The MAX4805/MAX4805A feature eight low-noise amplifiers (LNAs) in a noninverting configuration; the LNAs are controlled by an enable input, which simplifies device operation. These devices do not require dedicated Tx/Rx signals and include embedded LNA high-voltage protection. The protection is activated once the Tx voltage is greater than ±2.7V, thus making them transparent in any in-probe application.
While the MAX4805 and MAX4805A differ in terms of typical voltage gain (6dB and 9dB), input-current noise (2pA/rt-Hz and 1.7pA/rt-Hz), and input impedance (3.8kilohms and 9.1kilohms), both ICs operate from dual supply voltages of +2V and +5V. They are fully specified over the 0 degrees Celsius to +70 degrees Celsius commercial temperature range, and are available in a small, 5mm x 5mm, 32-pin TQFN package. Prices start at $23.54 (1000-up, FOB USA).