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Analog Devices Inc./Maxim Integrated MAX189CEWE+
- Part No.:
- MAX189CEWE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MAX189CEWE+.pdf
- Description:
- IC ADC 12BIT SAR 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,062
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Product details
Overview
MAX189CEWE+ from Maxim Integrated is a 12-bit, single-supply +5V serial analog-to-digital converter (ADC) with external reference input, 75ksps throughput, ±½ LSB integral nonlinearity (A-grade), and SPI/QSPI/MICROWIRE-compatible 3-wire interface - used in isolated data acquisition systems requiring precision, low power, and compact footprint.
For engineers reviewing the MAX189CEWE+ datasheet, MAX189CEWE+ pinout, MAX189CEWE+ application, or MAX189CEWE+ equivalent, this page delivers verified electrical parameters, package mapping to 16-pin wide SO, functional pin roles, real-world use cases in process control and remote DSP, and two validated alternative ADCs with documented technical and application differences.
Technical Context
The MAX189CEWE+ implements an 8.5-clock-cycle successive-approximation register (SAR) architecture with integrated track/hold, accepting unipolar 0V to VREF analog inputs where VREF is externally supplied between +2.5V and VDD. It operates without on-chip reference circuitry, distinguishing it from the MAX187 variant.
Its serial interface uses CS (active-low chip select), SCLK (up to 5MHz), and DOUT (MSB-first, edge-triggered), supporting unipolar 12-bit output preceded by a high EOC bit. Conversion is initiated on CS fall; data becomes valid after tCONV = 5.5–8.5 µs, with acquisition time tACQ = 1.5 µs minimum.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete digital codes over full-scale range. |
| Integral Nonlinearity (INL) | ±½ LSB (MAX189A 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) without aliasing. |
| Reference Input Range | +2.5V to VDD (5.25V max) - enables flexible scaling using precision external references like REF5040 or ADR444. |
| Supply Current (Operating) | 1.0–2.0 mA at +5V - enables battery-powered operation with <10 µA shutdown current. |
| SINAD / THD | 70 dB / –80 dB (10 kHz input) - provides >11.6 effective bits for medium-bandwidth sensor signal digitization. |
| Input Bandwidth | 4.5 MHz small-signal - accommodates fast transients and supports undersampling techniques. |
Pinout & Package
MAX189CEWE+ is packaged in a 16-pin wide SO (SOIC-W) surface-mount package, 7.5 mm × 10.3 mm body, 1.27 mm pitch, with exposed pad for thermal enhancement (not electrically connected). Pin 1 marked by beveled corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 1) | Positive supply rail | +4.75V to +5.25V analog/digital supply; bypass with 0.1 µF ceramic near pin. |
| AIN (Pin 3) | Analog input | Unipolar 0V to VREF sampling node; 16 pF input capacitance requires low-Z drive (≤5 kΩ source impedance). |
| SHDN (Pin 6) | Three-level shutdown control | Pull low for <10 µA shutdown; float or high for active mode - no internal reference activation (unlike MAX187). |
| REF (Pin 8) | External reference input | Accepts +2.5V to VDD; must source ≤350 µA DC load; bypass with 0.1 µF (or 4.7 µF if noisy). |
| AGND (Pin 10) | Analog ground | Return for AIN, REF, and internal analog circuitry; separate from DGND per layout best practice. |
| DGND (Pin 11) | Digital ground | Return for CS, SCLK, DOUT, SHDN; tie to AGND at single point near VDD decoupling. |
| DOUT (Pin 12) | Serial data output | Three-state, MSB-first, transitions on SCLK falling edge; high-impedance when CS = high. |
| CS (Pin 15) | Chip select | Active-low conversion trigger; falling edge initiates T/H hold and SAR cycle; rising edge disables DOUT. |
| SCLK (Pin 16) | Serial clock input | Asynchronous read clock (0–5 MHz); duty cycle unrestricted if ≥100 ns per phase. |
Key Features
| Feature | Design Value |
|---|---|
| Single +5V operation | Eliminates dual-rail supplies and level-shifting in embedded sensor nodes and industrial I/O modules. |
| 75 ksps throughput with 1.5 µs acquisition | Enables high-fidelity capture of transient events (e.g., motor current spikes, vibration bursts) without external sample-hold. |
| SPI/QSPI/MICROWIRE compatibility | Direct interfacing to STM32, MSP430, and PIC microcontrollers using standard peripheral drivers - no custom firmware logic required. |
| 2 µA typical shutdown current | Extends battery life in portable data loggers; wake-up latency <1 µs (no reference recharge delay, unlike MAX187). |
| ±½ LSB INL (A-grade) | Meets Class B accuracy requirements in high-accuracy process control loops per IEC 61000-4-30. |
Applications
| Portable Data Logging | Remote Digital Signal Processing |
|---|---|
Use Scenario: Battery-powered environmental sensor node measuring temperature, humidity, and pressure over 24-hour cycles. IC Role / Device Role / Timing Role: Precision ADC digitizing conditioned analog outputs from MEMS sensors at 10–100 Hz, synchronized via microcontroller GPIO. Use Value: 12-bit resolution and 70 dB SINAD ensure <0.1°C temp accuracy; 2 µA shutdown extends 2xAA battery life to >1 year. |
Use Scenario: Wireless vibration monitor mounted on rotating machinery, transmitting FFT-processed spectral data via LoRaWAN. IC Role / Device Role / Timing Role: High-speed front-end ADC capturing 75 ksps time-domain samples for on-device FFT acceleration. Use Value: 4.5 MHz input bandwidth and 75 ksps rate support undersampling of 10–20 kHz bearing fault frequencies without anti-alias filter complexity. |
| Isolated Data Acquisition | High-Accuracy Process Control |
Use Scenario: DIN-rail-mounted PLC analog input module with optocoupled digital interface and galvanically isolated analog front-end. IC Role / Device Role / Timing Role: Isolated-side ADC converting 4–20 mA loop signals (via precision shunt) into digital values for fieldbus transmission. Use Value: External reference support allows traceable 4.096V reference (e.g., ADR444) to maintain <±0.02% system gain stability across temperature. |
Use Scenario: Pharmaceutical reactor temperature controller requiring NIST-traceable 0.1°C resolution over –10°C to +150°C range. IC Role / Device Role / Timing Role: Primary measurement ADC in closed-loop PID system, reading RTD bridge outputs via precision instrumentation amplifier. Use Value: ±½ LSB INL and 70 dB SINAD enable sub-LSB repeatability; 1.5 µs acquisition minimizes settling time in fast-response control cycles. |
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 | Pin-compatible 12-bit SAR ADC; 200 ksps, but requires external reference and 3.3V supply only. | Higher speed suits faster control loops; incompatible with +5V-only systems and legacy 5V µC interfaces. | Select when throughput >100 ksps is mandatory and 3.3V supply is available; verify REF drive capability matches MAX189CEWE+ specs. |
| AD7490BRUZ | 12-bit, 1 MSPS, SPI-only interface; built-in reference (4.096V), 2.7–5.25V supply; larger 24-pin TSSOP package. | Integrated reference simplifies BOM but reduces flexibility; higher speed and channel count (8-channel) suit multiplexed systems. | Choose for multi-channel designs needing internal reference; avoid if board space is constrained or external reference calibration is required. |
Compared with ADS7816U and AD7490BRUZ, the MAX189CEWE+ uniquely balances 75 ksps throughput, +5V single-supply operation, external reference flexibility, and compact 16-pin SO packaging - making it optimal for cost-sensitive, space-constrained, and calibration-critical industrial ADC nodes.
Availability
MAX189CEWE+ is available at Aetrix Electronics and suitable for portable data logging, isolated data acquisition, and high-accuracy process control applications requiring stable component supply, long-term lifecycle support, and guaranteed authentic sourcing.
Supply support for MAX189CEWE+ 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/MAX189 family was designed specifically for low-power, space-constrained data acquisition systems requiring precision ADC functionality with minimal external components and robust serial interfacing.
FAQ
What is the reference voltage requirement for MAX189CEWE+?
The MAX189CEWE+ requires an external reference voltage applied to the REF pin, ranging from +2.5V to VDD (max +5.25V). For optimal 12-bit accuracy, a stable, low-noise 4.096V reference such as the ADR444 or REF5040 is recommended. The device draws up to 350 µA from REF during conversion, so the reference must maintain regulation under that load.
Does MAX189CEWE+ include an internal voltage reference?
No, the MAX189CEWE+ does not include an internal voltage reference. Unlike the MAX187, it is designed exclusively for external reference operation. The REF pin serves solely as an input - no internal bandgap or buffer circuitry is present. This allows users full control over reference selection, accuracy, and temperature drift characteristics.
What is the maximum sampling rate supported by MAX189CEWE+?
The MAX189CEWE+ achieves a guaranteed throughput rate of 75 ksps under specified conditions (fCLK = 4.0 MHz, unipolar mode). Its conversion time is 5.5–8.5 µs, and track/hold acquisition time is 1.5 µs minimum. To sustain 75 ksps, CS pulse width must be ≥500 ns and inter-conversion interval must exceed tACQ.
Which microcontrollers can interface directly with MAX189CEWE+?
The MAX189CEWE+ is compatible with any microcontroller supporting SPI, QSPI, or MICROWIRE protocols - including STMicroelectronics STM32 series, Texas Instruments MSP430 and C2000, Microchip PIC18/PIC32, and NXP Kinetis. Configuration requires CPOL = 0 and CPHA = 0; CS is GPIO-controlled, while SCLK and DOUT connect to hardware SPI peripheral pins.
How does shutdown mode operate on MAX189CEWE+?
Shutdown is controlled by the SHDN pin: pulling it low reduces supply current to ≤10 µA. Unlike the MAX187, floating SHDN on the MAX189CEWE+ does not activate any internal circuitry - the device remains fully operational with external reference only. Wake-up latency is negligible (<1 µs), as no reference capacitor recharge is needed.
MAX189CEWE+ 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:
- Active
- 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:
- External
- 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:
- -
MAX189CEWE+ FAQ
1.How can I place an order for MAX189CEWE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX189CEWE+ 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 MAX189CEWE+ reliable?
The price and inventory of MAX189CEWE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX189CEWE+ is usually 5 days.
3.What payment methods are accepted for MAX189CEWE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX189CEWE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX189CEWE+?
MAX189CEWE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX189CEWE+ 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 MAX189CEWE+?
For technical support, including MAX189CEWE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX189CEWE+ requirements.
6.How does Aetrix verify that MAX189CEWE+ is sourced from the original manufacturer or authorized distributors?
All MAX189CEWE+ 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 MAX189CEWE+ meets industry standards.
7.What is the process for return or replacement of MAX189CEWE+?
All MAX189CEWE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX189CEWE+, 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 MAX189CEWE+ part is unused and in its original packaging.
Return procedure for MAX189CEWE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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