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Analog Devices Inc./Maxim Integrated MAX1273BCPA
- Part No.:
- MAX1273BCPA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX1273BCPA.pdf
- Description:
- 12-BIT ADC SELECTABLE INPUT
- Quantity:
- Payment:
- Shipping:
Inventory:583
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Product details
Overview
MAX1273BCPA from Maxim Integrated is a fault-protected, software-programmable 12-bit analog-to-digital converter (ADC) designed for multirange data acquisition in single 5V systems. It supports four input ranges (±VREF, ±VREF/2, 0 to VREF, 0 to VREF/2), delivers 87ksps throughput, features SPI/QSPI/MICROWIRE-compatible 3-wire serial interface, and operates across 0°C to +70°C - ideal for industrial control and battery-powered instrumentation.
For engineers reviewing the MAX1273BCPA datasheet, MAX1273BCPA pinout, MAX1273BCPA application, or MAX1273BCPA equivalent, key selection considerations include its ±6V analog input fault tolerance, internal 4.096V reference with ±15ppm/°C tempco, 12-bit no-missing-codes performance, and support for immediate/delayed standby and full power-down modes to optimize system-level power efficiency.
Technical Context
The MAX1273BCPA employs successive approximation register (SAR) architecture with integrated track/hold (T/H), enabling precise conversion of bipolar and unipolar signals without external signal conditioning. Its resistor-divider input network scales inputs based on software-configured RNG and BIP bits, while overvoltage protection remains active even during power-down.
Conversion timing is fully synchronous to SCLK: acquisition completes after 4 clock cycles, hold/conversion begins on the 8th falling edge, and 12-bit output appears over 12 subsequent SCLK falling edges - supporting deterministic 16-clock-per-conversion operation at up to 1.4MHz clock rate.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR with no missing codes - guarantees monotonicity and full code coverage over temperature. |
| Sampling Rate | 87ksps maximum - enables real-time capture of signals up to ~43.5kHz (Nyquist-limited) with anti-alias filtering. |
| Analog Input Ranges | Software-selectable: ±VREF, ±VREF/2, 0 to VREF, 0 to VREF/2 - eliminates external gain-switching circuitry. |
| Fault Protection | ±6V absolute max on AIN (per Absolute Maximum Ratings) - safeguards against transient overvoltage in industrial environments. |
| Reference Options | Internal 4.096V (±15ppm/°C) or external 2.40V–4.18V - allows precision scaling or integration with system-wide reference sources. |
| Power Consumption | 1.5mA at 87ksps (external ref), 0.4mA at 10ksps, 1µA in full power-down - supports duty-cycled sensing architectures. |
| Serial Interface | SPI/QSPI/MICROWIRE-compatible 3-wire (DIN/DOUT/SCLK), CS-active-low - interoperates directly with common microcontrollers without level shifters or glue logic. |
Pinout & Package
MAX1273BCPA is housed in an 8-pin plastic DIP (PDIP) package with through-hole mounting and 0.3-inch body width. Pin functions are validated per Maxim's official pin description table and schematic symbol.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SCLK | Serial clock input | Controls all timing: acquisition starts on 4th falling edge, conversion on 8th; supports up to 1.4MHz for 87ksps throughput. |
| DIN | Serial data input | Accepts 8-bit control byte (START/RNG/BIP/PD/MODE/REF bits); start bit initiates acquisition sequence. |
| VDD | 5V supply input | Requires 4.75V–5.25V; bypass with 0.1µF capacitor to GND to suppress switching noise affecting ADC accuracy. |
| GND | Analog/digital ground | Single ground plane recommended; separates reference and digital return paths only if layout constraints demand separation. |
| AIN | Analog input channel | High-impedance input (40pF); accepts software-selected ranges; ±6V fault-tolerant per Absolute Maximum Ratings. |
| REF | Reference buffer output / reference input | Configurable via REF bit: outputs 4.096V (internal mode) or accepts 2.40–4.18V (external mode); bypass with 1µF to GND. |
| CS | Active-low chip select | Enables serial communication; falling edge synchronizes control byte; high state places DOUT in high-impedance mode. |
| DOUT | Serial data output | Outputs 12-bit result MSB-first on SCLK falling edge; remains readable during power-down for low-latency readout. |
Key Features
| Feature | Design Value |
|---|---|
| Four software-selectable input ranges | Eliminates external range-switching components and simplifies firmware-driven sensor interfacing for 4–20mA transmitters or bipolar process signals. |
| 12-bit resolution with no missing codes | Ensures guaranteed monotonicity and full-scale linearity across operating temperature (0°C to +70°C), critical for closed-loop control accuracy. |
| Integrated 4.096V internal reference | Provides stable, factory-trimmed reference with ±15ppm/°C tempco (commercial grade), reducing BOM count and board space vs. discrete reference ICs. |
| Four programmable power-down modes | Enables fine-grained energy management: delayed/immediate standby preserves reference buffer; full power-down cuts supply current to 1µA. |
| SPI/QSPI/MICROWIRE-compatible interface | Direct connection to microcontrollers without protocol translation - reduces firmware complexity and eliminates external interface logic. |
Applications
| Industrial Process Monitoring | Battery-Powered Test Equipment |
|---|---|
|
Use Scenario: Continuous voltage/current monitoring of PLC I/O modules and field transmitters in factory automation. IC Role / Device Role / Timing Role: Primary ADC digitizing ±10V, 0–10V, or 4–20mA loop signals with software-configurable range and fault tolerance. Use Value: ±6V input fault protection prevents latch-up during cable ESD events; 87ksps sampling captures transient anomalies without oversampling hardware. |
Use Scenario: Portable handheld multimeters and calibration tools requiring long battery life and high DC accuracy. IC Role / Device Role / Timing Role: Low-power, precision ADC converting sensor outputs in intermittent measurement cycles. Use Value: 1µA full power-down current extends battery runtime; internal 4.096V reference ensures consistent 12-bit scaling without external components. |
| Medical Vital Sign Acquisition | Automated Test Equipment (ATE) |
|
Use Scenario: Analog front-end for patient monitors measuring ECG, respiration, or temperature with isolated signal paths. IC Role / Device Role / Timing Role: Isolated-side ADC capturing low-amplitude biopotentials with programmable gain-equivalent input ranges. Use Value: Software-selectable ±VREF/2 range matches typical amplifier output swing; no-missing-codes linearity ensures diagnostic-grade waveform fidelity. |
Use Scenario: High-speed functional test of mixed-signal PCBs using benchtop ATE platforms with tight timing budgets. IC Role / Device Role / Timing Role: Embedded DAS element performing rapid voltage margining and parametric testing. Use Value: Deterministic 16-clock conversion cycle enables precise timing alignment with test pattern generators; SPI interface simplifies controller integration. |
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 |
|---|---|---|---|
| ADS7822U | 8-pin SOIC, 2.7–5.25V supply, 200ksps, no internal reference, requires external REF. | Lacks fault protection and integrated reference; better suited for low-voltage, high-speed portable designs where board space is constrained. | Choose ADS7822U when higher throughput (200ksps) is required and external reference infrastructure already exists. |
| AD7892BRZ | 14-bit resolution, 5V-only supply, ±10V input range, no software-selectable ranges, 100ksps. | Fixed input range limits flexibility; higher resolution trades off configurability and power efficiency for precision in static measurements. | Choose AD7892BRZ when absolute DC accuracy >12-bit is mandatory and range reconfiguration is unnecessary. |
Compared with ADS7822U and AD7892BRZ, the MAX1273BCPA uniquely combines software-selectable ranges, ±6V fault tolerance, integrated 4.096V reference, and ultra-low 1µA power-down current - making it optimal for adaptable, robust, and energy-conscious industrial DAS implementations.
Availability
MAX1273BCPA is available at Aetrix Electronics and suitable for industrial control systems, battery-powered instruments, and automated test equipment requiring stable component supply, commercial-temperature-grade reliability, and long-term production continuity.
Supply support for MAX1273BCPA 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 MAX1272/MAX1273 product line was engineered to deliver fault-protected, software-configurable data acquisition in compact 5V systems - targeting cost-sensitive, space-constrained industrial and portable instrumentation where flexibility and ruggedness are essential.
FAQ
What input voltage ranges does the MAX1273BCPA support?
The MAX1273BCPA supports four software-selectable analog input ranges: ±VREF, ±VREF/2, 0 to VREF, and 0 to VREF/2. These are configured via the RNG and BIP bits in the 8-bit control byte. Unlike the MAX1272BCPA, the MAX1273BCPA does not support ±10V or 0–10V ranges - its full-scale spans are strictly referenced to the applied or internal VREF value.
Does the MAX1273BCPA include an internal voltage reference?
Yes, the MAX1273BCPA includes a factory-trimmed 4.096V internal reference with ±15ppm/°C temperature coefficient (commercial grade). When enabled via the REF bit in the control byte, this reference drives the REF pin and serves as the ADC's conversion基准. A 1µF capacitor must be placed between REF and GND for stability.
What is the absolute maximum analog input voltage for the MAX1273BCPA?
The absolute maximum analog input voltage for the MAX1273BCPA is ±6V relative to GND, as specified in the Absolute Maximum Ratings table. This fault tolerance applies regardless of selected input range or power state, providing robust protection against transient overvoltage in industrial environments.
How many power-down modes does the MAX1273BCPA offer, and how do they differ?
The MAX1273BCPA offers four software-programmable power-down modes: delayed standby, immediate standby, delayed full power-down, and immediate full power-down. Standby modes retain the internal reference buffer (eliminating wake-up delay), while full power-down disables it. Delayed modes complete the current conversion before entering low-power state; immediate modes halt conversion mid-cycle.
Is the MAX1273BCPA compatible with standard SPI microcontrollers?
Yes, the MAX1273BCPA is fully compatible with SPI, QSPI, and MICROWIRE interfaces. It requires CPOL = 0 and CPHA = 0 configuration on the master controller. Communication uses a 3-wire interface (DIN/DOUT/SCLK) with active-low CS, and outputs 12-bit results MSB-first on SCLK falling edges - matching standard SPI timing conventions without additional logic.
MAX1273BCPA 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:
- -
MAX1273BCPA FAQ
1.How can I place an order for MAX1273BCPA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1273BCPA 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 MAX1273BCPA reliable?
The price and inventory of MAX1273BCPA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1273BCPA is usually 5 days.
3.What payment methods are accepted for MAX1273BCPA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1273BCPA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1273BCPA?
MAX1273BCPA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1273BCPA 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 MAX1273BCPA?
For technical support, including MAX1273BCPA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1273BCPA requirements.
6.How does Aetrix verify that MAX1273BCPA is sourced from the original manufacturer or authorized distributors?
All MAX1273BCPA 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 MAX1273BCPA meets industry standards.
7.What is the process for return or replacement of MAX1273BCPA?
All MAX1273BCPA units undergo pre-shipment inspection (PSI). If there is an issue with MAX1273BCPA, 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 MAX1273BCPA part is unused and in its original packaging.
Return procedure for MAX1273BCPA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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