Overview
The AD8476BRMZ, produced by Analog Devices Inc., is a very low power, fully differential precision amplifier designed for driving low power, high performance Analog-to-Digital Converters (ADCs). It operates as a single-ended-to-differential or differential-to-differential amplifier, providing a precision gain of 1, common-mode level shifting, and low temperature drift. The amplifier features rail-to-rail outputs for maximum dynamic range and overvoltage protection up to ±23 V while operating on a dual 5 V supply. With a power dissipation of only 1.5 mW on a single 5 V supply, it is highly efficient for low power applications.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage | ±3 | ±5 | ±18 | V |
| Supply Current (VS = +5 V, TA = 25°C) | 300 | 330 | 400 | μA |
| Supply Current (VS = ±5 V, TA = 25°C) | 330 | 380 | 500 | μA |
| Output Offset | 200 | μV | ||
| Noise (at 10 kHz) | 39 | nV/√Hz | ||
| THD + N (at 10 kHz) | -102 | dB | ||
| Temperature Range | -40 | 125 | °C | |
| Package | 8-Lead MSOP |
Key Features
- Low Power Consumption: The AD8476 operates with a supply current of 330 μA on a single 5 V supply, making it highly efficient for low power applications.
- High Precision: Features a maximum output offset of 200 μV, 39 nV/√Hz noise, and -102 dB THD + N at 10 kHz, making it suitable for high accuracy converters.
- Fully Differential Operation: Designed to drive precision ADCs with differential inputs, and can handle both single-ended and differential input signals.
- Overvoltage Protection: Protects against large industrial input voltages up to ±23 V while operating on a dual 5 V supply.
- Common-Mode Level Shifting: Allows the user to set the output common-mode voltage to match the input range of the ADC.
- Space-Saving Package: Available in an 8-lead MSOP package, making it suitable for compact designs.
Applications
- Driving ADCs: Ideal for driving low power, high performance ADCs such as SAR, Σ-Δ, and pipeline converters.
- Industrial and Medical Devices: Suitable for applications requiring high precision and low power consumption, such as in industrial and medical devices.
- Signal Conditioning: Used in signal conditioning circuits where precision and low noise are critical).
Q & A
- What is the primary function of the AD8476?
The AD8476 is a fully differential precision amplifier designed to drive low power, high performance ADCs, providing single-ended-to-differential or differential-to-differential conversion).
- What is the power consumption of the AD8476?
The AD8476 operates with a supply current of 330 μA on a single 5 V supply, resulting in a power dissipation of only 1.5 mW).
- What are the key specifications of the AD8476 in terms of noise and distortion?
The AD8476 features 39 nV/√Hz noise and -102 dB THD + N at 10 kHz).
- What types of ADCs can the AD8476 drive?
The AD8476 can drive SAR, Σ-Δ, and pipeline converters).
- What is the temperature range for the AD8476?
The AD8476 is fully specified over the -40°C to +125°C temperature range).
- What package options are available for the AD8476?
The AD8476 is available in an 8-lead MSOP package and 16-lead LFCSP packages).
- Does the AD8476 provide overvoltage protection?
Yes, the AD8476 provides overvoltage protection up to ±23 V while operating on a dual 5 V supply).
- How does the AD8476 handle common-mode level shifting?
The AD8476 allows the user to set the output common-mode voltage to match the input range of the ADC using the VOCM input).
- What is the significance of the VOCM input in the AD8476?
The VOCM input allows the user to set the output common-mode voltage, which is crucial for matching the input range of the ADC).
- Can the AD8476 be used in industrial applications?
Yes, the AD8476 is suitable for industrial applications due to its high precision, low power consumption, and overvoltage protection features).
