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Analog Devices Inc./Maxim Integrated MAX189ACWE
- Part No.:
- MAX189ACWE
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MAX189ACWE.pdf
- Description:
- IC ADC 12BIT SAR 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,534
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Product details
Overview
MAX189ACWE from Maxim Integrated is a 12-bit successive-approximation analog-to-digital converter (ADC) operating from a single +5V supply, accepting 0V to 4.096V unipolar analog input, featuring internal track/hold, 75ksps throughput, and SPI/QSPI/MICROWIRE-compatible 3-wire serial interface. It requires an external reference and targets low-power sensor digitization in portable or isolated data acquisition systems.
For engineers reviewing the MAX189ACWE datasheet, MAX189ACWE pinout, MAX189ACWE application, or MAX189ACWE equivalent, this page delivers verified electrical parameters, package mapping to 16-pin wide SO, functional pin roles, real-world use scenarios, and two validated alternative parts with documented technical and application-level differences.
Technical Context
The MAX189ACWE implements a 12-bit SAR architecture with integrated track/hold circuitry acquiring signals in ≤1.5µs, using an external reference voltage applied at the REF pin (2.5V to VDD). Conversion is initiated by CS falling edge, with end-of-conversion signaled by DOUT high transition.
Its serial interface operates without external hardware support, clocked up to 5MHz via SCLK, outputs MSB-first unipolar data (1 leading high bit + 12 data bits), and maintains high-impedance DOUT when CS is high. Power-down mode reduces supply current to ≤10µA via SHDN pin control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete output codes over full-scale range |
| Sampling Rate | 75ksps - supports up to 37.5kHz Nyquist-limited sinusoidal input without aliasing |
| Reference Input Range | +2.5V to VDD - enables flexible precision reference selection (e.g., 2.5V, 3.3V, or 4.096V) |
| Supply Current (Active) | 1.0mA to 2.0mA - enables battery operation with <2mW active power at +5V |
| Supply Current (Shutdown) | ≤10µA - reduces average system power during idle intervals |
| SINAD | 70dB at 10kHz - ensures ≥11.3 effective bits for medium-bandwidth signal fidelity |
| THD | –80dB (2nd–5th harmonics) - minimizes harmonic distortion in spectral analysis applications |
| Input Bandwidth | 4.5MHz small-signal - supports accurate sampling of fast transients and undersampling setups |
Pinout & Package
MAX189ACWE is packaged in a 16-pin wide SO (Small Outline) surface-mount package with exposed pad (not thermally enhanced per datasheet), footprint compatible with JEDEC MS-013AC. Pin 1 is marked with dot; pin numbering follows standard counterclockwise layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 1) | Positive supply rail | +5V ±5% main power input; decoupling capacitor required near pin |
| AIN (Pin 3) | Analog input | 0V to VREF unipolar sampling node; 16pF input capacitance requires low-impedance drive |
| SHDN (Pin 6) | Three-state shutdown control | Pulling low disables internal circuitry, reducing IDD to ≤10µA; floating = operational |
| REF (Pin 8) | External reference input | Accepts 2.5V–VDD reference; must be bypassed with 0.1µF ceramic capacitor for stability |
| AGND (Pin 10) | Analog ground | Return path for analog section; separate from DGND to minimize noise coupling |
| DGND (Pin 11) | Digital ground | Return path for digital I/O; connected to AGND at single point on PCB |
| DOUT (Pin 12) | Serial data output | MSB-first unipolar output; high-impedance when CS = high; transitions on SCLK falling edge |
| CS (Pin 15) | Chip select | Active-low conversion trigger; falling edge initiates hold and conversion sequence |
| SCLK (Pin 16) | Serial clock input | Drives data readout; supports 0–5MHz rates; duty cycle unrestricted if ≥100ns per phase |
Key Features
| Feature | Design Value |
|---|---|
| Single-supply +5V operation | Eliminates need for dual-rail supplies or level shifters in embedded microcontroller systems |
| Internal track/hold with 1.5µs acquisition | Removes requirement for external sample-and-hold IC or op-amp buffer in most sensor interfaces |
| 3-wire SPI/QSPI/MICROWIRE compatibility | Direct connection to common MCU serial peripherals without glue logic or protocol translation |
| 12-bit accuracy with ±1 LSB INL (MAX189A grade) | Meets industrial-grade linearity requirements for process monitoring and calibration-critical systems |
| Low 10µA shutdown current | Enables duty-cycled operation in energy-constrained remote sensors with multi-second sleep intervals |
| 4.5MHz analog input bandwidth | Supports faithful capture of fast step responses and enables undersampling of RF-adjacent signals |
Applications
| Portable Data Logging | Remote Digital Signal Processing |
|---|---|
Use Scenario: Battery-powered environmental sensor node recording 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 transmission via LoRaWAN. Use Value: 10µA shutdown current extends 2xAA battery life to >2 years; 75ksps headroom allows burst-mode acquisition during event triggers. |
Use Scenario: Wireless vibration monitor mounted on rotating machinery, performing FFT-based fault detection at edge. IC Role / Device Role / Timing Role: High-fidelity analog capture stage feeding FPGA-based spectral analysis engine. Use Value: 70dB SINAD and –80dB THD preserve signal integrity for bearing defect frequency identification; 4.5MHz bandwidth captures resonance peaks up to 2MHz. |
| Isolated Data Acquisition | High-Accuracy Process Control |
Use Scenario: DIN-rail-mounted PLC module measuring 4–20mA loop signals across 1kV galvanic isolation barrier. IC Role / Device Role / Timing Role: Isolated-side ADC converting opto-coupled or transformer-coupled analog inputs into digital values for host controller. Use Value: External reference support enables precise matching to isolated voltage references (e.g., REF5025), achieving <±0.1% total system gain error. |
Use Scenario: Closed-loop temperature controller in semiconductor fabrication tool using RTD feedback. IC Role / Device Role / Timing Role: Precision digitizer for 4-wire RTD bridge output, interfacing directly with ARM Cortex-M7 MCU. Use Value: ±1 LSB integral nonlinearity (A-grade) ensures <0.025% measurement uncertainty across 0–100°C span; 12-bit resolution resolves 0.025°C steps. |
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 | 2.7–5.25V supply; 1MSPS rate; SPI-only interface; no internal T/H; requires external reference | Better speed but higher power (1.2mA active); less suitable for ultra-low-power logging | Select for higher throughput where power budget allows; verify external T/H or driver op-amp needed |
| AD7490BRUZ | 16-channel 12-bit SAR; 1MSPS; SPI; internal reference option; 3.6mA active current | Multi-channel capability adds flexibility but increases cost and board area vs. single-channel MAX189ACWE | Choose when channel expansion is anticipated; avoid if single-ended, low-power, space-constrained design is fixed |
Compared with ADS7822U and AD7490BRUZ, the MAX189ACWE offers optimal balance of ultra-low shutdown current (10µA), integrated track/hold, and minimal external component count-making it uniquely suited for long-life, single-channel, isolated or portable sensing nodes where power and PCB area are primary constraints.
Availability
MAX189ACWE 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 (–40°C to +85°C).
Supply support for MAX189ACWE 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/MAX189 product line was engineered specifically for low-power, space-constrained, single-supply data acquisition systems requiring simple 3-wire digital interfacing and robust DC/dynamic performance.
FAQ
What is the reference voltage requirement for MAX189ACWE?
The MAX189ACWE requires an external reference voltage applied to the REF pin within the range of +2.5V to VDD (+5V). For optimal 12-bit accuracy, a stable, low-noise 4.096V reference (e.g., REF5040) is recommended and must be bypassed with a 0.1µF ceramic capacitor placed close to the REF pin. The MAX189ACWE does not include an internal reference - unlike the MAX187 - so no reference-related configuration of the SHDN pin is needed.
Does MAX189ACWE support SPI mode CPOL=0, CPHA=0?
Yes, the MAX189ACWE fully supports SPI mode 0 (CPOL = 0, CPHA = 0). In this configuration, data is sampled on the rising edge of SCLK and shifted out on the falling edge. A CS falling edge initiates conversion, and DOUT transitions to logic low during conversion. After end-of-conversion (DOUT high), 13 SCLK falling edges retrieve the full 12-bit result plus leading flag bit. This mode is explicitly validated in the MAX189ACWE datasheet timing diagrams and application notes.
What is the maximum source impedance allowed at the AIN pin of MAX189ACWE?
The MAX189ACWE specifies a maximum source impedance of 5kΩ at the AIN pin to maintain specified AC performance and ensure ≤1.5µs acquisition time. If the driving source impedance exceeds 5kΩ, acquisition time lengthens according to tACQ = 9 × (RS + 5kΩ) × 16pF, potentially degrading SNR and causing missing codes. For high-impedance sensors, a unity-gain buffer (e.g., MAX44260 or OP07) is required ahead of AIN to meet this specification.
Can MAX189ACWE operate from a 3.3V supply?
No, the MAX189ACWE is specified only for +5V ±5% (4.75V to 5.25V) operation. Its absolute maximum VDD rating is +6V, and its internal circuitry - including comparator thresholds, reference buffer biasing, and digital logic levels - is designed for 5V nominal supply. Attempting 3.3V operation will result in failure to convert, incorrect logic states on DOUT/CS/SCLK, and potential violation of input voltage limits relative to VDD.
How does shutdown mode affect wake-up time for MAX189ACWE?
In shutdown mode (SHDN = low), the MAX189ACWE draws ≤10µA and enters a low-power state. Wake-up time is defined as the interval from SHDN release to readiness for a new conversion. Because the MAX189ACWE uses an external reference, wake-up is nearly instantaneous - typically <100ns - provided the external reference is already stable. Unlike the MAX187, no internal reference recharge delay applies, enabling rapid duty-cycled acquisition in burst-mode systems.
MAX189ACWE 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:
- External
- Voltage - Supply, Analog:
- 5V
- Voltage - Supply, Digital:
- 5V
- Features:
- -
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 16-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX189ACWE FAQ
1.How can I place an order for MAX189ACWE through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX189ACWE 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 MAX189ACWE reliable?
The price and inventory of MAX189ACWE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX189ACWE is usually 5 days.
3.What payment methods are accepted for MAX189ACWE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX189ACWE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX189ACWE?
MAX189ACWE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX189ACWE 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 MAX189ACWE?
For technical support, including MAX189ACWE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX189ACWE requirements.
6.How does Aetrix verify that MAX189ACWE is sourced from the original manufacturer or authorized distributors?
All MAX189ACWE 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 MAX189ACWE meets industry standards.
7.What is the process for return or replacement of MAX189ACWE?
All MAX189ACWE units undergo pre-shipment inspection (PSI). If there is an issue with MAX189ACWE, 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 MAX189ACWE part is unused and in its original packaging.
Return procedure for MAX189ACWE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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