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Analog Devices Inc./Maxim Integrated MAX1272BCPA
- Part No.:
- MAX1272BCPA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX1272BCPA.pdf
- Description:
- 12-BIT ADC SELECTABLE INPUT
- Quantity:
- Payment:
- Shipping:
Inventory:846
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Product details
Overview
MAX1272BCPA from Maxim Integrated is a fault-protected, software-programmable 12-bit analog-to-digital converter (ADC) for industrial data acquisition systems. It operates from a single 5V supply, supports ±10V/±5V/0–10V/0–5V input ranges, delivers 87ksps throughput, and features ±12V analog input fault protection. It is used in programmable logic controller (PLC) analog input modules requiring robust signal conditioning and wide-range sensor interfacing.
For engineers reviewing the MAX1272BCPA datasheet, MAX1272BCPA pinout, MAX1272BCPA application, or MAX1272BCPA equivalent, key selection criteria include its 12-bit no-missing-codes performance, SPI/QSPI/MICROWIRE-compatible 3-wire interface, internal 4.096V reference option, ±12V fault tolerance on AIN, and four software-selectable power-down modes for low-power operation in battery-powered or thermally constrained systems.
Technical Context
The MAX1272BCPA employs successive approximation register (SAR) architecture with integrated track-and-hold (T/H), enabling precise digitization of DC and low-frequency signals up to 10kHz. Its resistor-divider input network scales inputs per software-configured RNG/BIP bits, supporting both unipolar and bipolar conversion with two's complement or straight binary output coding.
It uses an 8-bit control byte to configure input range, polarity, reference source (internal 4.096V or external 2.40–4.18V), and one of four power-down modes - including delayed/immediate standby and full power-down - while maintaining active digital interface and fault protection during shutdown.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR ADC with guaranteed no missing codes over temperature |
| Sampling Rate | 87ksps maximum throughput - enables real-time monitoring of fast transients in industrial control loops |
| Analog Input Ranges | Software-selectable: ±10V, ±5V, 0–10V, 0–5V - eliminates external gain-switching circuitry |
| Fault Protection | ±12V continuous overvoltage tolerance on AIN - protects against field wiring faults and ESD events |
| Reference Options | Internal 4.096V (±15ppm/°C) or external 2.40–4.18V - supports precision calibration and system-level reference sharing |
| Power Consumption | 1.5mA at 87ksps (converting), 0.4mA at 10ksps, 1µA in full power-down - enables energy-efficient polling architectures |
| Digital Interface | SPI/QSPI/MICROWIRE-compatible 3-wire serial (SCLK/DIN/DOUT/CS) - interoperates with common microcontrollers without level-shifting |
Pinout & Package
MAX1272BCPA is housed in an 8-pin plastic DIP (PDIP) package with through-hole mounting and 0.3-inch body width, suitable for prototyping, industrial PCBs, and legacy board designs requiring manual assembly or socketing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SCLK | Serial clock input | Controls timing of control-byte input and conversion result output; supports up to 1.4MHz clock rate |
| 2 DIN | Serial data input | Accepts 8-bit control byte (START/RNG/BIP/PD/MODE bits); rising-edge clocked |
| 3 VDD | Positive supply | Single 4.75–5.25V supply; requires local 0.1µF bypass to GND for noise immunity |
| 4 GND | Analog/digital ground | Common reference for analog input, reference, and digital interface; must be low-impedance |
| 5 AIN | Analog input | High-impedance node accepting software-configured voltage ranges; protected to ±12V |
| 6 REF | Reference buffer output / reference input | Provides 4.096V internal reference (bypass with 1µF) or accepts external 2.40–4.18V reference |
| 7 CS | Active-low chip select | Enables serial communication; falling edge initiates control-byte acceptance and conversion start |
| 8 DOUT | Serial data output | Outputs 12-bit conversion result MSB-first on SCLK falling edge; high-impedance when CS = high |
Key Features
| Feature | Design Value |
|---|---|
| Four software-selectable input ranges | Eliminates need for external programmable gain amplifiers (PGAs) in multi-sensor systems |
| ±12V fault-protected analog input | Prevents latch-up or damage during field wiring errors, surge events, or hot-plug conditions |
| AutoShutdown™ between conversions | Reduces average current without sacrificing startup latency - ideal for event-triggered sampling |
| Internal 4.096V reference with ±15ppm/°C tempco (commercial grade) | Enables self-contained, calibrated measurements without external reference ICs |
| Four programmable power-down modes | Supports adaptive power management: immediate/delayed standby or full shutdown based on system duty cycle |
Applications
| Industrial PLC Analog Input Module | Portable Battery-Powered Data Logger |
|---|---|
|
Use Scenario: Digitizing 4–20mA current loop outputs and ±10V sensor signals in modular I/O racks with shared 5V backplane power. IC Role / Device Role / Timing Role: Primary ADC performing multirange, fault-tolerant signal acquisition with SPI interface to host controller. Use Value: ±12V input protection prevents field-induced failures; software-selectable ranges reduce BOM count across module variants. |
Use Scenario: Capturing temperature, pressure, and voltage readings in handheld test equipment powered by two AA cells. IC Role / Device Role / Timing Role: Low-power ADC managing duty-cycled sampling to extend battery life while maintaining 12-bit resolution. Use Value: 1µA full power-down current and AutoShutdown™ enable >1-year battery life at 1-sample-per-second duty cycle. |
| Medical Patient Monitor Front-End | Automated Test Equipment (ATE) Channel Card |
|
Use Scenario: Acquiring biopotential signals (ECG, EEG) and auxiliary analog sensors in Class II medical devices with strict safety isolation requirements. IC Role / Device Role / Timing Role: Isolated-side ADC converting conditioned analog signals before digital isolation barrier. Use Value: ±12V fault tolerance provides margin against transient coupling across isolation barriers; 87ksps supports oversampling for noise reduction. |
Use Scenario: High-channel-count ATE card measuring DC parametrics and low-frequency AC responses across DUTs under test. IC Role / Device Role / Timing Role: Precision ADC providing calibrated voltage/current measurement with minimal external support components. Use Value: Internal 4.096V reference and ±1 LSB INL eliminate need for per-channel calibration, reducing test head complexity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit multirange ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7816U | 8-pin SOIC, 100ksps, no internal reference, no fault protection, requires external REF | Lacks ±12V input protection and integrated reference - needs additional components for same functionality | Choose when board space is constrained and external reference already exists; not drop-in for MAX1272BCPA |
| AD7810BRZ | 10-bit resolution, 125ksps, ±10V input range only, no software-selectable ranges, no fault protection | Lower resolution and fixed input range limit flexibility in mixed-signal sensor systems | Use where cost sensitivity outweighs resolution and configurability needs; requires redesign for range switching |
Compared with ADS7816U and AD7810BRZ, MAX1272BCPA uniquely combines 12-bit no-missing-codes accuracy, ±12V fault protection, software-selectable input ranges, and internal reference in an 8-pin PDIP - making it optimal for ruggedized, low-component-count industrial data acquisition where reliability and design simplicity are critical.
Availability
MAX1272BCPA is available at Aetrix Electronics and suitable for industrial control systems, battery-powered instruments, and medical instrumentation requiring stable component supply across extended temperature and long product lifecycles.
Supply support for MAX1272BCPA 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 MAX1272BCPA belongs to Maxim's fault-protected data-acquisition system (DAS) product line, designed specifically for industrial environments demanding robustness, configurability, and single-supply operation in PLCs, DAQ modules, and field instrumentation.
FAQ
What input voltage ranges does the MAX1272BCPA support?
The MAX1272BCPA supports four software-selectable input ranges: ±10V, ±5V, 0 to 10V, and 0 to 5V. These are configured via the RNG and BIP bits in the 8-bit control byte. The device maintains ±12V fault protection across all ranges, ensuring robustness against overvoltage events regardless of selected scale.
Does the MAX1272BCPA require an external reference?
No - the MAX1272BCPA includes an internally trimmed 4.096V reference with ±15ppm/°C temperature coefficient (commercial grade). It can operate in internal reference mode by setting the REF bit in the control byte to '1'. An external reference (2.40–4.18V) is optional and enabled by clearing the REF bit.
How does the MAX1272BCPA handle power-down modes?
The MAX1272BCPA offers four software-programmable power-down modes: delayed standby, immediate standby, delayed full power-down, and immediate full power-down. These are selected using the PD, MODE1, and MODE0 bits. In all modes, the digital interface remains active and fault protection stays enabled - critical for fail-safe operation in industrial systems.
What is the maximum sampling rate of the MAX1272BCPA?
The MAX1272BCPA achieves a maximum throughput rate of 87ksps (kilo-samples per second) when operated with a 1.4MHz SCLK. This is achieved using 16 clock cycles per conversion (4 for acquisition, 12 for conversion), and is supported across all input ranges and reference configurations.
Is the MAX1272BCPA compatible with standard microcontroller SPI peripherals?
Yes - the MAX1272BCPA implements a SPI/QSPI/MICROWIRE-compatible 3-wire serial interface. It requires CPOL = 0 and CPHA = 0 configuration on the host microcontroller. Data is clocked in on SCLK rising edge (DIN) and out on falling edge (DOUT), with CS controlling frame synchronization - enabling direct connection to most ARM, PIC, and MSP430 MCUs.
MAX1272BCPA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Bulk
- Product Status:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 87k
- Number of Inputs:
- 1
- Input Type:
- Single Ended
- Data Interface:
- Microwire, QSPI, SPI
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- 4.75V ~ 5.25V
- Voltage - Supply, Digital:
- 4.75V ~ 5.25V
- Features:
- Selectable Address
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 8-PDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
MAX1272BCPA FAQ
1.How can I place an order for MAX1272BCPA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1272BCPA 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 MAX1272BCPA reliable?
The price and inventory of MAX1272BCPA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1272BCPA is usually 5 days.
3.What payment methods are accepted for MAX1272BCPA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1272BCPA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1272BCPA?
MAX1272BCPA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1272BCPA 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 MAX1272BCPA?
For technical support, including MAX1272BCPA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1272BCPA requirements.
6.How does Aetrix verify that MAX1272BCPA is sourced from the original manufacturer or authorized distributors?
All MAX1272BCPA 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 MAX1272BCPA meets industry standards.
7.What is the process for return or replacement of MAX1272BCPA?
All MAX1272BCPA units undergo pre-shipment inspection (PSI). If there is an issue with MAX1272BCPA, 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 MAX1272BCPA part is unused and in its original packaging.
Return procedure for MAX1272BCPA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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