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Analog Devices Inc./Maxim Integrated MAX189BCPA+
- Part No.:
- MAX189BCPA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX189BCPA+.pdf
- Description:
- IC ADC 12BIT SAR 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,057
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Product details
Overview
MAX189BCPA+ from Maxim Integrated is a 12-bit serial analog-to-digital converter (ADC) designed for low-power, single-supply +5V operation with external reference support. It delivers 75ksps throughput, ±½ LSB integral nonlinearity (A-grade), 4.5MHz small-signal bandwidth, and 70dB SINAD at 10kHz - enabling high-accuracy sensor digitization in space-constrained industrial data loggers.
For engineers reviewing the MAX189BCPA+ datasheet, MAX189BCPA+ pinout, MAX189BCPA+ application, or MAX189BCPA+ equivalent, this page provides verified package mapping (8-pin PDIP), confirmed 3-wire SPI/QSPI/MICROWIRE interface timing, real-world acquisition time (1.5µs), shutdown current (≤10µA), and validated alternative options for external-reference 12-bit ADC replacement.
Technical Context
The MAX189BCPA+ implements a successive-approximation register (SAR) architecture with integrated track/hold, requiring no external hold capacitor. Its conversion cycle is internally timed at 8.5 clock periods (tCONV), initiated by CS falling edge and signaled by DOUT high transition (EOC).
It operates exclusively with an external reference voltage applied to the REF pin (2.5V to VDD), supports unipolar 0–VREF input range, and uses a 3-wire serial interface (CS, SCLK, DOUT) compatible with SPI, QSPI, and MICROWIRE protocols - with data output MSB-first on SCLK falling edge and no external hardware required for microcontroller interfacing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete digital codes over full-scale range |
| Throughput Rate | 75ksps - supports real-time sampling of signals up to 37.5kHz (Nyquist-limited) |
| Integral Nonlinearity | ±½ LSB (MAX189A grade) - ensures monotonicity and <0.012% full-scale error after calibration |
| SINAD | 70dB at 10kHz - enables >11.3 effective bits for precision measurement applications |
| Supply Current | 1.0–2.0mA operating / ≤10µA shutdown - allows battery-powered operation with duty-cycled sampling |
| Reference Input Range | +2.5V to VDD (4.75–5.25V) - accepts stable external references like REF5040 or ADR444 |
| Small-Signal Bandwidth | 4.5MHz - supports accurate digitization of fast transients and undersampling applications |
Pinout & Package
MAX189BCPA+ is housed in an 8-pin plastic dual-inline package (PDIP), pin-compatible with industry-standard through-hole PCB layouts and socket-based prototyping. Thermal performance supports continuous operation at +70°C ambient (727mW max dissipation).
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VDD) | Positive supply rail | +5V ±5% main power input; bypass with 0.1µF ceramic near pin |
| 2 (AIN) | Analog input terminal | 0V to VREF unipolar sampling node; 16pF input capacitance requires low-Z drive |
| 3 (SHDN) | Three-level shutdown control | Pull low for ≤10µA shutdown; float or high for active mode (no internal reference activation) |
| 4 (REF) | External reference input | Accepts 2.5V–5.25V reference; 12–20kΩ input resistance; bypass with 0.1µF ceramic |
| 5 (GND) | Common analog/digital ground | Single-point AGND/DGND connection required for noise-sensitive measurements |
| 6 (DOUT) | Serial data output | 3-wire interface output; MSB-first, EOC = rising edge, transitions on SCLK falling edge |
| 7 (CS) | Active-low chip select | Falling edge initiates conversion; high impedance when deasserted; min pulse width 500ns |
| 8 (SCLK) | Serial clock input | Accepts 0–5MHz external clock; 50% duty cycle not required; min high/low time 100ns |
Key Features
| Feature | Design Value |
|---|---|
| 3-wire serial interface | Fully compatible with SPI, QSPI, and MICROWIRE - eliminates need for parallel bus or glue logic |
| Track/hold acquisition time | 1.5µs maximum - enables rapid successive conversions without settling delay penalties |
| Low-power shutdown mode | ≤10µA supply current - reduces average system power in intermittent-sampling applications |
| On-chip SAR conversion core | No external clock generator needed - internal timing frees MCU resources during conversion |
| Input protection diodes | Clamp AIN to GND −0.3V / VDD +0.3V - prevents damage from transient overvoltage |
Applications
| Portable Data Logging | Remote Digital Signal Processing |
|---|---|
Use Scenario: Battery-powered environmental sensor nodes logging temperature, pressure, and humidity over weeks. IC Role / Device Role / Timing Role: Primary ADC digitizing conditioned analog outputs from MEMS sensors at 1–10Hz rates. Use Value: 10µA shutdown current extends battery life; 12-bit resolution captures sub-0.1% changes in calibrated sensor spans. |
Use Scenario: Edge-processing modules in distributed industrial monitoring systems with isolated RS-485 backhaul. IC Role / Device Role / Timing Role: Local signal digitizer feeding FPGA or DSP for real-time FFT analysis before transmission. Use Value: 75ksps throughput and 4.5MHz bandwidth support undersampling of kHz-range vibration spectra. |
| Isolated Data Acquisition | High-Accuracy Process Control |
Use Scenario: 4–20mA loop-powered field instruments with galvanic isolation between sensor front-end and controller. IC Role / Device Role / Timing Role: Isolated-side ADC converting shunt-voltage signals into digital values for opto-coupled UART output. Use Value: Single +5V supply simplifies isolated DC-DC design; ±½ LSB INL ensures traceable calibration against NIST standards. |
Use Scenario: Closed-loop feedback controllers in chemical dosing systems requiring <0.02% full-scale repeatability. IC Role / Device Role / Timing Role: High-stability ADC measuring potentiometer or strain-gauge bridge outputs in PID loops. Use Value: External reference support allows use of ultra-low-drift references (e.g., REF5040) to minimize gain drift over temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit external-reference serial ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7816U | 8-pin SOIC; 100ksps; ±1 LSB INL; requires external reference; 2.7–5.25V supply | Higher speed but looser linearity; better suited for cost-sensitive, non-calibrated systems | Select when throughput >75ksps is mandatory and ±1 LSB INL is acceptable |
| AD7490BRUZ | 16-pin TSSOP; 1MSPS; ±1 LSB INL; SPI-only interface; 2.7–5.25V supply; internal reference optional | Higher speed and channel count (8-channel); less suitable for space-constrained PDIP layouts | Select when multi-channel sampling or faster update rates are required and board area permits TSSOP |
Compared with MAX189BCPA+, ADS7816U offers higher speed but relaxed linearity, while AD7490BRUZ adds multiplexing and speed at the cost of larger footprint and different pinout - neither is pin-compatible, but both serve overlapping external-reference 12-bit ADC use cases where layout flexibility or performance trade-offs exist.
Availability
MAX189BCPA+ is available at Aetrix Electronics and suitable for portable data logging, remote digital signal processing, and isolated data acquisition requiring stable component supply across extended product lifecycles.
Supply support for MAX189BCPA+ 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, single-supply 12-bit digitization in size- and energy-constrained systems - prioritizing ease of interface, minimal external components, and guaranteed AC performance at 75ksps.
FAQ
What reference voltage should be used with MAX189BCPA+?
The MAX189BCPA+ requires an external reference voltage applied to the REF pin within +2.5V to VDD (4.75–5.25V). For optimal accuracy, a precision 4.096V reference such as the REF5040 or ADR444 is recommended - ensuring 1 LSB = 1.00mV and supporting the device's ±½ LSB integral nonlinearity specification. The MAX189BCPA+ does not include an internal reference.
Does MAX189BCPA+ support SPI interface timing without modifications?
Yes, MAX189BCPA+ natively supports SPI protocol with CPOL = 0 and CPHA = 0 configuration. It outputs MSB-first on SCLK falling edge, uses CS falling edge to initiate conversion, and signals end-of-conversion via DOUT rising edge. No level-shifting or timing adaptation is needed for standard 3.3V or 5V microcontrollers implementing native SPI master mode.
What is the minimum acquisition time between successive conversions using MAX189BCPA+?
The minimum acquisition time (tACQ) for MAX189BCPA+ is 1.5µs, specified under CS = high condition. To guarantee full 12-bit accuracy, CS must remain high for ≥1.5µs before the next falling edge initiates a new conversion. This parameter is independent of source impedance due to the integrated track/hold circuitry.
Can MAX189BCPA+ operate from a 3.3V supply?
No, MAX189BCPA+ is specified only for +5V ±5% (4.75–5.25V) operation per its Absolute Maximum Ratings and Electrical Characteristics tables. Supply voltage below 4.75V may cause failure to meet timing, linearity, or reference regulation specifications - and is outside the qualified operating range documented for MAX189BCPA+.
How does shutdown mode affect wake-up time for MAX189BCPA+?
In shutdown mode, MAX189BCPA+ draws ≤10µA and wakes up instantly upon SHDN deassertion - unlike the MAX187, it does not rely on internal reference recharge. Since it uses an external reference, no wake-up delay is required before initiating the first conversion after exit from shutdown, enabling immediate sampling in burst-mode applications.
MAX189BCPA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Bulk
- 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:
- 8-PDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
MAX189BCPA+ FAQ
1.How can I place an order for MAX189BCPA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX189BCPA+ 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 MAX189BCPA+ reliable?
The price and inventory of MAX189BCPA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX189BCPA+ is usually 5 days.
3.What payment methods are accepted for MAX189BCPA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX189BCPA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX189BCPA+?
MAX189BCPA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX189BCPA+ 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 MAX189BCPA+?
For technical support, including MAX189BCPA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX189BCPA+ requirements.
6.How does Aetrix verify that MAX189BCPA+ is sourced from the original manufacturer or authorized distributors?
All MAX189BCPA+ 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 MAX189BCPA+ meets industry standards.
7.What is the process for return or replacement of MAX189BCPA+?
All MAX189BCPA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX189BCPA+, 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 MAX189BCPA+ part is unused and in its original packaging.
Return procedure for MAX189BCPA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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