TLC272CPWR datasheet(29/53 Pages) TI1

29 / 53 page

TLC272, TLC272A, TLC272B, TLC272Y, TLC277

LinCMOS

 PRECISION DUAL OPERATIONAL AMPLIFIERS

SLOS091E – OCTOBER 1987 – REVISED FEBRUARY 2002

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

APPLICATION INFORMATION

single-supply operation

While the TLC272 and TLC277 perform well using dual power supplies (also called balanced or split supplies),

the design is optimized for single-supply operation. This design includes an input common-mode voltage range

that encompasses ground as well as an output voltage range that pulls down to ground. The supply voltage

range extends down to 3 V (C-suffix types), thus allowing operation with supply levels commonly available for

TTL and HCMOS; however, for maximum dynamic range, 16-V single-supply operation is recommended.

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 38).

The low input bias current of the TLC272 and TLC277 permits the use of very large resistive values to implement

the voltage divider, thus minimizing power consumption.

The TLC272 and TLC277 work 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 39); 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, high-frequency applications may require RC decoupling.

0.01

µF

VREF

VDD

REF +

) R3

O +

REF *

) R4

) V

REF

Figure 38. Inverting Amplifier With Voltage Reference

(b) SEPARATE BYPASSED SUPPLY RAILS (preferred)

(a) COMMON SUPPLY RAILS

Logic

Power

Supply

Power

Logic

OUT

Figure 39. Common vs Separate Supply Rails

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