Overview
The AD8421TRMZ-EP, 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 is particularly suited for applications requiring high channel count and multiplexed systems due to its high bandwidth and fast settling time.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Current | - | 2.3 | - | mA |
| Input Voltage Noise at 1 kHz | - | 3.2 | - | nV/√Hz |
| Current Noise at 1 kHz | - | 200 | - | fA/√Hz |
| Bandwidth (G = 1) | - | 10 | - | MHz |
| Bandwidth (G = 100) | - | 2 | - | MHz |
| Settling Time to 0.001% (G = 10) | - | 0.6 | - | μs |
| CMRR (G = 1) to 20 kHz | 80 | - | - | dB |
| Slew Rate | - | 35 | - | V/μs |
| Input Bias Current | - | 1 | - | nA |
| Input Offset Voltage | - | 70 | - | μV |
| Supply Voltage Range (Dual) | ±2.5 | - | ±18 | V |
| Supply Voltage Range (Single) | 5 | - | 36 | V |
| Operating Temperature Range | -55 | - | 125 | °C |
Key Features
- 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 at G = 1 and 2 MHz bandwidth 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 input bias current: 1 nA maximum.
- Robust input protection: Input voltages up to 40 V from the opposite supply rail without damage.
- Gain set by a single resistor: Gain range from 1 to 10,000.
- Reference pin for precise output offset.
- Low power consumption: 2.3 mA maximum supply current.
- Military temperature range: -55°C to +125°C for the AD8421TRMZ-EP model.
Applications
- Medical instrumentation
- Precision data acquisition
- Microphone preamplification
- Vibration analysis
- Multiplexed input applications
- ADC driver
- Defense and aerospace applications (AD8421-EP model)
Q & A
- What is the maximum input voltage noise of the AD8421TRMZ-EP at 1 kHz?
The maximum input voltage noise is 3.2 nV/√Hz at 1 kHz.
- What is the bandwidth of the AD8421TRMZ-EP at a gain of 1?
The bandwidth is 10 MHz at a gain of 1.
- What is the settling time of the AD8421TRMZ-EP 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 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?
The maximum input bias current is 1 nA.
- How is the gain of the AD8421TRMZ-EP set?
The gain is set by a single resistor and can range from 1 to 10,000.
- What is the operating temperature range of the AD8421TRMZ-EP?
The operating temperature range is -55°C to +125°C.
- What are the supply voltage ranges for the AD8421TRMZ-EP?
The supply voltage ranges are ±2.5 V to ±18 V for dual supply and 5 V to 36 V for single supply.
- What is the slew rate of the AD8421TRMZ-EP?
The slew rate is 35 V/μs.
- What are some typical applications of the AD8421TRMZ-EP?
Typical applications include medical instrumentation, precision data acquisition, microphone preamplification, vibration analysis, and multiplexed input applications.
