My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX187BEWE
- Part No.:
- MAX187BEWE
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MAX187BEWE.pdf
- Description:
- IC ADC 12BIT SAR 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,933
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX187BEWE 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 unipolar 0V to 4.096V input range, features 1.5µs track/hold acquisition time, and draws only 1.5mA typical operating current - ideal for battery-powered sensor nodes and remote data acquisition systems.
For engineers reviewing the MAX187BEWE datasheet, MAX187BEWE pinout, MAX187BEWE application, or MAX187BEWE equivalent, this page delivers verified technical context, exact pin functions, real-world use cases, and validated alternative options - all grounded in Maxim's official documentation for the MAX187BEWE variant (8-pin PDIP, extended temperature range –40°C to +85°C, grade B accuracy).
Technical Context
The MAX187BEWE implements an 8.5-clock-cycle SAR architecture with on-chip track/hold and internal bandgap reference trimmed to 4.096V ±0.5%. Its conversion sequence is initiated by CS falling edge, completes in ≤8.5µs, and outputs 13-bit serial stream (1 EOC bit + 12 MSB-first data bits) synchronized to external SCLK up to 5MHz.
SHDN pin provides three-level control: pulled high enables internal reference; floating disables it for external reference use; pulled low reduces supply current to ≤10µA. Analog input AIN exhibits 16pF capacitance and supports source impedances ≤5kΩ without AC performance degradation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete output codes over full-scale range. |
| Integral Nonlinearity | ±1 LSB (MAX187B grade) - ensures monotonicity and <0.025% full-scale error after calibration. |
| Throughput Rate | 75 ksps - supports real-time sampling of signals up to 37.5 kHz (Nyquist-limited) without aliasing. |
| Reference Voltage | 4.096 V (internal, buffered) - provides precise 1 mV/LSB scaling and can source up to 0.6 mA for external circuitry. |
| Supply Current | 1.5 mA (typical operating), 10 µA (max shutdown) - enables ultra-low-power duty-cycled operation in portable systems. |
| SINAD | 70 dB at 10 kHz input - corresponds to ~11.4 effective bits, suitable for medium-fidelity signal digitization. |
| Input Range | 0 V to VREF (4.096 V) - unipolar operation simplifies sensor interfacing with ratiometric or ground-referenced sources. |
Pinout & Package
MAX187BEWE is housed in an 8-pin plastic DIP (PDIP) package with 0.3-inch body width and through-hole mounting. Pin functions are electrically and physically identical across MAX187 variants; no thermal pad or exposed die attach.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VDD) | Positive supply rail | +5 V ±5% power input; decoupling capacitor required near pin for stable ADC operation. |
| 2 (AIN) | Analog input terminal | Accepts 0 V to 4.096 V unipolar signal; 16 pF input capacitance requires low-impedance drive (≤5 kΩ source Z). |
| 3 (SHDN) | Three-state shutdown control | Pull high → enable internal reference; float → disable reference for external use; pull low → enter 10 µA shutdown mode. |
| 4 (REF) | Reference voltage node | Outputs 4.096 V when internal ref enabled; accepts 2.5 V to VDD external reference when disabled. |
| 5 (GND) | Common analog/digital ground | Single ground connection point; must be low-impedance and star-connected to minimize noise coupling. |
| 6 (DOUT) | Serial data output | 3-wire SPI-compatible output; logic-high EOC pulse followed by 12-bit MSB-first data on SCLK falling edge. |
| 7 (CS) | Active-low chip select | Falling edge initiates conversion; rising edge places DOUT in high-impedance state; minimum pulse width 500 ns. |
| 8 (SCLK) | Serial clock input | External clock up to 5 MHz; clocks data out post-conversion; duty cycle unrestricted if ≥100 ns per phase. |
Key Features
| Feature | Design Value |
|---|---|
| On-chip 4.096V buffered reference | Eliminates need for external precision reference IC and associated layout complexity in space-constrained designs. |
| 1.5 µs track/hold acquisition time | Enables accurate sampling of fast-rising transients and supports high channel density in multiplexed systems. |
| 3-wire serial interface (SPI/QSPI/MICROWIRE) | Reduces microcontroller GPIO count and eliminates parallel bus routing; compatible with most embedded MCUs out-of-box. |
| 2 µA max shutdown current | Permits aggressive power cycling in battery-operated devices - e.g., 1-second wake/sleep cycles yield average current <100 µA. |
| –40°C to +85°C operating range (E-grade) | Validated for industrial environments including motor controls, HVAC sensors, and outdoor instrumentation. |
Applications
| Portable Data Logging | Remote Digital Signal Processing |
|---|---|
Use Scenario: Battery-powered environmental sensor node logging temperature, humidity, and pressure every 10 seconds. IC Role / Device Role / Timing Role: Primary ADC digitizing conditioned analog outputs from analog front-end op-amps; triggered via MCU GPIO-controlled CS. Use Value: 1.5 mA operating current and 10 µA shutdown extend AA battery life beyond 2 years; internal 4.096V reference ensures consistent LSB size across temperature. |
Use Scenario: Wireless vibration monitor mounted on rotating machinery, transmitting FFT-coefficient packets over LoRaWAN. IC Role / Device Role / Timing Role: High-fidelity analog capture stage feeding DSP algorithm; 75 ksps rate supports 37.5 kHz bandwidth for bearing fault detection. Use Value: 70 dB SINAD and 11.4 ENOB preserve spectral integrity for accurate envelope analysis; 3-wire interface minimizes PCB trace count in compact enclosure. |
| Isolated Data Acquisition | High-Accuracy Process Control |
Use Scenario: DIN-rail-mounted PLC module acquiring 4–20 mA loop signals across 16 channels using opto-isolated inputs. IC Role / Device Role / Timing Role: Channel-specific ADC behind isolation barrier; SHDN pin used to synchronize conversions across multiple MAX187BEWE units. Use Value: Single-supply +5V operation simplifies isolated DC/DC design; 1 LSB INL ensures <0.025% measurement uncertainty critical for safety interlocks. |
Use Scenario: Closed-loop temperature controller in semiconductor fabrication tool regulating heater zones with <±0.1°C stability. IC Role / Device Role / Timing Role: Precision feedback ADC measuring thermocouple amplifier output; referenced to internal 4.096V for ratiometric immunity to supply drift. Use Value: 4.096V reference yields exact 1 mV/LSB scaling - enabling direct integer math in PID firmware without floating-point overhead or calibration lookup tables. |
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 | 2.7–5.25 V supply; 1 MSPS throughput; no internal reference; requires external REF. | Better speed but higher power (1.2 mA active); lacks integrated reference - needs external REF IC or resistor divider. | Select when >100 ksps sampling is required and board space allows external reference design. |
| MAX11131AUT+T | 12-bit, 500 ksps, internal 2.048 V reference, SPI-only interface, 6-pin SOT23 package. | Smaller footprint and higher speed, but lower reference voltage limits dynamic range; not drop-in due to different pinout and voltage scale. | Prefer for ultra-compact, high-throughput designs where 2.048 V full-scale is acceptable and SOT23 assembly is supported. |
Compared with ADS7822U and MAX11131AUT+T, the MAX187BEWE uniquely balances low power (1.5 mA), integrated 4.096 V reference, and proven industrial reliability in PDIP packaging - making it optimal for cost-sensitive, space-constrained, and battery-operated measurement systems requiring minimal external components.
Availability
MAX187BEWE 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.
Supply support for MAX187BEWE 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 U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, automotive, and communications markets.
The MAX187BEWE belongs to Maxim's legacy precision data converter product line, designed specifically for low-power, single-supply, serial-interface ADC applications in resource-constrained embedded systems.
FAQ
What is the operating temperature range for the MAX187BEWE?
The MAX187BEWE is rated for –40°C to +85°C (E-grade), validated across this full industrial temperature range per Maxim's datasheet. This specification applies to all electrical parameters including INL, gain error, and reference voltage stability - ensuring reliable operation in harsh environments such as factory floors or outdoor telemetry enclosures. The MAX187BEWE part number explicitly denotes the E-grade temperature capability.
Does the MAX187BEWE require an external reference voltage?
No, the MAX187BEWE includes a laser-trimmed, temperature-compensated 4.096 V internal reference that is enabled by pulling the SHDN pin high. When SHDN is left floating, the internal reference is disabled and the device accepts an external reference between +2.5 V and VDD at the REF pin. This dual-mode flexibility eliminates mandatory external reference components in most designs while retaining optionality for higher-precision or custom-voltage applications.
How does the MAX187BEWE interface with an SPI host controller?
The MAX187BEWE supports SPI protocol with CPOL = 0 and CPHA = 0. A conversion is initiated by the CS falling edge; after ≤8.5 µs, DOUT goes high to signal end-of-conversion (EOC). The host then clocks out 13 bits (1 EOC bit + 12 data bits, MSB first) on SCLK falling edges. The MAX187BEWE requires no additional level-shifting or timing glue logic when interfaced with standard 3.3 V or 5 V SPI masters.
What is the maximum allowable source impedance for the AIN pin on the MAX187BEWE?
The MAX187BEWE AIN pin has 16 pF input capacitance and is specified for optimal performance with source impedances ≤5 kΩ. Higher impedances increase track/hold acquisition time (tACQ = 9 × (RS + 5 kΩ) × 16 pF) and may degrade AC accuracy. For sources >5 kΩ, an external op-amp buffer (e.g., MAX427 or OP27) is recommended. This limit is explicitly defined in the MAX187BEWE datasheet's "Analog Input" section and confirmed in Figure 4's equivalent input circuit.
Can the MAX187BEWE be powered down between conversions to save energy?
Yes, the MAX187BEWE supports hardware shutdown via the SHDN pin: pulling SHDN low reduces supply current to ≤10 µA while preserving register state. Wake-up time is 2 µs (tWAKE) - allowing rapid resumption of conversion. This feature is fully characterized in the MAX187BEWE datasheet's "Shutdown" section and enables µA-level average current in duty-cycled sensor systems, directly extending battery life in portable applications.
MAX187BEWE 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:
- -
MAX187BEWE FAQ
1.How can I place an order for MAX187BEWE through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX187BEWE 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 MAX187BEWE reliable?
The price and inventory of MAX187BEWE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX187BEWE is usually 5 days.
3.What payment methods are accepted for MAX187BEWE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX187BEWE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX187BEWE?
MAX187BEWE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX187BEWE 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 MAX187BEWE?
For technical support, including MAX187BEWE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX187BEWE requirements.
6.How does Aetrix verify that MAX187BEWE is sourced from the original manufacturer or authorized distributors?
All MAX187BEWE 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 MAX187BEWE meets industry standards.
7.What is the process for return or replacement of MAX187BEWE?
All MAX187BEWE units undergo pre-shipment inspection (PSI). If there is an issue with MAX187BEWE, 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 MAX187BEWE part is unused and in its original packaging.
Return procedure for MAX187BEWE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX187BEWE Tags
-
ADC081C021CIMKX/NOPB
Texas Instruments
-
MCP3021A5T-E/OT
Microchip Technology
-
TLA2024IRUGR
Texas Instruments
-
MCP3221A5T-E/OT
Microchip Technology
-
MCP3221A5T-I/OT
Microchip Technology
-
MCP3221A4T-E/OT
Microchip Technology
-
MCP3221A6T-E/OT
Microchip Technology
-
MCP3221A0T-E/OT
Microchip Technology
-
MCP3221A1T-E/OT
Microchip Technology
-
ADC121S021CIMFX/NOPB
Texas Instruments
-
MCP3001-I/MS
Microchip Technology
-
MCP3001-I/SN
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
