Overview
The AD8512BR-REEL7 is a dual precision, very low noise, and low input bias current JFET amplifier produced by Analog Devices Inc. This component is part of the AD8510/AD8512/AD8513 family, known for its high precision, low noise, and fast settling time. It is particularly suited for applications requiring high accuracy and stability, such as medical instruments, electronic measurement, and automated test equipment.
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 |
| Offset Voltage (A Grade) | VOS | −40°C < TA < +125°C | 0.1 | 1.0 | 1.8 | mV |
| Input Bias Current | IB | −40°C < TA < +85°C | 21 | 75 | 0.7 nA | pA |
| Input Offset Current | IOS | −40°C < TA < +85°C | 5 | 50 | 0.3 nA | pA |
| Input Capacitance (Differential) | 12.5 | pF | ||||
| Input Capacitance (Common Mode) | 11.5 | pF | ||||
| Input Voltage Range | −13.5 | +13.0 | V | |||
| Common-Mode Rejection Ratio | CMRR | VCM = −12.5 V to +12.5 V | 86 | 108 | dB | |
| Output Voltage High | VOH | RL = 600 Ω | +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 | ||
| Power Supply Rejection Ratio | PSRR | VS = ±4.5 V to ±18 V | 86 | 130 | dB | |
| Supply Current/Amplifier | ISY | VO = 0 V | 2.0 | 2.3 | mA | |
| Slew Rate | SR | RL = 2 kΩ | 20 | V/μs | ||
| Gain Bandwidth Product | GBP | 8 | MHz | |||
| Settling Time | tS | To 0.1%, 0 V to 4 V step, G = +1 | 0.4 | μs |
Key Features
- Low Offset Voltage and Input Bias Current: The AD8512BR-REEL7 features very low offset voltage and input bias current, making it ideal for high precision applications.
- Low Noise: It has a low voltage noise density, ensuring minimal noise contribution in sensitive circuits.
- Fast Settling Time: The amplifier has a fast settling time, even with substantial capacitive loads, which is crucial for applications requiring quick response times.
- High Stability with Capacitive Loads: Unlike many older JFET amplifiers, it does not suffer from output phase reversal when input voltages exceed the maximum common-mode voltage range.
- Wide Bandwidth and High Gain Bandwidth Product: With a gain bandwidth product of 8 MHz and a slew rate of 20 V/μs, it is suitable for high-frequency applications.
- High Common-Mode Rejection Ratio (CMRR): The CMRR of 86 dB to 108 dB ensures good rejection of common-mode signals.
Applications
- Medical Instruments: The high precision and low noise make it suitable for medical devices that require accurate signal processing.
- Electronic Measurement and Automated Test Equipment: Its fast settling time and stability with capacitive loads are beneficial in measurement and test equipment.
- High Impedance Sensor Amplification: It is ideal for amplifying signals from high impedance sensors due to its low input bias current and low noise.
- Precise Current Measurements: It can be used for precise current measurements using shunts due to its low input bias current and high accuracy.
- High Performance Filters: The fast slew rate and stability with capacitive loads make it a perfect fit for high performance filters.
Q & A
- What is the typical offset voltage of the AD8512BR-REEL7?
The typical offset voltage is 0.4 mV for B Grade and 1.0 mV for A Grade. - What is the input bias current of the AD8512BR-REEL7?
The input bias current is typically 75 pA, with a maximum of 0.7 nA at −40°C to +85°C. - What is the slew rate of the AD8512BR-REEL7?
The slew rate is 20 V/μs with a 2 kΩ load. - What is the gain bandwidth product of the AD8512BR-REEL7?
The gain bandwidth product is 8 MHz. - Does the AD8512BR-REEL7 suffer from output phase reversal?
No, it does not suffer from output phase reversal when input voltages exceed the maximum common-mode voltage range. - What is the common-mode rejection ratio (CMRR) of the AD8512BR-REEL7?
The CMRR is 86 dB to 108 dB. - What is the typical supply current per amplifier for the AD8512BR-REEL7?
The typical supply current per amplifier is 2.0 mA to 2.3 mA. - What are the typical output voltage ranges for the AD8512BR-REEL7?
The output voltage high is typically +3.7 V to +4.1 V, and the output voltage low is typically −4.8 V to −4.2 V with a 600 Ω load. - What are some common applications of the AD8512BR-REEL7?
Common applications include medical instruments, electronic measurement, automated test equipment, high impedance sensor amplification, and precise current measurements. - What is the operating temperature range of the AD8512BR-REEL7?
The operating temperature range is −40°C to +125°C.
