Overview
The AD8512AR-REEL, produced by Analog Devices Inc., is a dual precision JFET operational amplifier known for its low offset voltage, low input bias current, and low noise characteristics. This amplifier is particularly suited for high impedance sensor amplification, precise current measurements using shunts, and applications requiring high accuracy and low noise. The AD8512AR-REEL maintains 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. It is available in an 8-lead narrow SOIC_N package and is specified over the extended industrial temperature range of −40°C to +125°C.
Key Specifications
| Parameter | Symbol | Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|---|
| Offset Voltage (B Grade) | VOS | −40°C < TA < +125°C | 0.08 | 0.4 | 0.8 | mV |
| Input Bias Current | IB | −40°C < TA < +125°C | 21 | 75 | 7.5 nA | pA/nA |
| Input Offset Current | IOS | −40°C < TA < +125°C | 5 | 50 | 0.5 nA | pA/nA |
| Input Capacitance (Differential) | 12.5 | pF | ||||
| Input Voltage Range | −2.0 | +2.5 | V | |||
| Output Voltage High (RL = 600 Ω) | VOH | +3.7 | +4.1 | V | ||
| Output Voltage Low (RL = 600 Ω) | VOL | −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 | 2.5 | mA | |
| Slew Rate | SR | RL = 2 kΩ | 20 | V/μs | ||
| Gain Bandwidth Product | GBP | 8 | MHz | |||
| Settling Time (0.1%, 0 V to 4 V step, G = +1) | tS | 0.4 μs | μs | |||
| Total Harmonic Distortion (THD) + Noise | THD + N | 1 kHz, G = +1, RL = 2 kΩ | 0.0005 % | % | ||
| Phase Margin | φM | 44.5 | Degrees | |||
| Voltage Noise Density (f = 1 kHz) | en | 8.0 | 10 | nV/√Hz |
Key Features
- Low Offset Voltage and Drift: The AD8512AR-REEL 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 voltage noise density ensures high accuracy and minimal distortion in various applications.
- Fast Settling Time and Slew Rate: Fast settling time and high slew rate make it ideal for applications requiring quick response times.
- High Output Current: Capable of delivering high output current, making it suitable for driving loads.
- Wide Temperature Range: Specified over the extended industrial temperature range of −40°C to +125°C.
- No Output Phase Reversal: Does not suffer from output phase reversal when input voltages exceed the maximum common-mode voltage range.
- Input Overvoltage Protection: Internal protective circuitry allows for input voltages up to 1.4 V beyond the supplies without damage.
Applications
- High Impedance Sensor Amplification: Ideal for amplifying signals from high impedance sensors due to its low input bias current and noise.
- Precise Current Measurements: Suitable for precise current measurements using shunts.
- Medical Instruments: Used in medical instruments requiring high accuracy and low noise.
- Electronic Measurement and Automated Test Equipment: Superior accuracy and fast settling time make it a good fit for these applications.
- Audio Applications: Low noise and distortion, along with high output current, make it suitable for audio circuits.
- High Performance Filters: Fast slew rate and stability with capacitive loads make it ideal for high performance filter applications.
Q & A
- What is the typical offset voltage of the AD8512AR-REEL?
The typical offset voltage of the AD8512AR-REEL is 0.4 mV for the B grade and 0.9 mV for the A grade.
- What is the input bias current of the AD8512AR-REEL?
The input bias current is typically 75 pA and can be as high as 7.5 nA over the −40°C to +125°C temperature range.
- What is the slew rate of the AD8512AR-REEL?
The slew rate is 20 V/μs.
- What is the gain bandwidth product of the AD8512AR-REEL?
The gain bandwidth product is 8 MHz.
- Does the AD8512AR-REEL suffer from output phase reversal?
No, the AD8512AR-REEL does not suffer from output phase reversal when input voltages exceed the maximum common-mode voltage range.
- What is the temperature range for the AD8512AR-REEL?
The AD8512AR-REEL is specified over the extended industrial temperature range of −40°C to +125°C.
- What are the typical output voltage high and low for the AD8512AR-REEL?
The typical output voltage high is +3.7 V to +4.1 V, and the typical output voltage low is −4.8 V to −4.2 V with a load resistance of 600 Ω.
- What is the total harmonic distortion (THD) + noise of the AD8512AR-REEL?
The THD + noise is 0.0005% at 1 kHz with a gain of +1 and a load resistance of 2 kΩ.
- What is the phase margin of the AD8512AR-REEL?
The phase margin is 44.5 degrees.
- What is the voltage noise density of the AD8512AR-REEL at 1 kHz?
The voltage noise density at 1 kHz is typically 8.0 to 10 nV/√Hz.
