The AD8370 is a low-cost, digitally controlled, variable gain amplifier (VGA) that provides precision gain control, high IP3, and low noise figure. The AD8370 features excellent distortion performance, with typical distortion of -60 dBc at frequencies above 300 MHz. The AD8370's low cost and high performance make it suitable for automotive, industrial, consumer, and communications applications.
The AD8370 VGA offers programmable gain from –11 dB to +17 dB (low range) and 6 dB to 34 dB (high range) with 2 dB resolution. It features differential inputs and outputs, a wide input dynamic range, and a power‑down mode that reduces consumption to under 4 mA. The device operates from a 3 V to 5 V supply and is supplied in a 16‑lead TSSOP package.
The datasheet provides detailed specifications, absolute maximum ratings, pin descriptions, typical performance graphs, and application notes for differential ADC drivers, IF sampling receivers, RF/IF gain stages, and cable/video interfaces. It also includes layout guidelines, power‑up/down behavior, and test setup diagrams.
| -3 dB Bandwidth | 750 MHz |
|---|---|
| Gain Range (Low) | −11 dB to +17 dB |
| Gain Range (High) | 6 dB to 34 dB |
| Supply Voltage | 3.0 V to 5.5 V |
| Quiescent Current (typical) | 78 mA |
| Power‑down Current | 3.7 mA |
| Input Differential Resistance | 200 Ω |
| Output Differential Resistance | 95 Ω |
The AD8370 operates from a supply voltage of 3.0 V to 5.5 V.
The device provides a –3 dB bandwidth of 750 MHz.
In power‑down mode the AD8370 draws about 3.7 mA.
The differential input resistance is 200 Ω.