Overview
The AD8475ARMZ, produced by Analog Devices Inc., is a precision, fully differential, attenuating amplifier designed to interface industrial-level signals with low-voltage, high-performance analog-to-digital converters (ADCs). This amplifier integrates precision gain resistors and offers selectable gain options, making it a versatile component for various applications. It operates on a single supply voltage ranging from 3 V to 10 V or dual supplies from ±1.5 V to ±5 V, and it is fully specified over the temperature range of −40°C to +85°C.
Key Specifications
| Parameter | Value |
|---|---|
| Supply Voltage | 3 V to 10 V (single supply), ±1.5 V to ±5 V (dual supplies) |
| Gain Options | 0.4, 0.8 (pin-selectable) |
| Input Voltage Range | Up to ±10 V |
| Output Noise | 10 nV/√Hz |
| Gain Drift | 3 ppm/°C |
| Output Offset | 500 μV maximum |
| Slew Rate | 50 V/μs |
| Supply Current | 3.2 mA |
| Overvoltage Protection | Up to ±15 V (VS = +5 V) |
| Package Options | 10-Lead MSOP, 16-Lead LFCSP |
Key Features
- Precision attenuation (by 0.4 or 0.8) and common-mode level shifting.
- Single-ended-to-differential conversion.
- Overvoltage protection up to ±15 V while operating on a single 5 V supply.
- Low power consumption with 16 mW power dissipation on a single 5 V supply.
- High precision with 10 nV/√Hz output noise and −112 dB THD + N.
- Adjustable output voltage common mode via the VOCM pin to match the ADC’s input range and maximize dynamic range.
- High current output stage suitable for driving the switched capacitor front-end circuits of many ADCs.
Applications
- ADC drivers for high-performance 16-bit or 18-bit successive approximation (SAR) analog-to-digital converters.
- Differential instrumentation amplifier building blocks.
- Single-ended-to-differential converters.
- Industrial signal processing where compatibility with low-voltage ADCs is required.
Q & A
- What are the gain options available for the AD8475? The AD8475 offers two standard pin-selectable gain options: 0.4 and 0.8.
- What is the input voltage range of the AD8475? The AD8475 can handle input voltages up to ±10 V.
- What is the output noise of the AD8475? The output noise is 10 nV/√Hz.
- Does the AD8475 provide overvoltage protection? Yes, it provides overvoltage protection up to ±15 V while operating on a single 5 V supply.
- What are the package options for the AD8475? The AD8475 is available in 10-Lead MSOP and 16-Lead LFCSP packages.
- What is the power consumption of the AD8475? The power dissipation on a single 5 V supply is only 16 mW.
- Can the AD8475 drive high-performance ADCs? Yes, it is designed to drive 18-bit converters up to 4 MSPS and works well with SAR, Σ-Δ, and pipeline converters.
- How does the AD8475 adjust the output voltage common mode? The output voltage common mode can be adjusted via the VOCM pin to match the ADC’s input range and maximize dynamic range.
- What is the slew rate of the AD8475? The slew rate is 50 V/μs.
- Is the AD8475 suitable for industrial applications? Yes, it is designed to process industrial-level signals and make them compatible with low-voltage, high-performance ADCs.
