This document describes the features and characteristics of the AD8330 variable gain amplifier. It has a fully differential signal path, which can also be used with single-sided signals. The input range is from 0.3mV to 1V rms, and the output is in rail-to-rail mode. It also has automatic offset compensation, linear-in-dB and linear-in-magnitude gain modes. The gain range is from 0dB to 50dB, with an inverted gain range of 50dB to 0dB. The nominal gain range is from 0.03 to 10, with a magnitude range of 15mV to 5V. It has a constant bandwidth of 150MHz, low noise, low distortion, and low power consumption. It is suitable for applications such as pre-ADC signal conditioning and driving adjustable AGC amplifiers.
The AD8330 variable gain amplifier provides a fully differential signal path with gain from 0 dB to 50 dB, selectable by a voltage on the VDBS pin (30 mV/dB). It operates from a 5 V supply, draws about 20 mA, and maintains a constant 150 MHz bandwidth across the entire gain range. The device is offered in 16‑lead LFCSP and QSOP packages and is rated for –40 °C to +85 °C.
Key features include rail‑to‑rail output swing, low input‑referred noise (5 nV/√Hz typical), and programmable offset control. The datasheet contains pin configurations, typical performance graphs, and an ordering guide for the various package options.
| Input Capacitance | 4 pF |
|---|---|
| Gain Range | 0 dB to 50 dB |
| Gain Scaling Slope | 30 mV/dB |
| Operating Temperature Range | –40 °C to +85 °C |
The gain is controlled by a voltage on the VDBS pin from 0 V to 1.5 V, giving 0 dB to 50 dB gain (30 mV/dB).
The AD8330 maintains a constant 150 MHz bandwidth across the entire gain range.
The device is offered in 16‑lead LFCSP and 16‑lead QSOP packages.