Overview
The AD8421BRMZ from Analog Devices Inc. is a low-power, high-performance instrumentation amplifier designed for a wide range of signal conditioning and data acquisition applications. It is known for its low noise, ultra-low bias current, and high speed, making it ideal for precise and reliable signal amplification. The amplifier is available in various packages, including 8-lead MSOP, 8-lead SOIC, and 8-lead LFCSP, and is specified to operate from −40°C to +85°C for MSOP and SOIC packages, and from −40°C to +125°C for the LFCSP package.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Bandwidth (G = 1) | 10 | MHz |
| Bandwidth (G = 100) | 2 | MHz |
| Settling Time to 0.001% (G = 10) | 0.6 | µs |
| CMRR at 20 kHz (G = 1) | 80 | dB |
| Slew Rate | 35 | V/µs |
| Input Voltage Noise at 1 kHz | 3.2 | nV/√Hz |
| Input Bias Current | 500 | pA |
| Input Offset Voltage Drift | 0.2 | µV/°C |
| Gain Drift (G = 1) | 1 | ppm/°C |
| Supply Voltage Range | ±2.5 V to ±18 V (dual supply), 5 V to 36 V (single supply) | V |
| Maximum Supply Current | 2.3 | mA |
| Input Protection | Up to 40 V from opposite supply rail | V |
Key Features
- Low power consumption with a maximum supply current of 2.3 mA.
- Extremely low noise with 3.2 nV/√Hz input voltage noise and 200 fA/√Hz current noise at 1 kHz.
- Ultra-low bias current of 500 pA maximum.
- High speed capabilities with a 10 MHz bandwidth at G = 1 and a 35 V/µs slew rate.
- High precision DC performance with a maximum input offset voltage drift of 0.2 µV/°C and a maximum gain drift of 1 ppm/°C (G = 1)).
- Inputs protected up to 40 V from the opposite supply rail).
- Gain settable with a single resistor from 1 to 10,000).
- Available in 8-lead LFCSP, 8-lead MSOP, and 8-lead SOIC packages).
Applications
- Medical instrumentation).
- Precision data acquisition).
- Microphone preamplification).
- Vibration analysis).
- Multiplexed input applications).
- ADC driver).
Q & A
- What is the bandwidth of the AD8421 at a gain of 1?
The bandwidth of the AD8421 at a gain of 1 is 10 MHz).
- What is the maximum input bias current of the AD8421?
The maximum input bias current of the AD8421 is 500 pA).
- What is the input voltage noise of the AD8421 at 1 kHz?
The input voltage noise of the AD8421 at 1 kHz is 3.2 nV/√Hz).
- What is the slew rate of the AD8421?
The slew rate of the AD8421 is 35 V/µs).
- What is the temperature range for the AD8421 in MSOP and SOIC packages?
The temperature range for the AD8421 in MSOP and SOIC packages is from −40°C to +85°C).
- How is the gain of the AD8421 set?
The gain of the AD8421 is set with a single resistor and can range from 1 to 10,000).
- What are the typical applications of the AD8421?
The AD8421 is typically used in medical instrumentation, precision data acquisition, microphone preamplification, vibration analysis, multiplexed input applications, and as an ADC driver).
- What is the maximum supply voltage range for the AD8421?
The maximum supply voltage range for the AD8421 is ±2.5 V to ±18 V (dual supply) and 5 V to 36 V (single supply)).
- How is the input protection of the AD8421?
The inputs of the AD8421 are protected up to 40 V from the opposite supply rail).
- What is the warranty period for the AD8421BRMZ-R7 from Ovaga?
Ovaga offers a 1-year warranty on the AD8421BRMZ-R7, covering any defects in materials and workmanship under normal use).
