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Analog Devices Inc./Maxim Integrated MAX1273EUA+
- Part No.:
- MAX1273EUA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX1273EUA+.pdf
- Description:
- IC ADC 12BIT SAR 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:1,880
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Product details
Overview
The MAX1273EUA+ from Maxim Integrated is a fault-protected, software-programmable 12-bit analog-to-digital converter (ADC) with ±VREF and 0 to VREF/2 input ranges, 87ksps throughput, internal 4.096V reference, and SPI/QSPI/MICROWIRE-compatible 3-wire serial interface - designed for precision data acquisition in industrial sensor interfaces and battery-powered instrumentation.
For engineers reviewing the MAX1273EUA+ datasheet, MAX1273EUA+ pinout, MAX1273EUA+ application, or MAX1273EUA+ equivalent, key selection criteria include its 12-bit no-missing-codes performance, ±1 LSB INL over –40°C to +85°C, software-selectable bipolar/unipolar modes, 1.5mA active supply current at full rate, and 8-pin µMAX package compatibility with space-constrained PCB layouts.
Technical Context
The MAX1273EUA+ implements a successive-approximation register (SAR) architecture with integrated track-and-hold, supporting four programmable input ranges via RNG/BIP control bits. Its analog front-end uses a resistor-divider network optimized for low source impedance (<4Ω) and provides ±6V absolute maximum analog input tolerance.
Conversion timing is clock-synchronized: acquisition begins on the 4th SCLK falling edge after CS assertion and completes in 12 additional clocks, enabling deterministic 87ksps operation at 1.4MHz SCLK. The device maintains SPI/QSPI/MICROWIRE protocol compliance with CPOL=0/CPHA=0 configuration and supports three-byte readout of 12-bit results.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR with no missing codes across temperature |
| Sampling Rate | 87ksps maximum - enables real-time monitoring of fast industrial transients |
| Input Ranges | Software-selectable: ±VREF, ±VREF/2, 0 to VREF, 0 to VREF/2 |
| Reference | Internal 4.096V ±15ppm/°C or external 2.40V–4.18V |
| INL / DNL | ±1 LSB integral nonlinearity; ±1 LSB differential nonlinearity |
| Supply Current | 1.5mA at 87ksps (external ref), 0.2µA in full power-down mode |
| Operating Temp | –40°C to +85°C extended industrial range |
Pinout & Package
MAX1273EUA+ is housed in an 8-pin µMAX® package (2.1mm × 1.6mm, 0.5mm pitch), thermally enhanced for high-density PCBs and compatible with standard reflow profiles including lead-free soldering (RoHS-compliant).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SCLK | Serial clock input | Controls conversion timing and data transfer rate; accepts 0.1–1.4MHz clock |
| DIN | Serial data input | Receives 8-bit control byte (START/RNG/BIP/PD/MODE/REF bits) |
| VDD | 5V supply input | Requires 0.1µF bypass capacitor to GND; operates 4.75–5.25V |
| GND | Analog/digital ground | Single ground plane recommended; separates analog and digital return paths |
| AIN | Analog input | Accepts ±VREF or 0 to VREF/2 ranges; ±6V absolute max rating |
| REF | Reference buffer output/input | Provides 4.096V internal reference or accepts external 2.40–4.18V |
| CS | Active-low chip select | Enables serial interface; falling edge initiates control byte acceptance |
| DOUT | Serial data output | 3-state output; delivers 12-bit result MSB-first on SCLK falling edges |
Key Features
| Feature | Design Value |
|---|---|
| Software-selectable input ranges | Four configurations (±VREF, ±VREF/2, 0–VREF, 0–VREF/2) reduce need for external signal conditioning |
| Integrated reference buffer | 4.096V internal reference with ±15ppm/°C tempco eliminates external voltage reference IC |
| Four power-down modes | Immediate/delayed standby and full power-down enable dynamic current scaling from 1.5mA to 0.2µA |
| Fault protection | ±6V analog input tolerance with active overvoltage circuitry during power-down or VDD=0 |
| SPI/QSPI/MICROWIRE compatibility | 3-wire interface requires no level shifters or glue logic when connecting to common microcontrollers |
Applications
| Industrial Process Monitoring | Battery-Powered Test Equipment |
|---|---|
Use Scenario: Continuous acquisition of 4–20mA loop signals from pressure, flow, and temperature transmitters in PLC I/O modules. IC Role / Device Role / Timing Role: ADC front-end converting conditioned analog sensor outputs into digital values for microcontroller processing. Use Value: Software-selectable 0 to VREF/2 range matches 4–20mA receiver output swing; 12-bit resolution supports <0.1% full-scale accuracy. | Use Scenario: Portable multimeter or handheld oscilloscope requiring low-power, high-accuracy DC voltage measurement. IC Role / Device Role / Timing Role: Primary data converter digitizing input signals with minimal quiescent current draw between measurements. Use Value: 0.2µA full power-down current extends battery life; internal reference eliminates calibration drift from external components. |
| Medical Patient Monitoring | Automated Test Equipment (ATE) |
Use Scenario: Isolated ECG or EEG signal acquisition where low noise and stable gain are critical for diagnostic fidelity. IC Role / Device Role / Timing Role: Precision ADC capturing bio-potential waveforms with programmable bipolar input for AC-coupled inputs. Use Value: ±VREF input range accommodates ±2.048V differential signals; ±1 LSB INL ensures clinical-grade linearity. | Use Scenario: High-speed functional testing of analog circuits using benchtop ATE systems with tight timing budgets. IC Role / Device Role / Timing Role: High-throughput ADC synchronizing with system clock for deterministic sampling of DUT responses. Use Value: 87ksps throughput supports >10kHz signal capture; deterministic 16-clock conversion enables precise trigger alignment. |
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 |
|---|---|---|---|
| ADS7822U | 8-pin SOIC package; 200ksps max rate; no internal reference; requires external REF | Higher speed but lacks integrated reference and fault protection | Select when board space allows SOIC and external reference design is preferred |
| AD7476ARMZ | 8-pin MSOP; 1MSPS rate; 2.7–5.25V supply; no software-selectable ranges | Higher speed and wider supply range, but fixed ±VREF input only | Select for high-speed single-range applications where layout density permits MSOP |
Compared with ADS7822U and AD7476ARMZ, the MAX1273EUA+ uniquely combines software-configurable input ranges, integrated 4.096V reference, ±6V fault tolerance, and µMAX packaging - making it optimal for compact, low-power, multi-sensor industrial and medical DAQ systems where flexibility and robustness are prioritized over raw speed.
Availability
MAX1273EUA+ is available at Aetrix Electronics and suitable for industrial process monitoring, battery-powered test equipment, medical patient monitoring, and automated test equipment requiring stable component supply and long-term production continuity.
Supply support for MAX1273EUA+ 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) designs precision analog, mixed-signal, and power management ICs for industrial, medical, and communications applications.
The MAX1273EUA+ belongs to Maxim's fault-protected multirange ADC product line, engineered specifically for reliable, software-flexible data acquisition in harsh environments with varying sensor signal levels.
FAQ
What input voltage ranges does the MAX1273EUA+ support?
The MAX1273EUA+ supports four software-selectable 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 MAX1272EUA+, the MAX1273EUA+ does not support ±10V or 0–10V ranges - its full-scale spans are referenced strictly to the applied or internal VREF value.
Does the MAX1273EUA+ include an internal voltage reference?
Yes, the MAX1273EUA+ integrates a factory-trimmed 4.096V reference buffer. When the REF bit in the control byte is set to '1', the device enables internal reference mode and outputs 4.096V ±15ppm/°C at the REF pin. A 1.0µF capacitor must be placed from REF to GND for stability. In external reference mode (REF = 0), the same pin accepts 2.40V–4.18V.
What is the absolute maximum analog input voltage for the MAX1273EUA+?
The absolute maximum analog input voltage for the MAX1273EUA+ is ±6V relative to GND, as specified in the Absolute Maximum Ratings table. This is distinct from the MAX1272EUA+, which supports ±12V. Exceeding ±6V may cause permanent damage, even briefly - the device does not provide active overvoltage clamping beyond this limit.
How many power-down modes does the MAX1273EUA+ offer, and how are they selected?
The MAX1273EUA+ offers four software-programmable power-down modes: delayed standby, immediate standby, delayed full power-down, and immediate full power-down. These are selected by setting the PD, MODE1, and MODE0 bits in the control byte per Table 4 of the datasheet. Full power-down reduces supply current to 0.2µA while retaining interface responsiveness.
Is the MAX1273EUA+ pin-compatible with the MAX1272EUA+?
Yes, the MAX1273EUA+ is pin-compatible with the MAX1272EUA+ in the 8-pin µMAX package - identical pinout, footprint, and electrical interface. However, their input range capabilities differ: MAX1272 supports ±10V/0–10V while MAX1273 supports only ±VREF/0–VREF ranges. Firmware must be updated to match the respective range definitions and fault protection limits.
MAX1273EUA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 87k
- Number of Inputs:
- 1
- Input Type:
- Single Ended
- Data Interface:
- 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:
- 5V
- Voltage - Supply, Digital:
- 5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 8-uMAX/uSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX1273EUA+ FAQ
1.How can I place an order for MAX1273EUA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1273EUA+ 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 MAX1273EUA+ reliable?
The price and inventory of MAX1273EUA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1273EUA+ is usually 5 days.
3.What payment methods are accepted for MAX1273EUA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1273EUA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1273EUA+?
MAX1273EUA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1273EUA+ 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 MAX1273EUA+?
For technical support, including MAX1273EUA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1273EUA+ requirements.
6.How does Aetrix verify that MAX1273EUA+ is sourced from the original manufacturer or authorized distributors?
All MAX1273EUA+ 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 MAX1273EUA+ meets industry standards.
7.What is the process for return or replacement of MAX1273EUA+?
All MAX1273EUA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1273EUA+, 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 MAX1273EUA+ part is unused and in its original packaging.
Return procedure for MAX1273EUA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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