AD8331/AD8332 are single- and dual-channel ultralow noise, linear-in-dB, variable gain amplifiers. Although optimized for ultrasound systems, they are usable as low noise variable gain amplifiers. They provide up to 43.5 dB of linear variable gain with low output-referred noise and high input impedance matching.
The AD8331/AD8332 are linear-in-dB, variable gain amplifiers optimized for ultrasound systems but usable up to 120 MHz. Each channel includes an ultralow noise preamplifier (LNA), a VGA with a 48 dB gain range, and a selectable postamplifier with adjustable output limiting.
These devices feature active input impedance matching suitable for high-speed differential ADCs. They operate on a single 5 V supply with a quiescent power consumption of 125 mW per channel and are available in various packages including QSOP, TSSOP, and LFCSP.
| Voltage noise (LNA) | 0.74 nV/VHz |
|---|---|
| Current noise | 2.5 pA/VHz |
| 3 dB bandwidth (LNA) | 130 MHz |
| Gain range (LO) | -4.5 dB to +43.5 dB |
| Supply voltage | 4.5 V to 5.5 V |
| Operating temperature | -40°C to +85°C |
The quiescent power consumption is 125 mW per channel.
The AD8331 is available in a 20-lead QSOP package, and the AD8332 in 28-lead TSSOP and 32-lead LFCSP packages.
Yes, they are optimized for 10-/12-bit ADCs.