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Analog Devices Inc./Maxim Integrated MAX873AESA+
- Part No.:
- MAX873AESA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX873AESA+.pdf
- Description:
- IC VREF SERIES 0.06% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:547
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Product details
Overview
The MAX873AESA+ from Maxim Integrated is a precision 2.5V voltage reference IC with ±0.06% initial accuracy, 7ppm/°C max temperature coefficient, and 3.8µVP-P (10Hz–1kHz) output noise-designed for high-resolution data acquisition in portable test equipment and 12-bit ADC/DAC systems.
For engineers reviewing the MAX873AESA+ datasheet, MAX873AESA+ pinout, MAX873AESA+ application, or MAX873AESA+ equivalent, key selection criteria include its low 450µA max quiescent current, ±6% output trim range via TRIM pin, TEMP output for die-temperature monitoring, and guaranteed operation from +4.5V to +18V supply.
Technical Context
The MAX873AESA+ employs a proprietary curvature-corrected bandgap core with laser-trimmed thin-film resistors to achieve 7ppm/°C max drift over –40°C to +85°C. Its internal architecture supports both sourcing (10mA) and sinking (2mA) load currents while maintaining <15ppm/mA load regulation and <4ppm/V line regulation.
It integrates a dedicated TEMP pin delivering 570mV at +25°C with 1.9mV/°C sensitivity-enabling direct die-temperature sensing without external components-and a TRIM pin allowing ±100mV adjustment of the 2.500V nominal output using a single 100kΩ potentiometer.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.500V ±0.06% (±1.5mV) at +25°C - ensures 12-bit DAC/ADC full-scale accuracy without calibration |
| Temp Coefficient | 7ppm/°C max - limits drift to ≤1.75mV over –40°C to +85°C ambient range |
| Quiescent Current | 450µA max - enables >1-year battery life in portable multimeters drawing 10µA average system current |
| Output Noise | 3.8µVP-P (0.1Hz–10Hz), 6.8µVRMS (10Hz–1kHz) - meets SNR requirements for 12-bit systems |
| Load Regulation | 15ppm/mA max (source), 1900ppm/mA max (sink) - maintains stability under dynamic load steps up to 10mA |
| Supply Range | +4.5V to +18V - operates directly from unregulated 5V ±10% rails or higher-voltage industrial supplies |
| TEMP Output | 570mV ±30mV at +25°C, 1.9mV/°C sensitivity - provides calibrated die-temperature signal for compensation circuits |
Pinout & Package
MAX873AESA+ uses an 8-pin SOIC (SO) package (package code S8-4), 3.94mm × 4.90mm footprint, 1.27mm pitch, lead-free (RoHS-compliant).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 8 | I.C. | Internally connected - must remain unconnected on PCB; no external routing |
| 2 | IN | Positive power input - accepts +4.5V to +18V; requires 0.1µF ceramic bypass to GND |
| 3 | TEMP | Digital-temperature proportional analog output - delivers 570mV @ +25°C, 1.9mV/°C slope for compensation or monitoring |
| 4 | GND | Analog ground reference - must be low-impedance star point shared with ADC reference ground |
| 5 | TRIM | Voltage-adjust input - connects to center tap of 100kΩ pot between OUT and GND for ±100mV fine-tuning |
| 6 | OUT | Precision 2.500V reference output - sources up to 10mA, sinks up to 2mA; stable with 0–100µF capacitive loads |
| 7 | N.C. | No internal connection - left floating; no PCB trace or pad required |
Key Features
| Feature | Design Value |
|---|---|
| Low-drift curvature correction | Laser-trimmed BiCMOS bandgap achieves 7ppm/°C max TC without external compensation networks |
| Integrated temperature sensor | TEMP pin provides factory-calibrated 1.9mV/°C analog output - eliminates need for discrete thermal diodes or ICs |
| Trimmable reference output | TRIM pin enables ±6% (±100mV) adjustment of 2.500V output using only one external potentiometer |
| Ultra-low noise performance | 3.8µVP-P (0.1Hz–10Hz) and 6.8µVRMS (10Hz–1kHz) - preserves ENOB in 12-bit SAR and sigma-delta converters |
| Wide supply tolerance | Operates from +4.5V to +18V - compatible with 5V ±10% rails and higher-voltage industrial buses without LDO pre-regulation |
Applications
| Portable Digital Multimeter | 12-Bit Data Acquisition System |
|---|---|
Use Scenario: Handheld DMM requiring stable 2.5V reference for autoranging ADC across battery life and temperature extremes. IC Role / Device Role / Timing Role: Primary voltage reference for 12-bit SAR ADC; TEMP pin feeds microcontroller for auto-calibration offset correction. Use Value: ±0.06% initial accuracy and 7ppm/°C drift ensure <0.5 LSB error over –10°C to +50°C operating range without field recalibration. | Use Scenario: Battery-powered environmental sensor node digitizing thermocouple and RTD signals with 12-bit resolution. IC Role / Device Role / Timing Role: Precision reference for dual-channel simultaneous-sampling ADC; TRIM pin used during production calibration to null board-level gain errors. Use Value: 3.8µVP-P low-frequency noise prevents degradation of effective resolution in DC-coupled sensor measurements. |
| Low-Power Test Instrument | Calibration Equipment Reference |
Use Scenario: Benchtop handheld calibrator generating precise 2.5V outputs for field verification of process transmitters. IC Role / Device Role / Timing Role: Stable reference source for programmable voltage output stage; TEMP pin monitors die temperature to compensate for thermal EMF in output buffer. Use Value: 450µA max quiescent current extends rechargeable Li-ion battery runtime to >8 hours per charge at full functionality. | Use Scenario: Factory calibration station verifying accuracy of 12-bit DACs before shipment using metrology-grade reference. IC Role / Device Role / Timing Role: Traceable reference standard with long-term stability of 50ppm/kh - used as secondary standard against primary lab references. Use Value: ±1.5mV initial tolerance and 7ppm/°C TC meet ISO/IEC 17025 uncertainty budgets for Class II calibration equipment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF02CP | 5V output, ±0.2% initial accuracy, 25ppm/°C TC, no TEMP or TRIM pins | Fixed 5V reference only; lacks temperature sensing and adjustability | Select when 5V output suffices and cost is prioritized over trim capability and thermal monitoring |
| ADR3425ARJZ-R7 | 2.5V output, ±0.12% initial accuracy, 10ppm/°C TC, no TEMP pin, 3.8µVRMS noise | Higher TC and no die-temperature output; same noise floor but no trimming | Choose for space-constrained designs needing 2.5V reference where TEMP functionality is unnecessary |
Compared with REF02CP and ADR3425ARJZ-R7, the MAX873AESA+ uniquely combines 2.5V precision, ±6% trim range, and integrated die-temperature sensing-making it optimal for self-compensating, field-calibratable instrumentation where thermal drift mitigation is critical.
Availability
MAX873AESA+ is available at Aetrix Electronics and suitable for portable digital multimeters, 12-bit data-acquisition systems, and low-power test instruments requiring stable component supply with guaranteed long-term availability.
Supply support for MAX873AESA+ 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 test-equipment applications.
The MAX873AESA+ belongs to Maxim's precision voltage reference product line, engineered specifically for high-accuracy, low-drift, low-noise operation in portable and battery-powered measurement systems.
FAQ
What is the maximum allowable input voltage for the MAX873AESA+?
The MAX873AESA+ has an absolute maximum IN-to-GND rating of +20V. However, functional operation is specified from +4.5V to +18V. Exceeding +18V may cause increased quiescent current or accelerated long-term drift, and operation above +20V risks permanent damage. For reliable 2.5V reference performance, maintain VIN within the +4.5V to +18V range as defined in the electrical characteristics table.
Can the MAX873AESA+ drive a 10µF output capacitor without instability?
Yes, the MAX873AESA+ is explicitly characterized as stable with capacitive loads up to 100µF. The device does not require an output capacitor for stability and remains unconditionally stable even with 10µF or larger ceramic or tantalum capacitors. This allows robust transient response in systems with high-current switching loads or noisy supply environments, as confirmed in the Applications Information section of the datasheet.
How is the TEMP pin calibrated, and what is its accuracy over temperature?
The TEMP pin of the MAX873AESA+ outputs 570mV at +25°C with a nominal sensitivity of 1.9mV/°C. Accuracy is specified as ±30mV at +25°C and follows the linear relationship VTEMP = 570mV + 1.9mV/°C × (TA − 25°C). Self-heating effects are minimal below 1mA load, and the output remains accurate to within ±1.5°C over the full –40°C to +85°C range when used with a high-impedance ADC input.
What is the typical turn-on time for the MAX873AESA+ to settle within 0.1% of 2.500V?
The MAX873AESA+ typically settles to within 0.1% (±2.5mV) of its 2.500V output in 150µs with no output capacitor. When a 1µF output capacitor is used-as recommended for improved transient immunity-the turn-on time increases to approximately 150µs to 200µs, as verified in the Typical Operating Characteristics (TOC37–TOC38). This fast settling supports rapid power cycling in portable instruments.
Does the MAX873AESA+ support both sourcing and sinking load current, and what are the limits?
Yes, the MAX873AESA+ can source up to 10mA and sink up to 2mA while maintaining output accuracy within specification. Load regulation is characterized at ±15ppm/mA (source) and ±1900ppm/mA (sink) over the full temperature range. The device includes short-circuit protection limiting output current to 60mA when shorted to GND and 3mA when shorted to IN-ensuring robustness in fault conditions without external current-limiting circuitry.
MAX873AESA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Active
- Reference Type:
- Series
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- -
- Current - Output:
- 10 mA
- Tolerance:
- ±0.06%
- Temperature Coefficient:
- 7ppm/°C
- Noise - 0.1Hz to 10Hz:
- 3.8µVp-p
- Noise - 10Hz to 10kHz:
- 6.8µVrms
- Voltage - Input:
- 4.5V ~ 18V
- Current - Supply:
- 600µA
- Current - Cathode:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX873AESA+ FAQ
1.How can I place an order for MAX873AESA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX873AESA+ 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 MAX873AESA+ reliable?
The price and inventory of MAX873AESA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX873AESA+ is usually 5 days.
3.What payment methods are accepted for MAX873AESA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX873AESA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX873AESA+?
MAX873AESA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX873AESA+ 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 MAX873AESA+?
For technical support, including MAX873AESA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX873AESA+ requirements.
6.How does Aetrix verify that MAX873AESA+ is sourced from the original manufacturer or authorized distributors?
All MAX873AESA+ 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 MAX873AESA+ meets industry standards.
7.What is the process for return or replacement of MAX873AESA+?
All MAX873AESA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX873AESA+, 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 MAX873AESA+ part is unused and in its original packaging.
Return procedure for MAX873AESA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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