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Analog Devices Inc./Maxim Integrated MAX144AEUA+T
- Part No.:
- MAX144AEUA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX144AEUA+T.pdf
- Description:
- IC ADC 12BIT SAR 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:3,910
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Product details
Overview
MAX144AEUA+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, ±0.5 LSB INL, and SPI/QSPI/MICROWIRE-compatible 3-wire serial interface - used in portable data loggers for precision voltage monitoring under battery-constrained conditions.
For engineers reviewing the MAX144AEUA+T datasheet, MAX144AEUA+T pinout, MAX144AEUA+T application, or MAX144AEUA+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 sensing systems.
Technical Context
The MAX144AEUA+T implements a SAR architecture with integrated track-and-hold, internal laser-trimmed oscillator (2MHz ±20%), and automatic power-down mode enabling 0.2µA shutdown current. Its analog front-end supports 0–VREF single-ended inputs with 9kΩ input resistance and 16pF input capacitance.
Conversion is initiated by CS/SHDN falling edge, with clock mode selected by SCLK state: internal clock (SCLK high) enables flexible readout at 0–5MHz SCLK; external clock (SCLK low) drives conversion at 100kHz–2.17MHz with 7.4µs conversion time and 2.5µs wake-up.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 1 LSB = VREF/4096 quantization step for precise voltage digitization |
| Sampling Rate | 108ksps - supports real-time capture of signals up to 1MHz small-signal bandwidth |
| INL | ±0.5 LSB - ensures monotonicity and <0.012% full-scale linearity error across temperature |
| Supply Range | +2.7V to +5.25V - operates directly from single Li-ion or 3.3V/5V system rails without LDO |
| Power (108ksps) | 0.9mA @ +3V - draws only 2.7mW, enabling >1-year battery life in 10ksps logging mode |
| Shutdown Current | 0.2µA - reduces quiescent draw by 4500× during idle intervals |
| Interface | SPI/QSPI/MICROWIRE 3-wire - interoperates with standard MCU serial peripherals without glue logic |
Pinout & Package
MAX144AEUA+T is housed in an 8-pin µMAX package (U8-1), 3mm × 3mm, 0.5mm pitch, exposed pad for thermal enhancement - compatible with automated SMT assembly 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/digital core and internal reference buffer |
| CH0 (Pin 2) | Analog input channel 0 | Single-ended input referenced to GND; sampled first after power-on reset |
| CH1 (Pin 3) | Analog input channel 1 | Single-ended input referenced to GND; alternates with CH0 in auto-sequencing mode |
| GND (Pin 4) | Analog and digital ground | Common return for analog inputs, reference, and digital I/O; requires low-impedance plane |
| REF (Pin 5) | External reference voltage input | Defines full-scale range (0 to VREF); requires 0.1µF bypass capacitor for noise rejection |
| CS/SHDN (Pin 6) | Chip-select / shutdown control | Active-high shutdown (≤5µA); falling edge initiates conversion and selects clock mode |
| DOUT (Pin 7) | Serial data output | 3-wire SPI-compatible output; high-impedance when CS/SHDN = high; data valid on SCLK falling edge |
| SCLK (Pin 8) | Serial clock input | Drives data shift-out and (in external mode) conversion timing; 100kHz–2.17MHz range |
Key Features
| Feature | Design Value |
|---|---|
| Single-supply operation | Eliminates dual-rail design complexity and reduces BOM count in portable instrumentation |
| Automatic power-down | Reduces average current to sub-µA between conversions without firmware intervention |
| On-chip track-and-hold | Enables accurate sampling of fast transients up to 2.25MHz without external T/H circuitry |
| Fast wake-up (2.5µs) | Allows rapid response to event-triggered sampling while maintaining ultra-low duty-cycle power |
| 8-pin µMAX package | Reduces board area by >60% vs. SOIC-8, critical for handheld medical and sensor modules |
Applications
| Battery-Powered Data Loggers | Isolated Industrial Sensors |
|---|---|
Use Scenario: Continuous voltage/current monitoring in remote environmental sensors powered by coin-cell or Li-SOCl₂ batteries. IC Role / Device Role / Timing Role: Primary ADC digitizing thermistor, RTD, or shunt-based analog signals at 1–10ksps with automatic sleep/wake cycles. Use Value: 0.2µA shutdown current extends battery life beyond 5 years; 12-bit resolution captures <1mV changes in 3.3V full-scale range. |
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: Isolated-side ADC converting 4–20mA loop-derived voltages before opto-coupled SPI transmission. Use Value: Single +3.3V supply simplifies isolated DC-DC design; ±0.5 LSB INL maintains <0.012% measurement accuracy across -40°C to +85°C. |
| Portable Medical Instruments | System Supervision Circuits |
Use Scenario: Vital sign monitors (e.g., pulse oximeter front-end) requiring low-noise, low-power analog acquisition in handheld enclosures. IC Role / Device Role / Timing Role: Dual-channel ADC sampling photodiode current and ambient light sensor simultaneously for ratiometric correction. Use Value: Channel-to-channel offset matching (±0.05 LSB) ensures consistent gain tracking; 70dB SINAD supports clean SpO₂ calculation. |
Use Scenario: Real-time monitoring of rail voltages (1.2V, 3.3V, 5V, 12V), temperature, and fan tach signals in network switch or server power management units. IC Role / Device Role / Timing Role: Dedicated supervision ADC interfacing to microcontroller via shared SPI bus with minimal GPIO usage. Use Value: SPI compatibility allows reuse of existing MCU peripheral; 108ksps burst mode captures transient brownouts missed by slower supervisors. |
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 +5.25V, but uses SPI-only interface (no QSPI/MICROWIRE) and lacks internal T/H; requires external sample clock | Higher throughput but demands additional timing control logic; less suitable for ultra-low-power wake-on-event use cases | Select when maximum speed >108ksps is required and system can manage external sampling timing |
| MAX11100ETE+ | 12-bit, 1MSPS, internal reference, 10-pin TDFN, but consumes 2.5mA active current and has no shutdown mode below 1µA | Superior speed and integration, yet incompatible with multi-year battery operation due to higher quiescent draw | Select for mains-powered test equipment where speed outweighs power efficiency |
Compared with ADS7822U and MAX11100ETE+, the MAX144AEUA+T uniquely balances 108ksps throughput, ±0.5 LSB linearity, 0.2µA shutdown, and µMAX-8 footprint - making it the optimal choice for compact, long-life, dual-channel sensing where SPI flexibility and minimal external components are mandatory.
Availability
MAX144AEUA+T 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 MAX144AEUA+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 MAX144 family targets low-power, space-constrained data acquisition systems - delivering high-resolution ADC performance with minimal external components and robust operation from -40°C to +85°C.
FAQ
What is the operating temperature range of the MAX144AEUA+T?
The MAX144AEUA+T is rated for industrial operation from -40°C to +85°C, as confirmed by its "E" grade suffix and ordering table specification. This range is validated across all key parameters including INL (±0.5 LSB), supply current, and conversion time - ensuring reliable performance in outdoor sensors, factory-floor controllers, and automotive cabin modules without derating.
Does the MAX144AEUA+T require an external reference voltage?
Yes, the MAX144AEUA+T requires an external reference voltage applied to the REF pin. It does not include an internal reference. The device accepts 0V to VDD + 50mV at REF, with recommended 2.5V reference and 0.1µF ceramic bypass capacitor placed close to the pin to maintain 12-bit accuracy and minimize noise-induced ENOB loss.
How does the MAX144AEUA+T handle channel selection between CH0 and CH1?
The MAX144AEUA+T automatically alternates between CH0 and CH1 on successive conversions after power-on reset. Channel selection is controlled by toggling the CS/SHDN pin: one toggle starts CH0 conversion, the next starts CH1, and so on. To convert the same channel repeatedly, toggle CS/SHDN twice between conversions - no register writes or command sequences are needed.
What is the minimum acquisition time required for accurate sampling with the MAX144AEUA+T?
The MAX144AEUA+T specifies a maximum acquisition time (tACQ) of 7µs under typical conditions (RS < 1kΩ). This value is derived from tACQ = 9(RS + RIN)CIN, where RIN = 9kΩ and CIN = 16pF. For source impedances above 1kΩ, external 0.01µF capacitors per channel are recommended to maintain full 12-bit accuracy without extending inter-conversion delay.
Can the MAX144AEUA+T be used with a microcontroller's hardware SPI peripheral?
Yes, the MAX144AEUA+T is fully compatible with standard hardware SPI peripherals when configured with CPOL = 0 and CPHA = 0. It outputs 16-bit frames (three leading 1s, CHID, then 12-bit MSB-first data) on DOUT, synchronized to SCLK falling edges - matching SPI Mode 0 timing and eliminating need for bit-banging or custom drivers.
MAX144AEUA+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:
- -
MAX144AEUA+T FAQ
1.How can I place an order for MAX144AEUA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX144AEUA+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 MAX144AEUA+T reliable?
The price and inventory of MAX144AEUA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX144AEUA+T is usually 5 days.
3.What payment methods are accepted for MAX144AEUA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX144AEUA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX144AEUA+T?
MAX144AEUA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX144AEUA+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 MAX144AEUA+T?
For technical support, including MAX144AEUA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX144AEUA+T requirements.
6.How does Aetrix verify that MAX144AEUA+T is sourced from the original manufacturer or authorized distributors?
All MAX144AEUA+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 MAX144AEUA+T meets industry standards.
7.What is the process for return or replacement of MAX144AEUA+T?
All MAX144AEUA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX144AEUA+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 MAX144AEUA+T part is unused and in its original packaging.
Return procedure for MAX144AEUA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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