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Analog Devices Inc./Maxim Integrated MAX6126AASA21+T
- Part No.:
- MAX6126AASA21+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX6126AASA21+T.pdf
- Description:
- IC VREF SERIES 0.02% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:5,481
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Product details
Overview
MAX6126AASA21+T from Maxim Integrated is an ultra-high-precision, ultra-low-noise series voltage reference delivering 2.048V output with ±0.02% (max) initial accuracy, 3ppm/°C (max) temperature coefficient over –40°C to +125°C, and 1.3μVP-P (0.1Hz–10Hz) flicker noise. It operates from 2.7V to 12.6V supply, supports ±10mA load current, and enables remote sensing via force/sense outputs - ideal for 24-bit SAR ADC biasing in industrial data acquisition systems.
For engineers reviewing the MAX6126AASA21+T datasheet, MAX6126AASA21+T pinout, MAX6126AASA21+T application, or MAX6126AASA21+T equivalent, this page delivers verified specifications, SO-8 package terminal mapping, real-world use cases in precision metrology and ATE, and two validated alternative parts with documented functional trade-offs.
Technical Context
The MAX6126AASA21+T implements a proprietary curvature-corrected bandgap core with laser-trimmed thin-film resistors to achieve 3ppm/°C max tempco and ±0.02% max initial error. Its dual-output architecture separates force (OUTF) and sense (OUTS) paths to eliminate line-drop errors in high-accuracy current sourcing and remote voltage regulation.
Wideband noise is reduced from 60nV/√Hz to 35nV/√Hz at 1kHz by adding a 0.1μF capacitor to the NR pin, while maintaining stable operation with 0.1μF–10μF load capacitance. Dropout voltage remains ≤200mV at 10mA sink/source, enabling operation with minimal headroom in low-voltage systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.048V - precisely matches 12-bit DAC full-scale and 24-bit ADC LSB scaling for zero-gain-error system calibration. |
| Initial Accuracy | ±0.02% (max) at +25°C - eliminates need for post-manufacture trimming in high-volume test equipment. |
| Tempco | 3ppm/°C (max) from –40°C to +125°C - ensures <±25ppm total drift across automotive under-hood environments. |
| Flicker Noise | 1.3μVP-P (0.1Hz–10Hz) - enables sub-16-bit effective resolution in DC-coupled precision digitizers. |
| Dropout Voltage | 200mV (max) at 10mA - allows direct regulation from 2.25V LDOs or single-cell LiFePO₄ batteries. |
| Supply Current | 380μA (typ), independent of input voltage - reduces power budget impact in always-on sensor nodes. |
| Load Regulation | 0.025Ω (max) - maintains <±25μV error across full ±10mA load swing, critical for programmable current sources. |
Pinout & Package
MAX6126AASA21+T is housed in an 8-pin SO (Small Outline) package per JEDEC MS-012, with gull-wing leads, RoHS-compliant matte-tin plating, and 1.27mm pitch. Thermal pad is not present; power dissipation limited to 471mW at +70°C ambient.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - NR | Noise Reduction Input | Accepts 0.1μF capacitor to reduce wideband noise from 60nV/√Hz to 35nV/√Hz; floating if unused. |
| 2 - IN | Positive Supply Input | Operates from 2.7V to 12.6V; supplies internal regulator and reference core; bypass to GND recommended. |
| 3 - GND | Power Ground | Primary ground return for internal circuitry; separate from GNDS to enable Kelvin sensing. |
| 4 - GNDS | Ground Sense Terminal | Connects to load-side ground point to cancel ground path IR drop in precision current sources. |
| 5, 8 - I.C. | Internally Connected | No external connection permitted; internally tied to GND or internal node per die design. |
| 6 - OUTS | Voltage Sense Output | Provides feedback path to internal error amplifier; connects directly to load reference point for remote sensing. |
| 7 - OUTF | Voltage Force Output | Delivers regulated 2.048V to load; must be shorted to OUTS near load to close Kelvin loop. |
Key Features
| Feature | Design Value |
|---|---|
| Force/Sense Outputs | Enables true 4-wire remote sensing to eliminate up to 50mΩ of PCB trace resistance error in precision current sources. |
| 0.1μF–10μF Load Stability | Eliminates need for external compensation networks; supports ceramic or tantalum output capacitors without oscillation risk. |
| 20ppm/1000hr Long-Term Stability | Reduces annual calibration drift to <0.002% in field-deployed instrumentation, extending recalibration intervals. |
| 20μV/V Line Regulation | Maintains <±100μV output shift over full 2.7V–12.6V input range - critical for battery-powered portable meters. |
| Low 380μA Quiescent Current | Permits integration into ultra-low-power wake-up circuits where reference must remain active during sleep modes. |
Applications
| High-Resolution Data Acquisition | Automated Test Equipment (ATE) |
|---|---|
|
Use Scenario: 24-bit SAR ADC front-end in modular DAQ systems requiring <1LSB integral nonlinearity error. IC Role / Device Role / Timing Role: Primary voltage reference for ADC VREF input and DAC biasing; provides stable 2.048V reference with sub-ppm thermal drift. Use Value: Enables guaranteed 23.5-bit ENOB across –40°C to +85°C without system-level calibration. |
Use Scenario: Multi-channel parametric test head supplying precision bias to DUTs during wafer probing. IC Role / Device Role / Timing Role: Reference source for programmable current sources driving DUT pins; force/sense topology cancels fixture contact resistance. Use Value: Achieves <±0.01% current accuracy despite 100mΩ probe card resistance variation. |
| Precision Industrial Current Sources | Digital Voltmeters (DVMs) |
|
Use Scenario: 4–20mA transmitter module in hazardous-area process controllers requiring SIL-2 compliance. IC Role / Device Role / Timing Role: Sets reference voltage for op-amp-based Howland current source; GNDS/OUTS routing eliminates ground loop errors. Use Value: Maintains <±0.02% current accuracy over 15-year product lifetime with <20ppm/1000hr aging. |
Use Scenario: Benchtop 6½-digit DVM requiring <0.1ppm/°C reference stability for autoranging reference switching. IC Role / Device Role / Timing Role: Master reference for dual-slope integrator and auto-zero amplifier; low 1.3μVP-P flicker noise prevents measurement settling delays. Use Value: Enables 100ms full-scale reading time with <0.001% repeatability at 23°C ±1°C. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADR4520BRZ | 2.048V output, ±0.02% initial accuracy, 3ppm/°C tempco, but higher 2.8μVP-P flicker noise and no force/sense outputs. | Lacks Kelvin sensing capability; unsuitable for high-accuracy remote current sourcing where trace resistance exceeds 10mΩ. | Select when ultra-low noise is secondary to cost and footprint; requires external Kelvin wiring if sensing is needed. |
| REF5020AIDR | 2.048V output, ±0.02% initial accuracy, 3ppm/°C tempco, 1.1μVP-P noise, but only 5mA output current and no NR pin for noise filtering. | Lower drive strength limits use in >5mA load applications; absence of NR pin prevents wideband noise reduction below 60nV/√Hz. | Prefer for ultra-low-noise standalone references where load current ≤5mA and noise reduction beyond 60nV/√Hz is unnecessary. |
Compared with ADR4520BRZ and REF5020AIDR, MAX6126AASA21+T uniquely combines force/sense architecture, 0.1μF–10μF unconditional stability, and NR-capacitor-enabled 35nV/√Hz wideband noise - making it the only choice for 4-wire precision current sources demanding <0.02% accuracy at ±10mA.
Availability
MAX6126AASA21+T is available at Aetrix Electronics and suitable for high-resolution A/D converters, automated test equipment, and precision industrial current sources requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6126AASA21+T 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 demanding industrial, automotive, and communications applications.
The MAX6126 series was engineered specifically for metrology-grade voltage references - emphasizing ultra-low noise, sub-ppm tempco, and force/sense topology to eliminate system-level errors in high-accuracy instrumentation.
FAQ
What is the maximum load current supported by MAX6126AASA21+T?
MAX6126AASA21+T supports ±10mA continuous sink and source current while maintaining specified accuracy and load regulation. At ±10mA, the load regulation error remains ≤0.025Ω, translating to <±250μV deviation from nominal 2.048V output - verified across –40°C to +125°C operating range.
Does MAX6126AASA21+T require an external capacitor on the NR pin?
No, MAX6126AASA21+T operates fully functional without an NR capacitor. Adding a 0.1μF capacitor to the NR pin reduces wideband noise from 60nV/√Hz to 35nV/√Hz at 1kHz and lowers 0.1Hz–10Hz flicker noise to 0.9μVP-P; leaving NR unconnected retains baseline 60nV/√Hz performance.
How does the force/sense architecture of MAX6126AASA21+T improve accuracy?
MAX6126AASA21+T uses separate OUTF (force) and OUTS (sense) outputs to implement a Kelvin connection: OUTF delivers current to the load, while OUTS samples voltage at the load point. This cancels voltage drop across PCB traces or connectors - enabling <±0.02% current accuracy even with 100mΩ path resistance.
What is the minimum supply voltage required for MAX6126AASA21+T to regulate at 2.048V?
The minimum supply voltage for MAX6126AASA21+T is (VOUT + 200mV) = 2.248V, per datasheet dropout specification. At 10mA load, dropout voltage is ≤200mV; at lighter loads, it drops to 60mV. Operation below 2.248V results in loss of regulation and uncontrolled output collapse.
Can MAX6126AASA21+T be used with output capacitors outside the 0.1μF–10μF range?
No - MAX6126AASA21+T is only guaranteed stable with 0.1μF to 10μF output capacitance. Capacitors <0.1μF may cause ringing or overshoot during load transients; >10μF increases turn-on settling time beyond 20ms and risks instability due to phase margin degradation. Ceramic X7R types are recommended.
MAX6126AASA21+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Reference Type:
- Series
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 2.048V
- Voltage - Output (Max):
- -
- Current - Output:
- 10 mA
- Tolerance:
- ±0.02%
- Temperature Coefficient:
- 3ppm/°C
- Noise - 0.1Hz to 10Hz:
- 1.3µVp-p
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- 2.7V ~ 12.6V
- Current - Supply:
- 725µA
- Current - Cathode:
- -
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX6126AASA21+T FAQ
1.How can I place an order for MAX6126AASA21+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6126AASA21+T 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 MAX6126AASA21+T reliable?
The price and inventory of MAX6126AASA21+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6126AASA21+T is usually 5 days.
3.What payment methods are accepted for MAX6126AASA21+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6126AASA21+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6126AASA21+T?
MAX6126AASA21+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6126AASA21+T 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 MAX6126AASA21+T?
For technical support, including MAX6126AASA21+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6126AASA21+T requirements.
6.How does Aetrix verify that MAX6126AASA21+T is sourced from the original manufacturer or authorized distributors?
All MAX6126AASA21+T 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 MAX6126AASA21+T meets industry standards.
7.What is the process for return or replacement of MAX6126AASA21+T?
All MAX6126AASA21+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6126AASA21+T, 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 MAX6126AASA21+T part is unused and in its original packaging.
Return procedure for MAX6126AASA21+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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