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 1.3 nV/√Hz, and gain accuracy is ±0.5 dB.
The AD603 is a low‑noise, voltage‑controlled variable gain amplifier designed for RF/IF AGC applications. This handbook details its functional block diagram, pin configuration, and typical performance characteristics.
Key sections include specifications (input resistance, noise density, bandwidth, gain accuracy), absolute maximum ratings, ESD precautions, test circuits, and an ordering guide for the various package options.
| Input Resistance | 100 Ω |
|---|---|
| Input Capacitance | 2 pF |
| Input Noise Spectral Density | 13 nV/√Hz |
| 3‑dB Bandwidth (gain = –3 dB) | 90 MHz |
| Gain Accuracy (100 kHz) | ±0.5 dB |
| Supply Voltage Range | +4.75 V to +6.3 V |
| Quiescent Current | 12.5 mA (typical) |
The AD603 has an input resistance of approximately 100 Ω.
The device operates from about +4.75 V to +6.3 V.
Typical quiescent current is 12.5 mA.
The 3‑dB bandwidth is 90 MHz.