TLC271ACPS datasheet(58/84 Pages) TI

58 / 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

input offset voltage nulling

The TLC271 offers external input offset null control. Nulling of the input off set voltage may be achieved by

adjusting a 25-k

Ω potentiometer connected between the offset null terminals with the wiper Connected as

shown in Figure 105. The amount of nulling range varies with the bias selection. In the high-bias mode, the

nulling range allows the maximum offset voltage specified to be trimmed to zero. In low-bias and medium-bias

modes, total nulling may not be possible.

25 k

Ω

VDD

25 k

Ω

GND

(a) SINGLE SUPPLY

(b) SPLIT SUPPLY

–

OUT

IN –

IN +

IN –

IN +

Figure 105. Input Offset Voltage Null Circuit

bias selection

Bias selection is achieved by connecting the bias select pin to one of the three voltage levels (see Figure 106).

For medium-bias applications, R is recommended that the bias select pin be connected to the mid-point

between the supply rails. This is a simple procedure in split-supply applications, since this point is ground. In

single-supply applications, the medium-bias mode necessitates using a voltage divider as indicated. The use

of large-value resistors in the voltage divider reduces the current drain of the divider from the supply line.

However, large-value resistors used in conjunction with a large-value capacitor requires significant time to

charge up to the supply midpoint after the supply is switched on. A voltage other than the midpoint may be used

if it is within the voltages specified in the table of Figure 106.

0.01

µF

1 M

Ω

VDD

Low

Medium

High

1 M

Ω

To BIAS SELECT

BIAS MODE

BIAS-SELECT VOLTAGE

(single supply)

Low

Medium

High

VDD

1 V to VDD – 1 V

GND

Figure 106. Bias Selection for Single-Supply Applications

TLC271ACPS Datasheet(PDF) 58 Page - Texas Instruments

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