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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:2,678
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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 0 to 5V unipolar analog input with internal track/hold, 75ksps throughput, and SPI/QSPI/MICROWIRE-compatible 3-wire serial interface. It requires an external reference voltage (2.5V to VDD), targets low-power sensor and remote data acquisition systems.
For engineers reviewing the MAX189ACWE+ datasheet, MAX189ACWE+ pinout, MAX189ACWE+ application, or MAX189ACWE+ equivalent, key selection criteria include external reference dependency, 16-pin wide SO package, 1.0–2.0mA operating current, ±1 LSB integral nonlinearity (A-grade), and shutdown current ≤10µA - all critical for battery-powered or space-constrained embedded measurement designs.
Technical Context
The MAX189ACWE+ implements a 12-bit SAR architecture with integrated track/hold, acquiring signals in 1.5µs and completing conversion in 5.5–8.5µs. Its serial interface operates at up to 5MHz clock rate, supports unipolar mode only, and outputs MSB-first data preceded by a high EOC bit over DOUT on SCLK falling edges.
It lacks an internal reference buffer - REF pin accepts 2.5V to VDD external reference with 12–20kΩ input resistance and ≤350µA load current during conversion. Analog input (AIN) features 16pF capacitance and ±0.3V absolute max rating beyond supplies, requiring anti-alias filtering for inputs >37.5kHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete digital codes across full-scale range. |
| Integral Nonlinearity | ±1 LSB (MAX189A grade) - ensures monotonicity and <0.024% full-scale error after calibration. |
| Throughput Rate | 75 ksps - supports real-time sampling of signals up to 37.5 kHz (Nyquist-limited) without aliasing. |
| Supply Current | 1.0–2.0 mA (operating), ≤10 µA (shutdown) - enables microamp-level sleep modes in portable instrumentation. |
| Reference Input Range | 2.50 V to VDD (+5.25 V) - allows flexible precision reference selection (e.g., REF5025, LT1019) with 12 kΩ min input impedance. |
| SINAD / THD | 70 dB / –80 dB (10 kHz sine, 75 ksps) - supports >11.6 effective bits at audio-band frequencies. |
| Small-Signal Bandwidth | 4.5 MHz - permits accurate digitization of fast transients and undersampling applications. |
Pinout & Package
MAX189ACWE+ is housed in a 16-pin wide SO (SOIC-W) package with exposed pad (not electrically connected). Pin functions are validated per Maxim's official pin configuration diagram and datasheet Table "Pin Description".
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 1) | Power supply input | +5V ±5% main supply; decoupling capacitor required near pin for noise immunity. |
| AIN (Pin 3) | Analog input | 0 to VREF unipolar sampling node; 16pF input capacitance dictates drive strength requirements. |
| SHDN (Pin 6) | Three-level shutdown control | Pull low for ≤10µA shutdown; float or high for active operation (no internal reference enable). |
| REF (Pin 8) | External reference input | Accepts 2.5V–5.25V reference; 12–20kΩ input resistance; bypass with 0.1µF ceramic capacitor. |
| AGND (Pin 10) | Analog ground | Return path for AIN and REF; must be separated from DGND and tied at single point. |
| DGND (Pin 11) | Digital ground | Return path for DOUT, SCLK, CS; isolation prevents digital noise coupling into analog section. |
| DOUT (Pin 12) | Serial data output | Three-state CMOS output; data valid on SCLK falling edge; MSB-first format with leading EOC bit. |
| CS (Pin 15) | Active-low chip select | Falling edge initiates conversion; high impedance disables DOUT; minimum pulse width 500 ns. |
| SCLK (Pin 16) | Serial clock input | Drives data readout; supports 0–5 MHz; duty cycle unrestricted if ≥100 ns per phase. |
Key Features
| Feature | Design Value |
|---|---|
| Single-supply +5V operation | Eliminates need for dual-rail supplies or level shifters in 5V microcontroller-based systems. |
| 3-wire SPI/QSPI/MICROWIRE interface | Reduces GPIO count vs. parallel ADCs; compatible with most MCU hardware serial peripherals without glue logic. |
| On-chip track/hold with 1.5µs acquisition | Removes requirement for external sample-and-hold circuitry and simplifies front-end design. |
| 75ksps throughput with 8.5µs max conversion time | Enables deterministic timing control in real-time control loops and synchronized data logging. |
| ≤10µA shutdown current | Extends battery life in intermittent-sampling applications such as environmental sensors or metering. |
Applications
| Portable Data Logging | Remote Digital Signal Processing |
|---|---|
Use Scenario: Battery-powered field sensor nodes recording temperature, pressure, or vibration over hours/days. IC Role / Device Role / Timing Role: Primary ADC capturing analog sensor outputs at configurable intervals; interfaces directly to low-power MCU via SPI. Use Value: 10µA shutdown current and 75ksps burst capability enable energy-efficient wake-sense-log-sleep cycles without external power management. |
Use Scenario: Edge-processing modules in distributed industrial monitoring, digitizing analog feedback before local FFT or filtering. IC Role / Device Role / Timing Role: High-fidelity signal digitizer feeding DSP engine; uses 4.5MHz small-signal bandwidth to preserve transient integrity. Use Value: 70dB SINAD and –80dB THD ensure minimal distortion in spectral analysis of motor currents or acoustic signatures. |
| Isolated Data Acquisition | High-Accuracy Process Control |
Use Scenario: Safety-critical plant instrumentation where analog inputs are galvanically isolated using optocouplers or digital isolators. IC Role / Device Role / Timing Role: Isolated-side ADC converting sensor signals post-isolation; driven by isolated SCLK/CS lines. Use Value: 3-wire interface minimizes isolation channel count; 1.5µs track/hold acquisition reduces timing skew across isolation barrier. |
Use Scenario: Closed-loop control of thermal, fluidic, or motion systems requiring stable, repeatable analog feedback. IC Role / Device Role / Timing Role: Precision measurement front-end for PID controller; referenced to high-stability external voltage source (e.g., REF5025). Use Value: ±1 LSB INL and 0.8 ppm/°C gain tempco support sub-0.025% full-scale accuracy over 0°C to +70°C operating range. |
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; 1MSPS max rate; internal reference only; 2.7–5.25V supply. | Higher speed but no external reference option; unsuitable where reference flexibility or ultra-low shutdown current is required. | Select only if system already uses internal reference and needs faster sampling; not drop-in for MAX189ACWE+ reference architecture. |
| AD7490BRUZ | 12-bit, 1MSPS, SPI-compatible; external reference support; 2.7–5.25V supply; 350µA typical operating current. | Higher power consumption and larger 20-pin TSSOP package; includes internal FIFO and sequencer. | Prefer when multi-channel scanning or higher throughput is needed; avoid if board space or µA-level shutdown is critical. |
Compared with ADS7816U and AD7490BRUZ, MAX189ACWE+ uniquely balances ultra-low shutdown current (≤10µA), external reference flexibility (2.5V–5.25V), and compact 16-pin SO packaging - making it optimal for long-life, single-channel, reference-customizable measurement nodes.
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, extended temperature support (0°C to +70°C), and long-term industrial availability.
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 family was engineered specifically for low-power, space-constrained 12-bit data acquisition - emphasizing ease of interface, minimal external components, and robust performance in remote or battery-operated systems.
FAQ
What reference voltage does MAX189ACWE+ require?
MAX189ACWE+ requires an external reference voltage applied to the REF pin, ranging from +2.50V to VDD (+5.25V). It does not include an internal reference buffer. For optimal accuracy, use a precision reference (e.g., REF5025) with ≤10Ω output impedance and bypass REF with a 0.1µF ceramic capacitor. The MAX189ACWE+ draws up to 350µA from REF during conversion.
What is the operating temperature range of MAX189ACWE+?
MAX189ACWE+ is rated for the commercial temperature range of 0°C to +70°C, as indicated by the 'C' suffix in its ordering code. This is confirmed in the Absolute Maximum Ratings table and Typical Operating Characteristics plots. It is not qualified for extended (–40°C to +85°C) or military-grade operation.
How does the MAX189ACWE+ serial interface connect to an SPI host?
MAX189ACWE+ connects to an SPI host using three lines: CS (active-low chip select), SCLK (serial clock), and DOUT (data out). Configure the host SPI peripheral with CPOL = 0 and CPHA = 0. Initiate conversion with CS falling edge; read 13 bits (1 EOC + 12 data bits, MSB first) on SCLK falling edges. No MISO or MOSI bidirectional logic is needed - DOUT is output-only.
Can MAX189ACWE+ operate with a 3.3V supply?
No - MAX189ACWE+ is specified only for +5V ±5% (4.75V to 5.25V) operation. Its absolute maximum VDD rating is +6V, but electrical characteristics (INL, SINAD, throughput) are guaranteed exclusively at VDD = 5V ±5%. Using 3.3V violates the supply specification and will result in undefined behavior or failure to convert.
What is the minimum acquisition time between conversions for MAX189ACWE+?
The minimum acquisition time (tACQ) for MAX189ACWE+ is 1.5µs, as specified in the Timing Characteristics table. This is the shortest interval required after CS goes high before the next CS falling edge can reliably initiate a new conversion. Shorter intervals risk incomplete signal settling and degraded INL/DNL performance.
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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