My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX144AEPA
- Part No.:
- MAX144AEPA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX144AEPA.pdf
- Description:
- IC ADC 12BIT SAR 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,068
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX144AEPA 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 - designed for precision battery-powered data acquisition in portable instrumentation and process monitoring.
For engineers reviewing the MAX144AEPA datasheet, MAX144AEPA pinout, MAX144AEPA application, or MAX144AEPA equivalent, this page delivers verified electrical specs, package mapping to 8-pin Plastic DIP (P8-1), functional role in signal digitization chains, and validated alternative options for low-power 12-bit serial ADC selection.
Technical Context
The MAX144AEPA implements a SAR architecture with integrated track-and-hold, supporting single-supply operation from +2.7V to +5.25V and delivering 7.4µs conversion time at 108ksps. Its internal clock enables flexible timing control, while automatic power-down reduces current to 0.2µA when unselected.
It accepts 0V to VREF analog inputs on CH0 and CH1, uses CS/SHDN as combined chip-select/shutdown control, and outputs 16-bit serial frames (three leading 1s + CHID + 12-bit MSB-first data) synchronized to SCLK's falling edge - fully compatible with SPI, QSPI, and MICROWIRE protocols.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - provides 4096 discrete output codes for high-fidelity analog signal digitization |
| Sampling Rate | 108ksps - supports real-time capture of signals up to ~50kHz Nyquist bandwidth |
| INL | ±0.5 LSB - ensures monotonicity and <0.012% full-scale linearity error across temperature |
| Supply Voltage Range | +2.7V to +5.25V - enables direct interfacing with 3.3V and 5V logic/system rails |
| Power Consumption | 0.9mA at 108ksps (+3V) - allows >100hr operation on a 100mAh coin cell in continuous mode |
| Operating Temperature | -40°C to +85°C - qualified for industrial environments without derating |
| Interface | 3-wire SPI/QSPI/MICROWIRE - eliminates need for parallel bus routing and reduces MCU GPIO count |
Pinout & Package
MAX144AEPA is housed in an 8-pin Plastic DIP package (package code P8-1), through-hole mountable with 0.3" wide body and standard 0.1" pin pitch - suitable for prototyping, industrial control boards, and legacy systems requiring socketed ICs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 1) | Positive supply input | Accepts +2.7V to +5.25V; powers all analog and digital circuitry including 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 automatic sequencing mode |
| GND (Pin 4) | Analog and digital ground | Common return for analog inputs, reference, and digital I/O - must be low-impedance |
| REF (Pin 5) | External reference voltage input | Sets full-scale range (0V to VREF); requires 0.1µF bypass capacitor for noise immunity |
| CS/SHDN (Pin 6) | Chip-select / shutdown control | Active-high shutdown (≤0.2µA) and active-low enable; also selects internal/external clock mode |
| DOUT (Pin 7) | Serial data output | 3-state output; data valid on SCLK falling edge; high-impedance when CS/SHDN = high |
| SCLK (Pin 8) | Serial clock input | Drives data shift-out and (in external mode) controls conversion timing; compatible with 0–2.17MHz clocks |
Key Features
| Feature | Design Value |
|---|---|
| Single-supply operation | Eliminates dual-rail supplies and level-shifters - simplifies power design in space-constrained systems |
| Automatic power-down | Reduces quiescent current to 0.2µA during idle periods - extends battery life in intermittent-sampling applications |
| On-chip track-and-hold | Removes need for external sample-hold circuitry - lowers BOM cost and board area for DC-coupled sensors |
| Internal oscillator | Enables conversion without external clock source - decouples timing from host MCU clock domain |
| 8-pin DIP package | Supports hand-soldering, socket-based testing, and drop-in replacement in legacy industrial PCBs |
Applications
| Portable Data Logging | Battery-Powered Instrumentation |
|---|---|
Use Scenario: Standalone environmental sensor node logging temperature, humidity, and pressure over weeks on coin-cell power. IC Role / Device Role / Timing Role: Primary ADC digitizing conditioned analog outputs from multiple transducers via sequential CH0/CH1 sampling. Use Value: 0.9mA active current and 0.2µA shutdown enable >1-year battery life; 12-bit resolution captures sub-degree thermal changes. |
Use Scenario: Handheld multimeter with dual-input capability for simultaneous voltage/current measurement. IC Role / Device Role / Timing Role: Dual-channel front-end ADC acquiring isolated analog inputs with minimal external components. Use Value: Single-ended architecture and internal T/H eliminate external op-amp buffers; 8-pin DIP eases calibration fixture integration. |
| Process-Control Monitoring | Isolated Data Acquisition |
Use Scenario: DIN-rail mounted PLC module monitoring 4–20mA loop signals from field transmitters. IC Role / Device Role / Timing Role: Precision ADC converting scaled loop outputs into digital values for Modbus RTU transmission. Use Value: ±0.5 LSB INL ensures <0.012% measurement accuracy across -40°C to +85°C ambient - meets SIL-2 functional safety margins. |
Use Scenario: Medical patient monitor acquiring ECG and respiration signals with galvanic isolation. IC Role / Device Role / Timing Role: Isolated-side ADC digitizing low-noise analog front-end outputs before opto-coupled serial transmission. Use Value: 3-wire SPI interface minimizes isolated side pin count; 108ksps supports >50kHz anti-aliasing filter cutoffs. |
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 |
|---|---|---|---|
| MAX144BCPA | Same 8-pin DIP package and pinout, but ±1 LSB INL and 0°C to +70°C temp range | Lower accuracy and commercial temperature grade - suitable for non-critical consumer test gear | Select when cost sensitivity outweighs industrial temperature and linearity requirements |
| ADS7822U | 12-bit, 200ksps, SPI-only interface, 6-pin SOT-23 package, no internal T/H, 2.7–5.5V supply | Higher speed but no track-and-hold; requires external sampling circuitry and layout optimization for AC performance | Choose for ultra-compact designs where board space is constrained and external T/H is acceptable |
Compared with MAX144BCPA, the MAX144AEPA offers tighter linearity (±0.5 vs ±1 LSB) and extended temperature support (-40°C to +85°C), making it preferable for industrial deployments; versus ADS7822U, MAX144AEPA integrates track-and-hold and uses through-hole packaging - reducing design risk in noise-sensitive or mechanically demanding environments.
Availability
MAX144AEPA is available at Aetrix Electronics and suitable for portable data logging, battery-powered instrumentation, and process-control monitoring requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX144AEPA 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 industrial, medical, and communications applications - emphasizing reliability, integration, and low-power operation.
The MAX144 family targets low-power, high-accuracy data acquisition systems where small size, single-supply operation, and robust serial interfacing are critical - especially in portable and distributed sensing nodes.
FAQ
What is the maximum sampling rate of the MAX144AEPA?
The MAX144AEPA achieves a maximum sampling rate of 108ksps with 7.4µs conversion time per sample. This rate is sustained under specified conditions: VDD = +2.7V to +5.25V, VREF = 2.5V, fSCLK = 2.17MHz, and 16-clock conversion cycle. At lower throughput rates, automatic power-down further reduces current consumption - enabling adaptive sampling strategies in energy-constrained systems using the MAX144AEPA.
Does the MAX144AEPA include an internal reference voltage?
No, the MAX144AEPA requires an external reference voltage applied to the REF pin. It does not contain an internal reference. The device accepts 0V to VDD + 50mV at REF, with minimum DC input resistance of 18kΩ and ability to sink up to 250µA during conversion. A 0.1µF bypass capacitor is mandatory at REF for stable operation - confirming that reference design responsibility lies entirely outside the MAX144AEPA itself.
What is the function of the CS/SHDN pin on the MAX144AEPA?
The CS/SHDN pin on the MAX144AEPA serves dual functions: as an active-low chip-select input and an active-high shutdown control. When pulled low, it initiates conversion and enables serial output; when held high, it places the MAX144AEPA into shutdown mode drawing ≤0.2µA. Additionally, the logic state of SCLK at the CS/SHDN falling edge determines internal (SCLK high) or external (SCLK low) clock mode - making CS/SHDN central to both power management and interface configuration of the MAX144AEPA.
Can the MAX144AEPA interface directly with an SPI master microcontroller?
Yes, the MAX144AEPA is fully compatible with standard SPI interfaces when configured with CPOL = 0 and CPHA = 0. It outputs data on the falling edge of SCLK and expects sampling on the rising edge - matching standard SPI Mode 0 timing. The MAX144AEPA requires no additional level-shifting or protocol translation, and its 3-wire interface (CS/SHDN, SCLK, DOUT) connects directly to common MCU SPI peripherals - confirmed by Maxim's application notes and verified in production designs using the MAX144AEPA.
What is the input voltage range for analog channels on the MAX144AEPA?
The MAX144AEPA analog inputs (CH0 and CH1) operate in single-ended mode with a voltage range of 0V to VREF. The device does not support rail-to-rail input beyond VREF, and inputs must remain within GND − 50mV to VREF + 50mV for accurate conversion. Input protection diodes clamp to VDD and GND, allowing transient excursions to GND − 300mV to VDD + 300mV without damage - but precise digitization is only guaranteed within the 0V to VREF window specified for the MAX144AEPA.
MAX144AEPA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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-PDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
MAX144AEPA FAQ
1.How can I place an order for MAX144AEPA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX144AEPA 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 MAX144AEPA reliable?
The price and inventory of MAX144AEPA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX144AEPA is usually 5 days.
3.What payment methods are accepted for MAX144AEPA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX144AEPA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX144AEPA?
MAX144AEPA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX144AEPA 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 MAX144AEPA?
For technical support, including MAX144AEPA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX144AEPA requirements.
6.How does Aetrix verify that MAX144AEPA is sourced from the original manufacturer or authorized distributors?
All MAX144AEPA 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 MAX144AEPA meets industry standards.
7.What is the process for return or replacement of MAX144AEPA?
All MAX144AEPA units undergo pre-shipment inspection (PSI). If there is an issue with MAX144AEPA, 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 MAX144AEPA part is unused and in its original packaging.
Return procedure for MAX144AEPA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX144AEPA Tags
-
ADC081C021CIMKX/NOPB
Texas Instruments
-
MCP3021A5T-E/OT
Microchip Technology
-
TLA2024IRUGR
Texas Instruments
-
MCP3221A5T-E/OT
Microchip Technology
-
MCP3221A5T-I/OT
Microchip Technology
-
MCP3221A4T-E/OT
Microchip Technology
-
MCP3221A6T-E/OT
Microchip Technology
-
MCP3221A0T-E/OT
Microchip Technology
-
MCP3221A1T-E/OT
Microchip Technology
-
ADC121S021CIMFX/NOPB
Texas Instruments
-
MCP3001-I/MS
Microchip Technology
-
MCP3001-I/SN
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
