2.5-V Virtual Ground for 5-V/GND Analog
Systems
High Output-Current Capability
Sink or Source . . . 20 mA Typ
Micropower Operation . . . 170 μA Typ
Excellent Regulation Characteristics
− Output Regulation
−45 μV Typ at IO = 0 to −10 mA
+15 μV Typ at IO = 0 to +10 mA
− Input Regulation = 1.5 μV/V Typ
Low-Impedance Output . . . 0.0075 Ω Typ
Macromodel Included

description
In signal-conditioning applications using a single
power source, a reference voltage is required for
termination of all signal grounds. To accomplish
this, engineers have typically used solutions
consisting of resistors, capacitors, operational
amplifiers, and voltage references. Texas Instruments
has eliminated all of those components
with one easy-to-use 3-terminal device. That
device is the TLE2425 precision virtual ground.
Use of the TLE2425 over other typical circuit
solutions gives the designer increased dynamic
signal range, improved signal-to-noise ratio,
lower distortion, improved signal accuracy, and
easier interfacing to ADCs and DACs. These
benefits are the result of combining a precision
micropower voltage reference and a high-performance
precision operational amplifier in a single
silicon chip. It is the precision and performance of
these two circuit functions together that yield such
dramatic system-level performance.
The TLE2425 improves input regulation as well as output regulation and, in addition, reduces output impedance
and power dissipation in a majority of virtual-ground-generation circuits. Both input regulation and load
regulation exceed 12 bits of accuracy on a single 5-V system. Signal-conditioning front ends of data acquisition
systems that push 12 bits and beyond can use the TLE2425 to eliminate a major source of system error.