The AD743 is Analog Devices' ultralow noise, precision, FET input, bipolar operational amplifier.
The AD743 is an ultralow‑noise, precision, FET‑input monolithic operational amplifier. It combines the very low voltage‑noise performance of bipolar op‑amps (2.9 nV/√Hz at 10 kHz) with the low input‑bias current of a JFET device (250 pA max). The device offers a 0.5 mV maximum offset voltage, 4.5 MHz unity‑gain bandwidth, 2.8 V/µs slew rate, and operates from ±15 V supplies with a quiescent current of about 8‑10 mA.
Typical applications include high‑dynamic‑range preamplifiers for capacitive sensors such as hydrophones and accelerometers, charge‑sensitive amplifiers, and low‑noise filter stages. The AD743 is offered in 8‑lead PDIP and 16‑lead SOIC packages and is rated for operation from –65 °C to +125 °C (storage) and 0 °C to 70 °C (junction).
| Input Offset Voltage (max) | 0.5 mV |
|---|---|
| Input Bias Current (typ) | 250 pA |
| Input Voltage Noise (typ, 10 kHz) | 2.9 nV/√Hz |
| Maximum Input Voltage Noise (10 kHz) | 4.0 nV/√Hz |
| Unity‑Gain Bandwidth | 4.5 MHz |
| Power Supply Range | ±15 V |
| Quiescent Current | 8.1–10.0 mA |
The AD743’s maximum input voltage noise is 4.0 nV/√Hz at 10 kHz.
No, the AD743 does not exhibit an output phase reversal under those conditions.
The AD743 is available in an 8‑lead PDIP and a 16‑lead SOIC package.
Typical input bias current is 250 pA.