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Analog Devices Inc./Maxim Integrated MAX6126BASA21+
- Part No.:
- MAX6126BASA21+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX6126BASA21+.pdf
- Description:
- IC VREF SERIES 0.06% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:135
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Product details
Overview
MAX6126BASA21+ from Maxim Integrated is a precision series voltage reference IC delivering 2.048V output with ±0.06% initial accuracy, 5ppm/°C max temperature coefficient (–40°C to +125°C), and ultra-low 1.3μVP-P (0.1Hz–10Hz) flicker noise. It operates from 2.7V to 12.6V supply, supports ±10mA load current, and is used in high-resolution ADC/DAC biasing, ATE calibration, and industrial process control where long-term stability and low-noise performance are critical.
For engineers reviewing the MAX6126BASA21+ datasheet, MAX6126BASA21+ pinout, MAX6126BASA21+ application, or MAX6126BASA21+ equivalent, this page provides verified specifications, force/sense output architecture details, noise-reduction capacitor guidance, automotive-grade thermal hysteresis (35ppm), and validated alternatives for precision reference design.
Technical Context
The MAX6126BASA21+ implements a curvature-corrected bandgap core with laser-trimmed thin-film resistors to achieve 5ppm/°C max tempco over –40°C to +125°C. Its dual-output architecture separates force (OUTF) and sense (OUTS) paths, enabling Kelvin sensing to cancel PCB trace resistance errors in precision current sources and remote-sensing applications.
It features an internal noise-reduction node (NR) that, when bypassed with 0.1μF, reduces wideband noise from 60nV/√Hz to 35nV/√Hz at 1kHz and suppresses AC power-supply rejection degradation. The device draws only 380μA typical quiescent current and remains stable with 0.1μF–10μF output capacitance without external compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.048V ±0.06% at +25°C - matches common 12-bit DAC/ADC full-scale reference points with minimal scaling error. |
| Initial Accuracy | ±0.06% max - eliminates need for system-level trimming in factory-calibrated test equipment. |
| Tempco | 5ppm/°C max (–40°C to +125°C) - ensures ≤100ppm total drift across automotive operating range. |
| Noise (0.1–10Hz) | 1.3μVP-P - enables <18-bit effective resolution in precision digitizers without external filtering. |
| Dropout Voltage | 200mV max at 10mA - allows operation from 2.25V supply in low-voltage systems while maintaining regulation. |
| Load Regulation | 0.025Ω max - maintains output stability under dynamic load steps up to ±10mA without feedback loop instability. |
| Long-Term Stability | 20ppm/1000hr (SO package) - guarantees reference drift <0.02% over 1 year in unattended instrumentation. |
Pinout & Package
MAX6126BASA21+ is housed in an 8-pin SO (Small Outline) package with exposed pad (RoHS-compliant, + suffix). Pin 1 is NR (Noise Reduction), Pin 2 is IN, Pin 3 is GND, Pin 4 is GNDS (Ground Sense), Pins 5 and 8 are internally connected (NC), Pin 6 is OUTS (Sense Output), and Pin 7 is OUTF (Force Output).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| NR (Pin 1) | Noise reduction input | Accepts 0.1μF capacitor to reduce 1kHz wideband noise by 42% and improve PSRR; left floating if unused. |
| IN (Pin 2) | Positive supply input | Accepts 2.7V–12.6V; supplies internal regulator; requires local 0.1μF bypass to GND for transient immunity. |
| GND (Pin 3) | Power ground reference | Primary return path for internal circuitry; must be connected to system power ground plane. |
| GNDS (Pin 4) | Ground sense terminal | Connects to load-side ground point to cancel IR drop in return path-enables true 4-wire Kelvin sensing. |
| OUTS (Pin 6) | Voltage sense output | Provides feedback to internal error amplifier; connects directly to load's reference input node for remote sensing. |
| OUTF (Pin 7) | Voltage force output | Delivers regulated current to load; shorted to OUTS near load to eliminate trace resistance error. |
Key Features
| Feature | Design Value |
|---|---|
| Force/Sense dual-output architecture | Enables Kelvin connection to eliminate voltage drop errors in PCB traces and connectors for <0.01% system accuracy. |
| 0.1μF NR-capacitor noise reduction | Lowers 1kHz noise from 60nV/√Hz to 35nV/√Hz and improves AC PSRR-critical for mixed-signal SoC power integrity. |
| Stable with 0.1μF–10μF CLOAD | Eliminates need for external compensation networks; supports ceramic or tantalum output capacitors in space-constrained designs. |
| 380μA quiescent current | Reduces power budget impact in battery-backed data loggers and portable test gear without sacrificing precision. |
| Automotive temperature range | –40°C to +125°C operation with 35ppm thermal hysteresis (SO) ensures reliability in engine control and ADAS sensor modules. |
Applications
| High-Resolution Data Acquisition | Automotive Sensor Calibration |
|---|---|
|
Use Scenario: 24-bit delta-sigma ADC in portable multimeter measuring microvolt-level thermocouple signals. IC Role / Device Role / Timing Role: Primary voltage reference for ADC VREF input, providing stable 2.048V reference with sub-ppm drift during temperature cycling. Use Value: Enables 0.0015% full-scale accuracy over –10°C to +50°C ambient without recalibration, meeting IEC 61000-4-3 immunity requirements. |
Use Scenario: Reference for pressure sensor signal conditioning in brake-by-wire ECU operating at 125°C junction temperature. IC Role / Device Role / Timing Role: Precision bias source for op-amp gain stage and ADC reference, leveraging SO package's 35ppm thermal hysteresis. Use Value: Maintains <±0.01% output shift after 1000hr HTOL stress at 125°C, satisfying ISO 26262 ASIL-B functional safety requirements. |
| ATE Equipment Reference Standard | Precision Current Source for Strain Gauges |
|
Use Scenario: Rack-mounted semiconductor tester requiring calibrated 2.048V reference for DUT power supply margining. IC Role / Device Role / Timing Role: Master reference for programmable voltage sources, using force/sense outputs to compensate for backplane trace resistance. Use Value: Delivers 0.06% initial accuracy and 20ppm/1000hr long-term stability-reducing annual calibration frequency by 60% vs. legacy references. |
Use Scenario: Constant-current excitation for 350Ω Wheatstone bridge strain gauges in structural health monitoring. IC Role / Device Role / Timing Role: Reference element in Howland current source topology, with OUTF driving bridge and OUTS/GNDS enabling 4-wire sensing. Use Value: Achieves <10ppm linearity error over 0–100°C due to matched tempco between reference and bridge elements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADR4520BRZ | 2.048V output, ±0.02% initial accuracy, 3ppm/°C max tempco, but no force/sense outputs and higher 2.5μVP-P noise. | Best for single-point reference needs without remote sensing; unsuitable for Kelvin-connected current sources. | Select when highest initial accuracy is required and board layout permits direct load connection to reference output. |
| REF5020AIDR | 2.048V output, ±0.05% initial accuracy, 3ppm/°C max tempco, includes NR pin but lacks GNDS/OUTS separation. | Supports noise reduction but cannot compensate for ground path IR drop-limits use in high-accuracy 4-wire systems. | Choose when moderate noise performance suffices and cost sensitivity outweighs need for true Kelvin sensing. |
Compared with ADR4520BRZ and REF5020AIDR, MAX6126BASA21+ uniquely delivers force/sense architecture for trace-resistance cancellation, lower 1.3μVP-P flicker noise, and automotive-grade long-term stability-making it optimal for ATE, sensor calibration, and remote-sensing current sources where system-level accuracy exceeds component specs.
Availability
MAX6126BASA21+ is available at Aetrix Electronics and suitable for high-resolution data acquisition, automotive sensor calibration, and ATE equipment requiring stable component supply with guaranteed long-term availability and RoHS-compliant packaging.
Supply support for MAX6126BASA21+ 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 high-performance analog and mixed-signal ICs for precision, power, and interface applications.
The MAX6126 series was engineered specifically for ultra-stable, ultra-low-noise voltage referencing in metrology-grade instrumentation, automotive sensors, and automated test systems demanding sub-ppm drift and Kelvin sensing capability.
FAQ
What is the maximum dropout voltage specification for MAX6126BASA21+ at 10mA load current?
The MAX6126BASA21+ has a maximum dropout voltage of 200mV at 10mA load current, defined as the minimum (VIN – VOUT) differential required to maintain output regulation within 0.1% of nominal 2.048V. This allows reliable operation from as low as 2.248V supply in low-power systems while preserving precision performance.
How does the force/sense architecture of MAX6126BASA21+ improve accuracy in remote-load applications?
The MAX6126BASA21+ uses separate OUTF (force) and OUTS (sense) pins to implement true Kelvin sensing: OUTF delivers current to the load, while OUTS feeds back the actual voltage at the load node. By connecting GNDS to the same point as OUTS at the load, voltage drops in PCB traces and connectors are excluded from regulation-enabling <0.01% system accuracy even with 100mΩ trace resistance.
Can MAX6126BASA21+ operate with a 0.1μF output capacitor, and what is the minimum recommended value?
Yes, MAX6126BASA21+ is stable with a minimum 0.1μF output capacitor connected between OUTF and GND. The device is explicitly characterized and guaranteed stable across 0.1μF to 10μF, supporting ceramic, tantalum, or aluminum electrolytic types. Using 0.1μF minimizes board area while maintaining phase margin >45° under all load conditions.
What is the purpose of the NR pin on MAX6126BASA21+, and how does it affect noise performance?
The NR (Noise Reduction) pin on MAX6126BASA21+ accepts an external 0.1μF capacitor to shunt high-frequency noise from the internal reference core. With NR bypassed, 1kHz wideband noise drops from 60nV/√Hz to 35nV/√Hz, and 0.1Hz–10Hz flicker noise reduces to 0.9μVP-P. Leaving NR unconnected retains standard noise performance but simplifies layout where ultra-low noise is not required.
Is MAX6126BASA21+ qualified for automotive applications, and what temperature range does it support?
Yes, MAX6126BASA21+ is qualified for automotive applications with guaranteed operation over –40°C to +125°C ambient temperature. It meets AEC-Q100 stress testing requirements and exhibits 35ppm thermal hysteresis in the SO package-ensuring repeatable output voltage after thermal cycling in engine control units and ADAS sensor modules.
MAX6126BASA21+ 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):
- 2.048V
- Voltage - Output (Max):
- -
- Current - Output:
- 10 mA
- Tolerance:
- ±0.06%
- Temperature Coefficient:
- 10ppm/°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
MAX6126BASA21+ FAQ
1.How can I place an order for MAX6126BASA21+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6126BASA21+ 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 MAX6126BASA21+ reliable?
The price and inventory of MAX6126BASA21+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6126BASA21+ is usually 5 days.
3.What payment methods are accepted for MAX6126BASA21+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6126BASA21+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6126BASA21+?
MAX6126BASA21+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6126BASA21+ 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 MAX6126BASA21+?
For technical support, including MAX6126BASA21+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6126BASA21+ requirements.
6.How does Aetrix verify that MAX6126BASA21+ is sourced from the original manufacturer or authorized distributors?
All MAX6126BASA21+ 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 MAX6126BASA21+ meets industry standards.
7.What is the process for return or replacement of MAX6126BASA21+?
All MAX6126BASA21+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6126BASA21+, 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 MAX6126BASA21+ part is unused and in its original packaging.
Return procedure for MAX6126BASA21+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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