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Analog Devices Inc./Maxim Integrated MAX6126B21+
- Part No.:
- MAX6126B21+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX6126B21+.pdf
- Description:
- IC VREF SERIES 0.1% 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:2,427
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Product details
Overview
MAX6126B21+ from Maxim Integrated is a precision series voltage reference 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) noise-enabling high-resolution ADC/DAC biasing in automotive-grade test equipment and industrial process controllers.
For engineers reviewing the MAX6126B21+ datasheet, MAX6126B21+ pinout, MAX6126B21+ application, or MAX6126B21+ equivalent, key selection criteria include force/sense output architecture for remote sensing, 200mV dropout at 10mA load, stability with 0.1–10μF capacitive loads, and automotive temperature range compliance.
Technical Context
The MAX6126B21+ employs curvature-corrected bandgap topology with laser-trimmed thin-film resistors to achieve 5ppm/°C tempco over −40°C to +125°C and ±0.06% initial accuracy. Its dual-output (OUTF/OUTS) architecture enables Kelvin sensing to cancel trace resistance errors in precision current sources and high-accuracy metering.
Wideband noise is reduced from 60nV/√Hz to 35nV/√Hz via external 0.1μF capacitor on NR pin; flicker noise remains 1.3μVP-P (0.1Hz–10Hz). Supply current is stable at 380μA (typ) across 2.7–12.6V input, with <0.025Ω effective load regulation up to ±10mA sink/source.
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. |
| Tempco (−40°C to +125°C) | 5ppm/°C max - ensures ≤1.024mV drift over full automotive range, critical for field-deployed instrumentation. |
| Noise (0.1Hz–10Hz) | 1.3μVP-P - enables 20-bit+ effective resolution in low-frequency precision measurement systems. |
| Dropout Voltage | 200mV max at 10mA - supports operation from 2.248V supply, ideal for low-voltage battery-powered sensors. |
| Load Regulation | 0.025Ω max - maintains <25μV error per mA load change, essential for stable current-source compliance. |
| Capacitive Load Stability | 0.1μF to 10μF - accommodates ceramic or tantalum bypassing without oscillation in noisy industrial environments. |
| Supply Current | 380μA typ, <2μA/V variation - minimizes power budget impact in always-on monitoring nodes. |
Pinout & Package
MAX6126B21+ is housed in an 8-pin SO package (SOIC-8), surface-mount, RoHS-compliant, with exposed pad thermal performance optimized for industrial PCB layouts.
| 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; left open if unused. |
| 2 IN | Positive Supply Input | Operates from 2.7V to 12.6V; supplies internal regulator and reference core. |
| 3 GND | Power Ground Reference | Main ground return for internal circuitry; separate from GNDS to isolate sensing path. |
| 4 GNDS | Ground Sense Terminal | Connects to load ground point to cancel ground-path IR drop in Kelvin configurations. |
| 5, 8 I.C. | Internally Connected | No external connection; floating or tied to GND has no functional effect. |
| 6 OUTS | Voltage Sense Output | Feedback node for regulation loop; connects directly to load reference point for precision sensing. |
| 7 OUTF | Voltage Force Output | Delivers regulated current to load; shorted to OUTS near load to enable 4-wire remote sensing. |
Key Features
| Feature | Design Value |
|---|---|
| Force/Sense Output Architecture | Enables true 4-wire remote sensing to eliminate voltage drop errors in long-trace or high-current applications. |
| Ultra-Low Flicker Noise | 1.3μVP-P (0.1Hz–10Hz) supports sub-20ppm measurement repeatability in digital voltmeters and calibration standards. |
| Automotive Temperature Range | Specified from −40°C to +125°C with guaranteed 5ppm/°C tempco - qualified for under-hood and industrial control use. |
| Low Dropout & High Current Drive | 200mV dropout at 10mA allows operation from 3.3V or 5V rails while sourcing/sinking full ±10mA load current. |
| Noise Reduction Pin (NR) | External 0.1μF capacitor cuts wideband noise by >40%, improving SNR in high-speed data acquisition front-ends. |
Applications
| High-Resolution Data Acquisition | Automotive ATE Equipment |
|---|---|
|
Use Scenario: 24-bit sigma-delta ADC front-end in portable calibration instruments requiring <10ppm total error. IC Role / Device Role / Timing Role: Primary voltage reference for ADC VREF input, providing stable 2.048V reference with minimal drift and noise. Use Value: Enables 120dB SNR and <±0.5LSB integral nonlinearity over temperature due to 5ppm/°C tempco and 1.3μVP-P noise. |
Use Scenario: Automated test system powering multiple DUTs with programmable current sources across −40°C to +125°C environmental chambers. IC Role / Device Role / Timing Role: Precision reference for op-amp-based current mirrors driving DUT bias networks. Use Value: Force/sense outputs maintain <0.01% current accuracy despite PCB trace resistance variations up to 100mΩ. |
| Precision Industrial Current Sources | Digital Voltmeters & Calibration Standards |
|
Use Scenario: 4–20mA transmitter module in hazardous-area process transmitters where long cable runs introduce ground potential differences. IC Role / Device Role / Timing Role: Reference element in Howland current source topology, using OUTS/GNDS for local feedback and OUTF for load drive. Use Value: Eliminates 20–50mV ground-loop errors typical in 2-wire transmitters, achieving <0.05% full-scale accuracy over life. |
Use Scenario: Benchtop 6½-digit DVM requiring traceable 2.048V reference with <1ppm/hour stability for NIST-traceable calibration. IC Role / Device Role / Timing Role: Primary reference standard for internal ADC and auto-zero amplifier offset correction. Use Value: 20ppm/1000hr long-term stability and 20ppm thermal hysteresis ensure <0.005% reading drift between calibrations. |
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 tempco, 1.75μVP-P noise, SO-8 package | Higher initial accuracy but higher flicker noise; no force/sense outputs | Preferred when absolute initial tolerance dominates over long-term drift or remote sensing needs |
| REF5020ID | 2.048V, ±0.05% initial accuracy, 3ppm/°C tempco, 1.2μVP-P noise, SO-8 package | Lower noise than MAX6126B21+, but no NR pin or force/sense architecture | Chosen for ultra-low-noise DC measurement where Kelvin sensing is not required |
Compared with ADR4520BRZ and REF5020ID, MAX6126B21+ trades minor initial accuracy for integrated force/sense capability and configurable noise reduction-making it uniquely suited for high-accuracy current sources and remote-sensing applications where trace resistance cannot be ignored.
Availability
MAX6126B21+ is available at Aetrix Electronics and suitable for high-resolution A/D converters, automotive ATE equipment, and precision industrial current sources requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6126B21+ 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 family targets ultra-high-precision voltage references for metrology-grade instrumentation, automotive test systems, and industrial process control where low noise, low tempco, and remote sensing are mandatory.
FAQ
What is the maximum operating temperature range for MAX6126B21+?
The MAX6126B21+ is rated for continuous operation from −40°C to +125°C, fully specified across this automotive-grade temperature range with guaranteed 5ppm/°C temperature coefficient and ±0.06% initial accuracy. Thermal hysteresis is limited to 35ppm in the SO package, ensuring repeatable performance after thermal cycling.
Does MAX6126B21+ require an external resistor like shunt references?
No, MAX6126B21+ is a series-mode voltage reference and does not require an external current-setting resistor. Its quiescent supply current is virtually independent of input voltage (380μA typ, <2μA/V variation), eliminating wasted supply current and simplifying design compared to two-terminal shunt references.
How does the NR pin on MAX6126B21+ reduce noise?
The NR pin on MAX6126B21+ accepts an external 0.1μF capacitor to filter high-frequency noise in the internal reference core. With this capacitor, wideband noise drops from 60nV/√Hz to 35nV/√Hz at 1kHz, and 0.1Hz–10Hz flicker noise improves from 1.3μVP-P to 0.9μVP-P, directly enhancing ADC effective resolution.
Can MAX6126B21+ drive a 10μF output capacitor?
Yes, MAX6126B21+ is stable with output capacitance from 0.1μF to 10μF, including ceramic, tantalum, and electrolytic types. A 10μF capacitor improves transient response for rapidly varying loads, though turn-on settling time increases to 20ms when combined with the NR capacitor.
What is the purpose of separate OUTF and OUTS pins on MAX6126B21+?
The OUTF (force) and OUTS (sense) pins on MAX6126B21+ implement a Kelvin connection to eliminate voltage drop errors in PCB traces or cables. OUTF delivers current to the load, while OUTS feeds back the actual load voltage-enabling <0.01% accuracy even with 100mΩ series resistance in high-precision current sources.
MAX6126B21+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm 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:
- ±0.1%
- Temperature Coefficient:
- 12ppm/°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-uMAX/uSOP
MAX6126B21+ FAQ
1.How can I place an order for MAX6126B21+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6126B21+ 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 MAX6126B21+ reliable?
The price and inventory of MAX6126B21+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6126B21+ is usually 5 days.
3.What payment methods are accepted for MAX6126B21+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6126B21+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6126B21+?
MAX6126B21+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6126B21+ 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 MAX6126B21+?
For technical support, including MAX6126B21+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6126B21+ requirements.
6.How does Aetrix verify that MAX6126B21+ is sourced from the original manufacturer or authorized distributors?
All MAX6126B21+ 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 MAX6126B21+ meets industry standards.
7.What is the process for return or replacement of MAX6126B21+?
All MAX6126B21+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6126B21+, 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 MAX6126B21+ part is unused and in its original packaging.
Return procedure for MAX6126B21+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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