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Analog Devices Inc./Maxim Integrated MAX1254BEUE+
- Part No.:
- MAX1254BEUE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
MAX1254BEUE+.pdf
- Description:
- IC ADC 12BIT PIPELINED 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,397
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Product details
Overview
MAX1254BEUE+ from Maxim Integrated is a stand-alone, 10-channel (8 external + 2 internal) 12-bit system monitor ADC with integrated 4.096V reference, designed for autonomous voltage and remote diode temperature sensing in industrial and telecom power-supply supervision. It delivers ±1 LSB INL/DNL, ±2.5°C internal temperature accuracy over –40°C to +85°C, and operates from 4.5V to 5.5V supply. Its programmable fault counter, recursive averaging, and interrupt-driven alarm make it ideal for server farm thermal management and remote data logger health monitoring.
For engineers reviewing the MAX1254BEUE+ datasheet, MAX1254BEUE+ pinout, MAX1254BEUE+ application, or MAX1254BEUE+ equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternative parts with documented differences, and supply-chain support details specific to this Grade B, 5V-supply variant in 16-pin TSSOP.
Technical Context
The MAX1254BEUE+ implements a fully differential SAR ADC with on-chip track-and-hold, supporting both single-ended and differential input configurations across eight external channels (AIN0–AIN7) plus internal VDD/temperature sensors. Its autonomous operation relies on configurable upper/lower threshold registers, programmable fault-cycle counting (1–15), and digital averaging (2–128 samples) to suppress noise before alarm triggering.
Conversion timing is mode-dependent: 10.6µs typical for voltage measurements, 46µs for temperature sensing using diode bias current (4–66µA); reference modes include internal 4.096V (Grade B, ±30ppm/°C) or external input. The serial interface uses SPI-compatible 3-wire protocol (SCLK, DIN, DOUT, CS, INT) with push-pull or open-drain interrupt output polarity selection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 0.125°C temperature resolution and 1mV-level voltage granularity at 4.096V reference. |
| INL / DNL | ±1 LSB - ensures monotonicity and <0.025% full-scale linearity error for precise threshold-based fault detection. |
| Temp Accuracy | ±2.5°C (–40°C to +85°C) - enables reliable board-level thermal margining without calibration in telecom base stations. |
| Supply Range | 4.5V to 5.5V - matches standard 5V system rails and avoids level-shifting in legacy industrial backplanes. |
| Ref Voltage | Internal 4.096V (±30ppm/°C) - provides stable scaling for 12-bit conversions without external reference component cost or layout area. |
| Max Throughput | 70ksps (single channel, manual trigger) - supports rapid response to transient overvoltage events in power supply monitoring. |
| Power @ 2ksps | 190µA - enables multi-year battery life in remote data loggers with periodic wake-up sampling. |
Pinout & Package
MAX1254BEUE+ is housed in a 16-pin TSSOP (4.4mm × 5.0mm, 0.65mm pitch) with exposed pad for thermal enhancement. Pin 1 marked via dot; recommended PCB footprint per Maxim AN5012.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN0–AIN7 | Configurable analog input pair terminals | Support single-ended voltage sensing or differential remote diode temperature measurement (e.g., AIN0+/AIN1− for MMBT3904 sensor). |
| REF | Reference voltage terminal | Left open when using internal 4.096V reference; requires 0.1µF bypass to GND if external reference applied. |
| INT | Active-low interrupt output | Push-pull or open-drain configurable; asserts when any monitored channel exceeds programmed thresholds after fault-cycle count. |
| DOUT / DIN / SCLK / CS | 3-wire SPI-compatible serial interface | Enables register read/write without CPU intervention; CS high places DOUT in high-impedance state for bus sharing. |
| VDD / GND | Power and ground terminals | VDD accepts 4.5V–5.5V; GND pin (Pin 12) must be low-inductance connection to minimize switching noise coupling into analog inputs. |
Key Features
| Feature | Design Value |
|---|---|
| Stand-alone monitoring | Autonomous scan sequencing and alarm generation eliminate microcontroller polling overhead in headless systems. |
| Programmable fault counter | Prevents false alarms by requiring 1–15 consecutive out-of-limit readings before asserting INT-critical for noisy industrial environments. |
| Digital averaging filter | Configurable 2–128-sample averaging reduces effective noise floor by up to 10dB, improving reliability of low-amplitude sensor signals. |
| Remote diode sensing | Integrated 4–66µA bias current source enables direct connection to discrete NPN/PNP transistors (e.g., MMBT3904) up to 10m cable length. |
| AutoShutdown™ | Reduces IDD to 190µA at 2ksps and <8µA at 50sps-enables energy-proportional sampling in battery-powered telemetry nodes. |
Applications
| Server Power Rail Monitoring | Telecom Remote Site Supervision |
|---|---|
Use Scenario: Real-time tracking of +12V, +5V, +3.3V, and +1.8V rails across dual-CPU server motherboards with hot-swap capability. IC Role / Device Role / Timing Role: Stand-alone ADC performs autonomous 10-channel scan every 100ms; triggers INT on VDD deviation >±3%. Use Value: Eliminates need for host CPU polling, reducing firmware complexity and enabling faster fault isolation during brownout events. |
Use Scenario: Unattended thermal and voltage health monitoring of DSLAM line cards deployed in outdoor cabinets with wide ambient swings. IC Role / Device Role / Timing Role: Measures internal die temperature and four external remote diodes (per card) while logging VDD/2 for supply integrity. Use Value: ±2.5°C accuracy ensures predictive fan control within thermal safety margins; 16-TSSOP fits dense card layouts. |
| Industrial PLC I/O Module | Battery-Powered Environmental Logger |
Use Scenario: Condition monitoring of 8 analog sensor inputs (pressure, vibration, current shunts) in modular PLC backplanes with 24V DC supply. IC Role / Device Role / Timing Role: Configured for single-ended voltage inputs with 16-sample averaging; scans all channels every 500ms. Use Value: ±1 LSB linearity guarantees repeatability across module batches; 4.5–5.5V operation interfaces directly with isolated 5V DC-DC outputs. |
Use Scenario: Multi-year deployment in solar-powered weather stations measuring ambient temperature, battery voltage, and panel output. IC Role / Device Role / Timing Role: Enters AutoShutdown between 10-minute sampling intervals; uses internal temp sensor + external diode for dual-point validation. Use Value: 8µA standby current extends lithium-thionyl chloride battery life beyond 5 years; TSSOP package withstands thermal cycling in field enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar system-monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX1254AEUE+ | Same 16-TSSOP package and pinout; tighter ±1.0°C internal temp accuracy and ±8ppm/°C reference drift vs. MAX1254BEUE+'s ±2.5°C/±30ppm/°C. | Better suited for precision thermal control loops where <±1.5°C error budget is required (e.g., medical equipment). | Select MAX1254AEUE+ when higher temperature accuracy justifies premium cost; MAX1254BEUE+ remains optimal for cost-sensitive telecom infrastructure. |
| ADS7953IRHBT | 12-bit, 16-channel SAR ADC from TI; requires external reference and microcontroller for sequencing; no integrated temp sensor or autonomous alarm logic. | Demands full firmware implementation of threshold checking, averaging, and interrupt generation-increasing BOM and development time. | Choose ADS7953IRHBT only when >10 analog inputs are needed and host processor resources are available for real-time monitoring tasks. |
Compared with MAX1254AEUE+, the MAX1254BEUE+ trades ±1.5°C temperature accuracy and ±22ppm/°C reference stability for lower unit cost and qualification in high-volume telecom deployments; versus ADS7953IRHBT, it delivers complete autonomous monitoring functionality in a single chip with no software overhead.
Availability
MAX1254BEUE+ is available at Aetrix Electronics and suitable for server farms, remote telecom networks, and industrial PLC modules requiring stable component supply with guaranteed long-term manufacturability.
Supply support for MAX1254BEUE+ 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 and mixed-signal ICs for demanding industrial, automotive, and communications applications, with emphasis on integration, low power, and reliability.
The MAX1253/MAX1254 product line targets autonomous system-level monitoring-replacing discrete ADCs, references, comparators, and microcontrollers with a single IC that reduces board space, firmware burden, and supply-chain complexity.
FAQ
What is the operating temperature range for the MAX1254BEUE+?
The MAX1254BEUE+ is specified for continuous operation from –40°C to +85°C ambient temperature. This range is validated across all electrical parameters including ±2.5°C internal temperature sensor accuracy, 4.5V–5.5V supply operation, and 12-bit conversion linearity-making it suitable for uncontrolled environments like outdoor telecom cabinets and factory-floor PLCs.
Does the MAX1254BEUE+ require an external reference voltage?
No, the MAX1254BEUE+ integrates a precision 4.096V internal reference with ±30ppm/°C temperature coefficient. REF pin must be left open when using this internal reference; connecting an external reference requires bypassing REF to GND with a 0.1µF capacitor and disables the internal reference circuitry.
How does the MAX1254BEUE+ handle remote temperature sensing?
The MAX1254BEUE+ provides programmable bias current (4–66µA) on AIN0–AIN7 pairs to drive external diode-connected transistors (e.g., MMBT3904). It measures temperature by digitizing two sequential voltage drops across the diode, achieving ±5°C accuracy in differential mode over 10m cable runs-enabling thermal monitoring of distant components without local signal conditioning.
Can the MAX1254BEUE+ monitor its own supply voltage?
Yes, the MAX1254BEUE+ includes a dedicated internal VDD monitor channel that continuously digitizes the supply rail (4.5V–5.5V) and compares it against user-programmed upper/lower thresholds. This function operates autonomously and triggers the INT pin independently of external channel alarms-providing fail-safe power-good detection in mission-critical systems.
What serial interface protocol does the MAX1254BEUE+ use?
The MAX1254BEUE+ implements a 3-wire SPI-compatible interface with pins CS, SCLK, DIN, and DOUT. It supports standard SPI read/write operations at up to 10MHz clock rate, with data latched on SCLK rising edge (DIN) and output on falling edge (DOUT). CS high places DOUT in high-impedance state for multi-device bus sharing.
MAX1254BEUE+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 94k
- Number of Inputs:
- 8
- Input Type:
- Differential, Single Ended
- Data Interface:
- SPI
- Configuration:
- MUX-S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- Pipelined
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- 5V
- Voltage - Supply, Digital:
- 5V
- Features:
- Temperature Sensor
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 16-TSSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX1254BEUE+ FAQ
1.How can I place an order for MAX1254BEUE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1254BEUE+ 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 MAX1254BEUE+ reliable?
The price and inventory of MAX1254BEUE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1254BEUE+ is usually 5 days.
3.What payment methods are accepted for MAX1254BEUE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1254BEUE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1254BEUE+?
MAX1254BEUE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1254BEUE+ 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 MAX1254BEUE+?
For technical support, including MAX1254BEUE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1254BEUE+ requirements.
6.How does Aetrix verify that MAX1254BEUE+ is sourced from the original manufacturer or authorized distributors?
All MAX1254BEUE+ 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 MAX1254BEUE+ meets industry standards.
7.What is the process for return or replacement of MAX1254BEUE+?
All MAX1254BEUE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1254BEUE+, 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 MAX1254BEUE+ part is unused and in its original packaging.
Return procedure for MAX1254BEUE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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