AD780ARZ - 2.5V/3.0V High Precision Reference | Analog Devices
MPN： AD780ARZ ✓ 啟用中AD780ARZ 概覽
A voltage reference is a crucial building block in analog and mixed-signal systems, providing a stable and accurate voltage against which other voltages are measured or regulated. The AD780 belongs to the family of precision voltage references, which are essential for ADCs, DACs, and comparators to achieve high resolution and accuracy. As a bandgap reference, it leverages the predictable temperature behavior of a silicon bandgap to produce a stable output, offering a cost-effective alternative to buried Zener references while maintaining high performance.
Key features of the AD780ARZ include a temperature output pin that allows the device to function as a temperature transducer, a trim pin for fine-tuning output voltage, and low quiescent current that increases by only 2 µA/V above 5 V input. The device operates over a wide temperature range of -40°C to +85°C and is available in both SOIC-8 and DIP-8 packages. Its long-term stability is specified as noncumulative, with drift in subsequent 1000-hour periods significantly lower than the first.
The AD780 uses a proprietary bandgap architecture that achieves low noise and high stability without the need for external components. The output can be programmed to 2.5 V or 3.0 V via a logic pin, providing flexibility in system design. The device also features a force and sense configuration for high-accuracy remote sensing, minimizing errors due to trace resistance.
Typical applications include precision data acquisition systems, high-resolution ADCs and DACs, digital voltmeters, and industrial process control. Its low noise and high accuracy make it suitable for medical instrumentation and aerospace test equipment. The AD780 is a pin-compatible performance upgrade for the LT1019(A)-2.5 and the AD680, simplifying upgrades in existing designs.
When designing with the AD780, ensure proper decoupling with a 0.1 µF capacitor close to the VIN pin and a 1 µF capacitor on the output to maintain stability. The trim pin can be used to adjust the output voltage by ±0.5% to meet tight system requirements. For best noise performance, use the optional external noise reduction capacitors as described in the datasheet.
直接替換替代品，適用於 AD780ARZ — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： AD780ARZ （相同外形與佔位） — 差異在於 Output Voltage, Quiescent Current, Temperature Coefficient, Operating Temperature Range, Output Current.
AD780ARZ-REEL7
✅ 直接替換聯絡詢價
查看資料表 →AD780BRZ
✅ 直接替換聯絡詢價
查看資料表 →ADR06ARZ
✅ 直接替換📋 參考替代品（不在目錄中）
LT1019A-2.5
✅ 直接替換📋 參考替代品（不在目錄中）
AD680ARZ
✅ 直接替換📋 參考替代品（不在目錄中）
REF02AU
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
AD780ARZ 最大額定值與電氣特性
| 輸出電壓 | 2.5 V or 3.0 V (programmable) |
| Output Voltage Accuracy | ±0.2% (A grade), ±0.17% (B grade) |
| 輸入電壓範圍 | 4 V to 36 V |
| Output Current | 10 mA (max) |
| Output Noise (0.1 Hz to 10 Hz) | 4 µV p-p (typical) |
| Wideband Noise Density | 100 nV/√Hz (typical) |
| Temperature Coefficient | 3 ppm/°C (max, A grade) |
| 靜態電流 | 1 mA (typical) |
| Long-Term Stability | 50 ppm/1000 hrs (typical) |
| 工作溫度範圍 | -40°C to +85°C |
| 封裝 | 8-SOIC (SOIC-8) |
| 安裝類型 | Surface Mount |
| 輸出類型 | Series and Shunt |
| Temperature Output Pin | Yes |
| Trim Pin | Yes |
AD780ARZ 腳位配置
| 腳位 1 | TRIM — Output voltage trim pin |
| 腳位 2 | VIN — Input supply voltage |
| 腳位 3 | GND — Ground |
| 腳位 4 | TEMP — Temperature output |
| 腳位 5 | VOUT — Reference output |
| 腳位 6 | SENSE — Sense pin for remote sensing |
| 腳位 7 | SEL — Output voltage select (2.5V or 3.0V) |
| 腳位 8 | NC — No connect |
典型應用
AD780ARZ 適用於 6 應用s: Precision Data Acquisition Systems, High-Resolution ADC/DAC Reference, Industrial Process Control, Medical Instrumentation, Test and Measurement Equipment, Aerospace and Defense.
Precision Data Acquisition Systems
The AD780ARZ provides a stable 2.5V or 3.0V reference for high-resolution ADCs and DACs. Its low noise (4 µV p-p) and low temperature coefficient (3 ppm/°C) ensure accurate conversions over temperature. The programmable output allows flexibility in system design, and the force/sense capability minimizes errors from trace resistance. This makes it ideal for multichannel data acquisition systems in industrial and laboratory equipment.
推薦
High-Resolution ADC/DAC Reference
In high-resolution converters, the reference voltage directly impacts linearity and noise. The AD780ARZ's ultra-low noise and high accuracy make it an excellent choice for driving the reference input of 16-bit and 24-bit ADCs. Its 10 mA output current can drive multiple converters, and the temperature output pin can be used for system calibration. The device's low quiescent current is beneficial in battery-powered instruments.
推薦
Industrial Process Control
Industrial process control systems require stable references for accurate measurement and control loops. The AD780ARZ operates over a wide input range (4V to 36V) and temperature range (-40°C to +85°C), making it suitable for harsh industrial environments. Its long-term stability (50 ppm/1000 hrs) ensures consistent performance over time. The programmable output allows it to interface with various sensor and actuator systems.
推薦
Medical Instrumentation
Medical devices such as patient monitors and diagnostic equipment demand high accuracy and reliability. The AD780ARZ's low noise and low drift ensure precise measurements in vital sign monitoring. Its small SOIC-8 package is suitable for compact designs. The temperature output pin can be used for temperature compensation in medical sensors. The device's wide input range accommodates various power supply configurations.
推薦
Test and Measurement Equipment
Digital multimeters, precision calibrators, and bench instruments rely on accurate voltage references. The AD780ARZ provides the stability and low noise required for high-resolution measurements. Its programmable output (2.5V or 3.0V) allows it to be used in various calibration circuits. The force/sense capability enables accurate remote sensing, reducing errors in long PCB traces. The device's long-term stability ensures calibration intervals can be extended.
推薦
Aerospace and Defense
In aerospace and defense systems, components must meet stringent reliability and performance standards. The AD780ARZ's wide temperature range and low noise make it suitable for avionics, radar, and communication systems. Its high accuracy ensures precise signal processing in navigation and targeting systems. The device's robust design and long-term stability are critical for mission-critical applications.
推薦
推薦產品摘要
工程參考資料，適用於 AD780ARZ — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | AD780ARZ-REEL7 | AD780BRZ | ADR06ARZ | LT1019A-2.5 | AD680ARZ | REF02AU |
|---|---|---|---|---|---|---|---|
| Package | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Texas Instruments |
| Output Voltage | 2.5V or 3.0V (programmable) | 2.5V or 3.0V (programmable) | 2.5V or 3.0V (programmable) | 2.5V (fixed) | 2.5V (fixed) | 2.5V (fixed) | 5V (fixed) |
| Output Voltage Accuracy | ±0.2% (A grade) | ±0.2% | ±0.17% | ±0.2% | ±0.05% | ±0.4% | ±0.5% |
| Output Noise (0.1-10Hz) | 4 µV p-p | 4 µV p-p | 4 µV p-p | 10 µV p-p | 3 µV p-p | 10 µV p-p | 15 µV p-p |
| Temperature Coefficient | 3 ppm/°C (max) | 3 ppm/°C | 3 ppm/°C | 2 ppm/°C | 5 ppm/°C | 5 ppm/°C | 8.5 ppm/°C |
| Output Current | 10 mA | 10 mA | 10 mA | 10 mA | 10 mA | 10 mA | 10 mA |
| Temperature Output Pin | Yes | Yes | Yes | No | No | No | No |
主要差異化特點
- Programmable output voltage (2.5V or 3.0V) (對比ADR06ARZ)
- Temperature output pin (對比ADR06ARZ)
- Lower noise (4 µV p-p) (對比ADR06ARZ)
設計說明
Place a 0.1 µF ceramic capacitor close to the VIN pin and a 1 µF capacitor on the VOUT pin to ensure stability. For best noise performance, add a 0.01 µF capacitor between the TRIM and VOUT pins as recommended in the datasheet. Keep traces short and use a ground plane to minimize noise pickup.
The AD780ARZ dissipates minimal power due to its low quiescent current (1 mA typical). However, at high input voltages (e.g., 36V) and maximum output current (10 mA), power dissipation can reach 350 mW. Ensure adequate copper area on the PCB for heat dissipation, especially in high-temperature environments.
Do not exceed the input voltage rating of 36V. The SEL pin must be tied to VOUT for 2.5V output or to GND for 3.0V output; floating it can cause unpredictable behavior. The TRIM pin should not be left unconnected; tie it to VOUT if not used. For remote sensing, connect SENSE to the load point to avoid voltage drops.
合規資訊
RoHS compliant per Analog Devices product page. Not AEC-Q100 qualified. Lead-free finish.
