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Analog Devices Inc./Maxim Integrated MAX6126AASA21+
- Part No.:
- MAX6126AASA21+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX6126AASA21+.pdf
- Description:
- IC VREF SERIES 0.02% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:478
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Product details
Overview
MAX6126AASA21+ 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 - enabling sub-20-bit stability in high-resolution ADC/DAC systems requiring metrology-grade reference integrity.
For engineers reviewing the MAX6126AASA21+ datasheet, MAX6126AASA21+ pinout, MAX6126AASA21+ application, or MAX6126AASA21+ equivalent, this page delivers verified specifications, force/sense output architecture details, noise-reduction capacitor guidance, automotive-grade thermal hysteresis (20ppm), and validated alternatives for precision current source, ATE, and industrial control designs.
Technical Context
The MAX6126AASA21+ implements a curvature-corrected bandgap core with laser-trimmed thin-film resistors and proprietary low-noise architecture - achieving 60nV/√Hz wideband noise at 1kHz (no NR cap) and reducing it to 35nV/√Hz with 0.1μF on NR pin. Its dual-output topology separates force (OUTF) and sense (OUTS) paths to eliminate line-drop errors in remote-sensing applications.
It operates as a true series-mode reference with dropout as low as 200mV at 10mA load, supply current of 380μA (±2μA/V line sensitivity), and guaranteed stability across 0.1μF–10μF capacitive loads - eliminating external resistor dependencies and supporting direct integration into low-power, high-accuracy analog signal chains.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.048V - precisely matches 12-bit full-scale LSB step (212 = 4096) for seamless integration with SAR and sigma-delta ADCs. |
| Initial Accuracy | ±0.02% max at +25°C - enables single-point calibration in production test without trimming. |
| Tempco | 3ppm/°C max (–40°C to +125°C) - ensures ≤12ppm total drift over full automotive range, critical for unheated sensor front-ends. |
| Low-Frequency Noise | 1.3μVP-P (0.1Hz–10Hz) - supports <20-bit effective resolution in digital voltmeters and precision weigh scales. |
| Dropout Voltage | 200mV max at 10mA - allows operation from 2.248V supply, enabling compatibility with LiFePO4 battery rails and low-voltage microcontrollers. |
| Load Regulation | 0.025Ω max - maintains output stability under ±10mA sourcing/sinking, essential for active current-source topologies. |
| Quiescent Current | 380μA typical - enables always-on reference operation in battery-powered portable instrumentation. |
Pinout & Package
MAX6126AASA21+ is housed in an 8-pin SO (Small Outline) package with exposed pad (RoHS-compliant, lead-free). Pin functions are validated per Maxim's official pin configuration diagram and absolute maximum ratings table.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - NR | Noise Reduction Input | Accepts 0.1μF capacitor to reduce 1kHz 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 reference core and output stage with <2μA/V supply sensitivity. |
| 3 - GND | Power Ground Reference | Common return for internal circuitry; must be connected to system ground plane near device. |
| 4 - GNDS | Ground Sense Terminal | Provides Kelvin connection point for remote ground sensing - cancels PCB trace resistance in precision current sources. |
| 5, 8 - I.C. | Internally Connected | No external connection permitted; internally tied to GND or bias nodes per die design. |
| 6 - OUTS | Voltage Sense Output | High-impedance feedback node regulating OUTF; connects directly to load measurement point for remote sensing. |
| 7 - OUTF | Voltage Force Output | Low-impedance power output driving load; bypassed with 0.1–10μF capacitor to GND for stability. |
Key Features
| Feature | Design Value |
|---|---|
| Force/Sense Output Architecture | Separates OUTF (current delivery) and OUTS (voltage regulation) to eliminate IR drop errors in long-trace or high-current applications. |
| Ultra-Low Flicker Noise | 1.3μVP-P (0.1Hz–10Hz) enables <20-bit ENOB in DC-coupled precision measurement systems without external filtering. |
| Automotive Temperature Range | –40°C to +125°C operation with 5ppm/°C max tempco over full range - qualified for under-hood and industrial control environments. |
| Capacitive Load Stability | Stable with 0.1μF–10μF output capacitance - supports both ceramic (fast settling) and tantalum (low ESR) bypass strategies. |
| Long-Term Stability | 20ppm/1000hr (SO package) - ensures calibration retention over 5+ years in field-deployed test equipment and process controllers. |
Applications
| High-Resolution A/D and D/A Converters | ATE Equipment |
|---|---|
|
Use Scenario: Reference for 24-bit sigma-delta ADC in automated test fixture measuring thermocouple outputs with 0.001°C resolution. IC Role / Device Role / Timing Role: Primary voltage reference establishing absolute scale for analog-to-digital conversion; OUTF/OUTS pair compensates for PCB trace resistance between reference and ADC REF+ pin. Use Value: ±0.02% initial accuracy and 3ppm/°C tempco ensure <±1 LSB error over full temperature range without recalibration. |
Use Scenario: Precision current source in semiconductor parametric tester generating 100μA–10mA stimulus currents with <0.01% accuracy. IC Role / Device Role / Timing Role: Reference element in Howland current pump; GNDS/OUTS enable 4-wire remote sensing at DUT terminals. Use Value: 0.025Ω load regulation and 10mA sink/source capability maintain current accuracy despite varying DUT impedance. |
| High-Accuracy Reference Standard | Precision Current Sources |
|
Use Scenario: Portable calibration standard used to verify handheld multimeters and bench DMMs in metrology labs. IC Role / Device Role / Timing Role: Primary reference source with traceable 2.048V output; low 1.3μVP-P noise prevents measurement uncertainty in 7½-digit instruments. Use Value: 20ppm/1000hr long-term stability reduces annual recalibration frequency and associated downtime costs. |
Use Scenario: Programmable current source in industrial 4–20mA transmitter supplying loop power and sensor excitation. IC Role / Device Role / Timing Role: Stable voltage reference feeding op-amp-based current mirror; OUTF drives MOSFET gate while OUTS closes feedback loop at load. Use Value: Dropout voltage ≤200mV allows operation from 3.3V rail, eliminating need for dedicated 5V supply in compact transmitters. |
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 1.8μVP-P flicker noise and no force/sense outputs. | Lacks Kelvin sensing - unsuitable for remote-load current sources where trace resistance exceeds 10mΩ. | Select when board space is constrained (SOIC-8 vs. SO-8) and remote sensing is not required. |
| REF5020IDR | 2.048V output, ±0.05% initial accuracy, 3ppm/°C tempco, 1.1μVP-P noise, but requires external 10μF output capacitor and has 450μA quiescent current. | Higher supply current and mandatory large output cap limit use in battery-powered portable instruments. | Select when lower cost is prioritized and 0.03% additional initial error is acceptable in non-metrology applications. |
Compared with ADR4520BRZ and REF5020IDR, MAX6126AASA21+ uniquely combines force/sense architecture, lowest flicker noise in its class, and automotive-grade tempco - making it optimal for high-accuracy current sourcing and remote-sensing ADC reference designs where trace resistance compensation and sub-20-bit stability are mandatory.
Availability
MAX6126AASA21+ is available at Aetrix Electronics and suitable for high-resolution data acquisition, automated test equipment, and industrial process control requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for MAX6126AASA21+ 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 targets ultra-high-accuracy voltage reference needs in metrology-grade instrumentation, ATE, and high-end sensor signal conditioning - emphasizing low noise, low tempco, and robust remote-sensing capability.
FAQ
What is the maximum allowable input voltage for MAX6126AASA21+?
The absolute maximum input voltage for MAX6126AASA21+ is +13V, but the guaranteed operating range is 2.7V to 12.6V. Exceeding 12.6V may cause parametric degradation or damage, especially at elevated temperatures. The device's line regulation is specified only within the 2.7V–12.6V range, and supply current remains stable across this window.
Can MAX6126AASA21+ drive a 10μF output capacitor without oscillation?
Yes - MAX6126AASA21+ is explicitly characterized for stable operation with 0.1μF to 10μF output capacitance, including ceramic, tantalum, and aluminum electrolytic types. The datasheet confirms no sustained oscillations across this full range, and typical load transient response (e.g., 0–10mA step) shows <20mV undershoot with 10μF bypassing.
How does the NR pin affect noise performance of MAX6126AASA21+?
Connecting a 0.1μF capacitor to the NR pin of MAX6126AASA21+ reduces 1kHz wideband noise from 60nV/√Hz to 35nV/√Hz and lowers 0.1Hz–10Hz flicker noise from 1.3μVP-P to 0.9μVP-P. This is achieved by filtering internal noise-generating nodes; the capacitor must be placed close to the NR pin with short traces to preserve effectiveness.
Is MAX6126AASA21+ pin-compatible with other MAX6126 variants?
Yes - all MAX6126 variants (including MAX6126AASA21+, MAX6126BASA21+, and MAX6126A21+) share identical 8-pin SO and μMAX pinouts and electrical interfaces. Differences are limited to grade (A/B), output voltage, and package type - allowing direct substitution in layout when matching output voltage and accuracy requirements.
What is the thermal hysteresis specification for MAX6126AASA21+?
MAX6126AASA21+ exhibits 20ppm thermal hysteresis (measured as output voltage change at +25°C before and after cycling from –40°C to +125°C), which is the best-in-class value for the SO package. This low hysteresis ensures repeatable calibration across thermal cycles in field-deployed instrumentation and automotive ECUs.
MAX6126AASA21+ 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:
- ±0.02%
- 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+ FAQ
1.How can I place an order for MAX6126AASA21+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6126AASA21+ 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+ reliable?
The price and inventory of MAX6126AASA21+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6126AASA21+ is usually 5 days.
3.What payment methods are accepted for MAX6126AASA21+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6126AASA21+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6126AASA21+?
MAX6126AASA21+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6126AASA21+ 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+?
For technical support, including MAX6126AASA21+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6126AASA21+ requirements.
6.How does Aetrix verify that MAX6126AASA21+ is sourced from the original manufacturer or authorized distributors?
All MAX6126AASA21+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX6126AASA21+?
All MAX6126AASA21+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6126AASA21+, 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+ part is unused and in its original packaging.
Return procedure for MAX6126AASA21+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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