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Analog Devices Inc./Maxim Integrated MAX144BCPA
- Part No.:
- MAX144BCPA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX144BCPA.pdf
- Description:
- IC ADC 12BIT SAR 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,320
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Product details
Overview
MAX144BCPA from Maxim Integrated is a 12-bit, 2-channel, single-ended successive-approximation analog-to-digital converter (ADC) in an 8-pin plastic DIP package. It operates from +2.7V to +5.25V, delivers 108ksps sampling rate, ±1 LSB INL accuracy, and consumes only 0.9mA at full speed - ideal for battery-powered data loggers and isolated industrial sensor interfaces.
For engineers reviewing the MAX144BCPA datasheet, MAX144BCPA pinout, MAX144BCPA application, or MAX144BCPA equivalent, this page provides verified technical context, real-world design meanings of key specs, validated pin functions, application-specific implementation guidance, and two confirmed alternative parts with documented functional and packaging differences.
Technical Context
The MAX144BCPA uses an on-chip track-and-hold with 7.4µs conversion time and internal clock generation (±20% tolerance at ~2MHz), enabling SPI/QSPI/MICROWIRE-compatible 3-wire serial output without external timing components. Its analog input structure supports two single-ended channels (CH0, CH1) referenced to GND, with automatic channel alternation triggered by CS/SHDN toggling.
It features automatic power-down mode (0.2µA typical) activated when CS/SHDN = VDD, and wake-up time of 2.5µs with stable reference. Input protection diodes allow safe operation within GND − 300mV to VDD + 300mV, though accurate conversion requires input signals between GND − 50mV and VDD + 50mV.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR architecture - delivers 1 LSB = VREF/4096 quantization step for precise sensor digitization |
| Sampling Rate | 108ksps maximum - supports real-time monitoring of fast transients up to ~50kHz via undersampling |
| INL Accuracy | ±1 LSB over 0°C to +70°C - ensures monotonicity and <0.024% full-scale error in closed-loop control |
| Supply Current | 0.9mA at 108ksps, +3V - enables >100-hour runtime on a 100mAh coin cell in burst-sampling mode |
| Power-Down Current | 0.2µA - reduces annual standby drain to <1.8µAh, critical for unattended remote sensors |
| Reference Input | External REF pin (0–VDD+50mV range) - requires ≥18kΩ DC impedance and ≤10Ω source impedance for <1LSB error |
| Serial Interface | SPI/QSPI/MICROWIRE-compatible 3-wire (CS/SHDN, SCLK, DOUT) - no MISO/MOSI direction control needed |
Pinout & Package
MAX144BCPA is housed in an 8-pin plastic DIP (P8-1) package with 0.3-inch body width and through-hole mounting. Pin spacing is 0.1 inch (2.54mm), compatible with standard PCB footprints and socketing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 1) | Positive supply input | Accepts +2.7V to +5.25V; powers all analog/digital circuitry; bypass with 0.1µF ceramic near pin |
| 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 on successive conversions |
| GND (Pin 4) | Analog and digital ground | Common return for VDD, REF, and analog inputs; must be low-impedance star point |
| REF (Pin 5) | External reference voltage input | Sets full-scale range (0 to VREF); requires 0.1µF capacitor to GND for noise suppression |
| CS/SHDN (Pin 6) | Chip-select / shutdown control | Active-high shutdown (0.2µA); active-low enables conversion and serial output |
| DOUT (Pin 7) | Serial data output | 3-state CMOS output; data valid on SCLK falling edge; high-impedance when CS/SHDN = VDD |
| SCLK (Pin 8) | Serial clock input | Drives data shift-out and controls internal clock mode selection (high = internal, low = external) |
Key Features
| Feature | Design Value |
|---|---|
| Single-supply operation | +2.7V to +5.25V range eliminates need for dual-rail supplies in portable instrumentation |
| Internal track-and-hold | 7.4µs conversion + 2.5µs wake-up enables sub-10µs total latency per sample in burst mode |
| Auto power-down | 0.2µA shutdown current reduces system-level quiescent power by >99.9% during idle intervals |
| Small-package footprint | 8-pin DIP occupies <0.3 in² PCB area - fits legacy designs and space-constrained sensor nodes |
| 3-wire serial interface | No dedicated MISO/MOSI lines required; simplifies microcontroller GPIO usage and routing density |
Applications
| Battery-Powered Data Loggers | Industrial Process Monitoring |
|---|---|
Use Scenario: Continuous voltage/current measurement from thermocouples, RTDs, or 4–20mA loops in field-deployed environmental sensors. IC Role / Device Role / Timing Role: Primary ADC converting dual analog inputs into serial digital streams synchronized to microcontroller polling cycles. Use Value: 108ksps throughput and 0.9mA active current enable 1-second sampling intervals with multi-year battery life using AA cells. |
Use Scenario: Real-time acquisition of pressure, flow, and temperature signals in PLC I/O modules with isolation barriers. IC Role / Device Role / Timing Role: Isolated-side ADC providing galvanically separated analog front-end digitization before opto-coupled serial transmission. Use Value: ±1 LSB INL and 0.2µA shutdown current ensure long-term calibration stability and minimal standby power in always-on systems. |
| Portable Medical Instruments | System Supervision Circuits |
Use Scenario: Vital sign monitoring (ECG lead voltage, SpO₂ photodiode outputs) in handheld diagnostic devices. IC Role / Device Role / Timing Role: Low-noise, low-power ADC capturing biopotential waveforms with minimal thermal drift across operating temperature range. Use Value: 2.25MHz small-signal bandwidth supports clean acquisition of ECG harmonics up to 150Hz without aliasing artifacts. |
Use Scenario: Voltage rail monitoring (1.2V, 3.3V, 5V, 12V) and temperature sensing in server power supplies and telecom rectifiers. IC Role / Device Role / Timing Role: Multi-channel supervision ADC feeding fault detection logic and telemetry reporting via I²C/SPI bridge. Use Value: Dual-channel capability allows simultaneous tracking of primary and backup rails, reducing component count vs. single-channel solutions. |
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 |
|---|---|---|---|
| MAX144ACPA | Same package and pinout; ±0.5 LSB INL (vs. ±1 LSB for MAX144BCPA); tighter DC accuracy over 0°C to +70°C | Preferred for precision sensor calibration where <0.5 LSB linearity error is required | Select MAX144ACPA when absolute accuracy outweighs cost sensitivity; otherwise MAX144BCPA offers optimal balance of performance and price |
| ADS7822U | 8-pin SOIC package (not DIP); 12-bit SAR; 200ksps max; 2.7–5.5V supply; SPI-only interface; no internal T/H | Requires external track-and-hold or low-Z source; better suited for high-speed, board-space-constrained designs | Choose ADS7822U only if SOIC footprint and higher throughput are mandatory; MAX144BCPA remains superior for through-hole, low-power, and ease-of-use requirements |
Compared with MAX144ACPA, MAX144BCPA trades 0.5 LSB INL for lower cost and broader production availability; compared with ADS7822U, it retains DIP compatibility and integrated T/H - eliminating external components and layout complexity in legacy or ruggedized systems.
Availability
MAX144BCPA is available at Aetrix Electronics and suitable for battery-powered data loggers, industrial process monitors, portable medical instruments, and system supervision circuits requiring stable component supply across extended production lifecycles.
Supply support for MAX144BCPA 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, automotive, and communications markets.
The MAX144 family was designed specifically for low-power, space-constrained data-acquisition systems requiring reliable 12-bit resolution with minimal external components and flexible serial interfacing.
FAQ
What is the operating temperature range for MAX144BCPA?
The MAX144BCPA is specified for operation from 0°C to +70°C. This commercial-grade temperature range is validated per the device's ordering information table and applies to all electrical characteristics including INL (±1 LSB), sampling rate (108ksps), and supply current (0.9mA at +3V). It is not rated for extended industrial or automotive ranges - those require MAX144BEPA (−40°C to +85°C) or MAX144BMJA (−55°C to +125°C).
Does MAX144BCPA include an internal reference voltage?
No, MAX144BCPA does not include an internal reference. It requires an external reference voltage applied to the REF pin, with a recommended value of 2.5V. The REF input accepts voltages from 0V to VDD + 50mV, but stable operation demands a low-impedance source (<10Ω) capable of supplying 250µA transient current during conversion. A 0.1µF bypass capacitor to GND is mandatory for noise reduction.
How does the MAX144BCPA handle channel selection between CH0 and CH1?
The MAX144BCPA automatically alternates between CH0 and CH1 on successive conversions after power-on reset - CH0 is sampled first, then CH1, then CH0 again. Channel switching is controlled by toggling the CS/SHDN pin: a falling edge initiates conversion on the next channel. To sample the same channel repeatedly, toggle CS/SHDN twice between conversions. The channel ID bit (CHID) appears in the serial output stream to identify which channel produced each result.
What is the minimum wake-up time for MAX144BCPA from shutdown mode?
The guaranteed maximum wake-up time for MAX144BCPA from shutdown mode is 2.5µs, measured from CS/SHDN falling edge to valid DOUT data. This assumes the external reference is stable to within ±1 LSB. If the reference is unstable, additional delay must be added to allow reference settling - typically several microseconds depending on reference source and bypass capacitance.
Is MAX144BCPA pin-compatible with the MAX145 series?
No, MAX144BCPA is not pin-compatible with MAX145 variants. While both share the same 8-pin DIP package and pin numbering, their analog input configurations differ fundamentally: MAX144BCPA uses two single-ended inputs (CH0, CH1), whereas MAX145 devices implement one pseudo-differential pair (CH+, CH−). Connecting a MAX145 to a MAX144BCPA layout will result in incorrect signal routing and invalid conversions.
MAX144BCPA 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:
- 0°C ~ 70°C
- Supplier Device Package:
- 8-PDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
MAX144BCPA FAQ
1.How can I place an order for MAX144BCPA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX144BCPA 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 MAX144BCPA reliable?
The price and inventory of MAX144BCPA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX144BCPA is usually 5 days.
3.What payment methods are accepted for MAX144BCPA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX144BCPA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX144BCPA?
MAX144BCPA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX144BCPA 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 MAX144BCPA?
For technical support, including MAX144BCPA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX144BCPA requirements.
6.How does Aetrix verify that MAX144BCPA is sourced from the original manufacturer or authorized distributors?
All MAX144BCPA 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 MAX144BCPA meets industry standards.
7.What is the process for return or replacement of MAX144BCPA?
All MAX144BCPA units undergo pre-shipment inspection (PSI). If there is an issue with MAX144BCPA, 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 MAX144BCPA part is unused and in its original packaging.
Return procedure for MAX144BCPA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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