TLE2662 datasheet(27/40 Pages) TI

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TLE2662

DUAL

µPOWER JFET-INPUT OPERATIONAL AMPLIFIER

WITH SWITCHED-CAPACITOR VOLTAGE CONVERTER

SLOS118B – DECEMBER 1992 – REVISED AUGUST 1994

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

APPLICATION INFORMATION

typical application (continued)

Figure 51

30405060

RIPPLE AND SWITCHING NOISE ON

AMPLIFIER OUTPUT

TIME

100

VCC+ = 5 V

RL = 600 Ω

CIN = 100

µF

t – Time –

µs

VOL+80

VOL+60

VOL+40

VOL+20

VOL

VOL–20

VOL–40

VOL–60

VOL–80

COUT = 10

µF

VID = –100 mV

Figure 52

30405060

7080

100

t – Time –

µs

RIPPLE AND SWITCHING NOISE ON

AMPLIFIER OUTPUT

TIME

VOL+20

VOL+15

VOL+10

VOL+5

VOL

VOL–5

VOL–10

VOL–15

VOL–20

VCC+ = 5 V

RL = 600 Ω

CIN = 100

µF

COUT = 100

µF

VID = –100 mV

Additional filtering can be added between SCOUT and VCC– to further reduce ripple and noise. For example,

adding the simple low-pass LC filter shown in Figure 53, implemented using a 50-

µH inductor and 220-µF

capacitor (available in surface mount), results in the reduced levels of ripple and switching noise at the

amplifier’s outputs (see Figures 54 and 55). Larger values of L or C can be used for even better attenuation.

1 µF

COUT

VCC

SCOUT

Filter

fr =

π LC

Figure 53. LC Filter Used to Reduce Ripple and Switching Noise, fr = 1/2π√LC, A = –40 dB Per Decade

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