TLC2652 datasheet(21/31 Pages) TI

21 / 31 page

TLC2652, TLC2652A, TLC2652Y

Advanced LinCMOS

™ PRECISION CHOPPER-STABILIZED

OPERATIONAL AMPLIFIERS

SLOS019C – SEPTEMBER 1988 – REVISED FEBRUARY 1999

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

TYPICAL CHARACTERISTICS†

Figure 31

–50

– 25

TA – Free-Air Temperature – °C

–75

PHASE MARGIN

FREE-AIR TEMPERATURE

100

125

VDD

± = ±5 V

RL = 10 kΩ

CL = 100 pF

Figure 32

200

400

600

PHASE MARGIN

LOAD CAPACITANCE

800

1000

VDD

± = ±5 V

RL = 10 kΩ

TA = 25°C

CL – Load Capacitance – pF

† Data at high and low temperatures are applicable only within the rated operating free-air temperature ranges of the various devices.

APPLICATION INFORMATION

capacitor selection and placement

The two important factors to consider when selecting external capacitors CXA and CXB are leakage and

dielectric absorption. Both factors can cause system degradation, negating the performance advantages

realized by using the TLC2652.

Degradation from capacitor leakage becomes more apparent with the increasing temperatures. Low-leakage

capacitors and standoffs are recommended for operation at TA = 125°C. In addition, guard bands are

recommended around the capacitor connections on both sides of the printed circuit board to alleviate problems

caused by surface leakage on circuit boards.

Capacitors with high dielectric absorption tend to take several seconds to settle upon application of power, which

directly affects input offset voltage. In applications where fast settling of input offset voltage is needed, it is

recommended that high-quality film capacitors, such as mylar, polystyrene, or polypropylene, be used. In other

applications, however, a ceramic or other low-grade capacitor can suffice.

Unlike many choppers available today, the TLC2652 is designed to function with values of CXA and CXB in the

range of 0.1

µF to 1 µF without degradation to input offset voltage or input noise voltage. These capacitors

should be located as close as possible to the CXA and CXB pins and returned to either VDD– or C RETURN. On

many choppers, connecting these capacitors to VDD– causes degradation in noise performance. This problem

is eliminated on the TLC2652.

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