LM1281N datasheet(3/14 Pages) NSC

3 / 14 page

AC Electrical Characteristics

See AC Test Circuit (

Figure 6), T

A = 25˚C, VCC1 = VCC2 = 12V; V4 = 0V. Manually adjust Video Output pins 18, 20, and 23 to

4V DC for the AC test unless otherwise stated (Note 15)

Symbol

Parameter

Conditions

Typical

(Note 5)

Limit

(Note 6)

Units

V max

Video Amplifier Gain

13 = 4V, VIN = 400 mVPP

10.0

7.0

V/V (min)

drive = 4V

20.0

16.9

dB (min)

∆A

V2V

Contrast Attenuation @ 2V

Ref: A

V max, V13 = 2V

−6

∆A

V 0.25V

Contrast Attenuation @ 0.25V

Ref: A

V max, V13 = 0.25V

−40

∆Drive

Drive Attenuation @ 2V

Ref: A

V max, Vdrive = 2V

−4.5

∆Drive

0.25V

Drive Attenuation @ 0.25V

Ref: A

V max, Vdrive = 0.25V

−11

V match

Absolute Gain Match @ A

V max

13 = 4V, Vdrive = 4V (Note

±0.3

V track

Gain Change between Amplifiers

13 = 4V to 2V (Notes 9, 10)

±0.2

THD

Video Amplifier Distortion

O = 1VPP,f = 10 kHz

f(−3 dB)

Video Amplifier Bandwidth (Notes

11, 12)

13 = 4V, Vdrive = 3V,

O = 4VPP

MHz

r (Video)

Video Output Rise Time (Note 11)

O = 4VPP

3.5

f (Video)

Video Output Fall Time (Note 11)

O = 4VPP

4.5

sep 10 kHz

Video Amplifier 10 kHz Isolation

13 = 4V (Note 13)

−70

sep 10 MHz

Video Amplifier 10 MHz Isolation

13 = 4V (Notes 11, 13)

−50

r (Blank)

Blank Output Rise Time (Note 11)

Blank Output = 1V

8ns

f (Blank)

Blank Output Fall Time (Note 11)

Blank Output = 1V

r-prop(Blank)

End of Blanking Propagation Delay

Blank Output = 1V

f-prop (Blank)

Start of Blanking Propagation Delay

Blank Output = 1V

pw (Clamp)

Back Porch Clamp Pulse Width

(Note 14)

200

ns (min)

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