In the realm of precision analog electronics, the "reference" is the foundation upon which all measurements stand. The Analog Devices AD586LR is a legendary component in this space, known for providing a rock-solid 5.000 V output with exceptional stability.
Utilizing a proprietary buried Zener diode architecture, the AD586LR offers lower noise and drift compared to standard bandgap references. Whether you are designing a high-resolution 16-bit A/D converter system or calibrating industrial instrumentation, understanding the specific attributes of the "L" grade and "R" package is essential.
Table of Contents
- AD586LR Datasheet & Key Specifications
- SOIC-8 Pinout & PCB Configuration
- Circuit Design & Application Examples
- Conclusion
AD586LR Datasheet & Key Specifications
The AD586 series comes in various grades (J, K, L, M). The AD586LR specifically refers to the L-Grade in a standard SOIC-8 (Small Outline Integrated Circuit) package, indicated by the "R" suffix in Analog Devices' nomenclature.
Key Specifications Table
| Feature | Specification |
|---|---|
| Output Voltage | +5.000 V ± 2.5 mV |
| Temperature Coefficient (Drift) | 5 ppm/°C (Max) |
| Supply Voltage Range | +10.8 V to +36 V |
| Quiescent Current | 3.0 mA |
| Output Current Capacity | 10 mA |
| Noise (0.1 Hz to 10 Hz) | 4 µV p-p |
| Package | 8-Lead SOIC (R-8) |
Understanding the "L" Grade Accuracy
The "L" grade is one of the premium commercial tiers.
- Comparison: While the standard "J" grade has a drift of 25 ppm/°C, the AD586L offers a significantly tighter 5 ppm/°C maximum drift.
- Significance: For a system operating over a 50°C temperature span, an L-grade reference minimizes the error budget, ensuring reliable measurements without complex software calibration.
Price Analysis & Stock Availability
High-precision references like the AD586LR maintain steady demand.
Note: Precision analog parts often face lead time issues. [Check Stock for AD586LR at Aichiplink] to view real-time inventory from authorized global distributors.
SOIC-8 Pinout & PCB Configuration
The AD586LR uses a standard 8-pin SOIC pinout, but it includes special function pins that are critical for maximizing performance.
Pin Function Map
- Pin 1 (NC): No Connect.
- Pin 2 (VIN): Input Voltage (+10.8V to +36V).
- Pin 4 (GND): Ground.
- Pin 5 (TRIM): Fine output adjustment.
- Pin 6 (VOUT): +5V Output.
- Pin 8 (NR): Noise Reduction.
The Noise Reduction Pin (Pin 8)
One of the standout features of the AD586 is the NR pin.
- Function: By connecting a 1 µF capacitor between Pin 8 and Ground, you can form a low-pass filter with the internal resistance.
- Result: This significantly reduces high-frequency wideband noise, which is crucial for preventing bit-flipping in sensitive 14-bit or 16-bit ADC applications.
Fine-Trimming the Output Voltage
Although the AD586LR is laser-trimmed at the factory, some applications require absolute precision to match a specific system requirement.
- Circuit: Connect a 10kΩ potentiometer between the Output (Pin 6) and Ground, with the wiper connected to the TRIM (Pin 5) through a large resistor (approx 100kΩ).
- Adjustment: This allows for a narrow adjustment range of ±15 mV to calibrate out system offset errors.
Circuit Design & Application Examples
Standard 5V Source Connection
Integrating the AD586LR is straightforward:
- Connect a clean supply (>10.8V) to Pin 2.
- Place a 0.1 µF bypass capacitor close to Pin 2.
- Connect Pin 4 to a star ground point.
- Important: If driving a capacitive load (like a long cable or a large decoupling cap >0.1 µF on the output), check stability. The AD586 is stable with capacitive loads, but excessive capacitance may slow down transient response.
Comparison: AD586 vs. REF02
Engineers often decide between the AD586 and the classic REF02.
- REF02: Standard bandgap, higher noise, usually higher drift (10-25 ppm/°C for standard grades). Includes a "TEMP" output pin.
- AD586: Buried Zener architecture, lower noise, lower drift, and capable of sourcing more current (10mA). It is the superior choice for high-precision metrology.
Conclusion
The AD586LR remains a gold standard for 5V voltage references. Its combination of the "L" grade precision drift characteristics and the noise reduction capability makes it indispensable for precision circuit design.
Looking for high-precision voltage references? Ensure your measurements are accurate by sourcing authentic components. Visit Aichiplink.com to search for AD586LR and other Analog Devices precision parts.
Written by Jack Elliott from AIChipLink.
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We mainly source and distribute integrated circuit (IC) products of brands such as Broadcom, Microchip, Texas Instruments, Infineon, NXP, Analog Devices, Qualcomm, Intel, etc., which are widely used in communication & network, telecom, industrial control, new energy and automotive electronics.
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Frequently Asked Questions
What is the minimum input voltage for AD586LR?
The AD586 requires a "headroom" of approximately 5.8V. Therefore, the minimum input supply voltage is **+10.8 V** to maintain a regulated +5.000 V output.
Can the AD586LR sink current?
The AD586 is primarily designed to **source** current (up to 10 mA). It has very limited current sinking capability. If your load requires sinking, an external buffer op-amp is recommended.
What is the difference between AD586AR and AD586LR?
The difference lies in the accuracy grade. * **A-Grade**: 20 mV initial error, 25 ppm/°C drift. * **L-Grade**: 2.5 mV initial error, 5 ppm/°C drift. The "R" in both denotes the SOIC-8 package.
Does the AD586LR require an output capacitor?
No, it does not strictly require an output capacitor for stability, unlike some LDOs. However, a small decoupling capacitor (0.1 µF) is often used to buffer transient load steps.
Why use a Buried Zener reference over a Bandgap?
Buried Zener references like the AD586 generally offer lower noise and better long-term stability than Bandgap references, making them ideal for high-end instrumentation, though they typically require higher supply voltages (headroom).
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