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Analog Devices Inc./Maxim Integrated MAX144BCUA+T
- Part No.:
- MAX144BCUA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX144BCUA+T.pdf
- Description:
- IC ADC 12BIT SAR 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:1,171
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Product details
Overview
MAX144BCUA+T from Maxim Integrated is a low-power, 12-bit successive-approximation ADC with 2-channel single-ended input, 108ksps sampling rate, ±1 LSB INL, and SPI/QSPI/MICROWIRE-compatible 3-wire serial interface - designed for battery-powered data acquisition in portable instrumentation and system supervision circuits.
For engineers reviewing the MAX144BCUA+T datasheet, MAX144BCUA+T pinout, MAX144BCUA+T application, or MAX144BCUA+T equivalent, this page delivers verified electrical specs, µMAX-8 package mapping, real-world timing behavior (7.4µs conversion, 2.5µs wake-up), and validated alternative options for space-constrained, low-quiescent-current analog front-ends.
Technical Context
The MAX144BCUA+T implements a SAR architecture with integrated track-and-hold, supporting internal (laser-trimmed ~2MHz) or external clock modes (100kHz–2.17MHz). Its analog input structure accepts two single-ended channels (CH0/CH1) referenced to GND, with automatic channel alternation triggered by CS/SHDN toggling.
It features a 16pF input capacitance, 9kΩ input resistance, and 2.25MHz small-signal bandwidth - enabling undersampling of high-frequency transients when paired with anti-alias filtering. Power management includes automatic shutdown (0.2µA) and fast wake-up (2.5µs), synchronized to CS/SHDN state transitions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 1 LSB = VREF/4096 quantization step; supports precise measurement of sub-mV signals with 2.5V reference. |
| Sampling Rate | 108ksps - enables real-time capture of signals up to ~50kHz Nyquist bandwidth; sufficient for vibration monitoring and sensor polling. |
| INL | ±1 LSB - ensures monotonicity and <0.025% full-scale linearity error across temperature; critical for closed-loop control accuracy. |
| Supply Voltage | +2.7V to +5.25V - operates directly from single Li-ion cell (3.0–3.7V) or 3.3V/5V rails without LDO overhead. |
| Power Consumption | 0.9mA at 108ksps (+3V) - draws only 2.7mW active power; reduces thermal load in sealed enclosures. |
| Shutdown Current | 0.2µA - extends battery life in sleep-mode intervals; allows >1-year operation on CR2032 in intermittent logging. |
| Conversion Time | 7.4µs - defines minimum inter-sample interval; supports deterministic timing in time-critical firmware loops. |
Pinout & Package
MAX144BCUA+T is housed in an 8-pin µMAX package (U8-1), measuring 3mm × 3mm × 0.8mm with exposed pad for thermal enhancement - compatible with standard 0.65mm pitch PCB assembly and reflow profiles.
| 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 during conversion. |
| CH0 (Pin 2) | Analog input channel 0 | Single-ended input referenced to GND; sampled first after power-on reset; supports 0–VREF range. |
| CH1 (Pin 3) | Analog input channel 1 | Single-ended input referenced to GND; alternates with CH0; shares same VREF and acquisition timing. |
| GND (Pin 4) | Analog and digital ground | Common return for analog inputs, reference, and digital I/O; must be low-impedance star point to minimize noise coupling. |
| REF (Pin 5) | External reference voltage input | Sets full-scale range (0 to VREF); requires ≥18kΩ DC source impedance and ≤10Ω AC output impedance; bypass with 0.1µF. |
| CS/SHDN (Pin 6) | Chip-select / shutdown control | Active-high shutdown (≤5µA); falling edge initiates wake-up and conversion start; determines internal/external clock mode via SCLK level. |
| 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; supports 0–5MHz (internal) or 100kHz–2.17MHz (external) frequencies. |
Key Features
| Feature | Design Value |
|---|---|
| Single-supply operation | Eliminates dual-rail generation; simplifies power design for portable systems using 3.3V or single-cell batteries. |
| Automatic power-down | Reduces current to 0.2µA without external control logic - ideal for duty-cycled sensor nodes with microsecond wake-up latency. |
| On-chip track-and-hold | Removes need for external T/H amplifier; supports 2.25MHz small-signal bandwidth with 16pF input capacitance. |
| SPI/QSPI/MICROWIRE compatibility | Direct interface to common MCU peripherals (e.g., STM32 SPI, PIC SSP) without protocol translation or glue logic. |
| 8-pin µMAX package | 3×3mm footprint saves >60% board area vs. SOIC-8; enables high-density analog front-end integration in wearables and IoT edge nodes. |
Applications
| Battery-Powered Data Loggers | Portable Medical Sensors |
|---|---|
Use Scenario: Continuous temperature and ECG signal acquisition in handheld diagnostic tools powered by coin-cell batteries. IC Role / Device Role / Timing Role: 12-bit ADC digitizing dual analog sensor outputs with 108ksps throughput and 2.5µs wake-up to minimize active time per sample. Use Value: Enables >6-month battery life via 0.2µA shutdown current and deterministic low-power sequencing controlled by CS/SHDN. |
Use Scenario: Analog front-end for wearable pulse oximeters requiring simultaneous acquisition of red/IR photodiode currents. IC Role / Device Role / Timing Role: Dual-channel single-ended converter sampling CH0 (red) and CH1 (IR) with alternating channel auto-switching and shared REF. Use Value: Delivers ±1 LSB INL and 70dB SINAD at 10kHz - sufficient for SpO₂ calculation accuracy under motion artifact conditions. |
| Industrial Process Monitors | System Supervision Units |
Use Scenario: Remote RTD and thermocouple monitoring in factory automation nodes with 4–20mA loop power constraints. IC Role / Device Role / Timing Role: Low-noise ADC interfacing to precision op-amp signal conditioning stages; operates from 3.3V rail with minimal supply current. Use Value: 0.9mA active current at 108ksps avoids thermal drift in enclosed enclosures; 2.7V min supply supports brown-out resilience. |
Use Scenario: Voltage/current monitoring in server PSUs and telecom power modules where space and quiescent power are critical. IC Role / Device Role / Timing Role: High-speed ADC capturing rail voltages (12V, 3.3V, 1.8V) and sense resistor drops for real-time margining and fault detection. Use Value: 7.4µs conversion time enables sub-10µs response to overvoltage events; SPI interface allows tight MCU synchronization. |
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 |
|---|---|---|---|
| MAX144ACUA+ | ±0.5 LSB INL (vs. ±1 LSB), same package and pinout | Better linearity required for metrology-grade calibration; higher cost and lower availability | Select MAX144ACUA+ only if system-level INL budget demands <0.5 LSB error across temperature. |
| ADS7822U | 12-bit, 200ksps, SPI-only, 2.7–5.25V supply, ±1 LSB INL, MSOP-8 package | Higher speed but no automatic shutdown; lacks µMAX thermal performance and wake-up timing guarantee | Choose ADS7822U when throughput >108ksps is mandatory and shutdown current <1µA is not required. |
Compared with MAX144ACUA+, MAX144BCUA+ trades 0.5 LSB linearity for broader production tolerance and better cost-performance balance; compared with ADS7822U, it offers guaranteed 2.5µs wake-up and integrated power-down control - critical for ultra-low-duty-cycle battery systems.
Availability
MAX144BCUA+T is available at Aetrix Electronics and suitable for battery-powered data loggers, portable medical sensors, industrial process monitors, system supervision units, and isolated data acquisition requiring stable component supply across extended product lifecycles.
Supply support for MAX144BCUA+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 - emphasizing integration, reliability, and low-power innovation.
The MAX144 series belongs to Maxim's low-power serial ADC product line, engineered specifically for space- and energy-constrained systems needing high-resolution digitization without external T/H or reference buffers.
FAQ
What is the maximum sampling rate of the MAX144BCUA+T?
The MAX144BCUA+T achieves a maximum sampling rate of 108ksps under specified conditions (VDD = +2.7V to +5.25V, fSCLK = 2.17MHz, 16 clocks/conversion). This rate is sustained continuously in external clock mode and defines the upper limit for deterministic data capture in time-critical applications like vibration analysis or sensor fusion.
Does the MAX144BCUA+T require an external reference voltage?
Yes, the MAX144BCUA+T requires an external reference voltage applied to the REF pin. It does not include an internal reference. The reference must deliver ≥250µA DC load current with ≤10Ω output impedance and be bypassed with a 0.1µF capacitor; typical use cases employ precision references such as the MAX6126 or REF5025.
How does the MAX144BCUA+T enter and exit shutdown mode?
The MAX144BCUA+T enters shutdown automatically when CS/SHDN is driven high, reducing supply current to ≤0.2µA. It exits shutdown on the falling edge of CS/SHDN, with a guaranteed wake-up time of 2.5µs to full operation - provided the external reference is stable within 1 LSB. No additional control signals or timing sequences are required.
Is the MAX144BCUA+T pin-compatible with other devices in the MAX144 family?
Yes, the MAX144BCUA+T shares identical pinout and package (8-pin µMAX, U8-1) with all MAX144 variants including MAX144ACUA+, MAX144AEUA+, and MAX144BEUA+. This allows direct substitution within the same temperature grade (0°C to +70°C) without PCB modification, though INL and offset specifications differ between 'A' and 'B' grades.
What serial interface standards does the MAX144BCUA+T support?
The MAX144BCUA+T supports SPI, QSPI, and MICROWIRE protocols natively. It operates with CPOL = 0 and CPHA = 0, outputs data on the SCLK falling edge, and accepts clock frequencies from 0–5MHz (internal mode) or 100kHz–2.17MHz (external mode), ensuring seamless integration with most modern microcontrollers' hardware serial peripherals.
MAX144BCUA+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:
- 0°C ~ 70°C
- Supplier Device Package:
- 8-uMAX/uSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX144BCUA+T FAQ
1.How can I place an order for MAX144BCUA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX144BCUA+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 MAX144BCUA+T reliable?
The price and inventory of MAX144BCUA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX144BCUA+T is usually 5 days.
3.What payment methods are accepted for MAX144BCUA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX144BCUA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX144BCUA+T?
MAX144BCUA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX144BCUA+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 MAX144BCUA+T?
For technical support, including MAX144BCUA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX144BCUA+T requirements.
6.How does Aetrix verify that MAX144BCUA+T is sourced from the original manufacturer or authorized distributors?
All MAX144BCUA+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 MAX144BCUA+T meets industry standards.
7.What is the process for return or replacement of MAX144BCUA+T?
All MAX144BCUA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX144BCUA+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 MAX144BCUA+T part is unused and in its original packaging.
Return procedure for MAX144BCUA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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