Overview
The AD8512AR-REEL7, produced by Analog Devices Inc., is a dual-precision JFET operational amplifier. It is part of the AD8510/AD8512/AD8513 family, known for its low offset voltage, low input bias current, and low input voltage noise. These characteristics make the AD8512 particularly suitable for high impedance sensor amplification, precise current measurements using shunts, and applications requiring high accuracy and low noise.
The amplifier is designed to maintain fast settling performance even with substantial capacitive loads and does not suffer from output phase reversal when input voltages exceed the maximum common-mode voltage range. This makes it an excellent choice for high-performance filters, medical instruments, electronic measurement, and automated test equipment.
Key Specifications
| Parameter | Symbol | Conditions | Min | Max | Unit | |
|---|---|---|---|---|---|---|
| Offset Voltage (A Grade) | VOS | −40°C < TA < +125°C | 0.1 | 0.9 | 1.8 | mV |
| Input Bias Current | IB | −40°C < TA < +125°C | 21 | 75 | 7.5 | pA |
| Input Offset Current | IOS | −40°C < TA < +125°C | 5 | 50 | 0.5 | pA |
| Input Capacitance (Differential) | 12.5 | pF | ||||
| Common-Mode Rejection Ratio | CMRR | VCM = −2.0 V to +2.5 V | 86 | 100 | dB | |
| Output Voltage High | VOH | RL = 600 Ω, −40°C < TA < +125°C | +3.7 | +4.1 | V | |
| Output Voltage Low | VOL | RL = 600 Ω, −40°C < TA < +125°C | −4.8 | −4.2 | V | |
| Output Current | IOUT | ±40 | ±54 | mA | ||
| Supply Current/Amplifier | ISY | VO = 0 V, −40°C < TA < +125°C | 2.0 | 2.3 | 2.5 | mA |
| Slew Rate | SR | RL = 2 kΩ | 20 | V/μs | ||
| Gain Bandwidth Product | GBP | 8 | MHz | |||
| Settling Time (0.1% to 4 V step, G = +1) | tS | 0.4 | μs | |||
| Total Harmonic Distortion + Noise (1 kHz, G = +1, RL = 2 kΩ) | THD + N | 0.0005% | % |
Key Features
- Low Offset Voltage and Drift: The AD8512 features low offset voltage and drift, making it suitable for precise applications.
- Low Input Bias Current: Very low input bias currents enhance its performance in high impedance sensor amplification and current measurements.
- Low Noise: Low input voltage noise ensures high accuracy and stability in various applications.
- Fast Settling Time and Slew Rate: Fast settling time and high slew rate make it ideal for high-speed and high-performance applications.
- Capacitive Load Drive: The amplifier maintains its performance even with substantial capacitive loads.
- No Output Phase Reversal: Unlike many older JFET amplifiers, the AD8512 does not suffer from output phase reversal when input voltages exceed the maximum common-mode voltage range.
- High Output Current and Low Distortion: High output current and low total harmonic distortion make it suitable for audio applications.
- Extended Industrial Temperature Range: Specified over the −40°C to +125°C temperature range.
Applications
- High Impedance Sensor Amplification: Ideal for amplifying signals from high impedance sensors.
- Precise Current Measurements: Suitable for precise current measurements using shunts.
- Medical Instruments: Used in medical instruments due to its high accuracy and low noise.
- Electronic Measurement and Automated Test Equipment: Excellent choice for electronic measurement and automated test equipment.
- High Performance Filters: Suitable for high-performance filters due to its stability with capacitive loads.
- Audio Applications: High output current and low distortion make it a great choice for audio applications.
Q & A
- What is the typical offset voltage of the AD8512?
The typical offset voltage of the AD8512 is 0.9 mV over the −40°C to +125°C temperature range.
- What is the input bias current of the AD8512?
The input bias current of the AD8512 is typically 75 pA over the −40°C to +125°C temperature range.
- What is the slew rate of the AD8512?
The slew rate of the AD8512 is 20 V/μs with a load resistance of 2 kΩ.
- Does the AD8512 suffer from output phase reversal?
No, the AD8512 does not suffer from output phase reversal when input voltages exceed the maximum common-mode voltage range.
- What is the gain bandwidth product of the AD8512?
The gain bandwidth product of the AD8512 is 8 MHz.
- What is the settling time of the AD8512 to 0.1% for a 0 V to 4 V step?
The settling time of the AD8512 to 0.1% for a 0 V to 4 V step is 0.4 μs.
- What is the total harmonic distortion + noise of the AD8512 at 1 kHz?
The total harmonic distortion + noise of the AD8512 at 1 kHz is 0.0005% with a gain of +1 and a load resistance of 2 kΩ.
- What is the output current capability of the AD8512?
The output current capability of the AD8512 is ±40 mA to ±54 mA.
- What is the supply current per amplifier for the AD8512?
The supply current per amplifier for the AD8512 is typically 2.3 mA with the output voltage at 0 V.
- What is the temperature range over which the AD8512 is specified?
The AD8512 is specified over the −40°C to +125°C extended industrial temperature range.
