AD780BRZ - 2.5V/3.0V High Precision Reference | Analog Devices
MPN: AD780BRZ ✓ Hoạt độngAD780BRZ Tóm tắt
A voltage reference is a crucial building block in analog and mixed-signal systems, providing a stable and accurate voltage for analog-to-digital converters (ADCs), digital-to-analog converters (DACs), and comparators. The AD780 belongs to the family of series and shunt voltage references, which can be configured for either mode. It is a programmable reference, allowing the user to select between 2.5 V and 3.0 V outputs via a pin. This flexibility makes it a versatile choice for various system voltage requirements.
Key features of the AD780BRZ include pin-programmable 3.0 V output, ultralow drift of 3 ppm/°C max, high accuracy of ±1 mV max, low noise of 100 nV/√Hz, and low quiescent current of 1 mA max. The device also offers noise reduction capability, allowing external capacitors to further reduce noise. The temperature output pin enables the AD780 to be configured as a temperature transducer while providing a stable reference voltage.
Technically, the AD780 uses a bandgap reference architecture, which provides a stable voltage that is relatively independent of temperature and supply variations. The device is designed for high precision, with a temperature coefficient as low as 3 ppm/°C, ensuring minimal voltage drift over temperature. The wide input voltage range of 4 V to 36 V allows operation from various supply rails, including 5 V, 12 V, and 24 V systems. The low quiescent current of 1 mA max makes it suitable for battery-powered applications.
Typical applications for the AD780BRZ include precision data acquisition systems, industrial process control, medical instrumentation, and portable test equipment. Its high accuracy and low noise make it ideal for use as a reference for high-resolution ADCs and DACs. The device is also used in power supply monitoring and calibration equipment.
When designing with the AD780BRZ, it is important to ensure proper decoupling and layout to achieve the specified performance. The noise reduction pin can be used with an external capacitor to further reduce output noise. The temperature output pin can be utilized for temperature sensing applications, but care must be taken to avoid loading the reference output.
Bộ thay thế dễ dàng lắp đặt cho AD780BRZ — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với AD780BRZ (cùng hình factor và footprint) — khác nhau ở Output Current, Output Voltage, Package, Temperature Coefficient, Input Voltage Range.
AD780BR
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
AD780ARZ
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →LT1019ACS8-2.5
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
LT1019ACS8-3
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
REF192GSZ
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
MAX6126AASA25
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
MAX6126AASA30
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
AD780BRZ Tỷ lệ tối đa & tính chất điện
| Reference Type | Series, Shunt, Programmable |
| Điện áp đầu ra | ±2.5V, ±3V |
| Tolerance | ±1 mV |
| Temperature Coefficient | 3 ppm/°C |
| Phạm vi điện áp đầu vào | 4 V ~ 36 V |
| Output Current | 10 mA |
| Noise | 100 nV/√Hz |
| Điện áp yên tĩnh | 1 mA max |
| Khoảng nhiệt độ hoạt động | -40°C to +85°C |
| Hộp | 8-SOIC |
| Kiểu lắp đặt | Surface Mount |
| Number of Channels | 1 |
| Long-term Stability | Noncumulative |
| Trạng thái RoHS | Compliant |
| Trạng thái vòng đời | Production |
Cấu hình chân AD780BRZ
| Chân 1 | VIN — Input supply voltage (4V to 36V) |
| Chân 2 | VOUT — Reference output (2.5V or 3.0V) |
| Chân 3 | GND — Ground |
| Chân 4 | TRIM — Output voltage trim |
| Chân 5 | TEMP — Temperature output |
| Chân 6 | NR — Noise reduction |
| Chân 7 | SEL — Output voltage select (2.5V/3.0V) |
| Chân 8 | NC — No connect |
Ứng dụng tiêu biểu
AD780BRZ phù hợp cho 6 Áp dụngs: Precision Data Acquisition, Industrial Process Control, Medical Instrumentation, Portable Test Equipment, Automotive Electronics, Telecommunications.
Precision Data Acquisition
The AD780BRZ provides a stable 2.5V or 3.0V reference for high-resolution ADCs and DACs. Its low noise (100 nV/√Hz) and low drift (3 ppm/°C) ensure accurate conversions in industrial and laboratory instruments. The wide input range (4V-36V) allows direct connection to various supply rails, simplifying power design. For best performance, place a 0.1µF decoupling capacitor close to the VIN pin and a 1µF capacitor on the output. The temperature output pin can be used for system monitoring without affecting reference accuracy.
Được đề xuất
Industrial Process Control
In industrial environments, the AD780BRZ offers reliable performance over temperature with 3 ppm/°C drift. It can be used as a reference for analog input modules, PLCs, and transmitters. The device's low quiescent current (1 mA) is beneficial for loop-powered instruments. Its series/shunt capability allows flexible configuration. For harsh environments, consider conformal coating and proper PCB layout to minimize noise pickup. The wide input range accommodates 24V industrial supplies directly.
Được đề xuất
Medical Instrumentation
The AD780BRZ's high accuracy (±1 mV) and low noise are critical for medical devices like patient monitors and diagnostic equipment. It provides a stable reference for biosignal acquisition chains. The low power consumption extends battery life in portable devices. The temperature output can be used for patient temperature monitoring. Ensure proper isolation and ESD protection in medical designs. The SOIC package is suitable for compact PCB layouts.
Được đề xuất
Portable Test Equipment
For handheld multimeters and calibrators, the AD780BRZ offers a balance of precision and low power. Its 1 mA quiescent current helps maximize battery life. The programmable output (2.5V/3.0V) provides flexibility for different measurement ranges. The device's small SOIC package saves board space. Use a low-dropout regulator to power the reference from a battery, ensuring stable operation as the battery discharges. The noise reduction pin can be used to further lower noise for sensitive measurements.
Được đề xuất
Automotive Electronics
In automotive applications, the AD780BRZ can be used for battery monitoring, motor control, and sensor interfaces. Its wide input range (up to 36V) handles automotive voltage transients. The low drift ensures accuracy over the -40°C to +85°C temperature range. The device is not AEC-Q100 qualified, but it can be used in non-safety-critical systems. For higher reliability, consider using a qualified alternative. Proper EMC filtering is essential in automotive environments.
Được đề xuất
Telecommunications
The AD780BRZ provides a stable reference for communication systems, including base stations and network equipment. Its low noise is essential for maintaining signal integrity in high-speed data converters. The wide input range allows operation from various telecom supply rails (e.g., 12V, 24V). The device's low power consumption is beneficial for densely populated boards. Use proper grounding and shielding to minimize interference. The temperature output can be used for thermal management.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho AD780BRZ — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | AD780BR | LT1019ACS8-2.5 | MAX6126AASA25 |
|---|---|---|---|---|
| Package | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC |
| Brand | Analog Devices | Analog Devices | Analog Devices | Maxim Integrated |
| Output Voltage | 2.5V or 3.0V (programmable) | 2.5V or 3.0V (programmable) | 2.5V (fixed) | 2.5V (fixed) |
| Temperature Coefficient | 3 ppm/°C | 3 ppm/°C | 5 ppm/°C | 3 ppm/°C |
| Noise (0.1-10Hz) | 4 µV p-p | 4 µV p-p | 6 µV p-p | 1.3 µV p-p |
| Quiescent Current | 1 mA max | 1 mA max | 1.5 mA max | 0.5 mA max |
| Input Voltage Range | 4V to 36V | 4V to 36V | 4.5V to 40V | 2.7V to 12.6V |
| Output Current | 10 mA | 10 mA | 10 mA | 10 mA |
Bảo phân biệt quan trọng
- Programmable output voltage (2.5V or 3.0V) (vsLT1019ACS8-2.5)
- Lower temperature coefficient (3 ppm/°C) (vsLT1019ACS8-2.5)
- Wider input voltage range (4V to 36V) (vsMAX6126AASA25)
Ghi chú thiết kế
For optimal performance, place a 0.1µF ceramic capacitor close to the VIN pin and a 1µF capacitor on the VOUT pin. Use a ground plane to minimize noise. The NR pin can be bypassed with a capacitor to reduce noise further. Ensure the SEL pin is tied to the correct logic level for desired output voltage.
The AD780BRZ has low power dissipation, but in high ambient temperatures, ensure the junction temperature stays within limits. The SOIC package has a thermal resistance of approximately 150°C/W. For most applications, no heatsink is required, but adequate copper area on the PCB helps.
Do not exceed the input voltage rating of 36V. Ensure the output is not loaded beyond 10 mA. The SEL pin must be connected to VOUT for 3.0V output or GND for 2.5V output; floating it may cause undefined behavior. Use precision resistors for trimming if needed.
Thông tin tuân thủ
RoHS compliant per ADI product page. Not AEC-Q100 qualified.
