Overview
The AD8476ARMZ, produced by Analog Devices Inc., is a very low power, fully differential precision amplifier designed with integrated gain resistors for unity gain. This amplifier is ideal for driving low power, high performance Analog-to-Digital Converters (ADCs) as either a single-ended-to-differential or differential-to-differential amplifier. It offers precision gain, common-mode level shifting, low temperature drift, and rail-to-rail outputs to maximize dynamic range. The AD8476 is particularly suited for applications requiring high accuracy and low power consumption, making it a versatile component in various signal processing systems.
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 |
| Operating Temperature Range | -40 | - | +125 | °C |
| Output Offset Voltage | - | - | 200 | μV |
| Noise (at 1 kHz) | - | 39 | - | nV/√Hz |
| Total Harmonic Distortion + Noise (THD + N) at 10 kHz | - | - | -102 | dB |
| Slew Rate | - | 10 | - | V/us |
| -3 dB Bandwidth (G = 1) | - | 6 | - | MHz |
Key Features
- Low Power Consumption: The AD8476 operates with a supply current of 330 μA on a single 5 V supply, making it highly energy-efficient.
- High Precision: Features a maximum output offset of 200 μV, 39 nV/√Hz noise, and -102 dB THD + N at 10 kHz, ensuring high accuracy in signal processing.
- Fully Differential Operation: Supports both single-ended-to-differential and differential-to-differential conversions, making it versatile for various ADC driving applications.
- Overvoltage Protection: Protects against large industrial input voltages up to ±23 V while operating on a dual 5 V supply.
- Compact Packaging: Available in space-saving 8-lead MSOP and 16-lead LFCSP packages, suitable for dense PCB designs.
- Wide Temperature Range: Fully specified over the -40°C to +125°C temperature range, ensuring reliability in diverse environmental conditions.
Applications
The AD8476 is designed to drive low power, high performance ADCs, including SAR, Σ-Δ, and pipeline converters. It is particularly useful in applications requiring precision signal processing, such as:
- High Accuracy Data Acquisition Systems: Where low noise and high precision are critical.
- Industrial Automation: For driving ADCs in industrial control systems that require robust and reliable signal processing.
- Medical Devices: In medical equipment where precise signal conversion is essential.
- Aerospace and Defense: For applications demanding high reliability and precision over a wide temperature range.
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 with integrated gain resistors for unity gain.
- What are the key specifications of the AD8476 in terms of power consumption?
The AD8476 operates with a supply current of 330 μA on a single 5 V supply and 380 μA on a dual 5 V supply.
- What is the maximum output offset voltage of the AD8476?
The maximum output offset voltage is 200 μV.
- What types of ADCs can the AD8476 drive?
The AD8476 can drive SAR, Σ-Δ, and pipeline converters.
- What is the temperature range over which the AD8476 is fully specified?
The AD8476 is fully specified over the -40°C to +125°C temperature range.
- What are the available package options for the AD8476?
The AD8476 is available in 8-lead MSOP and 16-lead LFCSP packages.
- Does the AD8476 offer overvoltage protection?
Yes, it provides overvoltage protection from large industrial input voltages up to ±23 V.
- What is the slew rate of the AD8476?
The slew rate is 10 V/us.
- What is the -3 dB bandwidth of the AD8476?
The -3 dB bandwidth is 6 MHz.
- How does the AD8476 handle noise and distortion?
The AD8476 features 39 nV/√Hz noise and -102 dB THD + N at 10 kHz, ensuring high signal integrity.
