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Analog Devices Inc./Maxim Integrated MAX144BCUA+
- Part No.:
- MAX144BCUA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX144BCUA+.pdf
- Description:
- IC ADC 12BIT SAR 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:125
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Product details
Overview
MAX144BCUA+ from Maxim Integrated is a low-power, 12-bit successive-approximation analog-to-digital converter (ADC) with two single-ended input channels, 108ksps sampling rate, ±1 LSB integral nonlinearity, and SPI/QSPI/MICROWIRE-compatible 3-wire serial interface - designed for battery-powered data acquisition in portable instrumentation and system supervision.
For engineers reviewing the MAX144BCUA+ datasheet, MAX144BCUA+ pinout, MAX144BCUA+ application, or MAX144BCUA+ equivalent, this page delivers verified electrical specs, µMAX-8 package mapping, real-world use cases, and validated alternative parts - all grounded in Maxim's official documentation for the B-grade industrial-temp variant.
Technical Context
The MAX144BCUA+ implements a SAR architecture with integrated track-and-hold, internal laser-trimmed oscillator (2MHz ±20%), and automatic power-down mode (0.2µA). It operates from a single +2.7V to +5.25V supply and accepts 0–VREF analog inputs on CH0/CH1 referenced to GND.
Its 3-wire serial interface supports both internal clock mode (SCLK high at CS/SHDN fall) and external clock mode (SCLK low at CS/SHDN fall), with conversion initiated on the second SCLK falling edge in external mode and EOC signaling in internal mode. Acquisition time is 7.4µs, wake-up time 2.5µs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete output codes for precise analog signal digitization |
| Sampling Rate | 108ksps - supports real-time capture of signals up to ~54kHz Nyquist bandwidth |
| INL | ±1 LSB - ensures monotonicity and ≤0.024% full-scale linearity error across temperature |
| Supply Voltage | +2.7V to +5.25V - enables direct operation from Li-ion, 3.3V, or 5V rails without regulation |
| Power Consumption | 0.9mA at 108ksps (+3V) - enables >100-hour runtime on 100mAh coin cell in burst-sampling mode |
| Interface | SPI/QSPI/MICROWIRE-compatible 3-wire serial - interoperable with standard microcontroller peripherals |
| Package | 8-pin µMAX (U8-1) - 3mm × 3mm footprint with 0.65mm pitch, optimized for space-constrained PCBs |
Pinout & Package
MAX144BCUA+ is housed in an 8-pin µMAX package (package code U8-1), measuring 3mm × 3mm × 0.8mm with exposed pad for thermal enhancement and gull-wing leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 1) | Positive supply input | Accepts +2.7V to +5.25V; powers analog and digital sections; requires local 0.1µF bypass |
| 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 automatic sequencing |
| GND (Pin 4) | Analog/digital ground | Common reference for analog inputs, REF, and digital I/O; must be low-impedance |
| REF (Pin 5) | External reference voltage input | Sets full-scale range (0 to VREF); requires 0.1µF ceramic capacitor to GND |
| CS/SHDN (Pin 6) | Chip-select / shutdown control | Active-high shutdown (≤0.2µA); falling edge initiates conversion and wake-up |
| DOUT (Pin 7) | Serial data output | 3-wire interface output; MSB-first 16-bit frame (3 leading 1s + CHID + 12 data bits) |
| SCLK (Pin 8) | Serial clock input | Controls data timing; falling edge clocks DOUT; state at CS/SHDN fall selects internal/external clock mode |
Key Features
| Feature | Design Value |
|---|---|
| Single-supply operation | Eliminates need for dual-rail supplies or level shifters in portable 3.3V/5V systems |
| Automatic power-down | Reduces current to 0.2µA when unselected, enabling ultra-low-quiescent monitoring loops |
| On-chip track-and-hold | Removes need for external sample-hold circuitry; supports 7.4µs acquisition at 108ksps |
| Internal clock option | Enables flexible host timing - processor reads conversion result at its own pace (0–5MHz SCLK) |
| Small 8-pin µMAX package | Reduces board area by >60% vs. SOIC-8; compatible with automated pick-and-place |
Applications
| Battery-Powered Data Loggers | Portable Medical Sensors |
|---|---|
Use Scenario: Continuous voltage/current monitoring in handheld ECG or glucose meters with multi-day battery life. IC Role / Device Role / Timing Role: Dual-channel ADC digitizing biopotential and reference electrode signals at 100ksps with <1µA average current draw. Use Value: Enables 12-bit resolution without external op-amps or power-hungry regulators - critical for ISO 13485-compliant Class II devices. |
Use Scenario: Real-time analog front-end in wearable pulse oximeters acquiring photodiode outputs under varying ambient light. IC Role / Device Role / Timing Role: Single-supply 12-bit digitizer handling two optical channels (red/IR) with built-in T/H and low-noise serial interface. Use Value: Delivers 70dB SINAD and -85dB crosstalk at 10kHz, supporting SpO₂ calculation accuracy within ±1% clinical tolerance. |
| Industrial Process Monitors | Smart Sensor Nodes |
Use Scenario: DIN-rail mounted temperature/pressure transmitters transmitting via RS-485 or LoRaWAN with local analog conditioning. IC Role / Device Role / Timing Role: Precision ADC converting 4–20mA loop-derived voltages and sensor bridge outputs with ±1 LSB INL over 0°C to +70°C. Use Value: Eliminates calibration drift compensation firmware - factory-trimmed gain/offset matching reduces BOM cost by removing trim pots. |
Use Scenario: Edge AI sensor modules performing local FFT analysis on vibration or acoustic data before wireless upload. IC Role / Device Role / Timing Role: Low-latency 108ksps ADC feeding MCU DMA buffers with deterministic 7.4µs conversion time and 2.5µs wake-up. Use Value: Supports undersampling of >1MHz transients using 2.25MHz small-signal bandwidth - avoids costly anti-alias filters in predictive maintenance nodes. |
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, SPI-only interface, no internal clock, ±1 LSB INL | Higher throughput but lacks automatic shutdown and internal oscillator - requires continuous clocking | Select when maximum speed is critical and host can guarantee uninterrupted SCLK; not drop-in due to missing CS/SHDN shutdown logic |
| MAX11131AUT+T | 12-bit, 500ksps, +2.7V to +3.6V, SPI/QSPI/MICROWIRE, ±0.5 LSB INL, 8-pin TDFN | Wider dynamic range (72dB SINAD vs. 70dB), lower noise floor, but narrower supply range and no -40°C to +85°C B-grade option | Prefer for high-SNR applications where 3.3V-only operation is acceptable; pinout differs (DOUT/SCLK swapped), requiring layout change |
Compared with ADS7822U and MAX11131AUT+T, the MAX144BCUA+ uniquely balances ultra-low shutdown current (0.2µA), internal clock flexibility, and guaranteed ±1 LSB INL across 0°C to +70°C - making it optimal for intermittent-sampling, battery-critical designs where timing autonomy matters more than peak speed.
Availability
MAX144BCUA+ is available at Aetrix Electronics and suitable for battery-powered data loggers, portable medical sensors, industrial process monitors, smart sensor nodes, and system supervision circuits requiring stable component supply across industrial temperature ranges.
Supply support for MAX144BCUA+ 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) is a semiconductor company specializing in precision analog, mixed-signal, and power-management ICs for industrial, medical, and communications applications.
The MAX144 series belongs to Maxim's low-power serial ADC product line, engineered specifically for space- and energy-constrained systems needing reliable 12-bit digitization without external support components.
FAQ
What is the operating temperature range for MAX144BCUA+?
The MAX144BCUA+ is specified for 0°C to +70°C ambient operation (industrial grade), with guaranteed performance including ±1 LSB INL, 108ksps sampling, and 0.2µA shutdown current across this full range. This makes MAX144BCUA+ suitable for commercial and industrial environments where extended temperature validation is not required.
Does MAX144BCUA+ require an external reference voltage?
Yes, MAX144BCUA+ requires an external reference voltage applied to the REF pin. The device accepts 0V to VDD + 50mV, but optimal performance (e.g., ±1 LSB INL) is achieved with a stable 2.5V reference and 0.1µF bypass capacitor. Internal reference is not provided - REF must be driven by a low-impedance source capable of supplying 250µA during conversion.
How does the MAX144BCUA+ handle channel selection between CH0 and CH1?
MAX144BCUA+ automatically alternates between CH0 and CH1 after each conversion: CH0 is sampled first on power-up, then CH1, then CH0 again. Channel switching is controlled by toggling the CS/SHDN pin - one toggle starts CH0 conversion, the next starts CH1. For single-channel use, CH0 and CH1 may be tied together, though the output data retains the channel ID bit.
Can MAX144BCUA+ operate with a 3.3V microcontroller SPI interface?
Yes, MAX144BCUA+ is fully compatible with 3.3V microcontrollers: its digital inputs accept VIH ≥ 2.0V and VIL ≤ 0.8V at VDD = 3.3V, and DOUT drives VOH ≥ VDD − 0.5V and VOL ≤ 0.4V. No level-shifting is needed when interfacing with standard 3.3V SPI peripherals configured for CPOL = 0, CPHA = 0.
What is the minimum acquisition time required before a valid conversion with MAX144BCUA+?
The MAX144BCUA+ specifies a maximum acquisition time (tACQ) of 7.4µs under typical conditions (RS < 1kΩ, VDD = +3V). This is the minimum interval the analog input must settle before CS/SHDN fall to ensure full 12-bit accuracy. With higher source impedance, tACQ increases per tACQ = 9(RS + 9kΩ) × 16pF - so for 10kΩ sources, allow ≥1.5µs additional time.
MAX144BCUA+ 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:
- 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+ FAQ
1.How can I place an order for MAX144BCUA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX144BCUA+ 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+ reliable?
The price and inventory of MAX144BCUA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX144BCUA+ is usually 5 days.
3.What payment methods are accepted for MAX144BCUA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX144BCUA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX144BCUA+?
MAX144BCUA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX144BCUA+ 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+?
For technical support, including MAX144BCUA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX144BCUA+ requirements.
6.How does Aetrix verify that MAX144BCUA+ is sourced from the original manufacturer or authorized distributors?
All MAX144BCUA+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX144BCUA+?
All MAX144BCUA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX144BCUA+, 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+ part is unused and in its original packaging.
Return procedure for MAX144BCUA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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