Overview
The AD8421BRMZ-RL, produced by Analog Devices Inc., is a high-performance, low-power instrumentation amplifier. It is designed to offer extremely low noise, ultralow bias current, and high speed, making it ideal for a broad spectrum of signal conditioning and data acquisition applications. The AD8421 is available in an 8-lead MSOP package and is specified to operate from −40°C to +85°C.
Key Specifications
| Parameter | Unit | Min | Typ | Max |
|---|---|---|---|---|
| Small Signal Bandwidth (−3 dB) | MHz | 10 (G = 1) | 10 (G = 1) | 10 (G = 1) |
| Settling Time to 0.001% | µs | 0.6 (G = 10) | 0.6 (G = 10) | 0.6 (G = 10) |
| CMRR | dB | 80 (G = 1, 20 kHz) | 94 (G = 1, min) | |
| Slew Rate | V/µs | 35 | 35 | 35 |
| Input Offset Voltage Drift | µV/°C | 0.2 | 0.2 | 0.2 |
| Gain Drift | ppm/°C | 1 (G = 1) | 1 (G = 1) | 1 (G = 1) |
| Input Bias Current | pA | 500 | 500 | 500 |
| Supply Voltage Range | V | ±2.5 to ±18 (dual), 5 to 36 (single) | ||
| Gain Range | 1 to 10,000 |
Key Features
- Low power consumption with a maximum supply current of 2.3 mA
- Extremely low noise: 3 nV/√Hz input voltage noise and 200 fA/√Hz current noise at 1 kHz
- High speed performance: 10 MHz bandwidth at G = 1 and 2 MHz bandwidth at G = 100
- Fast settling time: 0.6 µs to 0.001% at G = 10
- High common-mode rejection ratio (CMRR): up to 94 dB at G = 1
- Low input offset voltage drift: 0.2 µV/°C
- Low gain drift: 1 ppm/°C at G = 1
- Input protection 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, MSOP, and SOIC packages
Applications
- Medical instrumentation
- Precision data acquisition
- Microphone preamplification
- Vibration analysis
- Multiplexed input applications
- ADC driver
Q & A
- What is the operating temperature range of the AD8421BRMZ-RL?
The AD8421BRMZ-RL operates from −40°C to +85°C.
- What is the maximum supply current of the AD8421?
The maximum supply current is 2.3 mA.
- What is the input voltage noise of the AD8421?
The input voltage noise is 3 nV/√Hz at 1 kHz.
- What is the common-mode rejection ratio (CMRR) of the AD8421?
The CMRR is up to 94 dB at G = 1.
- How is the gain set on the AD8421?
The gain is settable with a single resistor from 1 to 10,000).
- What are the typical applications of the AD8421?
Typical applications include medical instrumentation, precision data acquisition, microphone preamplification, vibration analysis, and multiplexed input applications).
- What is the slew rate of the AD8421?
The slew rate is 35 V/µs).
- What is the maximum input bias current of the AD8421?
The maximum input bias current is 500 pA).
- What is the settling time of the AD8421 to 0.001% at G = 10?
The settling time is 0.6 µs to 0.001% at G = 10).
- What are the available package types for the AD8421?
The AD8421 is available in 8-lead LFCSP, MSOP, and SOIC packages).
- How is the input protection of the AD8421?
The inputs are protected up to 40 V from the opposite supply rail).
