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Analog Devices Inc./Maxim Integrated MAX144BEUA+T
- Part No.:
- MAX144BEUA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX144BEUA+T.pdf
- Description:
- IC ADC 12BIT SAR 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:1,110
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Product details
Overview
MAX144BEUA+T from Maxim Integrated is a -40°C to +85°C industrial-grade, 12-bit successive-approximation analog-to-digital converter (ADC) with two single-ended input channels, 108ksps sampling rate, ±1 LSB INL, and SPI/QSPI/MICROWIRE-compatible 3-wire serial interface - used in portable data loggers for precision sensor digitization under battery-constrained conditions.
For engineers reviewing the MAX144BEUA+T datasheet, MAX144BEUA+T pinout, MAX144BEUA+T application, or MAX144BEUA+T equivalent, this page delivers verified electrical specs, µMAX-8 package layout, real-world acquisition timing constraints, and validated drop-in alternatives for low-power, space-sensitive embedded measurement systems.
Technical Context
The MAX144BEUA+T implements a SAR architecture with integrated track-and-hold, supporting internal clock mode (2MHz oscillator, 0–5MHz SCLK readout) or external clock mode (100kHz–2.17MHz), where conversion starts on the second SCLK falling edge. Its analog front-end features 9kΩ input resistance and 16pF input capacitance, requiring ≤1kΩ source impedance for full AC performance.
It operates from a single +2.7V to +5.25V supply, draws 0.9mA at 108ksps (+3V), drops to 10µA at 1ksps, and enters 0.2µA shutdown when CS/SHDN = VDD. The REF pin accepts 0 to VDD + 50mV, demanding ≤10Ω source impedance and ≥250µA drive capability during conversion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 1 LSB = VREF/4096 quantization step for high-precision sensor signal digitization |
| Sampling Rate | 108ksps - supports Nyquist-limited bandwidth up to ~54kHz or undersampling of higher-frequency transients |
| INL | ±1 LSB - ensures monotonicity and <0.024% full-scale linearity error across -40°C to +85°C |
| Power Consumption | 0.9mA @ 108ksps, +3V - enables >100-hour operation on a 100mAh coin cell in continuous acquisition |
| Interface | SPI/QSPI/MICROWIRE-compatible 3-wire serial - interoperates with standard microcontroller peripherals without protocol translation |
| Acquisition Time | 2.5µs wake-up + 7.4µs conversion - total latency <10µs allows tight control-loop timing in system supervision |
| Input Configuration | 2-channel single-ended (CH0, CH1) - permits independent monitoring of dual sensors (e.g., temperature + voltage) with shared reference |
Pinout & Package
MAX144BEUA+T is housed in an 8-pin µMAX package (U8-1 code), 3mm × 3mm body, 0.5mm pitch, exposed pad for thermal enhancement. Pinout matches industry-standard 3-wire ADC layout for compact PCB routing and minimal trace length on sensitive analog inputs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 1) | Positive supply input | Accepts +2.7V to +5.25V; requires local 0.1µF ceramic bypass to GND for noise immunity |
| CH0 (Pin 2) | Analog input channel 0 | Single-ended input referenced to GND; must stay within GND – 50mV to VDD + 50mV for accuracy |
| CH1 (Pin 3) | Analog input channel 1 | Single-ended input referenced to GND; shares same voltage limits and protection diodes as CH0 |
| GND (Pin 4) | Analog/digital ground | Common return for analog inputs, reference, and digital I/O; must be star-connected to minimize noise coupling |
| REF (Pin 5) | External reference voltage | Defines full-scale range (0 to VREF); requires 0.1µF capacitor directly at pin for stability during conversion |
| CS/SHDN (Pin 6) | Chip-select / shutdown control | Active-high shutdown (≤0.2µA) or active-low enable; rising edge disables DOUT output within 120ns |
| DOUT (Pin 7) | Serial data output | 3-state, MSB-first, changes on SCLK falling edge; high-impedance when CS/SHDN = VDD |
| SCLK (Pin 8) | Serial clock input | Drives data transfer and (in external mode) conversion timing; 50% duty cycle required |
Key Features
| Feature | Design Value |
|---|---|
| Single-supply operation | +2.7V to +5.25V - eliminates need for negative rail or LDO sequencing in battery-powered designs |
| Automatic power-down | 0.2µA shutdown current - reduces average system power by >99.9% between conversions in intermittent logging |
| On-chip track-and-hold | 7.4µs conversion time with 2.5µs wake-up - enables precise sampling of fast-rising signals without external T/H circuitry |
| Small-footprint packaging | 8-pin µMAX (3mm × 3mm) - saves >60% board area vs. SOIC-8 while maintaining thermal performance |
| Robust analog input protection | Clamp diodes to VDD/GND with ±50mV operating window - prevents damage from ESD or overvoltage without external components |
Applications
| Portable Data Logging | Battery-Powered Systems |
|---|---|
Use Scenario: Compact environmental monitor recording temperature, humidity, and pressure every 10 seconds using coin-cell power. IC Role / Device Role / Timing Role: Dual-channel ADC digitizing two independent sensor outputs with shared VREF and automatic sleep/wake cycling. Use Value: 0.2µA shutdown current extends battery life to >5 years; 12-bit resolution captures sub-degree thermal drift and <0.1% RH variation. |
Use Scenario: Wireless sensor node powered by Li-SOCl₂ battery, transmitting data only upon threshold-triggered events. IC Role / Device Role / Timing Role: Low-latency ADC enabling rapid wake-from-sleep measurement (<10µs total latency) before RF transmission. Use Value: 2.5µs wake-up + 7.4µs conversion ensures measurement completes before radio startup, minimizing total active time. |
| Isolated Data Acquisition | System Supervision |
Use Scenario: Industrial PLC module measuring 4–20mA loop currents across opto-isolated barriers. IC Role / Device Role / Timing Role: Single-ended ADC accepting isolated analog inputs with internal reference rejection and low supply current. Use Value: ±1 LSB INL and 80dB SFDR ensure accurate current reconstruction despite common-mode noise on isolation barrier. |
Use Scenario: Embedded controller monitoring CPU core voltage, auxiliary rail voltages, and die temperature in real time. IC Role / Device Role / Timing Role: Multi-channel supervisor ADC scanning critical rails with channel auto-sequencing and no software overhead. Use Value: Hardware-controlled channel toggle via CS/SHDN eliminates firmware polling delay; 108ksps supports 10ms full-BOM scan. |
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, +2.7V to +5.5V, SPI-only interface, no internal T/H, 1.25mW @ 200ksps | Higher speed but lacks automatic shutdown (1.2µA standby) and µMAX footprint | Select for throughput-critical designs needing >108ksps; verify external T/H and reference design |
| MAX11100ETE+ | 12-bit, 1MSPS, +2.7V to +3.6V, SPI/QSPI/MICROWIRE, internal reference option, 1.8mW @ 1MSPS | Higher speed and integrated reference, but narrower supply range and larger 16-pin TQFN package | Select when internal VREF suffices and board space allows 4×4mm TQFN; not suitable for wide-VDD or ultra-low-power use |
Compared with ADS7822U and MAX11100ETE+, the MAX144BEUA+T offers superior energy efficiency per sample (3.2mW @ 108ksps vs. 1.25–1.8mW at higher rates), guaranteed µMAX-8 compatibility for legacy layouts, and hardware-managed channel sequencing - making it optimal for cost- and size-constrained industrial logging.
Availability
MAX144BEUA+T is available at Aetrix Electronics and suitable for portable data logging, battery-powered instrumentation, and isolated industrial sensing requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX144BEUA+T 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 demanding industrial, medical, and communications applications.
The MAX144BEUA+T belongs to Maxim's low-power serial ADC product line, engineered specifically for battery-operated measurement systems requiring high resolution, small size, and guaranteed performance from -40°C to +85°C.
FAQ
What is the operating temperature range of the MAX144BEUA+T?
The MAX144BEUA+T is rated for -40°C to +85°C industrial temperature operation, with full specification compliance including ±1 LSB INL, 108ksps sampling, and 0.2µA shutdown current across this range. This makes MAX144BEUA+T suitable for deployment in outdoor sensors, automotive cabin modules, and factory-floor equipment without derating.
Does the MAX144BEUA+T require an external reference voltage?
Yes, the MAX144BEUA+T requires an external reference voltage applied to the REF pin. It accepts 0 to VDD + 50mV, typically 2.5V, and demands ≥250µA drive capability and ≤10Ω source impedance during conversion. A 0.1µF ceramic capacitor must be placed directly at the REF pin for stability - MAX144BEUA+T does not include an internal reference.
How does channel selection work on the MAX144BEUA+T?
The MAX144BEUA+T automatically alternates between CH0 and CH1 after each conversion. Channel switching is controlled by toggling the CS/SHDN pin: one low pulse initiates CH0 conversion, the next initiates CH1, and so on. To read the same channel repeatedly, toggle CS/SHDN twice between conversions - MAX144BEUA+T embeds the channel ID bit in the serial output stream.
What are the power consumption modes of the MAX144BEUA+T?
The MAX144BEUA+T offers four defined power states: 0.9mA at 108ksps (+3V), 100µA at 10ksps, 10µA at 1ksps, and 0.2µA in shutdown (CS/SHDN = VDD). These levels are production-tested and guaranteed across -40°C to +85°C. No configuration register writes are needed - power scaling is fully automatic based on SCLK activity and CS/SHDN state.
Is the MAX144BEUA+T pin-compatible with other Maxim ADCs?
Yes, the MAX144BEUA+T shares identical pinout and µMAX-8 package (U8-1) with MAX144ACUA, MAX144BCUA, MAX144AEUA, and MAX145 variants. It is also functionally compatible with the 10-bit MAX157/MAX159 in the same package, though those require updated firmware for 10-bit data handling - MAX144BEUA+T retains full hardware compatibility for drop-in replacement in existing µMAX-8 footprints.
MAX144BEUA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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+T FAQ
1.How can I place an order for MAX144BEUA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX144BEUA+T 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+T reliable?
The price and inventory of MAX144BEUA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX144BEUA+T is usually 5 days.
3.What payment methods are accepted for MAX144BEUA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX144BEUA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX144BEUA+T?
MAX144BEUA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX144BEUA+T 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+T?
For technical support, including MAX144BEUA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX144BEUA+T requirements.
6.How does Aetrix verify that MAX144BEUA+T is sourced from the original manufacturer or authorized distributors?
All MAX144BEUA+T 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+T meets industry standards.
7.What is the process for return or replacement of MAX144BEUA+T?
All MAX144BEUA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX144BEUA+T, 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+T part is unused and in its original packaging.
Return procedure for MAX144BEUA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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