Overview
The AD704JN, produced by Analog Devices Inc., is a quad, low-power bipolar operational amplifier (op amp) known for its high precision and low input bias current. This device utilizes superbeta bipolar input transistors to achieve picoampere input bias current levels, similar to those of FET input amplifiers at room temperature. The AD704JN is particularly noted for its significantly lower input bias current drift over temperature compared to BiFET amplifiers, making it an excellent choice for various precision applications.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage | ±2.0 | ±15 | ±18 | V |
| Input Bias Current | 10 pA | A | ||
| Offset Voltage | 150 µV | V | ||
| Common-Mode Rejection Ratio (CMRR) | 98 | 100 | 132 | dB |
| Open-Loop Gain | 150 | 2000 | V/mV | |
| Slew Rate (Unity Gain) | 0.1 | 0.15 | V/µs | |
| Operating Temperature Range (AD704J) | 0°C | 70°C | °C | |
| Quiescent Current (per amplifier) | 1.5 | 2.4 | 2.6 | mA |
Key Features
- High dc precision with a maximum offset voltage of 150 µV and low drift over temperature (1.5 µV/°C).
- Picoampere input bias current levels, significantly lower than BiFET amplifiers, especially at high temperatures.
- Low noise characteristics, including low current noise (50 fA/√Hz at 10 Hz) and low voltage noise (17 nV/√Hz at 1 kHz).
- Internally compensated for unity gain stability.
- Low supply current (1/6 of the OP07), making it suitable for high-density circuit boards and battery-powered applications).
- No need for balancing resistors due to low input bias current).
Applications
- Industrial/process controls
- Weigh scales
- ECG/EKG instrumentation
- Low frequency active filters
- Precision instrumentation
- High quality integrators in 12- and 14-bit data acquisition systems).
Q & A
- What is the input bias current of the AD704JN?
The input bias current of the AD704JN is typically 10 pA).
- What is the maximum offset voltage of the AD704JN?
The maximum offset voltage is 150 µV).
- What are the operating temperature ranges for the AD704JN?
The AD704JN is rated over the commercial temperature range of 0°C to 70°C. Other versions (AD704A and AD704S) have different temperature ranges).
- What is the slew rate of the AD704JN at unity gain?
The slew rate at unity gain is typically 0.15 V/µs).
- Is the AD704JN internally compensated for unity gain stability?
Yes, the AD704JN is internally compensated for unity gain stability).
- What are some common applications of the AD704JN?
Common applications include industrial/process controls, weigh scales, ECG/EKG instrumentation, low frequency active filters, and precision instrumentation).
- How does the AD704JN compare to the OP07 in terms of supply current?
The AD704JN has 1/6 the supply current of the OP07 per amplifier).
- Does the AD704JN require balancing resistors?
No, the AD704JN does not require balancing resistors due to its low input bias current).
- What is the common-mode rejection ratio (CMRR) of the AD704JN?
The CMRR is typically 100 dB, with a minimum of 98 dB and a maximum of 132 dB).
- What is the maximum storage temperature range for the AD704JN?
The storage temperature range is from -65°C to +125°C).
