Single-Ended to Differential Amp drives 16-18 bit SAR ADCs.

Press Release Summary:

Supplied in 8-lead MSOP and 3 x 3 mm DFN packages, LT6350 is 33 MHz rail-to-rail input and output ADC driver that settles to 16 bits in 350 ns. Each of 2 internal op amps achieves 1.9 nV/√Hz input-referred noise density, resulting in 8.2 nV/√Hz total output-referred noise. Operating on 2.7-12 V supply and consuming 4.8 mA, driver enables ADCs to achieve better than 110 dB SNR over 1 MHz bandwidth. At 100 kHz, it achieves -102/-97 dBc HD2/HD3 typ.

Original Press Release:

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

MILPITAS, CA - 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

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 x 3mm 8-Pin DFN & 8-Lead MSOP Packages

About Linear Technology
Linear Technology Corporation, a manufacturer of high performance linear integrated circuits, was founded in 1981, became a public company in 1986 and joined the S&P 500 index of major public companies in 2000. Linear Technology products include high performance amplifiers, comparators, voltage references, monolithic filters, linear regulators, DC-DC converters, battery chargers, data converters, communications interface circuits, RF signal conditioning circuits, µModule® products, and many other analog functions. Applications for Linear Technology's high performance circuits include telecommunications, cellular telephones, networking products such as optical switches, notebook and desktop computers, computer peripherals, video/multimedia, industrial instrumentation, security monitoring devices, high-end consumer products such as digital cameras and MP3 players, complex medical devices, automotive electronics, factory automation, process control, and military and space systems.
LT, LTC, LTM, µModule and are registered trademarks of Linear Technology Corp. All other trademarks are the property of their respective owners.

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