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Analog Devices Inc./Maxim Integrated MAX6225AEPA+
- Part No.:
- MAX6225AEPA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX6225AEPA+.pdf
- Description:
- IC VREF SERIES 0.04% 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,657
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Product details
Overview
The MAX6225AEPA+ from Maxim Integrated is a precision 2.500V buried-zener voltage reference with ±0.02% initial accuracy, 3.0ppm/°C max temperature coefficient over –40°C to +85°C, and 1.5µVP-P (0.1Hz–10Hz) output noise - designed for high-resolution ADC/DAC biasing in test equipment and industrial control systems.
For engineers reviewing the MAX6225AEPA+ datasheet, MAX6225AEPA+ pinout, MAX6225AEPA+ application, or MAX6225AEPA+ equivalent, key selection criteria include guaranteed ±15mA sourcing/sinking capability, optional external trim (±15mV range), noise-reduction capacitor support, and stability across 0–100µF capacitive loads without oscillation.
Technical Context
This device uses buried-zener core technology with low-power curvature-compensation circuitry to achieve near-zero thermal hysteresis (20ppm) and flat temperature drift - enabling lab-grade stability without ovenized power consumption. Its internal architecture supports simultaneous line regulation (≤7ppm/V at 10–36V input) and load regulation (≤7ppm/mA sourcing, ≤7ppm/mA sinking) across full temperature range.
Transient response is optimized for dynamic systems: turn-on settling to ±0.01% occurs in 5µs, and load-step recovery (±10mA) exhibits <500µV overshoot with 2µs settling - critical for multiplexed data acquisition where reference settling directly limits channel throughput.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.500V ±1mV at +25°C - enables direct interface with 2.5V full-scale 16-bit SAR ADCs without gain calibration. |
| Tempco (Max) | 3.0ppm/°C (–40°C to +85°C) - ensures ≤±125ppm (±0.313mV) total drift over industrial temperature range. |
| Noise (0.1–10Hz) | 1.5µVP-P - contributes <0.001 LSB error in 16-bit (2.5V range) systems with effective resolution >18 bits. |
| Load Current Range | ±15mA - supports driving 66Ω loads (e.g., op-amp buffers, DAC reference inputs) without external amplification. |
| Line Regulation | ≤7ppm/V (10–36V input) - maintains output stability despite unregulated supply ripple in ATE power rails. |
| Long-Term Stability | 20ppm/1000h - guarantees ≤±0.05% output drift over 1 year of continuous operation in metrology instruments. |
| Supply Current | 2.7mA typical - enables low-power portable calibrators with battery life >100 hours at 9V supply. |
Pinout & Package
MAX6225AEPA+ is housed in an 8-pin plastic DIP package (0.300" wide), RoHS-compliant with lead-free finish (+ suffix). Pin 1, 7, and 8 are internally connected and must remain unconnected in PCB layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 2 (IN) | Positive Power-Supply Input | Accepts 8–36V DC; internal regulator rejects input ripple up to 80dB @ 1kHz when NR capacitor used. |
| 3 (NR) | Noise Reduction Terminal | Connects to 1µF capacitor to ground to reduce wideband noise by 20–30%; open-circuit if unused. |
| 4 (GND) | Analog Ground Reference | Must be star-connected to system AGND; separates reference return from digital or power ground currents. |
| 5 (TRIM) | External Voltage Adjustment | Accepts potentiometer wiper to enable ±15mV (±0.6%) fine-tuning without degrading tempco performance. |
| 6 (OUT) | Precision Reference Output | Delivers 2.500V with <20Ω output impedance @ 10kHz; stable with 0–100µF capacitive loads. |
Key Features
| Feature | Design Value |
|---|---|
| Buried-zener core | Enables 1.5µVP-P ultra-low noise and 20ppm/1000h long-term stability - superior to bandgap references in metrology. |
| Optional NR capacitor | 1µF on NR pin reduces integrated noise by 40% in 10Hz–100kHz band - eliminates need for post-regulator filtering. |
| ±15mA drive capability | Directly sources/sinks current for op-amp buffers, DAC references, or current-source biasing - avoids external transistors. |
| Industry-standard pinout | Pin-compatible with legacy REF02/REF03 families - allows drop-in replacement in existing DIP-8 layouts. |
| Stable with all capacitive loads | Operates without oscillation from 0µF to 100µF output capacitance - simplifies layout for noisy industrial environments. |
Applications
| High-Resolution Data Acquisition | Digital Voltmeters (DVMs) |
|---|---|
|
Use Scenario: 16-bit simultaneous-sampling ADC module in automated test equipment measuring sensor outputs with 100µV resolution. IC Role / Device Role / Timing Role: Primary voltage reference for ADC analog front-end, establishing absolute measurement scale independent of supply variations. Use Value: 3.0ppm/°C tempco and 1.5µVP-P noise ensure <0.005% measurement uncertainty across –40°C to +85°C ambient - meeting Class A DMM specifications. |
Use Scenario: Portable handheld DVM requiring 5½-digit accuracy and battery-powered operation for field calibration. IC Role / Device Role / Timing Role: Stable 2.500V reference for dual-slope integrator and ADC reference ladder. Use Value: 2.7mA supply current and ±15mA drive allow direct connection to integrator op-amp without buffer - extending battery life while maintaining 0.002% basic accuracy. |
| Precision Industrial Current Sources | ATE Equipment Reference Subsystem |
|
Use Scenario: 4–20mA transmitter module generating loop current with ±0.1% full-scale accuracy over temperature. IC Role / Device Role / Timing Role: Reference for current-setting DAC and sense-resistor amplifier feedback path. Use Value: Load regulation of ≤7ppm/mA ensures current accuracy remains unaffected by varying loop impedance - eliminating recalibration during field deployment. |
Use Scenario: Modular ATE slot card providing programmable reference voltages to multiple DUT interfaces simultaneously. IC Role / Device Role / Timing Role: Master reference for voltage-controlled current sources, comparator thresholds, and DAC calibration. Use Value: Turn-on settling in 5µs and transient recovery in <2µs enable reference switching between DUT tests at >100kHz rate - maximizing test throughput. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADR441BRZ | 2.5V output, 3ppm/°C max tempco, but higher 3.5µVP-P noise and only ±10mA drive. | Less suitable for 16-bit+ systems requiring sub-LSB noise floor; requires external buffer for >10mA loads. | Select when lower cost and SOIC-8 footprint are prioritized over ultra-low noise. |
| REF5025AIDR | 2.5V output, 3ppm/°C max tempco, 1.8µVP-P noise, but 100µA max quiescent current vs. 2.7mA. | Optimized for ultra-low-power battery devices; lacks ±15mA drive and NR pin functionality. | Select for portable instruments where supply current <100µA is mandatory and load current ≤1mA. |
Compared with ADR441BRZ and REF5025AIDR, the MAX6225AEPA+ uniquely combines ultra-low noise, high output drive, and active noise reduction - making it optimal for high-speed, high-accuracy industrial and test systems where reference stability under dynamic load is non-negotiable.
Availability
MAX6225AEPA+ is available at Aetrix Electronics and suitable for high-resolution analog-to-digital conversion, precision current source design, and automated test equipment requiring stable component supply across extended temperature ranges.
Supply support for MAX6225AEPA+ 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 and mixed-signal ICs for demanding industrial, medical, and test applications - emphasizing low-noise, high-stability performance.
The MAX6225 series belongs to Maxim's ultra-precision voltage reference product line, engineered specifically for metrology-grade instrumentation and 16+ bit data converters where reference error dominates system accuracy.
FAQ
What is the maximum operating temperature range for the MAX6225AEPA+?
The MAX6225AEPA+ is rated for operation from –40°C to +85°C, as indicated by the "E" grade suffix in its part number. This extended industrial temperature range ensures reliable performance in factory automation controllers, outdoor test gear, and motor-drive feedback circuits where ambient temperatures exceed commercial limits. The device maintains all specified electrical characteristics - including 3.0ppm/°C max tempco and ±0.02% initial accuracy - across this full range.
Can the MAX6225AEPA+ drive a 10kΩ load directly without external buffering?
Yes, the MAX6225AEPA+ can directly drive a 10kΩ load (250µA at 2.5V) with negligible error: its load regulation is specified at ≤7ppm/mA, contributing only ~1.75ppm (0.0044mV) error - well within its ±0.02% initial accuracy. For heavier loads up to ±15mA (e.g., 167Ω), it remains fully specified without buffering, unlike most bandgap references that require op-amp followers.
How does the NR (Noise Reduction) pin function on the MAX6225AEPA+?
The NR pin on the MAX6225AEPA+ accepts an external 1µF capacitor to ground to suppress wideband noise - reducing integrated 0.1Hz–10kHz noise by up to 30%. This feature is unique to the MAX6225 family and eliminates the need for post-regulation RC filters that degrade transient response. Leaving NR open disables noise reduction but does not affect baseline performance or stability.
Is the MAX6225AEPA+ pin-compatible with older voltage references like the REF02CP?
Yes, the MAX6225AEPA+ uses an industry-standard 8-pin DIP pinout identical to REF02CP, LM399, and AD586 - with IN, NR, GND, TRIM, and OUT mapped to pins 2, 3, 4, 5, and 6 respectively. Pins 1, 7, and 8 are internally connected (no-connect), matching REF02's unused pins. This enables direct mechanical and electrical replacement in legacy designs without PCB modification.
What is the purpose of the TRIM pin on the MAX6225AEPA+, and how much adjustment does it provide?
The TRIM pin on the MAX6225AEPA+ allows precise external adjustment of the output voltage using a 10kΩ potentiometer between OUT and GND, with the wiper connected to TRIM. It provides ±15mV (±0.6%) trimming range while preserving the device's 3.0ppm/°C temperature coefficient - enabling final system calibration after PCB assembly without compromising long-term stability or noise performance.
MAX6225AEPA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Obsolete
- Reference Type:
- Series, Buried Zener
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- -
- Current - Output:
- 15 mA
- Tolerance:
- ±0.04%
- Temperature Coefficient:
- 3ppm/°C
- Noise - 0.1Hz to 10Hz:
- 1.5µVp-p
- Noise - 10Hz to 10kHz:
- 1.3µVrms
- Voltage - Input:
- 8V ~ 36V
- Current - Supply:
- 3mA
- Current - Cathode:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
MAX6225AEPA+ FAQ
1.How can I place an order for MAX6225AEPA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6225AEPA+ 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 MAX6225AEPA+ reliable?
The price and inventory of MAX6225AEPA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6225AEPA+ is usually 5 days.
3.What payment methods are accepted for MAX6225AEPA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6225AEPA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6225AEPA+?
MAX6225AEPA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6225AEPA+ 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 MAX6225AEPA+?
For technical support, including MAX6225AEPA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6225AEPA+ requirements.
6.How does Aetrix verify that MAX6225AEPA+ is sourced from the original manufacturer or authorized distributors?
All MAX6225AEPA+ 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 MAX6225AEPA+ meets industry standards.
7.What is the process for return or replacement of MAX6225AEPA+?
All MAX6225AEPA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6225AEPA+, 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 MAX6225AEPA+ part is unused and in its original packaging.
Return procedure for MAX6225AEPA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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