## Technical Overview of ADR3420ARJZ-R7 The **ADR3420ARJZ-R7** is a high-precision, low-power, low-noise **CMOS Voltage Reference** manufactured by Analog Devices. It is specifically designed for high-accuracy data acquisition systems where stability and space are critical. --- ### 1. Key Technical Specifications | Parameter | Value / Specification | | :--- | :--- | | **Output Voltage ($V_{out}$)** | 2.048 V | | **Initial Accuracy** | ±0.1% (Max) | | **Temperature Coefficient** | 8 ppm/°C (Max) | | **Input Voltage Range** | 2.3 V to 5.5 V | | **Operating Current** | 100 µA (Max) | | **Output Current Capability** | 10 mA (Source) / -3 mA (Sink) | | **Package Type** | SOT-23-6 | | **Operating Temperature** | -40°C to +125°C | --- ### 2. Core Functional Features * **High Precision:** The 2.048 V output is ideal for 12-bit and 16-bit Analog-to-Digital Converters (ADCs), as it simplifies the calculation of the Least Significant Bit (LSB). * **Low Quiescent Current:** At only 100 µA maximum, it is highly suitable for battery-powered or portable electronics. * **Low Noise:** It features low wideband noise, reducing the need for heavy external filtering in sensitive signal chains. * **Shutdown Pin:** Includes a "Shut Down" (SD) pin which reduces power consumption even further when the reference is not needed. --- ### 3. Pin Configuration The ADR3420ARJZ-R7 typically uses a 6-lead SOT-23 package. | Pin Number | Name | Description | | :--- | :--- | :--- | | 1 | **NC** | No Internal Connection | | 2 | **GND** | Ground | | 3 | **SD** | Shutdown (Active Low) | | 4 | **$V_{in}$** | Input Voltage Supply | | 5 | **NC** | No Internal Connection | | 6 | **$V_{out}$** | Reference Voltage Output (2.048 V) | --- ### 4. Typical Application Circuit To ensure stability, a decoupling capacitor is required at the input and output. ```spice * Basic Connection Diagram Vin ---[ 0.1uF Capacitor to GND ]--- Pin 4 (Vin) GND -------------------------------- Pin 2 (GND) Vout ---[ 0.1uF to 10uF Cap to GND ]- Pin 6 (Vout) SD ---[ Logic High ]--------------- Pin 3 (Enable) ``` --- ### 5. Common Applications 1. **Precision Data Acquisition:** Providing the reference for high-resolution ADCs and DACs. 2. **Portable Instrumentation:** Due to its small footprint and low power consumption. 3. **Industrial Process Control:** Used in PLC modules and sensor transmitters. 4. **Medical Equipment:** Monitoring devices requiring high thermal stability.