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TIDA-00294-August 2014 High Performance Single Ended to Differential Active Interface for High Speed ADCs
1
Copyright © 2014, Texas Instruments Incorporated
Ken Chan, Michael Steffes
TI High Speed Designs: Verified Design
High Performance Single Ended to Differential Active
Interface for High Speed ADCs
TI High Speed Designs Circuit Description
TI High Speed Designs are analog solutions created
by TI’s analog experts. Verified Designs offer the
theory, component selection, simulation, complete
PCB schematic & layout, bill of materials, and
measured performance of useful circuits. Circuit
modifications that help to meet alternate design goals
are also discussed.
The quad channel DEV-ADC34J22 board from Dallas
Logic offers an example of a DC coupled single to
differential channel using the THS4541 wideband
Fully Differential Amplifier driving an ADC34J22. This
type of circuit may be used in sensor front end, motor
control, and test equipment applications. The
amplifier circuit implemented on this EVM has a
voltage gain of 2x. Applying a maximum 1Vpp ground
centered input to one of the inputs, will result in a
2Vpp differential signal centered at 0.95V common
mode at the ADC input pins. Included in this path is a
low insertion loss 20MHz Bessel filter to limit the SNR
degradation.
Design Resources
ADC34J22EVM Product Folder
DEV-ADC34J22 EVM Product Folder
ADC3XJXX Design EVM Design Package
Ask The Analog Experts
WEBENCH® Design Center
TI Precision Designs Library
Vocm
R
F
R
F
R
G
R
EQ
= R
G
+ R
T
|| R
S
R
T
FDA
R
S
V
S
+
V
S-
V
SIG
V
OUT+
V
OUT
-
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