OPA688M datasheet(11/24 Pages) TI2

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OPA688M

UNITY GAINSTABLE WIDEBAND

VOLTAGE LIMITING AMPLIFIER

SGLS144B − APRIL 2003 − DECEMBER 2006

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

TYPICAL CHARACTERISTICS

Figure 24

−3

−6

−9

−12

−15

−18

FREQUENCY RESPONSE

Frequency (Hz)

10M

100M

V O = 0.2Vp−p

G = +1, R

C =

∞ , R

F = 25

Ω

G = +1, R

C = 175

Ω , R

F = 25

Ω

G = +2, R

C =

∞

G = +5, R

C =

∞

150

Ω

R C

Figure 25

−3

−6

−9

−12

−15

−18

−21

−24

FREQUENCY RESPONSE

Frequency (Hz)

10M

100M

V O = 0.2Vp−p

G =

− 5

G =

− 2

G =

− 1

Figure 26

LARGE−SIGNAL FREQUENCY RESPONSE

Frequency (Hz)

10M

100M

2.0Vp−p

≤ 0.2Vp−p

G = +2

−3

−6

−9

−12

−15

−18

Figure 27

V H AN D V L− L IM IT ED PU LS E R ESP O N S E

5. 0

4. 5

4. 0

3. 5

3. 0

2. 5

2. 0

1. 5

1. 0

0. 5

T i m e ( 20n s / di v )

V H =V CM +1 .2 V

V L =V CM −1 .2 V

V O

V IN

CM =2 . 5 V

Figure 28

−40

−45

−50

−55

−60

−65

−70

−75

−80

−85

−90

HARMONIC DISTORTION vs FREQUENCY

Frequency (Hz)

10M

20M

V O = 2 Vp-p

R L = 500 Ω

HD2

HD3

Figure 29

HARMONIC DISTORTION NEAR LIMIT VOLTAGES

| Limit Voltages − 2.5V

DC |

0.9

1.0

1.1

1.2

1.3

1.4

1.5

1.6

1.7

1.8

V O = 2.5V ± 1Vp

f 1 = 5 MHz

R L = 500 Ω

HD2

HD3

−40

−45

−50

−55

−60

−65

−70

−75

−80

−85

−90

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