1/2 VI Virtual Ground for Analog Systems

Self-Contained 3-terminal TO-226AA

Package

Micropower Operation . . . 170 μA Typ,

VI = 5 V

Wide VI Range . . . 4 V to 40 V

High Output-Current Capability

− Source . . . 20 mA Typ

− Sink . . . 20 mA Typ

Excellent Output Regulation

− −45 μV Typ at IO = 0 to −10 mA

− +15 μV Typ at IO = 0 to +10 mA

Low-Impedance Output . . . 0.0075 Ω Typ

Noise Reduction Pin (D, JG, and P

Packages Only)

description

In signal-conditioning applications utilizing a

single power source, a reference voltage equal to

one-half the supply voltage is required for

termination of all analog signal grounds. Texas

Instruments presents a precision virtual ground

whose output voltage is always equal to one-half

the input voltage, the TLE2426 “rail splitter.”

The unique combination of a high-performance,

micropower operational amplifier and a precisiontrimmed

divider on a single silicon chip results in

a precise VO/VI ratio of 0.5 while sinking and

sourcing current. The TLE2426 provides a lowimpedance

output with 20 mA of sink and source

capability while drawing less than 280 μA

of supply current over the full input range of 4 V to 40 V. A designer need not pay the price in terms of board

space for a conventional signal ground consisting of resistors, capacitors, operational amplifiers, and voltage

references. The performance and precision of the TLE2426 is available in an easy-to-use, space saving,

3-terminal LP package. For increased performance, the optional 8-pin packages provide a noise-reduction pin.

With the addition of an external capacitor (CNR), peak-to-peak noise is reduced while line ripple rejection is

improved.

Initial output tolerance for a single 5-V or 12-V system is better than 1% with 3.6% over the full 40-V input range.

Ripple rejection exceeds 12 bits of accuracy. Whether the application is for a data acquisition front end, analog

signal termination, or simply a precision voltage reference, the TLE2426 eliminates a major source of system

error.