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Analog Devices Inc./Maxim Integrated MAX144ACPA+
- Part No.:
- MAX144ACPA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX144ACPA+.pdf
- Description:
- IC ADC 12BIT SAR 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,193
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Product details
Overview
MAX144ACPA+ from Maxim Integrated is a low-power, 12-bit successive-approximation analog-to-digital converter (SAR ADC) with two single-ended input channels, 108ksps sampling rate, ±0.5 LSB INL, and operation from +2.7V to +5.25V supply - used in portable data loggers for precision sensor digitization under battery-constrained conditions.
For engineers reviewing the MAX144ACPA+ datasheet, MAX144ACPA+ pinout, MAX144ACPA+ application, or MAX144ACPA+ equivalent, key selection considerations include its 8-pin Plastic DIP package, SPI/QSPI/MICROWIRE-compatible 3-wire serial interface, automatic power-down mode (0.2µA), internal track/hold, and single-supply compatibility down to +2.7V.
Technical Context
The MAX144ACPA+ implements a SAR architecture with integrated track-and-hold, accepting 0–VREF single-ended inputs on CH0 and CH1. Conversion is initiated by CS/SHDN falling edge, with clock mode (internal or external) selected by SCLK state at that instant.
It supports both internal clock mode (2MHz oscillator, 0–5MHz SCLK for readout) and external clock mode (100kHz–2.17MHz), delivering 7.4µs conversion time and 2.5µs wake-up from shutdown. Dynamic performance includes 70dB SINAD, –85dB crosstalk, and 1MHz full-power bandwidth.
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 - enables real-time capture of signals up to ~50kHz via Nyquist-compliant sampling |
| INL | ±0.5 LSB - ensures monotonicity and <0.012% full-scale linearity error across temperature (0°C to +70°C) |
| Supply Voltage | +2.7V to +5.25V - allows direct interfacing with 3.3V or 5V microcontrollers without level-shifting |
| Power Consumption | 0.9mA at 108ksps (+3V) - enables >100-hour battery life in 10mA-hr coin-cell systems at moderate throughput |
| Interface | SPI/QSPI/MICROWIRE-compatible 3-wire serial - interoperates with standard MCU peripheral modules without custom firmware drivers |
| Shutdown Current | 0.2µA - reduces system standby power to nanoampere levels during idle intervals |
Pinout & Package
MAX144ACPA+ is housed in an 8-pin Plastic DIP (P8-1) package, through-hole mountable with 0.3" width, 0.1" pin pitch, and industry-standard footprint compatible with legacy prototyping and industrial control PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Positive supply input | Accepts +2.7V to +5.25V; powers analog core, digital logic, and internal reference buffer |
| GND | Analog and digital ground | Single common return node; requires low-impedance connection to minimize noise coupling into T/H stage |
| CH0 (CH+) | Analog input channel 0 / pseudo-differential positive | Single-ended input for MAX144ACPA+; referenced to GND; supports 0–VREF range |
| CH1 (CH−) | Analog input channel 1 / pseudo-differential negative | Second single-ended input (MAX144); not differential in this variant - used alternately with CH0 |
| REF | External reference voltage input | Defines full-scale range; requires 0.1µF bypass capacitor; minimum 18kΩ input resistance |
| CS/SHDN | Active-low chip select / active-high shutdown | Pulling high disables conversion and reduces current to 0.2µA; falling edge initiates acquisition |
| SCLK | Serial clock input | Controls data shift-out timing; determines clock mode (internal vs. external) at CS/SHDN fall edge |
| DOUT | Serial data output | 3-wire MSB-first stream (16-bit format); high-impedance when CS/SHDN = high |
Key Features
| Feature | Design Value |
|---|---|
| Single-supply operation | Eliminates need for dual-rail supplies or charge pumps - simplifies power design in space-constrained portable instruments |
| Automatic power-down | Reduces quiescent current to 0.2µA without external control logic - ideal for wake-on-event sensor nodes |
| Internal track/hold | Removes requirement for external sample-hold circuitry - cuts BOM count and layout area in data-acquisition front-ends |
| 8-pin Plastic DIP package | Enables hand-soldering, socket-based testing, and drop-in replacement in legacy industrial control boards |
| 108ksps sampling with 7.4µs conversion | Supports deterministic timing in closed-loop control systems where latency must remain below 10µs |
Applications
| Battery-Powered Data Loggers | Industrial Process Monitoring |
|---|---|
Use Scenario: Continuous logging of temperature, pressure, and humidity sensors in remote field deployments powered by AA batteries. IC Role / Device Role / Timing Role: Primary ADC digitizing dual analog sensor outputs with automatic channel sequencing and ultra-low sleep current. Use Value: 0.2µA shutdown current extends battery life to >2 years; 12-bit resolution captures sub-degree thermal drift without oversampling. |
Use Scenario: Real-time monitoring of motor winding voltages and current shunt signals in PLC I/O modules. IC Role / Device Role / Timing Role: Dual-channel front-end ADC providing synchronized sampling for fault detection algorithms. Use Value: ±0.5 LSB INL ensures repeatability across calibration cycles; 108ksps supports 50Hz harmonic analysis up to 25th order. |
| Medical Vital Sign Monitors | Isolated Sensor Interfaces |
Use Scenario: Portable ECG and pulse oximetry devices requiring low-noise, low-power analog signal acquisition. IC Role / Device Role / Timing Role: Signal-chain ADC converting conditioned biopotential signals with minimal self-heating and supply ripple sensitivity. Use Value: 70dB SINAD and –85dB channel crosstalk prevent cross-talk between lead I/II/III measurements; 2.7V min supply enables direct Li-ion battery operation. |
Use Scenario: Digitizing isolated bridge sensor outputs (e.g., load cells) using optocoupler- or transformer-isolated digital interfaces. IC Role / Device Role / Timing Role: Local-side ADC interfaced via SPI to isolated UART or digital isolator, minimizing high-voltage domain complexity. Use Value: 3-wire interface reduces isolation channel count vs. parallel ADCs; 8-pin DIP eases creepage/clearance layout in reinforced isolation barriers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX144BCPA+ | Same package and pinout; ±1 LSB INL (vs. ±0.5 LSB for MAX144ACPA+) | Acceptable for cost-sensitive industrial monitoring where 12-bit monotonicity suffices but absolute linearity is relaxed | Select MAX144BCPA+ when total unadjusted error budget allows ±1 LSB INL and temperature drift tolerance is wider |
| ADS7822U | 8-pin SOIC package; 12-bit, 200ksps; no internal T/H; requires external reference; SPI-only interface | Better speed but lacks auto-channel switching and integrated T/H - demands additional external components | Choose ADS7822U only if higher throughput is critical and board space permits external T/H/reference circuitry |
Compared with MAX144BCPA+, MAX144ACPA+ provides tighter DC accuracy for calibration-critical instrumentation; compared with ADS7822U, it delivers lower system-level BOM count and simplified layout due to integrated T/H and dual-channel sequencing - making it optimal for compact, battery-operated dual-sensor nodes.
Availability
MAX144ACPA+ is available at Aetrix Electronics and suitable for battery-powered data loggers, industrial process monitors, and medical vital sign recorders requiring stable component supply across extended production lifecycles.
Supply support for MAX144ACPA+ 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 - emphasizing single-supply operation, integrated track/hold, and serial interface simplicity for portable and embedded sensor nodes.
FAQ
What is the operating temperature range for MAX144ACPA+?
The MAX144ACPA+ is specified for 0°C to +70°C ambient operation, matching the 'C' grade designation in its ordering code. This range supports commercial and industrial indoor environments, including handheld test equipment and factory-floor data loggers where ambient thermal excursions remain within these limits. The device maintains ±0.5 LSB INL and full 108ksps performance across this interval, with validated dynamic specs including 70dB SINAD and –85dB crosstalk.
Does MAX144ACPA+ require an external reference voltage?
Yes, MAX144ACPA+ requires an external reference voltage applied to the REF pin. It does not include an internal reference. The reference must be stable, capable of sourcing 250µA DC load current, and have output impedance ≤10Ω. A 0.1µF ceramic bypass capacitor is mandatory at the REF pin for noise suppression. Reference voltage sets the full-scale input range (0 to VREF), and typical use cases employ 2.5V references for optimal SNR and headroom.
How does channel selection work on MAX144ACPA+?
MAX144ACPA+ automatically alternates between CH0 and CH1 on successive conversions after power-on reset - starting with CH0. Channel switching is controlled by toggling the CS/SHDN pin: one low pulse initiates CH0 conversion, the next low pulse triggers CH1, and so on. To convert the same channel repeatedly, toggle CS/SHDN twice between conversions. The channel ID bit (CHID) appears in the serial output stream, enabling firmware to identify source channel without external multiplexer control.
What serial interface standards does MAX144ACPA+ support?
MAX144ACPA+ supports SPI, QSPI, and MICROWIRE protocols natively via its 3-wire interface (CS/SHDN, SCLK, DOUT). It operates with CPOL = 0 and CPHA = 0, and DOUT transitions on the falling edge of SCLK while data is sampled on the rising edge. No protocol-specific configuration registers are needed - compatibility is achieved through timing and framing alone, allowing direct connection to standard MCU SPI peripherals without glue logic or firmware adaptation.
Can MAX144ACPA+ operate from a 3.3V supply?
Yes, MAX144ACPA+ fully supports +3.3V operation within its specified +2.7V to +5.25V supply range. At +3.3V, it draws 0.9mA at maximum 108ksps throughput and maintains all AC/DC specifications including ±0.5 LSB INL, 70dB SINAD, and 2.5µs wake-up time. The 3.3V supply also powers the digital interface directly, eliminating level shifters when interfacing with 3.3V microcontrollers - a key advantage in modern low-voltage embedded systems.
MAX144ACPA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- 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-PDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
MAX144ACPA+ FAQ
1.How can I place an order for MAX144ACPA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX144ACPA+ 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 MAX144ACPA+ reliable?
The price and inventory of MAX144ACPA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX144ACPA+ is usually 5 days.
3.What payment methods are accepted for MAX144ACPA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX144ACPA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX144ACPA+?
MAX144ACPA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX144ACPA+ 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 MAX144ACPA+?
For technical support, including MAX144ACPA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX144ACPA+ requirements.
6.How does Aetrix verify that MAX144ACPA+ is sourced from the original manufacturer or authorized distributors?
All MAX144ACPA+ 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 MAX144ACPA+ meets industry standards.
7.What is the process for return or replacement of MAX144ACPA+?
All MAX144ACPA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX144ACPA+, 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 MAX144ACPA+ part is unused and in its original packaging.
Return procedure for MAX144ACPA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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