AC Dynamic Tests
S17
Symbol
Vsep
10 kHz
Vsep
10 MHz
Parameter
21 26 Closed V14
e
0V V15
e
4V unless otherwise stated (Continued)
Conditions
V12
e
12V (Note 7)
V12
e
12V (Notes 4 7)
Typ
b
65
b
46
Tested
Limit (Note 2)
Design
Limit (Note 3)
Units
dB
dB
Video Amplifier 10 kHz Isolation
Video Amplifier 10 MHz Isolation
Note 1
V
CC
supply pins 1 13 23 28 must be externally wired together to prevent internal damage during V
CC
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 V
IN
e
1 Vp-p
Note 6
Adjust input frequency from 10 kHz (Av
max
ref level) to the
b
3 dB corner frequency (f
b
3 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 f
IN
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
g
0 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
TL H 9178 – 2
FIGURE 2 LM1203 Test Circuit
3
http
www national com
NSC [ NATIONAL SEMICONDUCTOR ]
