TLC271 datasheet(56/84 Pages) TI

56 / 84 page

TLC271, TLC271A, TLC271B

LinCMOS

 PROGRAMMABLE LOW-POWER

OPERATIONAL AMPLIFIERS

SLOS090D – NOVEMBER 1987 – REVISED MARCH 2001

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

PARAMETER MEASUREMENT INFORMATION

full-power response

Full-power response, the frequency above which the amplifier slew rate limits the output voltage swing, is often

specified two ways: full-linear response and full-peak response. The full-linear response is generally

measuredby monitoring the distortion level of the output while increasing the frequency of a sinusoidal input

signal until the maximum frequency is found above which the output contains significant distortion. The full-peak

response is defined as the maximum output frequency, without regard to distortion, above which full

peak-to-peak output swing cannot be maintained.

Because there is no industry-wide accepted value for significant distortion, the full-peak response is specified

in this data sheet and is measured using the circuit of Figure 98. The initial setup involves the use of a sinusoidal

input to determine the maximum peak-to-peak output of the device (the amplitude of the sinusoidal wave is

increased until clipping occurs). The sinusoidal wave is then replaced with a square wave of the same

amplitude. The frequency is then increased until the maximum peak-to-peak output can no longer be maintained

(Figure 102). A square wave is used to allow a more accurate determination of the point at which the maximum

peak-to-peak output is reached.

(a) f = 100 Hz

(b) BOM > f > 100 Hz

(d) f > BOM

Figure 102. Full-Power-Response Output Signal

test time

Inadequate test time is a frequent problem, especially when testing CMOS devices in a high-volume,

short-test-time environment. Internal capacitances are inherently higher in CMOS than in bipolar and BiFET

devices, and require longer test times than their bipolar and BiFET counterparts. The problem becomes more

pronounced with reduced supply levels and lower temperatures.

APPLICATION INFORMATION

single-supply operation

While the TLC271 performs well using dual power

supplies (also called balanced or split supplies),

the

design

optimized

for

single-supply

operation. This 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.

VDD

Vref

0.01

µF

ref +

) R3

O +

ref *

) R4

) V

ref

Figure 103. Inverting Amplifier With Voltage

Reference

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