LM1203 Datasheet, PDF(3/16 Page) National Semiconductor (TI)

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LM1203 Datasheet, PDF (3/16 Pages) National Semiconductor (TI) – RGB Video Amplifier System

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AC Dynamic Tests S17 21 26 Closed V14 e 0V V15 e 4V unless otherwise stated (Continued)

Symbol

Parameter

Conditions

Typ

Tested

Design

Units

Limit (Note 2) Limit (Note 3)

Vsep

Video Amplifier 10 kHz Isolation V12 e 12V (Note 7)

b65

10 kHz

Vsep

Video Amplifier 10 MHz Isolation V12 e 12V (Notes 4 7)

10 MHz

b46

Note 1 VCC supply pins 1 13 23 28 must be externally wired together to prevent internal damage during VCC power on off cycles

Note 2 These parameters are guaranteed and 100% production tested

Note 3 Design limits are guaranteed (but not 100% production tested) These limits are not used to calculate outgoing quality levels

Note 4 When measuring video amplifier bandwidth or pulse rise and fall times a double sided full ground plane printed circuit board without socket is recommend-

ed Video Amplifier 10 MHz isolation test also requires this printed circuit board

Note 5 Measure gain difference between any two amplifiers VIN e 1 Vp-p

Note 6 Adjust input frequency from 10 kHz (Avmax ref level) to the b3 dB corner frequency (f b3 dB)

Note 7 Measure output levels of the other two undriven amplifiers relative to driven amplifier to determine channel separation Terminate the undriven amplifier

inputs to simulate generator loading Repeat test at fIN e 10 MHz for Vsep e 10 MHz

Note 8 DAv track is a measure of the ability of any two amplifiers to track each other and quantifies the matching of the three attenuators It is the difference in

gain change between any two amplifiers with the Contrast Voltage V12 at either 5V or 2V measured relative to an Av max condition V12 e 12V For example at

Av max the three amplifiers gains might be 17 4 dB 16 9 dB and 16 4 dB and change to 7 3 dB 6 9 dB and 6 5 dB respectively for V12 e 5V This yields the

measured typical g0 1 dB channel tracking

Note 9 Operating Ratings indicate conditions for which the device is functional See Electrical Specifications for guaranteed performance limits

Peaking capacitors See Frequency Response

using various peaking cups graph on next page

FIGURE 2 LM1203 Test Circuit

TL H 9178 â 2

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