TLC271ACPS datasheet(57/84 Pages) TI

57 / 84 page

TLC271, TLC271A, TLC271B

LinCMOS

 PROGRAMMABLE LOW-POWER

OPERATIONAL AMPLIFIERS

SLOS090D – NOVEMBER 1987 – REVISED MARCH 2001

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

APPLICATION INFORMATION

single-supply operation (continued)

Many single-supply applications require that a voltage be applied to one input to establish a reference level that

is above ground. A resistive voltage divider is usually sufficient to establish this reference level (see Figure 103).

The low input bias current consumption of the TLC271 permits the use of very large resistive values to

implement the voltage divider, thus minimizing power consumption.

The TLC271 works well in conjunction with digital logic; however, when powering both linear devices and digital

logic from the same power supply, the following precautions are recommended:

Power the linear devices from separate bypassed supply lines (see Figure 104); otherwise, the linear device

supply rails can fluctuate due to voltage drops caused by high switching currents in the digital logic.

Use proper bypass techniques to reduce the probability of noise-induced errors. Single capacitive

decoupling is often adequate; however, RC decoupling may be necessary in high-frequency applications.

(b) SEPARATE BYPASSED SUPPLY RAILS (preferred)

(a) COMMON SUPPLY RAILS

Logic

Power

Supply

Power

Logic

OUT

Figure 104. Common Versus Separate Supply Rails

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