1 Features

? Radiation tolerant

– TID assured for every wafer lot up to 30 krad

(Si)

– Single event latch-up (SEL) immune to

LET = 43 MeV-cm2 /mg

– Qualified over the military temperature range:..

–55°C to 125°C

? Gain bandwidth product (GBWP): 850 MHz

? Slew rate: 1300 V/μs

? HD2, HD3: –118 dBc, –147 dBc (100 kHz, 2 VPP)

? Input voltage noise: 2.4 nV/√Hz

? Low offset drift: ±0.5 μV/°C (typical)

? Negative rail input (NRI), rail-to-rail output (RRO)

? Power supply:

– Supply voltage range: 2.7 V to 5.4 V

– Quiescent current: 10.1 mA

– Power-down capability: 2 μA (typical)

2 Applications

? Low-power, high-performance ADC driver:

– SAR, ΔΣ, and pipeline

? Differential DAC output driver

? Command and data handling

? Launch vehicle systems

? Space imaging systems:

– Optical imaging payload

– Radar imaging payload

– Thermal imaging cameras

3 Description

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, groundcentered,

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.