ADR421BR

ADR421BR is Analog Devices’ high-precision, fixed-voltage reference IC. It provides a stable reference voltage for precision signal paths, ADCs/DACs, and instrumentation, with low noise and tight accuracy over temperature.
Key features (typical): low noise, very low drift (ppm/°C range), good line/load regulation, and robust performance across a wide supply and temperature range. It usually requires minimal external components (often just a bypass capacitor) and may include short‑circuit protection in some variants.
Typical applications: precision data acquisition, ADC/DAC calibration, instrumentation, and test/measurement equipment.
Package/variant note: BR denotes a RoHS-compliant packaging variant. Exact output voltage, pinout, and electrical specs depend on the specific ADR421BR part; please consult the latest Analog Devices datasheet for the precise nominal voltage, tolerance, temperature coefficient, and recommended usage.

ADR421BR is a precision fixed-output voltage reference. Key features typically include:
- Fixed-output voltage precision for ADC/DAC reference applications
- Low noise and low voltage drift (low tempco)
- Excellent line and load regulation
- Low quiescent current
- Wide operating temperature range
- Short-circuit and over‑temperature protection
- Robust ESD protection
- Pb-free, RoHS-compliant BR package
- Available in compact 8‑lead packages (MSOP/SOIC variants)
- Easy implementation with minimal external circuitry (typically only proper decoupling per datasheet)
Note: exact nominal output voltage and electrical specs vary by device variant; consult the ADR421BR datasheet for precise values.

- Pin count: 8 pins (8-pin package).
- Function: Precision voltage reference with buffered output (typical 2.5 V reference) for analog circuits (e.g., ADC/DAC references). Requires supply to V+ and returns to GND; Vout provides the buffered reference. The remaining pins are generally no-connects (NC) or unused. For exact pin mapping, refer to the ADR421BR datasheet.

- Manufacturer: Analog Devices, Inc. (ADI).
- Company type: A multinational semiconductor company specializing in analog, mixed-signal, and digital signal processing ICs, including precision references and sensors.

- Calibrating and biasing ADCs/DACs in data-acquisition systems
- Precision instrumentation and measurement equipment
- Medical devices and clinical instrumentation
- Industrial process control and instrumentation
- Benchtop test and calibration gear
- Portable, battery-powered equipment requiring low noise and low drift

ADR421BR uses an 8-pin small-outline IC package: SOIC-8.