TI TLE2425CDR

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. A 3-terminal device, the TLE2425 precision virtual ground, eliminates all of those components.

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.

• High Output-Current Capability Sink or Source: 20 mA Typ
• Micropower Operation: 170 μA Typ
• Excellent Regulation Characteristics
  • Output Regulation: -45 μV Typ at I₀ = 0 to -10 mA; +15 μV Typ at I₀ = 0 to ±10 mA
  • Input Regulation: 1.5 μV/V Typ
• Low-Impedance Output: 0.0075 Ω Typ
• Macromodel Included