Overview
The AD8429BRZ, produced by Analog Devices Inc., is an ultralow noise instrumentation amplifier designed for measuring extremely small signals over a wide temperature range. It excels in applications requiring high accuracy and low noise, making it ideal for various precision measurement tasks. The AD8429BRZ delivers ultralow input noise performance of 1 nV/√Hz and features high common-mode rejection ratio (CMRR) to prevent unwanted signals from corrupting the signal acquisition. It is available in an 8-lead plastic SOIC package and operates over an extended industrial temperature range of −40°C to +125°C.
Key Specifications
| Parameter | Typical Value | Unit |
|---|---|---|
| Input Noise | 1 nV/√Hz | nV/√Hz |
| Output Noise | 45 nV/√Hz | nV/√Hz |
| CMRR (G = 1) | 90 dB | dB |
| Input Offset Voltage | 50 μV | μV |
| Gain Accuracy (G = 1) | 0.02% | % |
| Bandwidth (G = 1) | 15 MHz | MHz |
| Bandwidth (G = 100) | 1.2 MHz | MHz |
| Slew Rate | 22 V/μs | V/μs |
| Supply Voltage Range | ±4 V to ±18 V | V |
| Operating Temperature Range | −40°C to +125°C | °C |
| Package Type | 8-Lead SOIC |
Key Features
- Ultralow input noise of 1 nV/√Hz and output noise of 45 nV/√Hz.
- High accuracy DC performance with a maximum input offset voltage of 50 μV and 0.02% maximum gain accuracy (G = 1).
- Excellent AC specifications, including 90 dB CMRR at G = 1 and 80 dB CMRR up to 5 kHz.
- High bandwidth of 15 MHz at G = 1 and 1.2 MHz at G = 100.
- Fast slew rate of 22 V/μs and low total harmonic distortion (THD) of −130 dBc at 1 kHz, G = 1.
- Versatile gain setting with a single resistor, allowing gains from 1 to 10,000.
- A reference pin to offset the output voltage, useful for interfacing to single-supply signal chains.
- Current feedback architecture for high bandwidth at high gain.
- Circuitry to improve settling time after large input voltage transients.
Applications
- Medical instrumentation: Ideal for precise signal measurement in medical devices.
- Precision data acquisition: Suitable for high-accuracy data acquisition systems.
- Microphone preamplification: Offers low noise and high gain for microphone signal amplification.
- Vibration analysis: Excellent distortion performance makes it suitable for vibration analysis applications.
Q & A
- What is the input noise of the AD8429BRZ?
The AD8429BRZ has an ultralow input noise of 1 nV/√Hz.
- What is the maximum input offset voltage of the AD8429BRZ?
The maximum input offset voltage is 50 μV.
- What is the common-mode rejection ratio (CMRR) of the AD8429BRZ at G = 1?
The CMRR at G = 1 is 90 dB.
- What is the bandwidth of the AD8429BRZ at G = 1 and G = 100?
The bandwidth is 15 MHz at G = 1 and 1.2 MHz at G = 100.
- What is the slew rate of the AD8429BRZ?
The slew rate is 22 V/μs.
- What is the operating temperature range of the AD8429BRZ?
The operating temperature range is −40°C to +125°C.
- How is the gain set in the AD8429BRZ?
The gain is set with a single resistor, allowing gains from 1 to 10,000.
- What is the purpose of the reference pin in the AD8429BRZ?
The reference pin allows the user to offset the output voltage, which is useful for interfacing to single-supply signal chains.
- What are some typical applications of the AD8429BRZ?
Typical applications include medical instrumentation, precision data acquisition, microphone preamplification, and vibration analysis.
- What package type is the AD8429BRZ available in?
The AD8429BRZ is available in an 8-lead plastic SOIC package.
