AD780ARZ-REEL7 - 2.5V/3.0V High Precision Reference | Analog Devices
MPN: AD780ARZ-REEL7 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $8.05 | $8.05 |
| 10 | $7.5 | $75.00 |
| 100 | $6.8 | $680.00 |
| 500 | $6.2 | $3,100.00 |
| 1,000 | $5.6 | $5,600.00 |
AD780ARZ-REEL7 Overview
A voltage reference is a crucial component in analog and mixed-signal systems, providing a stable and accurate voltage that serves as a benchmark for analog-to-digital converters (ADCs), digital-to-analog converters (DACs), and comparators. The AD780 belongs to the category of series voltage references, which regulate output voltage by controlling the current through a pass element, offering low output impedance and excellent load regulation. This makes it suitable for driving dynamic loads without significant voltage droop.
Key features of the AD780 include a programmable output voltage (2.5V or 3.0V), a wide supply voltage range (up to 36V), and a maximum output current of 10 mA. The device also includes a temperature output pin that can be used as a temperature transducer, providing a voltage proportional to temperature. The AD780 is a pin-compatible performance upgrade for the LT1019(A)-2.5 and the AD680, offering improved specifications and reliability.
Technically, the AD780 utilizes a band gap architecture with laser-trimmed thin-film resistors to achieve high accuracy and low drift. The device operates over a temperature range of -40°C to +85°C (grade A) and is available in multiple grades (A, B, C) with varying accuracy and temperature coefficient specifications. The AD780 also features low quiescent current, making it suitable for battery-powered applications.
Typical applications include precision data acquisition systems, high-resolution ADCs and DACs, industrial process control, and portable instrumentation. The AD780's low noise and high stability make it an excellent choice for reference designs in medical devices, automotive electronics, and communication systems.
When designing with the AD780, it is important to place a 0.1 µF bypass capacitor close to the VIN pin and a 1 µF capacitor on the output to ensure stability. Additionally, the temperature output pin can be used for temperature sensing, but care must be taken to avoid loading it excessively.
Drop-in alternatives for AD780ARZ-REEL7 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with AD780ARZ-REEL7 (same form factor and footprint) — differing in Output Voltage, Temperature Coefficient, Wideband Noise Density, Operating Temperature Range, Output Current.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
AD780ARZ
✅ Drop-In✓ In Stock
$5.65 / Unit
View Datasheet →AD780BRZ-REEL7
✅ Drop-In✓ In Stock
$5.6 / Unit
View Datasheet →AD780CRZ-REEL7
✅ Drop-In📋 Reference alternative (not in catalog)
LT1019A-2.5
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
ADR06ARZ-REEL7
⚡ Same Package📋 Reference alternative (not in catalog)
AD780ARZ-REEL7 Maximum Ratings & Electrical Characteristics
| Output Voltage | 2.5V or 3.0V (programmable) |
| Initial Accuracy | ±0.2% (grade A) |
| Temperature Coefficient | 3 ppm/°C (grade A) |
| Output Current | 10 mA (max) |
| Supply Voltage Range | 4.5V to 36V |
| Output Noise (0.1 Hz to 10 Hz) | 4 µV p-p (typ) |
| Wideband Noise Density | 100 nV/√Hz (typ) |
| Quiescent Current | 1 mA (typ) |
| Operating Temperature Range | -40°C to +85°C (grade A) |
| Package | 8-SOIC (SOIC-8) |
| Mounting Type | Surface Mount |
| Temperature Output Pin | Yes |
| Long-Term Stability | 50 ppm/1000 hrs (typ) |
| RoHS Status | Compliant |
| Lifecycle | Production |
AD780ARZ-REEL7 Pin Configuration
| Pin 1 | VIN — Positive supply input (4.5V to 36V) |
| Pin 2 | GND — Ground |
| Pin 3 | VOUT — Reference output (2.5V or 3.0V) |
| Pin 4 | SEL — Output voltage select: low for 2.5V, high for 3.0V |
| Pin 5 | TEMP — Temperature output (voltage proportional to temperature) |
| Pin 6 | NC — No connect |
| Pin 7 | NC — No connect |
| Pin 8 | NC — No connect |
Typical Applications
AD780ARZ-REEL7 is suitable for 6 applications: Precision Data Acquisition Systems, Portable Instrumentation, Industrial Process Control, Medical Devices, Automotive Electronics, Communication Systems.
Precision Data Acquisition Systems
The AD780ARZ-REEL7 provides a stable 2.5V or 3.0V reference for high-resolution ADCs and DACs, ensuring accurate conversion. Its low noise (4 µV p-p) and low temperature drift (3 ppm/°C) maintain signal integrity over temperature, making it ideal for industrial data acquisition and instrumentation. The programmable output allows flexibility in system design, and the temperature output pin can be used for on-board temperature monitoring.
Recommended
Portable Instrumentation
In battery-powered instruments, the AD780's low quiescent current (1 mA) and wide supply range (up to 36V) enable efficient operation. The 2.5V output is compatible with many low-voltage ADCs, while the 3.0V option supports legacy systems. The small 8-SOIC package saves board space, and the temperature output can be used for environmental compensation in portable meters and field devices.
Recommended
Industrial Process Control
The AD780's high accuracy and stability over -40°C to +85°C make it suitable for industrial control loops, PLCs, and sensor conditioning. Its 10 mA output current can drive multiple loads, and the low noise ensures precise analog signal processing. The programmable output allows adaptation to different sensor ranges, and the temperature output aids in thermal management of control cabinets.
Recommended
Medical Devices
In medical monitoring equipment, the AD780 provides a reliable reference for vital sign measurement circuits. Its low noise and low drift ensure accurate readings, while the wide supply range accommodates various power architectures. The temperature output can be used for patient temperature monitoring, and the small package is suitable for compact wearable devices.
Recommended
Automotive Electronics
The AD780 operates over the automotive temperature range and can handle supply voltages up to 36V, making it suitable for automotive battery monitoring, motor control, and infotainment systems. Its low noise ensures clean references for ADCs in engine control units, and the temperature output can be used for thermal protection. The device's robustness and long-term stability meet automotive reliability requirements.
Recommended
Communication Systems
In communication infrastructure, the AD780 provides a stable reference for RF transceivers and baseband processors. Its low noise (100 nV/√Hz) minimizes phase noise in PLLs, and the programmable output allows interface with different logic levels. The temperature output can be used for oscillator compensation, and the wide supply range supports various power rails.
Recommended
Recommended Products Summary
Engineering reference data for AD780ARZ-REEL7 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | AD780ARZ | AD780BRZ-REEL7 | AD780CRZ-REEL7 | LT1019A-2.5 |
|---|---|---|---|---|---|
| Package | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Output Voltage | 2.5V or 3.0V (programmable) | 2.5V or 3.0V | 2.5V or 3.0V | 2.5V or 3.0V | 2.5V fixed |
| Initial Accuracy | ±0.2% | ±0.2% | ±0.1% | ±0.2% | ±0.05% |
| Temperature Coefficient | 3 ppm/°C | 3 ppm/°C | 3 ppm/°C | 5 ppm/°C | 5 ppm/°C |
| Output Noise (0.1-10 Hz) | 4 µV p-p | 4 µV p-p | 4 µV p-p | 4 µV p-p | 6 µV p-p |
| Temperature Output Pin | Yes | Yes | Yes | Yes | No |
| Supply Voltage Range | 4.5V to 36V | 4.5V to 36V | 4.5V to 36V | 4.5V to 36V | 4.5V to 40V |
Key Differentiators
- Programmable output voltage (2.5V/3.0V) with temperature output pin (vs LT1019A-2.5)
- Lower noise (4 µV p-p) compared to LT1019A-2.5 (6 µV p-p) (vs LT1019A-2.5)
- Multiple grades (A, B, C) for cost/performance optimization (vs ADR06ARZ-REEL7)
Design Notes
Place a 0.1 µF bypass capacitor close to the VIN pin and a 1 µF output capacitor on VOUT to ensure stability. Use low-ESR ceramic capacitors. For best noise performance, add a 0.01 µF capacitor between the TEMP pin and ground to filter noise.
The AD780 dissipates minimal power (typically <10 mW) due to its low quiescent current and output current. However, at maximum output current (10 mA) and high supply voltage (36V), power dissipation can reach 360 mW. Ensure adequate copper area on the PCB for heat dissipation if operating at these extremes.
Do not connect the SEL pin to an undefined voltage; tie it to GND for 2.5V or VIN for 3.0V. Avoid loading the TEMP pin with more than 1 mA, as this can affect accuracy. Also, ensure the supply voltage is at least 4.5V to maintain regulation.
Compliance Information
RoHS compliant per Analog Devices product page. Not AEC-Q100 qualified. Lead-free per datasheet.
