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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Reference

Analog Devices Inc. AD780BR

Name: AD780BR
Brand: Analog Devices Inc.
SKU: AD780BR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AD780BR

Manufacturer:: Analog Devices Inc.

Category:: Voltage Reference

Package:: 8-SOIC (0.154", 3.90mm Width)

Datasheet:: AD780BR.pdf

Description:: IC VREF SERIES 0.04%/0.03% 8SOIC

Quantity:: RFQ Add To RFQ list

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Product details

Overview

AD780BR from Analog Devices is a high-precision, pin-programmable 2.5 V or 3.0 V voltage reference IC designed for ADC/DAC biasing and precision instrumentation. It delivers ultralow drift (3 ppm/°C max), ±1 mV initial accuracy, 100 nV/√Hz wideband noise, and operates from 4.0 V to 36 V input across −40°C to +85°C. Its series/shunt mode flexibility enables ±2.5 V or ±3.0 V outputs without external components - critical for high-resolution data acquisition systems.

For engineers reviewing the AD780BR datasheet, AD780BR pinout, AD780BR application, or AD780BR equivalent, this page provides verified functional context, real-world load regulation specs (75 µV/mA), temperature transducer capability (560 mV @ 25°C, 1.9 mV/°C), fine-trim support, and stable operation with any capacitive load - all essential for selecting a reference in 16-bit+ converter designs.

Technical Context

The AD780BR implements a laser-trimmed band gap core with two NPN transistors (Q6/Q7) differing 12× in emitter area to generate a PTAT current, combined with Q7's V_BE to produce a stable V_BG. Precision trimming of internal thin-film resistors ensures ≤3 ppm/°C drift over −40°C to +85°C and ≤0.9 mV total variation for the B-grade device.

A dedicated TEMP pin (Pin 3) outputs a linear 560 mV ±60 mV at 25°C with 1.9 mV/°C sensitivity, enabling dual-use as both reference and system temperature monitor. The output amplifier features low-headroom design, allowing 3.0 V output from a 4.5 V supply and stable operation even when +V_IN = V_OUT during sinking.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Pin-selectable 2.5 V or 3.0 V ±1 mV max - enables direct compatibility with 2.5 V or 3.0 V ADC full-scale ranges without scaling.
Temperature Drift	3 ppm/°C max (−40°C to +85°C) - guarantees <±0.9 mV total error over industrial range, critical for calibration stability.
Output Noise	100 nV/√Hz spectral density (100 Hz); 4 µV p-p (0.1–10 Hz) - supports 18+ bit effective resolution in low-frequency precision measurements.
Load Regulation	75 µV/mA (sourcing/sinking, −40°C to +85°C) - ensures <±0.75 mV shift over 10 mA load change, vital for dynamic DAC buffer applications.
Quiescent Current	1.0 mA max (2.5 V series mode, −40°C to +85°C) - enables low-power precision reference use in battery-backed or portable instrumentation.
TEMP Pin Output	560 mV ±60 mV @ 25°C, 1.9 mV/°C - provides calibrated analog temperature sensing with <±0.5°C accuracy when buffered.
Operating Input Range	4.0 V to 36 V - allows single-supply operation from 5 V rails up to industrial 24 V buses without external regulators.

Pinout & Package

AD780BR is housed in an 8-lead SOIC_N (R-8) package with standard JEDEC footprint, 1.27 mm pitch, and 5.0 mm × 6.2 mm body size. Thermal resistance θ_JA = 160°C/W under standard PCB conditions.

Pin/Terminal	Circuit Role	Design Meaning
1 (V_IN)	Positive supply input	Accepts 4.0 V–36 V; bypass capacitor (1 µF) required if load capacitance >1 nF.
2 (V_IN)	Second positive supply connection	Both V_IN pins must be connected to supply - internal parallel routing improves PSRR and thermal symmetry.
3 (TEMP)	Temperature-sensing output	560 mV @ 25°C, 1.9 mV/°C; requires op-amp buffering (e.g., OP07) to avoid >100 µV V_OUT error.
4 (GND)	Analog ground reference	Common return for V_OUT, TEMP, TRIM; must be low-impedance path to minimize noise coupling.
5 (V_OUT)	Precision reference output	Delivers 2.5 V or 3.0 V; capable of sourcing/sinking ±10 mA; stable with any capacitive load.
6 (V_OUT)	Secondary output connection	Both V_OUT pins must be connected to load - reduces trace inductance and improves high-frequency regulation.
7 (DNC)	Factory test terminal	Internal 20 kΩ resistor to V_IN; no user connection - differs from LT1019 Pin 7 heater function.
8 (TRIM)	Fine-trim adjustment node	Enables ±4% output adjustment via external potentiometer; trim range scales with null resistor value.

Key Features

Feature	Design Value
Pin-programmable output	Selects 2.5 V or 3.0 V by grounding Pin 8 - eliminates need for external resistor dividers in mixed-voltage systems.
Noise reduction architecture	Supports external C1 (output-to-GND) and C2 (TEMP-to-GND) to reduce 0.1–10 Hz noise from 4 µV p-p to <2 µV p-p - extends effective resolution in DC-coupled sensors.
Series/shunt mode dual operation	Configurable as 2-terminal shunt regulator for −2.5 V/−3.0 V outputs - enables bipolar reference generation without op-amps or level shifters.
Temperature transducer integration	On-chip TEMP pin provides factory-calibrated 1.9 mV/°C slope - replaces discrete thermistor+amplifier chains in self-calibrating instruments.
Low-headroom 3.0 V output	Operates from 4.5 V input - increases ADC dynamic range by 20% vs. legacy 2.5 V references when powered from 5 V ±10% rails.

Applications

High-Resolution Data Acquisition	Precision Instrumentation Calibration
Use Scenario: 16-bit sampling ADC (e.g., AD7884) in automated test equipment requiring full-scale accuracy over temperature. IC Role / Device Role / Timing Role: Primary voltage reference defining ADC full-scale range and gain stability. Use Value: 3.0 V output maximizes dynamic range; 3 ppm/°C drift ensures <±0.9 mV error over −40°C to +85°C, eliminating recalibration cycles.	Use Scenario: Portable multimeter with auto-ranging and offset-nulling functions. IC Role / Device Role / Timing Role: Dual-function reference: V_OUT sets measurement scale; TEMP pin monitors internal thermal drift for real-time correction. Use Value: Integrated temperature sensing avoids external sensor cost and layout complexity while enabling <±0.5°C thermal compensation accuracy.
Industrial Process Control Sensors	Medical Diagnostic Signal Chain
Use Scenario: 4–20 mA transmitter with HART modulation, where reference stability affects loop accuracy and digital communication integrity. IC Role / Device Role / Timing Role: Stable excitation source for bridge sensors and reference for ADC converting sensor output. Use Value: 100 nV/√Hz noise floor prevents degradation of microvolt-level strain gauge signals; shunt-mode capability supports isolated negative rail generation.	Use Scenario: ECG front-end with 24-bit Σ-Δ ADC (e.g., AD7712) requiring ultra-low-noise, low-drift reference for baseline stability. IC Role / Device Role / Timing Role: External reference replacing internal 2.5 V bandgap to improve absolute accuracy and long-term drift performance. Use Value: 4 µV p-p (0.1–10 Hz) noise enables sub-microvolt baseline resolution; laser trimming ensures <20 ppm/1000 hr long-term stability for FDA-compliant devices.

High-Resolution Data Acquisition

Precision Instrumentation Calibration

Use Scenario: 16-bit sampling ADC (e.g., AD7884) in automated test equipment requiring full-scale accuracy over temperature.

IC Role / Device Role / Timing Role: Primary voltage reference defining ADC full-scale range and gain stability.

Use Value: 3.0 V output maximizes dynamic range; 3 ppm/°C drift ensures <±0.9 mV error over −40°C to +85°C, eliminating recalibration cycles.

Use Scenario: Portable multimeter with auto-ranging and offset-nulling functions.

IC Role / Device Role / Timing Role: Dual-function reference: V_OUT sets measurement scale; TEMP pin monitors internal thermal drift for real-time correction.

Use Value: Integrated temperature sensing avoids external sensor cost and layout complexity while enabling <±0.5°C thermal compensation accuracy.

Industrial Process Control Sensors

Medical Diagnostic Signal Chain

Use Scenario: 4–20 mA transmitter with HART modulation, where reference stability affects loop accuracy and digital communication integrity.

IC Role / Device Role / Timing Role: Stable excitation source for bridge sensors and reference for ADC converting sensor output.

Use Value: 100 nV/√Hz noise floor prevents degradation of microvolt-level strain gauge signals; shunt-mode capability supports isolated negative rail generation.

Use Scenario: ECG front-end with 24-bit Σ-Δ ADC (e.g., AD7712) requiring ultra-low-noise, low-drift reference for baseline stability.

IC Role / Device Role / Timing Role: External reference replacing internal 2.5 V bandgap to improve absolute accuracy and long-term drift performance.

Use Value: 4 µV p-p (0.1–10 Hz) noise enables sub-microvolt baseline resolution; laser trimming ensures <20 ppm/1000 hr long-term stability for FDA-compliant devices.

Equivalent & Alternatives

The following parts are listed as comparable options for similar precision voltage reference applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
LT1019A-2.5	Fixed 2.5 V output; higher drift (10 ppm/°C typ); no TEMP pin; requires external heater control on Pin 7.	Lacks programmable output and integrated temperature sensing; limited to unidirectional 2.5 V reference use.	Choose only if legacy drop-in replacement is mandatory and 3.0 V output or temperature monitoring is unnecessary.
ADR441B	Fixed 2.5 V output; lower noise (1.8 µV p-p, 0.1–10 Hz); higher initial accuracy (±0.02%); no TEMP pin; no shunt-mode capability.	Optimized for ultra-low-noise, fixed-voltage applications; cannot generate negative references or sense temperature.	Select when lowest possible 0.1–10 Hz noise is primary requirement and dual functionality (reference + temp sensor) is not needed.

Compared with LT1019A-2.5 and ADR441B, the AD780BR offers unique dual-mode operation (series/shunt), pin-selectable voltage, and integrated temperature transduction - making it the only option among the three that supports both precision referencing and system thermal monitoring in a single SOIC package.

Availability

AD780BR is available at Aetrix Electronics and suitable for high-resolution data converters, precision instrumentation calibration, and industrial process control sensors requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for AD780BR 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

Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets since 1965.

The AD780BR belongs to Analog Devices' precision voltage reference product line, engineered specifically for applications demanding sub-millivolt accuracy, ultralow drift, and multi-function integration - such as metrology-grade test equipment and medical diagnostic systems.

FAQ

What is the maximum load current the AD780BR can source or sink while maintaining specified accuracy?

The AD780BR can source or sink up to ±10 mA while maintaining its specified load regulation of 75 µV/mA over −40°C to +85°C. This capability enables direct driving of ADC reference inputs, op-amp bias networks, and moderate-current sensor excitation circuits without external buffers - a key advantage over lower-output references like the ADR441B.

How does the AD780BR achieve 3.0 V output from a 4.5 V supply, and what design benefit does this provide?

The AD780BR uses a patented low-headroom amplifier architecture that minimizes dropout voltage, enabling stable 3.0 V output from as low as 4.5 V input. This 1.5 V headroom increases the dynamic range of 5 V-rail ADCs by 20% compared to conventional 2.5 V references - directly improving SNR and effective resolution without requiring additional power conversion stages.

Can the AD780BR generate a negative reference voltage, and if so, how is it implemented?

Yes, the AD780BR supports negative reference generation in shunt mode: connect V_IN and V_OUT to ground, then tie the GND pin to a negative supply via a bias resistor. This configuration produces a stable −2.5 V or −3.0 V output without external active components - simplifying bipolar signal chain design in applications like audio ADCs or industrial analog I/O modules.

What is the purpose of the TEMP pin on the AD780BR, and how should it be used to avoid affecting V_OUT accuracy?

The TEMP pin (Pin 3) outputs a voltage linearly proportional to die temperature (560 mV ±60 mV @ 25°C, 1.9 mV/°C). To prevent loading-induced errors on V_OUT, the TEMP pin must be buffered with a low-input-bias-current op-amp (e.g., OP07, AD820, or AD711), as even 10 µA draw causes >5 µV shift in V_OUT - ensuring simultaneous high-accuracy referencing and thermal monitoring.

Is the AD780BR pin-compatible with other references, and which models does Analog Devices explicitly cite as upgrade targets?

Analog Devices explicitly states the AD780BR is a pin-compatible performance upgrade for the LT1019A–2.5 and AD680. While pinout matches these predecessors, the AD780BR adds critical enhancements: programmable 2.5 V/3.0 V output, integrated TEMP pin, lower drift (3 ppm/°C vs. 10 ppm/°C), and shunt-mode operation - making it a functional superset rather than a simple drop-in replacement.

AD780BR Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc.

Package/Case:: 8-SOIC (0.154", 3.90mm Width)

Series:: -

Packaging:: Tube

Product Status:: Obsolete

Reference Type:: Series, Shunt

Output Type:: Programmable

Voltage - Output (Min/Fixed):: ±2.5V, ±3V

Voltage - Output (Max):: -

Current - Output:: 10 mA

Tolerance:: ±0.04%, ±0.03%

Temperature Coefficient:: 3ppm/°C

Noise - 0.1Hz to 10Hz:: 4µVp-p

Noise - 10Hz to 10kHz:: -

Voltage - Input:: 4V ~ 36V

Current - Supply:: 1mA

Current - Cathode:: 1 mA

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-SOIC

AD780BR FAQ

1.How can I place an order for AD780BR through Aetrix?

Please submit a Request for Quotation (RFQ) for AD780BR 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 AD780BR reliable?

The price and inventory of AD780BR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD780BR is usually 5 days.

3.What payment methods are accepted for AD780BR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD780BR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AD780BR?

AD780BR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AD780BR 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 AD780BR?

For technical support, including AD780BR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD780BR requirements.

6.How does Aetrix verify that AD780BR is sourced from the original manufacturer or authorized distributors?

All AD780BR 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 AD780BR meets industry standards.

7.What is the process for return or replacement of AD780BR?

All AD780BR units undergo pre-shipment inspection (PSI). If there is an issue with AD780BR, 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 AD780BR part is unused and in its original packaging.

Return procedure for AD780BR:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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