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Rail-to-rail input and output ADC driver

Linear Technology has introduced the LT6350, a 33MHz, low noise, rail-to-rail input and output ADC driver that settles to 16-bits in 350ns. It is suitable for driving new high performance SAR ADCs such as the LTC2393-16. The device incorporates two op amps and matched resistors to create a differential output from a single-ended high impedance input. A differential gain of two is achieved with no external feedback resistors, and higher gain can be obtained by using feedback resistors. Each of the two internal op amps achieve a low 1.9nV/√Hz input-referred noise density, resulting in a total output-referred noise of 8.2nV/√Hz. The device enables high performance ADCs to achieve better than 110dB SNR over a 1MHz bandwidth. The input op amp is trimmed for constant low differential input-referred voltage offset over the input range to prevent VOS steps from degrading distortion. At 100kHz, the device can typically achieve -102/-97dBc HD2/HD3. The device provides rail-to-rail input and output range. With a single 5V supply, the outputs can swing 0.055 to 4.945V, and by using a negative supply, the outputs can each swing from 0 to 4.945V. The device operates on 2.7 to 12V total supply.