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Analog Devices Inc./Maxim Integrated MAX189CEPA
- Part No.:
- MAX189CEPA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX189CEPA.pdf
- Description:
- IC ADC 12BIT SAR 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,981
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Product details
Overview
MAX189CEPA 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, featuring internal track/hold, 75ksps throughput, and SPI/QSPI/MICROWIRE-compatible 3-wire serial interface. It requires an external reference voltage and targets low-power sensor digitization in portable or isolated data acquisition systems.
For engineers reviewing the MAX189CEPA datasheet, MAX189CEPA pinout, MAX189CEPA application, or MAX189CEPA equivalent, this page delivers verified technical context, exact pin functions for the 8-pin PDIP package, real-world AC/DC performance metrics, and two validated alternative ADCs with documented functional and application-level differences.
Technical Context
The MAX189CEPA implements a 12-bit SAR architecture with integrated track/hold circuitry, acquiring signals in ≤1.5µs and completing conversions in 5.5–8.5 clock cycles (tCONV). Its serial interface operates at up to 5MHz SCLK, outputs MSB-first unipolar data with leading EOC bit, and requires no external hardware to interface with microcontrollers or DSPs.
Unlike the MAX187, the MAX189CEPA lacks an internal reference and mandates an external 2.5V to VDD reference applied to the REF pin-supporting precision applications where reference stability and sourcing are controlled externally. Shutdown mode reduces supply current to ≤10µA via the SHDN pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR output with no missing codes over temperature |
| Throughput Rate | 75ksps maximum-supports real-time sampling of signals up to 37.5kHz (Nyquist-limited) |
| Reference Input Range | +2.5V to VDD (4.75–5.25V); enables flexible external reference selection |
| Supply Current (Active) | 1.0–2.0mA at +5V-enables battery-powered operation with low quiescent draw |
| Supply Current (Shutdown) | ≤10µA-reduces average power in duty-cycled sensing applications |
| SINAD / THD | 70dB / –80dB at 10kHz input-validates high-fidelity signal capture for DSP preprocessing |
| Input Bandwidth | 4.5MHz small-signal bandwidth-supports accurate sampling of fast transients without external op-amp buffering |
Pinout & Package
MAX189CEPA is packaged in an 8-pin plastic DIP (PDIP) with gull-wing leads, rated for 0°C to +70°C operation (C-grade). Pin numbering follows standard DIP top-view orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 1) | Positive supply rail | +5V ±5% analog/digital supply; must be decoupled locally with 0.1µF ceramic |
| AIN (Pin 2) | Analog input node | 0V to VREF unipolar sampling input; 16pF input capacitance requires low-impedance drive |
| SHDN (Pin 3) | Three-state shutdown control | Pull low for ≤10µA shutdown; float or high for active mode-no pull-up required |
| REF (Pin 4) | External reference input | Accepts 2.5V–5.25V reference; bypass with 0.1µF near pin for noise immunity |
| GND (Pin 5) | Analog/digital common ground | Single ground connection point-separate AGND/DGND not implemented in PDIP variant |
| DOUT (Pin 6) | Serial data output | 3-wire interface output; transitions on SCLK falling edge; high-impedance when CS = high |
| CS (Pin 7) | Chip select (active-low) | Falling edge initiates conversion; rising edge disables DOUT and terminates data transfer |
| SCLK (Pin 8) | Serial clock input | Accepts 0–5MHz clock; duty cycle unrestricted if each phase ≥100ns |
Key Features
| Feature | Design Value |
|---|---|
| Single-supply +5V operation | Eliminates need for dual-rail supplies or level shifters in embedded 5V systems |
| Integrated track/hold | Removes external hold capacitor requirement and simplifies front-end design |
| 3-wire SPI/QSPI/MICROWIRE compatibility | Direct interfacing to common MCU peripherals without glue logic or protocol translation |
| Low 10µA shutdown current | Enables µA-level average power in wake-sleep sensor nodes with 100ms+ idle intervals |
| 75ksps throughput with 8.5-cycle conversion | Supports deterministic timing in closed-loop control or streaming data loggers |
Applications
| Portable Data Logging | Remote Digital Signal Processing |
|---|---|
Use Scenario: Battery-powered environmental sensor node measuring temperature, humidity, and pressure over hours. IC Role / Device Role / Timing Role: Primary ADC digitizing conditioned analog sensor outputs at 1–10ksps, synchronized to MCU sleep/wake cycles. Use Value: 10µA shutdown current extends battery life; 75ksps headroom allows oversampling for noise reduction. | Use Scenario: Wireless vibration monitor mounted on rotating machinery, transmitting FFT-processed spectral data via LoRaWAN. IC Role / Device Role / Timing Role: High-fidelity front-end ADC capturing time-domain waveforms before on-device FFT computation. Use Value: 70dB SINAD ensures clean spectral bins; 4.5MHz input bandwidth preserves transient impact signatures. |
| Isolated Data Acquisition | High-Accuracy Process Control |
Use Scenario: Industrial PLC module with optocoupler-isolated analog inputs for 4–20mA loop monitoring. IC Role / Device Role / Timing Role: Isolated-side ADC converting field signals with galvanic separation between sensor and controller. Use Value: External reference support enables precise 4.096V reference sharing across multiple channels; 12-bit resolution meets <0.1% full-scale accuracy needs. | Use Scenario: Closed-loop temperature controller in semiconductor fabrication equipment requiring stable setpoint regulation. IC Role / Device Role / Timing Role: Feedback ADC in PID loop sampling thermocouple amplifier output at fixed 10kHz intervals. Use Value: 1.5µs track/hold acquisition ensures minimal settling error during rapid thermal transients; ±1 LSB INL maintains linearity across 0–100°C 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 |
|---|---|---|---|
| ADS7822U | 2.7–5.25V supply; built-in reference; 200ksps; SPI-only interface; 8-pin SOIC | Higher speed and integrated reference simplify BOM but increase supply sensitivity and reduce external reference flexibility | Select when system lacks stable external reference and requires faster sampling than 75ksps |
| AD7893BN-10 | +5V only; external reference; 100ksps; 3-wire serial; 8-pin PDIP; ±0.5 LSB INL | Nearly identical pinout and function but higher throughput and tighter DC accuracy; no shutdown mode | Select when shutdown current is non-critical and 100ksps throughput improves control loop responsiveness |
Compared with ADS7822U and AD7893BN-10, the MAX189CEPA uniquely balances external reference control, ultra-low shutdown current, and proven 75ksps performance in legacy 8-pin PDIP form-making it optimal for cost-sensitive, space-constrained, and battery-aware industrial designs where reference sourcing and power budgeting are primary constraints.
Availability
MAX189CEPA is available at Aetrix Electronics and suitable for portable data logging, remote digital signal processing, isolated data acquisition, and high-accuracy process control requiring stable component supply across extended production lifecycles.
Supply support for MAX189CEPA 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 12-bit digitization in battery-operated and isolated measurement systems-emphasizing ease of interface, minimal external components, and robust DC/AC performance.
FAQ
What reference voltage does the MAX189CEPA require?
The MAX189CEPA requires an external reference voltage applied to the REF pin, ranging from +2.5V to VDD (4.75–5.25V). Unlike the MAX187, it has no internal reference. For optimal accuracy, use a precision 4.096V source bypassed with a 0.1µF capacitor directly at the REF pin. The MAX189CEPA's specified 12-bit linearity and 70dB SINAD assume a stable, low-noise reference meeting these conditions.
Does the MAX189CEPA support SPI, QSPI, and MICROWIRE interfaces?
Yes, the MAX189CEPA's 3-wire serial interface is explicitly compatible with SPI, QSPI, and MICROWIRE standards per its datasheet. It uses CS (active-low), SCLK, and DOUT lines, outputs MSB-first with a leading end-of-conversion (EOC) bit, and requires no mode configuration-making it interoperable with standard MCU serial peripheral units configured for CPOL = 0 and CPHA = 0. The MAX189CEPA supports SCLK frequencies up to 5MHz.
What is the maximum analog input frequency the MAX189CEPA can accurately digitize?
The MAX189CEPA has a 4.5MHz small-signal bandwidth and 75ksps throughput rate, limiting its Nyquist frequency to 37.5kHz. Accurate digitization of sinusoidal inputs up to ~10kHz is confirmed by SINAD/THD test data. Higher-frequency signals may be undersampled, but require anti-alias filtering to prevent spectral folding. The MAX189CEPA's 1.5µs track/hold acquisition time supports clean sampling of fast transients within this bandwidth.
How does shutdown mode work on the MAX189CEPA?
Shutdown mode on the MAX189CEPA is activated by pulling the SHDN pin low, reducing supply current to ≤10µA. The device remains fully functional upon SHDN deassertion, with no wake-up delay beyond the 2µs tWAKE specified for the MAX187-but since the MAX189CEPA relies on an external reference, wake time depends on reference stabilization. In shutdown, the MAX189CEPA retains no state and requires a new CS falling edge to initiate conversion after wake-up.
What package and temperature grade is the MAX189CEPA?
The MAX189CEPA is an 8-pin plastic dual in-line package (PDIP) rated for commercial temperature operation from 0°C to +70°C. The "C" suffix denotes the commercial grade, and "EPA" confirms the PDIP packaging. This variant shares pinout and electrical specifications with the 16-pin wide SO version but offers through-hole mounting compatibility for prototyping and low-volume industrial assembly.
MAX189CEPA 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:
- External
- 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:
- -
MAX189CEPA FAQ
1.How can I place an order for MAX189CEPA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX189CEPA 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 MAX189CEPA reliable?
The price and inventory of MAX189CEPA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX189CEPA is usually 5 days.
3.What payment methods are accepted for MAX189CEPA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX189CEPA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX189CEPA?
MAX189CEPA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX189CEPA 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 MAX189CEPA?
For technical support, including MAX189CEPA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX189CEPA requirements.
6.How does Aetrix verify that MAX189CEPA is sourced from the original manufacturer or authorized distributors?
All MAX189CEPA 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 MAX189CEPA meets industry standards.
7.What is the process for return or replacement of MAX189CEPA?
All MAX189CEPA units undergo pre-shipment inspection (PSI). If there is an issue with MAX189CEPA, 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 MAX189CEPA part is unused and in its original packaging.
Return procedure for MAX189CEPA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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