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Analog Devices Inc./Maxim Integrated MAX144BEPA
- Part No.:
- MAX144BEPA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX144BEPA.pdf
- Description:
- IC ADC 12BIT SAR 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,358
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Product details
Overview
MAX144BEPA from Maxim Integrated is a -40°C to +85°C, 12-bit, 2-channel, single-ended successive-approximation analog-to-digital converter (ADC) with SPI/QSPI/MICROWIRE-compatible 3-wire serial interface, 108ksps sampling rate, and 8-pin Plastic DIP package. It operates from +2.7V to +5.25V, consumes 0.9mA at full speed, and features internal track/hold, automatic power-down (0.2µA), and 2.5µs wake-up time. It is used in portable data logging and isolated data acquisition systems requiring low power and compact size.
For engineers reviewing the MAX144BEPA datasheet, MAX144BEPA pinout, MAX144BEPA application, or MAX144BEPA equivalent, this page delivers verified technical context, real-world design meaning for key specs, validated pin functions, confirmed alternative parts with documented differences, and supply-chain support details specific to the MAX144BEPA variant.
Technical Context
The MAX144BEPA implements a SAR architecture with on-chip track-and-hold, supporting two single-ended analog inputs (CH0, CH1) referenced to GND. Conversion is initiated by falling edge of CS/SHDN, with clock mode selected by SCLK state at that edge-internal oscillator (2MHz ±20%) for fSCLK < 100kHz or > 2.17MHz, or external clock (100kHz–2.17MHz) for maximum throughput.
Its 3-wire serial interface outputs a 16-bit frame: three leading '1's, channel ID bit (CHID), then 12 MSB-first data bits. DOUT transitions on SCLK falling edge and enters high-impedance when CS/SHDN is high. Input protection diodes clamp analog inputs to GND −300mV and VDD +300mV, but accurate conversion requires input voltage within GND −50mV to VDD +50mV.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 1 LSB = VREF/4096 quantization step, enabling precise measurement of small signal changes in instrumentation. |
| Sampling Rate | 108ksps - supports real-time capture of signals up to ~54kHz Nyquist bandwidth, suitable for vibration monitoring and sensor readout. |
| INL | ±1 LSB - ensures monotonicity and linearity error ≤ ±0.024% of full scale (at VREF = 2.5V), critical for calibration-sensitive applications. |
| Power Consumption | 0.9mA at 108ksps (+3V) - enables >100-hour battery life in 3V coin-cell-powered loggers with 100ksps duty cycling. |
| Wake-Up Time | 2.5µs - allows rapid response to event-triggered sampling without sacrificing low-power sleep efficiency. |
| Supply Range | +2.7V to +5.25V - interoperates directly with 3.3V and 5V logic domains and mixed-supply systems without level-shifting. |
| Reference Input | External REF (0 to VDD +50mV) - decouples accuracy from VDD noise; requires ≥18kΩ DC input resistance and ≤10Ω source impedance for full performance. |
Pinout & Package
MAX144BEPA uses an 8-pin Plastic DIP (P8-1) package, through-hole mountable, with 0.3" body width and standard 0.1" pin pitch. Pin 1 is VDD; pin 4 is GND; pin 6 is CS/SHDN (active-high shutdown / active-low chip select); pin 7 is DOUT (3-state serial output); pin 8 is SCLK (serial clock input).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 1) | Positive supply input | Accepts +2.7V to +5.25V; powers all analog and digital circuitry; bypassing with 0.1µF capacitor near pin is mandatory for noise immunity. |
| CH0 (Pin 2) | Analog input channel 0 | Single-ended input referenced to GND; sampled first after power-on reset; source impedance ≤1kΩ avoids AC performance degradation. |
| CH1 (Pin 3) | Analog input channel 1 | Single-ended input referenced to GND; alternates with CH0; channel ID bit in output stream distinguishes readings. |
| GND (Pin 4) | Analog and digital ground | Common reference for all analog inputs, REF, and digital I/O; must be low-impedance and separated from noisy digital return paths. |
| REF (Pin 5) | External reference voltage input | Sets full-scale range (0 to VREF); requires 0.1µF ceramic bypass to GND; supplies 250µA during conversion; input resistance ≥18kΩ. |
| CS/SHDN (Pin 6) | Chip-select / shutdown control | Pulling high disables conversion and reduces current to 0.2µA; pulling low initiates conversion and wake-up; edge selects internal/external clock mode. |
| DOUT (Pin 7) | Serial data output | 3-state output; drives MSB-first 16-bit frame on SCLK falling edge; high-impedance when CS/SHDN = high; compatible with SPI/QSPI/MICROWIRE. |
| SCLK (Pin 8) | Serial clock input | Drives data shift-out and (in external mode) controls conversion timing; falling edge clocks DOUT; state at CS/SHDN fall determines clock source. |
Key Features
| Feature | Design Value |
|---|---|
| Single-supply operation | Operates from +2.7V to +5.25V - eliminates need for dual-rail supplies in portable or industrial sensors, reducing BOM count and layout complexity. |
| Automatic power-down | 0.2µA shutdown current - extends battery life in intermittent-sampling applications such as environmental monitors with hourly wake-ups. |
| Internal track/hold | 7.4µs conversion time with integrated T/H - removes need for external sample-hold circuitry, saving board space and component cost in compact designs. |
| SPI/QSPI/MICROWIRE compatibility | Standard 3-wire interface with CPOL=0/CPHA=0 timing - enables plug-and-play integration with common microcontrollers (e.g., PIC16, ARM Cortex-M0+) without custom firmware drivers. |
| Small-package footprint | 8-pin Plastic DIP (P8-1) - supports legacy through-hole assembly and prototyping while maintaining compatibility with automated reflow for mixed-technology boards. |
Applications
| Portable Data Logging | Isolated Data Acquisition |
|---|---|
|
Use Scenario: Battery-powered temperature/humidity logger recording every 10 seconds in remote field deployments. IC Role / Device Role / Timing Role: ADC digitizes sensor outputs; CS/SHDN enables ultra-low-power sleep between samples; 2.5µs wake-up minimizes inactive overhead. Use Value: 0.2µA shutdown current and 0.9mA active draw allow >1-year operation on a single CR2032 cell at 10s intervals. |
Use Scenario: Industrial sensor node with optocoupler-isolated microcontroller acquiring analog signals from motor drives. IC Role / Device Role / Timing Role: ADC provides galvanically isolated analog front-end digitization; single-ended inputs simplify connection to isolated op-amp outputs. Use Value: Internal track/hold and 108ksps rate enable accurate capture of transient overcurrent events without external hold capacitor. |
| Process-Control Monitoring | Medical Instruments |
|
Use Scenario: PLC analog input module measuring 4–20mA loop signals from pressure transmitters in chemical plants. IC Role / Device Role / Timing Role: ADC converts conditioned current-loop outputs; REF pin accepts precision 2.5V reference for stable full-scale definition. Use Value: ±1 LSB INL and ±0.05 LSB channel-to-channel gain matching ensure repeatability across multi-channel modules without per-channel calibration. |
Use Scenario: Portable ECG device digitizing amplified biopotential signals with low-noise front-end amplifiers. IC Role / Device Role / Timing Role: ADC performs high-fidelity sampling of filtered biosignals; 2.25MHz small-signal bandwidth supports anti-alias filtering design. Use Value: 70dB SINAD and 80dB SFDR meet Class II medical device requirements for diagnostic-grade waveform fidelity at 10kHz input. |
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 |
|---|---|---|---|
| MAX144AEPA | Same package and pinout, but ±0.5 LSB INL (vs. ±1 LSB) and -40°C to +85°C temp grade - tighter DC accuracy at same operating range. | Preferred where absolute linearity matters more than cost, e.g., calibrated test equipment requiring <0.01% FS error. | Select MAX144AEPA if system-level calibration is impractical and raw INL must be minimized. |
| ADS7822U | 12-bit, 200ksps, SPI-compatible, but requires external reference and has no auto-shutdown; 0.8mA active current at 200ksps. | Better throughput but higher power and no integrated power management - suited for mains-powered, high-speed DAQ rather than battery operation. | Choose ADS7822U only when sampling rate >108ksps is mandatory and continuous operation justifies higher current draw. |
Compared with MAX144BEPA, MAX144AEPA offers improved linearity at identical packaging and temperature range, while ADS7822U trades power efficiency and integrated shutdown for higher speed-making MAX144BEPA optimal for space-constrained, battery-operated systems needing reliable 108ksps performance with minimal support components.
Availability
MAX144BEPA is available at Aetrix Electronics and suitable for portable data logging, isolated data acquisition, and process-control monitoring requiring stable component supply across extended temperature ranges (-40°C to +85°C) and long-lifecycle production.
Supply support for MAX144BEPA 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 high-performance analog, mixed-signal, and power-management ICs for industrial, medical, and communications applications.
The MAX144 family was designed as low-power, serial-output 12-bit ADCs targeting battery-operated instrumentation and space-constrained embedded systems where ease of interface and minimal external components are critical.
FAQ
What is the operating temperature range of the MAX144BEPA?
The MAX144BEPA is rated for -40°C to +85°C ambient operation, making it suitable for industrial environments and outdoor portable equipment. This range is confirmed in the Ordering Information table and applies specifically to the BEPA suffix variant, distinct from the C-grade (0°C to +70°C) or M-grade (-55°C to +125°C) versions.
Does the MAX144BEPA require an external reference voltage?
Yes, the MAX144BEPA requires an external reference voltage applied to the REF pin. It does not include an internal reference. The REF input accepts 0V to VDD +50mV, must supply up to 250µA during conversion, and should be bypassed with a 0.1µF capacitor to GND for optimal noise performance.
How does the MAX144BEPA handle channel selection between CH0 and CH1?
The MAX144BEPA alternates automatically between CH0 and CH1 after each conversion: CH0 is sampled first on power-up, then CH1, then CH0 again. Channel identity is encoded in the CHID bit of the 16-bit serial output frame. Manual channel selection is not supported - toggling CS/SHDN twice consecutively reads the same channel.
What is the minimum acquisition time required before a valid conversion on the MAX144BEPA?
The MAX144BEPA specifies a 7.4µs conversion time, but acquisition time (tACQ) depends on source impedance. With RS ≤1kΩ, tACQ is ≤2.5µs; for higher impedances, tACQ = 9(RS + 9kΩ)(16pF). For example, a 10kΩ source requires ~1.6µs minimum acquisition time before CS/SHDN fall to ensure full 12-bit accuracy.
Can the MAX144BEPA interface directly with an SPI master microcontroller?
Yes, the MAX144BEPA is fully compatible with standard SPI interfaces when configured with CPOL = 0 and CPHA = 0. Its DOUT pin drives data on the SCLK falling edge and is sampled by the MCU on the rising edge. No level-shifting is needed for 3.3V or 5V MCUs, and the 3-wire interface eliminates the need for MOSI lines.
MAX144BEPA 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:
- -
MAX144BEPA FAQ
1.How can I place an order for MAX144BEPA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX144BEPA 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 MAX144BEPA reliable?
The price and inventory of MAX144BEPA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX144BEPA is usually 5 days.
3.What payment methods are accepted for MAX144BEPA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX144BEPA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX144BEPA?
MAX144BEPA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX144BEPA 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 MAX144BEPA?
For technical support, including MAX144BEPA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX144BEPA requirements.
6.How does Aetrix verify that MAX144BEPA is sourced from the original manufacturer or authorized distributors?
All MAX144BEPA 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 MAX144BEPA meets industry standards.
7.What is the process for return or replacement of MAX144BEPA?
All MAX144BEPA units undergo pre-shipment inspection (PSI). If there is an issue with MAX144BEPA, 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 MAX144BEPA part is unused and in its original packaging.
Return procedure for MAX144BEPA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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