The AD8331/AD8332/AD8334 is an ultralow noise VGA with preamp and programmable RIN.
The AD8332 is an ultralow‑noise, linear‑in‑dB variable gain amplifier (VGA) optimized for ultrasound and high‑speed ADC applications. It integrates a low‑noise preamplifier (LNA), a programmable VGA with 48 dB gain range, and a selectable post‑amplifier with output clamping.
The handbook provides a complete description of the device, including functional block diagrams, pin assignments, electrical specifications, typical performance curves, test circuits, and guidance on layout, grounding, and evaluation board usage. It also lists ordering information and mechanical dimensions.
| Voltage noise | 0.74 nV/VHz |
|---|---|
| Gain range (LO mode) | -4.5 dB to +43.5 dB |
| Gain range (HI mode) | +7.5 dB to +55.5 dB |
| 3 dB bandwidth | 100 MHz |
| Power consumption per channel | 145 mW |
| Operating temperature range | -40 °C to +85 °C |
| Output short‑circuit current | 45 mA |
| Supply voltage | 5 V (single supply) |
The AD8332 has a voltage noise of 0.74 nV/VHz.
In LO gain mode the gain ranges from –4.5 dB to +43.5 dB, and in HI gain mode from +7.5 dB to +55.5 dB.
The device operates from a single 5 V supply.
It is rated for –40 °C to +85 °C.