描述 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 precision-trimmed 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 low-impedance 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. For increased performance, the 8-pin package provides 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% 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.

特性 Features

? Qualified for Automotive Applications
? 1/2 VI Virtual Ground for Analog Systems
? 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
? –102 μV Typ at IO = 0 to –10 mA
? +49 μV Typ at IO = 0 to +10 mA

? Low-Impedance Output . . . 0.0075 Typ
? Noise Reduction Pin