Radiation-tolerant 850-MHz fully differential amplifier

The LMH5485-SEP is a radiation tolerant, low-power, voltage-feedback, fully differential

amplifier (FDA). This part is able to achieve a high gain bandwidth product (GBWP) of

850-MHz, allowing it to maintain excellent distortion performance over a wide range of

frequencies as shown in the following figure. This wide bandwidth range is also achieved

with a relatively low power consumption of 10.1-mA and broadband voltage noise of 2.4nV/√Hz.

This combination of power consumption, bandwidth and noise allows the LMH5485-SEP to be well suited for power sensitive data acquisition systems with

frequencies >10 MHz that require both the best signal-to-noise ratio (SNR) and

spurious-free dynamic range (SFDR).

The LMH5485-SEP features the negative-rail

input required when interfacing with a DC-coupled,

ground-centered, source signal. This negative-rail input,

with a rail-to-rail output, allows for easy interface

between single-ended, ground-referenced, bipolar signal

sources and a wide variety of successive approximation

register (SAR), delta-sigma (ΔΣ), or pipeline ADCs using

only a single 2.7 V to 5.4 V

power supply. This device also features a low offset voltage

drift of ±0.5 µV/°C, allowing it to maintain excellent DC

performance over it’s wide temperature range of –55°C to

+125°C.