Overview
The AD8421BRZ-R7, produced by Analog Devices Inc., is a low-cost, low-power, extremely low-noise, ultralow bias current, high-speed instrumentation amplifier. It is ideally suited for a broad spectrum of signal conditioning and data acquisition applications. This amplifier features high common-mode rejection ratio (CMRR), allowing it to extract low-level signals in the presence of high-frequency common-mode noise over a wide temperature range.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Input Voltage Noise | 3.2 | nV/√Hz at 1 kHz | ||
| Input Current Noise | 200 | fA/√Hz at 1 kHz | ||
| Bandwidth | 10 | 10 | MHz (G = 1) | |
| Slew Rate | 35 | V/µs | ||
| Settling Time to 0.001% | 0.6 | 0.6 | µs (G = 10) | |
| CMRR | 94 | dB (G = 1) | ||
| Input Offset Voltage Drift | 0.2 | µV/°C | ||
| Gain Drift | 1 | ppm/°C (G = 1) | ||
| Input Bias Current | 500 | pA | ||
| Supply Voltage | ±2.5 | ±18 | V (dual supply), 5 V to 36 V (single supply) | |
| Package Types | 8-lead LFCSP, 8-lead MSOP, 8-lead SOIC |
Key Features
- Low power consumption with a maximum supply current of 2.3 mA.
- Extremely low noise: 3.2 nV/√Hz input voltage noise and 200 fA/√Hz current noise at 1 kHz.
- High-speed performance: 10 MHz bandwidth (G = 1), 2 MHz bandwidth (G = 100), and 0.6 µs settling time to 0.001% (G = 10).
- High CMRR: 94 dB minimum at G = 1, allowing for the extraction of low-level signals in high-frequency common-mode noise.
- Low input bias current: 500 pA maximum.
- Input protection up to 40 V from the opposite supply rail.
- Gain settable with a single resistor from 1 to 10,000.
- Reference pin for precise output voltage offset.
Applications
- Medical instrumentation
- Precision data acquisition
- Microphone preamplification
- Vibration analysis
- Multiplexed input applications
- ADC driver
Q & A
- What is the typical input voltage noise of the AD8421BRZ-R7?
The typical input voltage noise is 3.2 nV/√Hz at 1 kHz.
- What is the maximum input bias current of the AD8421BRZ-R7?
The maximum input bias current is 500 pA.
- What is the CMRR of the AD8421BRZ-R7 at a gain of 1?
The CMRR is 94 dB minimum at a gain of 1.
- What is the settling time to 0.001% for the AD8421BRZ-R7 at a gain of 10?
The settling time is 0.6 µs.
- What are the available package types for the AD8421BRZ-R7?
The available package types are 8-lead LFCSP, 8-lead MSOP, and 8-lead SOIC.
- What is the operating supply voltage range for the AD8421BRZ-R7?
The operating supply voltage range is ±2.5 V to ±18 V (dual supply) and 5 V to 36 V (single supply).
- How is the gain set for the AD8421BRZ-R7?
The gain is settable with a single resistor from 1 to 10,000.
- What are some typical applications of the AD8421BRZ-R7?
Typical applications include medical instrumentation, precision data acquisition, microphone preamplification, vibration analysis, multiplexed input applications, and ADC drivers.
- What is the maximum slew rate of the AD8421BRZ-R7?
The maximum slew rate is 35 V/µs.
- Does the AD8421BRZ-R7 have input protection?
Yes, the inputs are protected up to 40 V from the opposite supply rail.
