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Analog Devices Inc./Maxim Integrated MAX144BEUA
- Part No.:
- MAX144BEUA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX144BEUA.pdf
- Description:
- IC ADC 12BIT SAR 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:4,603
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Product details
Overview
MAX144BEUA from Maxim Integrated is a -40°C to +85°C, 12-bit, 2-channel, single-ended successive-approximation analog-to-digital converter (ADC) with SPI/QSPI/MICROWIRE-compatible 3-wire serial interface, 108ksps sampling rate, and 8-pin µMAX package. It operates from +2.7V to +5.25V, consumes 0.9mA at full rate, and features internal track/hold, automatic power-down (0.2µA), and 2.5µs wake-up - ideal for portable data logging and battery-powered instrumentation.
For engineers reviewing the MAX144BEUA datasheet, MAX144BEUA pinout, MAX144BEUA application, or MAX144BEUA equivalent, this page delivers verified technical context, exact pin functions, real-world use cases in isolated acquisition and system supervision, and validated alternative parts with documented functional and application-level differences.
Technical Context
The MAX144BEUA implements a SAR architecture with integrated track-and-hold, accepting two single-ended analog inputs (CH0, CH1) referenced to GND, and alternates conversion between channels upon CS/SHDN toggling. Its internal clock supports 0–5MHz SCLK for flexible microprocessor interfacing, while external clock mode enables precise timing control at 100kHz–2.17MHz.
Conversion begins on CS/SHDN falling edge; acquisition time is 7.4µs, with 2.5µs wake-up from shutdown. Input structure includes 9kΩ input resistance and 16pF capacitance, requiring ≤1kΩ source impedance for full AC performance - anti-aliasing filtering is recommended for undersampling applications up to 2.25MHz small-signal bandwidth.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 1 LSB = VREF/4096 quantization step, enabling high-precision measurement of low-amplitude sensor signals. |
| Sampling Rate | 108ksps - supports real-time capture of transients up to ~50kHz Nyquist frequency without aliasing when properly filtered. |
| INL (Integral Nonlinearity) | ±1 LSB - ensures monotonicity and <0.024% full-scale error across temperature, critical for calibration-sensitive instrumentation. |
| Supply Current (108ksps) | 0.9mA at +3V - enables >100-hour operation on a 100mAh coin cell in continuous acquisition mode. |
| Power-Down Current | 0.2µA - reduces average system power by >99.9% during idle intervals, extending battery life in duty-cycled systems. |
| Operating Temperature | -40°C to +85°C - qualified for industrial and automotive under-hood environments without derating. |
| Serial Interface | SPI/QSPI/MICROWIRE-compatible 3-wire - interoperates with standard MCU peripherals without protocol translation or glue logic. |
Pinout & Package
MAX144BEUA is housed in an 8-pin µMAX package (U8-1), measuring 3mm × 3mm × 0.8mm, with exposed pad for thermal enhancement and space-constrained PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 1) | Positive supply input | Accepts +2.7V to +5.25V; powers analog core, digital logic, and internal reference buffer - requires local 0.1µF decoupling. |
| CH0 (Pin 2) | Analog input channel 0 | Single-ended input referenced to GND; sampled first after power-on reset; supports 0 to VREF range. |
| CH1 (Pin 3) | Analog input channel 1 | Single-ended input referenced to GND; alternates with CH0; shares same input structure and accuracy specs as CH0. |
| GND (Pin 4) | Analog and digital ground | Common return for all analog signals, reference, and digital I/O - must be low-impedance and separated from noisy digital planes. |
| REF (Pin 5) | External reference voltage input | Defines full-scale range (0 to VREF); requires ≥18kΩ DC input resistance and ≤10Ω source impedance; bypass with 0.1µF capacitor. |
| CS/SHDN (Pin 6) | Chip-select / shutdown control | Active-high shutdown: pulls high to enter 0.2µA sleep; active-low chip select: falling edge initiates conversion and wake-up. |
| DOUT (Pin 7) | Serial data output | 3-wire SPI-compatible output; data valid on SCLK falling edge; high-impedance when CS/SHDN = high. |
| SCLK (Pin 8) | Serial clock input | Drives data transfer and (in external mode) conversion timing; rising edge clocks data into host; falling edge updates DOUT. |
Key Features
| Feature | Design Value |
|---|---|
| Single-supply operation | +2.7V to +5.25V - eliminates need for dual-rail supplies in portable systems, simplifying power architecture and reducing BOM count. |
| Automatic power-down | 0.2µA shutdown current - enables ultra-low-power sleep states without external enable circuitry or firmware overhead. |
| Internal track/hold | 7.4µs conversion time with built-in T/H - removes requirement for external sample-hold amplifier, saving board area and signal-chain complexity. |
| 3-wire serial interface | SPI/QSPI/MICROWIRE compatibility - allows direct connection to industry-standard MCU serial peripherals without level-shifting or protocol adaptation. |
| Space-saving µMAX package | 8-pin, 3mm × 3mm footprint - fits in tight spaces typical of handheld medical devices and compact sensor nodes. |
Applications
| Battery-Powered Data Loggers | Isolated Industrial Sensors |
|---|---|
Use Scenario: Continuous voltage/current monitoring in remote environmental sensors powered by lithium-thionyl chloride cells. IC Role / Device Role / Timing Role: ADC digitizes two analog sensor outputs (e.g., temperature and humidity) with 12-bit precision and 108ksps throughput, synchronized via CS/SHDN-triggered conversions. Use Value: 0.9mA active current and 0.2µA shutdown extend battery life to >5 years in 1-second sampling interval deployments. |
Use Scenario: Signal conditioning in DIN-rail-mounted process transmitters with galvanic isolation between field-side analog inputs and controller-side digital bus. IC Role / Device Role / Timing Role: Front-end ADC acquires isolated analog inputs before transmission over RS-485; internal T/H and 2.5µs wake-up support fast response to alarm events. Use Value: ±1 LSB INL and 2.25MHz small-signal bandwidth ensure accurate representation of fast transients across isolation barriers without external amplification. |
| Portable Medical Instruments | System Supervision Circuits |
Use Scenario: Vital sign acquisition in handheld ECG or pulse oximetry units where size, power, and noise immunity are critical. IC Role / Device Role / Timing Role: Digitizes differential biopotential signals (after front-end instrumentation amp) using CH0/CH1 for dual-lead capture; SPI interface streams data to ARM Cortex-M host. Use Value: Low 3.2mW power at 3.6V and 108ksps enables continuous operation within strict thermal limits of handheld enclosures. |
Use Scenario: Real-time monitoring of rail voltages, temperatures, and fan speeds in telecom base station power modules. IC Role / Device Role / Timing Role: ADC samples multiple supply rails and thermal sensors via multiplexed single-ended inputs; automatic channel switching reduces firmware polling overhead. Use Value: -40°C to +85°C rating and ±0.15mV PSR guarantee stable readings across wide ambient and load conditions without recalibration. |
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 | 12-bit, 200ksps, SPI-only interface, no internal T/H, requires external reference buffer; 0.65mW at 200ksps. | Higher speed but lacks auto-channel switching and integrated T/H - demands more external components and layout care for AC performance. | Select when maximum throughput >108ksps is required and board space allows external signal conditioning. |
| MAX11131AUT+T | 12-bit, 1MSPS, internal reference, 10-pin µDFN, 1.25mW at 1MSPS; supports unipolar/bipolar inputs. | Higher speed and integrated reference simplify design but consume 3× more power at full rate and require different PCB footprint. | Select for high-speed embedded control loops where reference stability and layout simplicity outweigh power budget constraints. |
Compared with ADS7822U and MAX11131AUT+T, the MAX144BEUA offers optimal balance of ultra-low power (0.2µA shutdown), integrated T/H, automatic dual-channel sequencing, and proven µMAX reliability in extended-temperature industrial deployments - making it preferred for long-life, space-constrained, battery-operated systems.
Availability
MAX144BEUA is available at Aetrix Electronics and suitable for battery-powered data loggers, isolated industrial sensors, portable medical instruments, system supervision circuits, and process-control monitoring requiring stable component supply across extended temperature ranges.
Supply support for MAX144BEUA 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 - emphasizing integration, reliability, and low-power operation.
The MAX144BEUA belongs to Maxim's low-power serial ADC product line, engineered specifically for space- and energy-constrained systems requiring high-resolution digitization without external T/H or complex interface logic.
FAQ
What is the operating temperature range of the MAX144BEUA?
The MAX144BEUA is specified for -40°C to +85°C operation, meeting industrial-grade requirements. This range is confirmed in the Ordering Information table and Electrical Characteristics section, where parameters like INL (±1 LSB), supply current, and shutdown current are guaranteed across the full span - unlike the 'C' grade (0°C to +70°C) or 'M' grade (-55°C to +125°C) variants.
Does the MAX144BEUA include an internal reference?
No, the MAX144BEUA requires an external reference applied to the REF pin. The datasheet explicitly states "An external reference is required for both the MAX144 and the MAX145" and specifies REF input characteristics including minimum 18kΩ DC resistance and ≤10Ω source impedance. No internal reference voltage generator or buffer is integrated.
How does channel selection work on the MAX144BEUA?
The MAX144BEUA automatically alternates between CH0 and CH1 on successive conversions after power-on reset. Channel switching is controlled by toggling the CS/SHDN pin: one falling edge starts CH0 conversion, the next falling edge starts CH1, and so on. The channel ID bit (CHID) is included in the 16-bit serial output stream, allowing host firmware to identify which channel produced each sample.
What is the maximum sampling rate of the MAX144BEUA?
The MAX144BEUA achieves a maximum sampling rate of 108ksps, as confirmed in the General Description, Features list, and Electrical Characteristics tables. This rate assumes external clock mode with fSCLK = 2.17MHz and 16 clock cycles per conversion cycle. At this rate, total conversion time is 7.4µs, and wake-up from shutdown adds only 2.5µs latency.
Is the MAX144BEUA pin-compatible with the MAX145 series?
No - the MAX144BEUA and MAX145 share the same 8-pin µMAX package and pinout, but their analog input structures differ fundamentally: MAX144BEUA supports two single-ended channels (CH0, CH1), while MAX145 accepts pseudo-differential inputs (CH+, CH-). Pin-for-pin compatibility exists physically, but functional replacement requires redesign of input signal routing and firmware handling of channel data.
MAX144BEUA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 108k
- Number of Inputs:
- 2
- Input Type:
- Single Ended
- Data Interface:
- SPI
- Configuration:
- MUX-S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External
- Voltage - Supply, Analog:
- 2.7V ~ 5.25V
- Voltage - Supply, Digital:
- 2.7V ~ 5.25V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 8-uMAX/uSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX144BEUA FAQ
1.How can I place an order for MAX144BEUA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX144BEUA 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 MAX144BEUA reliable?
The price and inventory of MAX144BEUA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX144BEUA is usually 5 days.
3.What payment methods are accepted for MAX144BEUA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX144BEUA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX144BEUA?
MAX144BEUA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX144BEUA 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 MAX144BEUA?
For technical support, including MAX144BEUA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX144BEUA requirements.
6.How does Aetrix verify that MAX144BEUA is sourced from the original manufacturer or authorized distributors?
All MAX144BEUA 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 MAX144BEUA meets industry standards.
7.What is the process for return or replacement of MAX144BEUA?
All MAX144BEUA units undergo pre-shipment inspection (PSI). If there is an issue with MAX144BEUA, 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 MAX144BEUA part is unused and in its original packaging.
Return procedure for MAX144BEUA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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