My Inquiry
My Account
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:4,965
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
The MAX144BCPA+ from Maxim Integrated is a low-power, 12-bit successive-approximation analog-to-digital converter (SAR ADC) in an 8-pin plastic DIP package, supporting single-supply operation from +2.7V to +5.25V, delivering 108ksps sampling rate, ±1 LSB INL accuracy, and automatic power-down mode consuming only 0.2µA. It provides two single-ended input channels (CH0, CH1), internal track/hold, and SPI/QSPI/MICROWIRE-compatible 3-wire serial interface - ideal for portable data logging and battery-powered instrumentation.
For engineers reviewing the MAX144BCPA+ datasheet, MAX144BCPA+ pinout, MAX144BCPA+ application, or MAX144BCPA+ equivalent, this page delivers verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternative parts with documented differences, and supply-ready availability details - all grounded in Maxim's official MAX144/MAX145 datasheet Rev 2 (10/05).
Technical Context
The MAX144BCPA+ implements a SAR architecture with integrated track-and-hold (T/H), where acquisition occurs on the falling edge of CS/SHDN and conversion completes in 7.4µs using either internal laser-trimmed oscillator (2MHz ±20%) or external clock (100kHz–2.17MHz). Channel selection alternates between CH0 and CH1 via CS/SHDN toggling, with channel ID embedded in the 16-bit serial output stream.
It operates exclusively in single-ended mode with inputs referenced to GND, accepts 0V to VREF analog signals, and requires an external reference (2.5V typical) capable of sourcing 250µA with ≤10Ω output impedance. Input protection diodes clamp signals to GND −300mV / 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 4096 discrete digital codes over full-scale range, enabling sub-millivolt resolution with 2.5V reference. |
| Sampling Rate | 108ksps - supports real-time capture of signals up to ~50kHz Nyquist bandwidth; sufficient for vibration monitoring and sensor readout. |
| INL (Integral Nonlinearity) | ±1 LSB - ensures monotonicity and <0.024% full-scale error, critical for precision measurement linearity. |
| Power Consumption | 0.9mA at 108ksps (+3V) - enables >100-hour operation on a 100mAh coin cell when paired with duty-cycled wake-up. |
| Shutdown Current | 0.2µA - reduces quiescent draw by 4500× vs active mode, essential for multi-year battery life in remote sensors. |
| Serial Interface | SPI/QSPI/MICROWIRE-compatible 3-wire - interoperates directly with STM32, PIC, and MSP430 without level-shifting or protocol translation. |
| Input Structure | 2-channel single-ended (CH0, CH1) - allows independent sampling of two ground-referenced sensors (e.g., temperature + pressure) without external multiplexer. |
Pinout & Package
MAX144BCPA+ uses an 8-pin plastic DIP (dual in-line 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; must be decoupled with ≥0.1µF ceramic capacitor near pin to suppress switching noise. |
| CH0 (Pin 2) | Analog input channel 0 | Single-ended input referenced to GND; sampled first after power-on reset; supports 0V to VREF range. |
| CH1 (Pin 3) | Analog input channel 1 | Single-ended input referenced to GND; sampled second in sequence; shares same VREF and acquisition timing as CH0. |
| GND (Pin 4) | Analog and digital ground | Common return for analog inputs, reference, and digital I/O; must be connected to low-impedance system ground plane. |
| REF (Pin 5) | External reference voltage input | Sets full-scale range (e.g., 2.5V → 0.61mV/LSB); requires 0.1µF bypass capacitor to minimize noise-induced INL degradation. |
| CS/SHDN (Pin 6) | Active-low chip select / active-high shutdown | Pulling high disables conversion and forces 0.2µA shutdown current; falling edge initiates wake-up and conversion start. |
| DOUT (Pin 7) | Serial data output | 3-wire interface output; tri-states when CS/SHDN = high; data valid on SCLK falling edge; MSB-first 16-bit frame format. |
| SCLK (Pin 8) | Serial clock input | Drives data transfer and (in external mode) conversion timing; rising edge clocks data into host; falling edge updates DOUT. |
Key Features
| Feature | Design Value |
|---|---|
| Single-supply operation | +2.7V to +5.25V compatibility eliminates need for dual-rail supplies in portable systems, simplifying power architecture. |
| Automatic power-down | 0.2µA shutdown current achieved without external control logic - host MCU only needs to toggle CS/SHDN to manage sleep/wake cycles. |
| Fast wake-up time | 2.5µs wake-up enables burst-mode sampling (e.g., 10ms on / 990ms off) while maintaining responsiveness to transient events. |
| On-chip track/hold | Integrated T/H with 7.4µs conversion time removes need for external sample-hold circuitry, reducing BOM count and board area. |
| SPI/QSPI/MICROWIRE compatibility | Direct interface with industry-standard microcontrollers avoids custom firmware drivers or bit-banging overhead. |
| Space-saving DIP package | 8-pin plastic DIP supports prototyping, manual assembly, and legacy industrial PCBs without requiring re-layout for µMAX alternatives. |
Applications
| Battery-Powered Data Loggers | Portable Medical Sensors |
|---|---|
Use Scenario: Continuous 24-hour environmental monitoring (temperature, humidity) in field-deployed IoT nodes powered by AA batteries. IC Role / Device Role / Timing Role: Dual-channel ADC digitizing two analog sensor outputs sequentially, with automatic shutdown between samples to extend battery life. Use Value: 0.2µA shutdown current enables >5-year operation on 2xAA alkaline cells, while 108ksps supports oversampling for noise reduction in low-drift measurements. |
Use Scenario: Handheld pulse oximeter acquiring synchronized red/infrared photodiode signals for SpO₂ calculation. IC Role / Device Role / Timing Role: Single-ended 12-bit digitizer capturing two analog front-end channels with precise timing alignment and minimal inter-channel crosstalk (<−85dB). Use Value: ±1 LSB INL and 70dB SINAD ensure clinical-grade accuracy in oxygen saturation computation without post-calibration linearization. |
| Industrial Process Monitoring | Test Equipment Signal Acquisition |
Use Scenario: DIN-rail mounted PLC module measuring 4–20mA loop currents and thermocouple voltages in factory automation. IC Role / Device Role / Timing Role: Precision ADC interfacing with isolated signal conditioners, converting two analog inputs per cycle with stable reference tracking. Use Value: 0.8ppm/°C gain tempco and ±3 LSB gain error over −40°C to +85°C allow uncalibrated operation across industrial temperature ranges. |
Use Scenario: Benchtop multimeter or oscilloscope auxiliary channel digitizing low-frequency analog waveforms (≤50kHz) with high DC accuracy. IC Role / Device Role / Timing Role: High-resolution SAR ADC providing 12-bit resolution and 108ksps throughput for waveform capture and RMS calculation. Use Value: 2.25MHz small-signal bandwidth supports undersampling of higher-frequency signals, while 16pF input capacitance minimizes loading on passive probe circuits. |
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 |
|---|---|---|---|
| MAX144ACPA+ | Same 8-pin DIP package and pinout, but ±0.5 LSB INL (vs. ±1 LSB) and 0°C to +70°C temp range (same as MAX144BCPA+). | Higher linearity required in calibration-critical lab equipment where <0.012% full-scale error is mandatory. | Select MAX144ACPA+ when absolute accuracy outweighs cost sensitivity; MAX144BCPA+ remains optimal for cost-constrained industrial sensing. |
| ADS7822U | 12-bit, 200ksps, 8-pin SOIC package, SPI-only interface, no internal T/H, requires external reference and clock. | Used in space-constrained PCBs where SOIC footprint is preferred and external T/H is acceptable for higher-speed sampling. | Choose ADS7822U only if board layout favors SOIC and system already provides precision clock/reference; MAX144BCPA+ integrates more functionality in DIP form. |
Compared with MAX144ACPA+, the MAX144BCPA+ trades 0.5 LSB linearity for broader production tolerance and lower unit cost, while versus ADS7822U it offers integrated T/H, DIP packaging, and guaranteed 108ksps performance without external timing components - making it superior for rapid prototyping and legacy-compatible designs.
Availability
MAX144BCPA+ is available at Aetrix Electronics and suitable for battery-powered data loggers, portable medical sensors, and industrial process monitors requiring stable component supply with long-term manufacturability and consistent parametric performance.
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/MAX145 product line was designed specifically for ultra-low-power, space-constrained data acquisition systems requiring 12-bit resolution, serial interface simplicity, and robust operation across extended temperature ranges.
FAQ
What is the maximum sampling rate of the MAX144BCPA+?
The MAX144BCPA+ achieves a maximum sampling rate of 108ksps under specified conditions (VDD = +2.7V to +5.25V, fSCLK = 2.17MHz, 16 clocks/conversion). This rate is maintained across its full operating temperature range (0°C to +70°C) and supports real-time capture of signals up to ~50kHz bandwidth using Nyquist criteria. The MAX144BCPA+ datasheet confirms this value in the "CONVERSION RATE" section with typical performance at TA = +25°C.
Does the MAX144BCPA+ require an external reference voltage?
Yes, the MAX144BCPA+ requires an external reference voltage applied to the REF pin. It does not include an internal reference. The device accepts 0V to VDD +50mV at REF, with 2.5V being the typical value used to achieve full 12-bit resolution. The reference must source up to 250µA DC load current and exhibit ≤10Ω output impedance; a 0.1µF bypass capacitor is mandatory at the REF pin for stable operation per the MAX144BCPA+ datasheet Figure 4 and Electrical Characteristics table.
What is the function of the CS/SHDN pin on the MAX144BCPA+?
The CS/SHDN pin on the MAX144BCPA+ serves a dual role: it acts as an active-low chip-select input and an active-high shutdown control. When pulled high, the device enters shutdown mode drawing only 0.2µA. A falling edge on CS/SHDN wakes the device (2.5µs wake-up time), initiates track mode, and starts conversion - making it central to power management and serial interface synchronization. This behavior is explicitly defined in the Pin Description table and Timing Characteristics section of the MAX144BCPA+ datasheet.
Can the MAX144BCPA+ interface directly with an SPI host controller?
Yes, the MAX144BCPA+ interfaces directly with standard SPI hosts using CPOL = 0 and CPHA = 0 configuration. Its 3-wire serial interface (CS/SHDN, SCLK, DOUT) is fully compatible with SPI, QSPI, and MICROWIRE protocols. Data is output MSB-first on DOUT, valid on the falling edge of SCLK, and clocked into the host on the rising edge - matching standard SPI timing. This compatibility is confirmed in the "Connection to Standard Interfaces" section of the MAX144BCPA+ datasheet.
What is the input voltage range for analog channels on the MAX144BCPA+?
The MAX144BCPA+ supports a single-ended analog input range of 0V to VREF on both CH0 and CH1 pins. With a typical 2.5V reference, this corresponds to 0V to 2.5V full-scale. Input signals must remain within GND −50mV to VDD +50mV for accurate conversion, though internal protection diodes tolerate −300mV to VDD +300mV without damage. These limits are specified in the Absolute Maximum Ratings and Analog Inputs sections of the MAX144BCPA+ datasheet.
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:
- 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:
- -
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.
MAX144BCPA+ 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…
