Overview
The AD8251ARMZ-RL, produced by Analog Devices Inc., is a high-performance instrumentation amplifier with digitally programmable gains. It features high input impedance, low output noise, and low distortion, making it ideal for applications requiring precise signal amplification. The AD8251 is fabricated on Analog Devices' proprietary iCMOS process, which ensures precision, linear performance, and a robust digital interface. This amplifier is particularly suited for interfacing with sensors and driving high sample rate analog-to-digital converters (ADCs).
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Gain | 1 | - | 8 | - |
| Bandwidth (G = 1, 2, 4, 8) | 10 MHz | - | 2.5 MHz | MHz |
| Slew Rate | 20 | - | - | V/μs |
| Settling Time (0.01% ΔOUT = 10 V step) | 615 ns | - | 625 ns | ns |
| Common Mode Rejection Ratio (CMRR) to 50 kHz | 80 | - | - | dB |
| Input Noise (G = 8) | 18 | - | - | nV/√Hz |
| Input Offset Drift | 1.8 | - | - | μV/°C |
| Power Supply Range | ±5 V | - | ±15 V | V |
| Quiescent Current | 3.7 | 4.1 | 4.5 | mA |
| Temperature Range | -40 | - | 85 | °C |
Key Features
- Digitally programmable gains of 1, 2, 4, and 8 using a parallel interface.
- High input impedance (GΩ) and low input bias current (5 nA to 30 nA).
- Low output noise (18 nV/√Hz at G = 8) and low distortion (−110 dB THD at 1 kHz, 10 V swing).
- Fast settling time (785 ns to 0.001% for a 10 V step) and high slew rate (20 V/μs).
- High CMRR over frequency (minimum 80 dB to 50 kHz at G = 1).
- Low power consumption (quiescent current of 4.1 mA).
- Wide operating temperature range (−40°C to +85°C).
Applications
- Data acquisition systems.
- Biomedical analysis and medical instrumentation.
- Test and measurement equipment.
- Sensor interfacing and driving high sample rate analog-to-digital converters (ADCs).
Q & A
- What are the programmable gain options for the AD8251?
The AD8251 offers digitally programmable gains of 1, 2, 4, and 8.
- What is the input impedance of the AD8251?
The AD8251 has a high input impedance of GΩ.
- What is the maximum settling time for the AD8251?
The maximum settling time is 785 ns to 0.001% for a 10 V step.
- What is the common mode rejection ratio (CMRR) of the AD8251?
The CMRR is a minimum of 80 dB to 50 kHz at G = 1.
- What is the power supply range for the AD8251?
The power supply range is ±5 V to ±15 V.
- What is the quiescent current of the AD8251?
The quiescent current is 4.1 mA.
- What are the typical applications of the AD8251?
Typical applications include data acquisition, biomedical analysis, test and measurement, and sensor interfacing.
- What is the temperature range for specified performance of the AD8251?
The specified performance temperature range is −40°C to +85°C.
- How does the AD8251 achieve its high CMRR?
The AD8251 achieves high CMRR through its pinout optimized for high CMRR over frequency and the use of distortion cancellation circuitry.
- What is the slew rate of the AD8251?
The slew rate is 20 V/μs.
