The AD603 is a low noise, voltage-controlled amplifier for use in RF and IF AGC systems. It provides accurate, pin selectable gains of –11 dB to +31 dB with a bandwidth of 90 MHz or 9 dB to 51 dB with a bandwidth of 9 MHz. Any intermediate gain range may be arranged using one external resistor. The input referred noise spectral density is only 1.3 nV/√Hz and power con- sumption is 125 mW at the recommended ±5 V supplies. The decibel gain is “linear in dB,” accurately calibrated, and stable over temperature and supply. The gain is controlled at a high impedance (50 MΩ), low bias (200 nA) differential inp
The AD603 is a low‑noise, voltage‑controlled amplifier designed for RF and IF AGC systems. It provides pin‑selectable gain ranges of –11 dB to +31 dB with a 90 MHz bandwidth (or 9 dB to 51 dB with 9 MHz bandwidth) and features a linear‑in‑dB gain control.
Typical applications include RF/IF AGC, video gain control, A/D range extension, and signal measurement. The device is offered in 8‑lead SOIC (R) and 8‑lead ceramic DIP (Q) packages and complies with MIL‑STD‑883.
| Input Resistance (Pins 3‑4) | 97 Ω – 103 Ω |
|---|---|
| Input Noise Spectral Density | 1.3 nV/√Hz |
| Gain Range | -11 dB to +31 dB (90 MHz BW) |
| Supply Voltage Operating Range | +4.75 V to +6.3 V |
| Quiescent Current | 12.5 mA – 17 mA |
| Gain Accuracy | ±0.5 dB typical |
| Gain Scaling Factor | 40 dB/V |
The AD603 has an input noise spectral density of 1.3 nV/√Hz when the input is short‑circuited.
It offers a gain range of –11 dB to +31 dB with a 90 MHz bandwidth, or 9 dB to 51 dB with a 9 MHz bandwidth.
The device operates from +4.75 V to +6.3 V and draws 12.5 mA to 17 mA of quiescent current.
It is available in an 8‑lead SOIC (R) package and an 8‑lead ceramic DIP (Q) package.