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Rail-to-Rail Single-Ended to Differential Amplifier Drives High Speed 16- to 18-bit SAR ADCs

MILPITAS, CA - January 25, 2010 - Linear Technology introduces the LT6350, a 33MHz, low noise, rail-to-rail input and output ADC driver that settles to 16-bits in just 350ns. It is suitable for driving the latest highest performance SAR ADCs such as the LTC2393-16. The LT6350 incorporates two op amps and matched resistors to create a differential output from a single-ended high impedance input. As a result, a differential gain of 2 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 just 8.2nV/√Hz. The LT6350 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 LT6350 can typically achieve -102/-97dBc HD2/HD3.

The LT6350 provides rail-to-rail input and output range. With a single 5V supply, the outputs can swing 0.055V to 4.945V, and by using a negative supply, the outputs can each swing from 0V to 4.945V. The LT6350 operates on 2.7V to 12V total supply. The LT6350 consumes 4.8mA supply current and has a shutdown mode that allows the system to reduce power consumption during periods of inactivity.

Fully specified commercial (0ºC to 70ºC), industrial (-40ºC to 85ºC) and extended (-40ºC to 125ºC) temperature range versions of the LT6350 are available in 8-lead MSOP and 3mm x 3mm DFN packages. Prices start at $2.59 each in quantities of 1,000 pieces. For more information, visit www.linear.com.

Summary of Features: LT6350
•  Rail-to-Rail Input & Outputs
•  Fast Settling Time: 240ns, 0.01%, 8VP-P Output Step
•  1.9nV/√Hz Input-Referred Op Amp Noise
•  High Impedance Input
•  No External Gain-Resistors Required
•  2.7V to 12V Supply Operation, 4.8mA Supply Current
•  Low Power Shutdown
•  Low Distortion (HD2/HD3):
    -102dBc/-97dBc at 100kHz, VOUTDIFF = 4VP-P
•  High DC Linearity:
    < ±1LSB, 16-Bit, 8VP-P
•  3mm × 3mm 8-Pin DFN & 8-Lead MSOP Packages

ADC Driver: Rail-to-Rail Single-Ended Input
to Rail-to-Rail Differential Output
LT6350 PR Image

Click Photo for High-Res Image