AD780BRZ - 2.5V/3.0V High Precision Reference | Analog Devices
MPN: AD780BRZ ✓ NakahandaAD780BRZ Ulas
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.
Mga alternatibo na pwedeng ilagay na AD780BRZ — parehas na package, pin-to-pin na katugmang. Hindi kasama ang mga bahagi ng iba't-ibang package na nangangailangan ng pagpapaayos ng PCB.
Variante sa Seri na ito
Katulad na modelo sa serye na katugma sa pagpasok AD780BRZ (parehas na form factor at footprint) — pagkakaiba sa Output Current, Output Voltage, Package, Temperature Coefficient, Input Voltage Range.
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Tingnan ang Datasheet →LT1019ACS8-2.5
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AD780BRZ Mga Pinakamataas na Rating at Electrical Characteristics
| Reference Type | Series, Shunt, Programmable |
| Output Volte | ±2.5V, ±3V |
| Tolerance | ±1 mV |
| Temperature Coefficient | 3 ppm/°C |
| Hanay ng Voltage ng Input | 4 V ~ 36 V |
| Output Current | 10 mA |
| Noise | 100 nV/√Hz |
| Kuru-kuryente ng Kapayapaan | 1 mA max |
| Hanay ng Temperature na Operasyon | -40°C to +85°C |
| Packhaging | 8-SOIC |
| Uri ng Pagpapasok | Surface Mount |
| Number of Channels | 1 |
| Long-term Stability | Noncumulative |
| Tindminan RoHS | Compliant |
| Katayuan ng Lifecycle | Production |
Pin Configuration ng AD780BRZ
| Pin 1 | VIN — Input supply voltage (4V to 36V) |
| Pin 2 | VOUT — Reference output (2.5V or 3.0V) |
| Pin 3 | GND — Ground |
| Pin 4 | TRIM — Output voltage trim |
| Pin 5 | TEMP — Temperature output |
| Pin 6 | NR — Noise reduction |
| Pin 7 | SEL — Output voltage select (2.5V/3.0V) |
| Pin 8 | NC — No connect |
Tipikal na mga Gamit
AD780BRZ ay nararapat para sa 6 aplikasyons: 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.
Inirekomenda
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.
Inirekomenda
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.
Inirekomenda
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.
Inirekomenda
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.
Inirekomenda
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.
Inirekomenda
Buod ng mga Inirekomendang Produkto
Impormasyon ng Talumpati sa Engineering for AD780BRZ — ikabit, gabay sa disenyo, at impormasyon ng pagsunod sa kautusan.
Paunawang Hanapin
Ikabit sa Mga Alternatibo
| Parametro | Ito ang Producto | 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 |
Pangunahing mga Pagkakaiba
- Programmable output voltage (2.5V or 3.0V) (kumpara saLT1019ACS8-2.5)
- Lower temperature coefficient (3 ppm/°C) (kumpara saLT1019ACS8-2.5)
- Wider input voltage range (4V to 36V) (kumpara saMAX6126AASA25)
Talaan ng Disenyo
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.
Impormasyon ng Pagsunod sa Kautusan
RoHS compliant per ADI product page. Not AEC-Q100 qualified.
