Overview
The AD8421TRMZ-EP-R7, produced by Analog Devices Inc., is a low-cost, low-power, extremely low noise, and high-speed instrumentation amplifier. It is designed for a broad spectrum of signal conditioning and data acquisition applications. This amplifier features extremely 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.
The AD8421TRMZ-EP-R7 is particularly suited for applications requiring high channel count and multiplexed systems, thanks to its 10 MHz bandwidth, 35 V/μs slew rate, and 0.6 μs settling time to 0.001% at a gain of 10. It also maintains high performance at higher gains, such as 2 MHz bandwidth and 0.8 μs settling time at a gain of 100.
This device is part of the AD8421-EP series, which is enhanced for defense and aerospace applications, adhering to the AQEC standard and specified over the military temperature range of -55°C to +125°C.
Key Specifications
| Parameter | Unit | Min | Typ | Max |
|---|---|---|---|---|
| Supply Current | mA | 2.3 | ||
| Input Voltage Noise | nV/√Hz | 3.2 | ||
| Current Noise | fA/√Hz | 200 | ||
| Bandwidth (G = 1) | MHz | 10 | ||
| Bandwidth (G = 100) | MHz | 2 | ||
| Slew Rate | V/μs | 35 | ||
| Settling Time to 0.001% (G = 10) | μs | 0.6 | ||
| CMRR (G = 1) | dB | 80 | 94 | |
| Input Bias Current | pA | 500 | ||
| Input Offset Voltage Drift | μV/°C | 0.2 | ||
| Gain Drift (G = 1) | ppm/°C | 1 | ||
| Supply Voltage Range | V | ±2.5 to ±18 | ||
| Operating Temperature Range | °C | -55 | 125 |
Key Features
- Extremely low noise: 3.2 nV/√Hz input voltage noise and 200 fA/√Hz current noise.
- High speed: 10 MHz bandwidth at G = 1 and 2 MHz at G = 100.
- Fast settling time: 0.6 μs to 0.001% at G = 10.
- High CMRR: Up to 94 dB at G = 1.
- Low power consumption: Maximum supply current of 2.3 mA.
- Ultralow bias current: 500 pA maximum input bias current.
- Robust input protection: Inputs protected to 40 V from opposite supply rail.
- Gain adjustable with a single resistor: Gain range from 1 to 10,000.
- Precise offset control: Reference pin for applying a precise offset to the output voltage.
- Military temperature range: Specified from -55°C to +125°C.
Applications
- Medical instrumentation
- Precision data acquisition
- Microphone preamplification
- Vibration analysis
- Multiplexed input applications
- ADC driver
- Defense and aerospace applications (AD8421-EP series)
Q & A
- What is the maximum supply current of the AD8421TRMZ-EP-R7?
The maximum supply current is 2.3 mA.
- What is the input voltage noise of the AD8421TRMZ-EP-R7?
The input voltage noise is 3.2 nV/√Hz at 1 kHz.
- What is the bandwidth of the AD8421TRMZ-EP-R7 at a gain of 1?
The bandwidth is 10 MHz at a gain of 1.
- What is the settling time of the AD8421TRMZ-EP-R7 to 0.001% at a gain of 10?
The settling time is 0.6 μs to 0.001% at a gain of 10.
- What is the CMRR of the AD8421TRMZ-EP-R7 at a gain of 1?
The CMRR is up to 94 dB at a gain of 1.
- What is the maximum input bias current of the AD8421TRMZ-EP-R7?
The maximum input bias current is 500 pA.
- How is the gain of the AD8421TRMZ-EP-R7 adjusted?
The gain is adjusted using a single resistor and can range from 1 to 10,000.
- What is the operating temperature range of the AD8421TRMZ-EP-R7?
The operating temperature range is from -55°C to +125°C.
- What types of applications is the AD8421TRMZ-EP-R7 suited for?
The AD8421TRMZ-EP-R7 is suited for medical instrumentation, precision data acquisition, microphone preamplification, vibration analysis, multiplexed input applications, and defense and aerospace applications.
- Does the AD8421TRMZ-EP-R7 have any special protection features?
Yes, the AD8421TRMZ-EP-R7 has input protection that allows input voltages up to 40 V from the opposite supply rail without damage.
