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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:
- VOLTAGE REFERENCE
- Quantity:
- Payment:
- Shipping:
Inventory:2,948
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Product details
Overview
MAX6126BASA21 from Maxim Integrated is an ultra-high-precision, ultra-low-noise series voltage reference delivering 2.048V output with ±0.06% initial accuracy, 5ppm/°C max temperature coefficient (−40°C to +125°C), and 1.3µVP-P (0.1Hz–10Hz) flicker noise - optimized for high-resolution ADC/DAC biasing in automotive-grade industrial instrumentation.
For engineers reviewing the MAX6126BASA21 datasheet, MAX6126BASA21 pinout, MAX6126BASA21 application, or MAX6126BASA21 equivalent, this page provides verified package mapping (8-pin SO), force/sense output architecture, dropout voltage ≤200mV at 10mA, load regulation <25µV/mA, and validated alternatives for precision reference replacement in ATE and process control systems.
Technical Context
The MAX6126BASA21 employs curvature-corrected bandgap topology with laser-trimmed thin-film resistors to achieve 3ppm/°C typical TC over −40°C to +85°C and 5ppm/°C max over full automotive range. Its dual-output (OUTF/OUTS) Kelvin configuration enables remote sensing to cancel trace resistance errors in precision current sources and high-accuracy metering.
It operates as a low-dropout series reference with supply voltage range 2.7V to 12.6V (VOUT + 200mV min), draws 380µA typical quiescent current (≤725µA over temperature), and remains stable with 0.1µF–10µF capacitive loads - supporting both fast settling (20ms with NR capacitor) and low-noise operation (35nV/√Hz wideband noise when 0.1µF added to NR pin).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.048V nominal - precisely matches 12-bit/16-bit DAC LSB scaling and simplifies gain calibration in digital voltmeters. |
| Initial Accuracy | ±0.06% at +25°C - ensures ≤1.25mV absolute error before trimming, reducing post-manufacturing calibration burden. |
| Tempco (−40°C to +125°C) | 5ppm/°C max - guarantees ≤1.02mV drift over full automotive range, meeting 16-bit ADC 1-LSB error budget. |
| Noise (0.1Hz–10Hz) | 1.3µVP-P - minimizes quantization uncertainty in 24-bit sigma-delta ADCs used in precision weigh scales. |
| Dropout Voltage | 200mV max at 10mA - enables operation from 2.25V supply rails, critical for low-voltage battery-powered sensor nodes. |
| Load Regulation | 25µV/mA max - maintains stability under dynamic load steps up to ±10mA, essential for programmable current source designs. |
| Supply Current | 380µA typical - enables always-on reference operation in energy-constrained IoT edge devices without compromising accuracy. |
Pinout & Package
MAX6126BASA21 is housed in an 8-pin SO (Small Outline) package, RoHS-compliant, with exposed pad not electrically connected. Pin 1 marked by beveled corner or dot; pins 5 and 8 are internally connected and must remain unconnected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 NR | Noise Reduction | Accepts 0.1µF capacitor to reduce wideband noise from 60nV/√Hz to 35nV/√Hz; left open for minimal footprint. |
| 2 IN | Positive Supply Input | Accepts 2.7V–12.6V input; supplies internal regulator; requires local 0.1µF bypass to GND per layout best practice. |
| 3 GND | Power Ground | Primary ground return for internal circuitry; must be star-connected to GNDS at load point for Kelvin sensing. |
| 4 GNDS | Ground Sense | Provides Kelvin return path to cancel ground trace IR drop - connect directly to load ground point, not PCB GND plane. |
| 5, 8 I.C. | Internally Connected | No external connection permitted; floating internally; tie to GND or leave unconnected per datasheet instruction. |
| 6 OUTS | Voltage Sense Output | Feedback node for regulation loop - connect to load-side of sense resistor or ADC reference input to eliminate line loss error. |
| 7 OUTF | Voltage Force Output | Delivers regulated 2.048V current to load - route separately from OUTS and short to OUTS near load for optimal accuracy. |
Key Features
| Feature | Design Value |
|---|---|
| Force/Sense Outputs | Enables true 4-wire Kelvin sensing to eliminate up to 50mΩ of PCB trace resistance error in high-accuracy current sources. |
| Ultra-Low Flicker Noise | 1.3µVP-P (0.1Hz–10Hz) supports sub-20-bit effective resolution in precision data acquisition front-ends. |
| Low Dropout Operation | 200mV max dropout at 10mA allows use with LiFePO4 batteries (2.8V–3.6V) while maintaining full accuracy. |
| Stable with Wide CLOAD | Guaranteed stability from 0.1µF to 10µF output capacitance - accommodates ceramic + tantalum hybrid filtering for EMI suppression. |
| Automotive Temperature Range | Specified from −40°C to +125°C - qualified for under-hood sensor modules and engine control unit reference rails. |
Applications
| High-Resolution A/D Converters | ATE Equipment |
|---|---|
Use Scenario: Reference for 24-bit delta-sigma ADC in portable multimeter design operating from single 3.3V rail. IC Role / Device Role / Timing Role: Provides stable 2.048V reference with <1ppm/°C effective drift after calibration, enabling 100ppm measurement repeatability. Use Value: Eliminates need for external trimming; 1.3µVP-P noise ensures no additional quantization floor degradation beyond ADC intrinsic limits. |
Use Scenario: Precision voltage source in automated test system calibrating 16-bit DACs across −40°C to +85°C environmental chamber. IC Role / Device Role / Timing Role: Serves as primary reference standard with 0.06% initial accuracy and 5ppm/°C tempco - traceable to NIST standards via long-term stability spec. Use Value: Reduces annual recalibration frequency by 60% vs. legacy references due to 20ppm/1000hr long-term stability. |
| Precision Current Sources | Digital Voltmeters |
Use Scenario: Bias generator for 4–20mA transmitter using MOSFET output stage and 2.048V reference-based I-to-V conversion. IC Role / Device Role / Timing Role: Delivers force/sense outputs to maintain 0.01% current accuracy despite 2Ω loop wiring resistance and ambient temperature swings. Use Value: Enables direct 4-wire connection eliminating 10mV offset error from PCB traces - meets IEC 61000-4-5 surge immunity requirements. |
Use Scenario: Reference element in handheld 6½-digit DVM with auto-ranging and 100µV resolution on 2V range. IC Role / Device Role / Timing Role: Supplies 2.048V reference to dual-slope integrator; low 1.3µVP-P noise prevents integration error accumulation during 100ms sampling window. Use Value: Achieves 0.002% basic accuracy without ovenized reference, cutting BOM cost by 40% vs. TCXO-based solutions. |
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, ±0.02% initial accuracy, 3ppm/°C max tempco, 0.9µVP-P noise - higher precision but 500µA supply current and no force/sense outputs. | Preferred for metrology-grade lab equipment where lowest noise dominates; unsuitable for remote-sensing current sources. | Select ADR4520BRZ only when 0.02% accuracy and sub-1µV noise are mandatory and Kelvin sensing is unnecessary. |
| REF5020AIDR | 2.048V, ±0.05% initial accuracy, 3ppm/°C max tempco, 1.1µVP-P noise, 450µA supply current - includes enable pin and better PSRR but no NR pin. | Better suited for power-gated systems requiring shutdown mode; lacks noise-reduction capacitor option for wideband optimization. | Choose REF5020AIDR when system-level power sequencing or >80dB PSRR above 10kHz is required, and 0.1µF NR tuning is not needed. |
Compared with ADR4520BRZ and REF5020AIDR, MAX6126BASA21 uniquely combines force/sense architecture, 0.1µF-tunable wideband noise reduction, and automotive-grade tempco in an SO-8 package - making it optimal for embedded industrial current sources and ATE fixtures where layout flexibility and remote sensing are critical.
Availability
MAX6126BASA21 is available at Aetrix Electronics and suitable for high-resolution A/D converters, ATE equipment, and precision current sources requiring stable component supply across automotive and industrial temperature ranges.
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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, automotive, and communications markets.
The MAX6126 product line delivers ultra-precise, low-noise series voltage references targeting high-end data acquisition, automated test, and process control systems where long-term stability and Kelvin sensing are essential.
FAQ
What is the maximum load current supported by MAX6126BASA21?
MAX6126BASA21 supports ±10mA sink/source current while maintaining specified load regulation (<25µV/mA). At 10mA sourcing, dropout voltage remains ≤200mV, ensuring reliable operation even with marginal supply headroom. Exceeding ±10mA may degrade accuracy or trigger thermal shutdown.
Does MAX6126BASA21 require an external resistor like shunt references?
No. MAX6126BASA21 is a series-mode voltage reference and does not require an external current-setting resistor. Its supply current is virtually independent of input voltage (380µA typical), eliminating wasted current and simplifying design versus two-terminal shunt references.
How does the NR (Noise Reduction) pin function on MAX6126BASA21?
The NR pin on MAX6126BASA21 accepts a 0.1µF capacitor to reduce wideband noise from 60nV/√Hz to 35nV/√Hz at 1kHz. This capacitor filters internal noise without increasing quiescent current - a key advantage over traditional low-noise references that trade power for performance.
Can MAX6126BASA21 be used with output capacitance outside the 0.1µF–10µF range?
No. MAX6126BASA21 is only guaranteed stable with 0.1µF to 10µF output capacitance. Values below 0.1µF risk oscillation; values above 10µF increase turn-on settling time beyond 20ms and may cause overshoot. Ceramic X7R or C0G dielectrics are recommended for best phase margin.
What is the purpose of separate OUTF and OUTS pins on MAX6126BASA21?
OUTF delivers regulated current to the load, while OUTS provides the feedback sense point. Connecting them remotely (Kelvin connection) cancels voltage drop across PCB traces or cables - enabling <0.01% current accuracy in 4–20mA transmitters and precision shunt-based measurements.
MAX6126BASA21 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Bulk
- 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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