The AD8331/AD8332/AD8334 are single-, dual-, and quad- channel ultralow noise, linear preamplifiers. They feature ultralow noise, wide gain range, low power consumption, etc.
The AD8331, AD8332, and AD8334 are single‑, dual‑, and quad‑channel ultralow‑noise, linear‑in‑dB variable‑gain amplifiers (VGAs) optimized for ultrasound systems. Each channel includes a low‑noise preamplifier (LNA), a 48 dB X‑AMP® VGA, and a selectable post‑amplifier with adjustable output clamping.
The devices operate from a single 5 V supply, support gain ranges from –4.5 dB to +43.5 dB (LO) or 7.5 dB to 55.5 dB (HI), and are rated for –40 °C to +85 °C. They are available in QSOP, TSSOP, and LFCSP packages for flexible board integration.
| Voltage noise | 0.74 nV/√Hz |
|---|---|
| Current noise | 2.5 pA/√Hz |
| 3 dB bandwidth (AD8331) | 120 MHz |
| Power consumption (AD8331) | 125 mW/channel |
| Gain range (LO) | –4.5 dB to +43.5 dB |
| Operating temperature range | –40 °C to +85 °C |
The devices operate from –40 °C to +85 °C.
A single 5 V supply is used for all three devices.
The AD8331 has an input‑referred voltage noise of 0.74 nV/√Hz.