, it trades speed for integration (internal reference + T/H), reducing design risk in cost-sensitive, low-to-mid-speed sensor nodes.
Availability
MAX187BEPA 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 industrial temperature ranges and long production lifecycles.
Supply support for MAX187BEPA 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 MAX187BEPA belongs to Maxim's legacy low-power serial ADC product line, engineered specifically for space- and power-constrained measurement systems needing integrated reference and simple 3-wire interfacing.
FAQ
What is the operating temperature range of the MAX187BEPA?
The MAX187BEPA is rated for –40°C to +85°C ambient operation (Extended temperature grade). This specification is confirmed in Maxim's official datasheet Absolute Maximum Ratings table and applies to all electrical characteristics unless otherwise noted. The 'E' suffix in MAX187BEPA explicitly denotes this extended temperature range, making it suitable for industrial and automotive under-hood environments where thermal stability is critical. The MAX187BEPA maintains ±½ LSB integral nonlinearity across this full range.
Does the MAX187BEPA require an external reference voltage?
No - the MAX187BEPA includes a laser-trimmed, temperature-compensated 4.096V internal reference with buffered output. When the SHDN pin is pulled high, the internal reference is enabled and drives the REF pin. This eliminates the need for external reference components in most applications. The MAX187BEPA can also operate with an external reference (2.5V to VDD) when SHDN is left floating, but that configuration forfeits the benefit of the integrated reference.
How does the MAX187BEPA interface with a microcontroller's SPI port?
The MAX187BEPA connects directly to standard SPI peripherals using CS (chip select), SCLK (serial clock), and DOUT (data out) - no additional logic required. Configure the MCU SPI master with CPOL = 0 and CPHA = 0. A CS falling edge starts conversion; DOUT goes high upon completion (EOC signal); then 13 SCLK falling edges shift out the 12-bit result plus leading EOC bit. The MAX187BEPA does not require MISO/MOSI bidirectional lines - only unidirectional DOUT.
What is the maximum recommended source impedance for the AIN pin on the MAX187BEPA?
Maxim specifies a maximum source impedance of 5kΩ for the AIN pin to maintain full AC performance (e.g., SINAD ≥70dB). This limit arises from the 16pF input capacitance and 1.5µs track/hold acquisition time: tACQ = 9 × (RS + RIN) × 16pF, where RIN = 5kΩ. Exceeding 5kΩ increases acquisition time and may cause missing codes or reduced effective resolution - especially at higher input frequencies or temperatures.
Can the MAX187BEPA be powered down between conversions to save power?
Yes - the MAX187BEPA supports hardware shutdown via the SHDN pin. Pulling SHDN low reduces supply current to ≤2µA (typical), enabling ultra-low-power operation in battery-powered systems. Wake-up time is only 2µs, allowing rapid resumption of sampling. During shutdown, the internal reference is disabled and DOUT enters high-impedance state. This feature is fully characterized and guaranteed across the –40°C to +85°C range for the MAX187BEPA.
MAX187BEPA 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:
- -
MAX187BEPA FAQ
1.How can I place an order for MAX187BEPA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX187BEPA 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 MAX187BEPA reliable?
The price and inventory of MAX187BEPA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX187BEPA is usually 5 days.
3.What payment methods are accepted for MAX187BEPA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX187BEPA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX187BEPA?
MAX187BEPA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX187BEPA 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 MAX187BEPA?
For technical support, including MAX187BEPA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX187BEPA requirements.
6.How does Aetrix verify that MAX187BEPA is sourced from the original manufacturer or authorized distributors?
All MAX187BEPA 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 MAX187BEPA meets industry standards.
7.What is the process for return or replacement of MAX187BEPA?
All MAX187BEPA units undergo pre-shipment inspection (PSI). If there is an issue with MAX187BEPA, 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 MAX187BEPA part is unused and in its original packaging.
Return procedure for MAX187BEPA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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