The ADL5240 is a high performance, digitally controlled VGA that operates from 100 MHz to 4000 MHz. It features serial and parallel interfaces, a 6-bit, 0.5 dB digital step attenuator, 31.5 dB gain control range with ±0.25 dB step accuracy.
The ADL5240 is a digitally‑controlled variable gain amplifier (VGA) designed for RF/IF applications from 100 MHz to 4 GHz. It combines a 20 dB gain amplifier with a 6‑bit, 0.5 dB step digital attenuator, providing a total gain control range of 31.5 dB with ±0.25 dB accuracy. The device can be configured with either a serial or parallel interface and supports both AMP‑DSA and DSA‑AMP loop configurations.
The VGA operates from a single 5 V supply (4.75 V‑5.25 V) and draws only 93 mA for the amplifier and 0.5 mA for the attenuator. It is packaged in a thermally efficient 5 mm × 5 mm, 32‑lead LFCSP and is specified for –40 °C to +85 °C operation. An evaluation board is provided for rapid prototyping.
| Frequency range | 100 MHz – 4000 MHz |
|---|---|
| Gain control range | 31.5 dB (±0.25 dB accuracy) |
| Digital step attenuator resolution | 6‑bit, 0.5 dB steps |
| Supply voltage | 4.75 V – 5.25 V |
| Supply current (amplifier) | 93 mA |
| Package | 5 mm × 5 mm 32‑lead LFCSP |
| Operating temperature range | ‑40 °C to +85 °C |
| Noise figure (150 MHz) | 2.8 dB |
The ADL5240 operates from 100 MHz up to 4 GHz.
It runs from a single supply of 4.75 V to 5.25 V.
The attenuator is 6‑bit, providing 0.5 dB step size.
The device draws about 93 mA for the amplifier and 0.5 mA for the attenuator.