Overview
The AD8251ARMZ-R7, produced by Analog Devices Inc., is an instrumentation amplifier with digitally programmable gains. It features high input impedance (GΩ), low output noise, and low distortion, making it suitable for interfacing with sensors and driving high sample rate analog-to-digital converters (ADCs). The amplifier boasts a high bandwidth of 10 MHz, a low total harmonic distortion (THD) of −110 dB, and a fast settling time of 785 ns to 0.001%. It is available in a compact 10-lead MSOP package and operates over a temperature range of −40°C to +85°C, making it ideal for applications where size and packing density are critical.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| No. of Channels | 1 | - |
| Programmable Gains | 1, 2, 4, 8 | - |
| Supply Voltage Range | ±5 V to ±15 V | V |
| No. of Pins | 10 | - |
| IC Case / Package | MSOP | - |
| Operating Temperature Range | −40°C to +85°C | °C |
| Common Mode Rejection Ratio (CMRR) | 98 dB (minimum), G = 8 | dB |
| Gain Drift | 10 ppm/°C (maximum) | ppm/°C |
| Offset Drift | 1.8 μV/°C (maximum), G = 8 | μV/°C |
| Slew Rate | 20 V/μs (minimum) | V/μs |
| Settling Time | 785 ns to 0.001% (maximum) | ns |
| Total Harmonic Distortion (THD) | −110 dB at 1 kHz, 10 V swing | dB |
| Noise | 18 nV/√Hz, G = 8 (maximum) | nV/√Hz |
| Quiescent Current | 4.1 mA | mA |
Key Features
- Digital or Pin-Programmable Gain Setting: The gain can be set using a 2-bit word via a bus or through transparent gain mode based on logic levels at the gain port.
- Excellent DC Performance: High CMRR of 98 dB (minimum) at G = 8, low gain drift of 10 ppm/°C, and low offset drift of 1.8 μV/°C.
- High Speed Capabilities: Fast settling time of 785 ns to 0.001%, high slew rate of 20 V/μs, and low distortion of −110 dB THD at 1 kHz.
- Low Noise and Power Consumption: Low noise of 18 nV/√Hz at G = 8 and low power consumption of 4.1 mA.
- Compact Package: Available in a 10-lead MSOP package, suitable for applications where size and packing density are important.
Applications
- Data Acquisition: Ideal for interfacing with sensors and driving high sample rate analog-to-digital converters (ADCs).
- Biomedical Analysis: Suitable for applications requiring high precision and low noise.
- Test and Measurement: Used in various test and measurement instruments due to its high accuracy and speed.
Q & A
- What are the programmable gain settings of the AD8251?
The AD8251 has 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 operating temperature range of the AD8251?
The AD8251 operates over a temperature range of −40°C to +85°C.
- What is the common-mode rejection ratio (CMRR) of the AD8251?
The CMRR of the AD8251 is 98 dB (minimum) at G = 8.
- How does the gain setting work on the AD8251?
The gain can be set using a 2-bit word via a bus or through transparent gain mode based on logic levels at the gain port.
- What is the slew rate of the AD8251?
The slew rate of the AD8251 is 20 V/μs (minimum).
- What is the total harmonic distortion (THD) of the AD8251?
The THD of the AD8251 is −110 dB at 1 kHz, 10 V swing.
- What is the noise level of the AD8251?
The noise level of the AD8251 is 18 nV/√Hz at G = 8 (maximum).
- What is the power consumption of the AD8251?
The quiescent current of the AD8251 is 4.1 mA.
- In what package is the AD8251 available?
The AD8251 is available in a 10-lead MSOP package.
