Overview
The AD743JRZ-16, produced by Analog Devices Inc., is an ultralow noise, precision, FET input, monolithic operational amplifier. This device combines the ultralow voltage noise typically associated with bipolar input op-amps and the very low input current of a FET input device. It is particularly notable for its absence of output phase reversal when the negative common-mode voltage limit is exceeded. The AD743 is designed for applications requiring high precision and low noise, such as preamplifiers in capacitive sensors, sonar preamplifiers, and high dynamic range filters.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Input Voltage Noise | 2.9 nV/√Hz at 10 kHz, 0.38 µV p-p (0.1 Hz to 10 Hz) | nV/√Hz, µV p-p |
| Input Current Noise | 6.9 fA/√Hz at 1 kHz | fA/√Hz |
| Input Bias Current | 250 pA | pA |
| Input Offset Voltage | 1 mV | mV |
| Open-Loop Gain | 1000 V/mV | V/mV |
| Slew Rate | 2.8 V/µs | V/µs |
| Unity-Gain Bandwidth | 4.5 MHz | MHz |
| Supply Voltage Range | ±4.8 V to ±18 V | V |
| Operating Temperature Range | 0°C to 70°C | °C |
| Package Type | 16-lead SOIC | |
| Common Mode Rejection Ratio | 95 dB | dB |
| Output Current per Channel | 40 mA | mA |
Key Features
- Ultralow Noise Performance: The AD743 offers an input voltage noise of 2.9 nV/√Hz at 10 kHz and 0.38 µV p-p from 0.1 Hz to 10 Hz, making it ideal for high-sensitivity applications.
- Low Input Current: With a maximum input bias current of 250 pA, it is suitable for applications requiring minimal input current.
- Excellent DC Performance: The device features a maximum initial offset voltage of 1 mV and low input offset voltage drift, ensuring stable DC operation.
- No Output Phase Reversal: The AD743 does not exhibit output phase reversal when the negative common-mode voltage limit is exceeded, enhancing reliability in critical applications.
- High Gain Bandwidth Product: A unity-gain bandwidth of 4.5 MHz and a slew rate of 2.8 V/µs make it suitable for high-frequency applications.
Applications
- Capacitive Sensors: The AD743 is specifically designed for use as a preamp in capacitive sensors, such as ceramic hydrophones.
- Sonar Preamplifiers: Its low noise and high gain make it ideal for sonar preamplifiers.
- High Dynamic Range Filters: Suitable for filters requiring high dynamic range, such as those with >140 dB dynamic range.
- Photodiode and IR Detector Amplifiers: The low noise and high sensitivity of the AD743 make it suitable for amplifying signals from photodiodes and IR detectors.
- Accelerometers: It can be used in accelerometer applications due to its low noise and high precision.
Q & A
- What is the input voltage noise of the AD743 at 10 kHz?
The input voltage noise of the AD743 at 10 kHz is 2.9 nV/√Hz.
- What is the maximum input bias current of the AD743?
The maximum input bias current of the AD743 is 250 pA.
- Does the AD743 exhibit output phase reversal when the negative common-mode voltage limit is exceeded?
No, the AD743 does not exhibit output phase reversal when the negative common-mode voltage limit is exceeded.
- What is the unity-gain bandwidth of the AD743?
The unity-gain bandwidth of the AD743 is 4.5 MHz.
- What is the slew rate of the AD743?
The slew rate of the AD743 is 2.8 V/µs.
- What is the operating temperature range of the AD743?
The operating temperature range of the AD743 is from 0°C to 70°C.
- What type of package is the AD743 available in?
The AD743 is available in a 16-lead SOIC package.
- What is the common mode rejection ratio (CMRR) of the AD743?
The CMRR of the AD743 is 95 dB.
- What are some typical applications of the AD743?
Typical applications include capacitive sensors, sonar preamplifiers, high dynamic range filters, photodiode and IR detector amplifiers, and accelerometers.
- What is the maximum output current per channel of the AD743?
The maximum output current per channel of the AD743 is 40 mA.
