10
FN4153.7
September 26, 2008
AC Test Circuits
FIGURE 6. -3dB BANDWIDTH (NOTES 8 thru 11) FIGURE 7. ALL HOSTILE OFF-ISOLATION (NOTES 11 thru 13)
FIGURE 8. SINGLE CHANNEL CROSSTALK (NOTES 11, 14
thru 17)
FIGURE 9. ALL HOSTILE CROSSTALK (NOTES 11, 16, 18
thru 20)
NOTES:
8. Program the desired input to output combination (e.g., IN7 to OUT1).
9. Enable the selected output(s).
10. Drive the selected input with V
IN
, and measure the -3dB frequency at the selected output (V
OUT
).
11. Load all outputs with the desired R
L
.
12. Disable all outputs.
13. Drive all inputs with V
IN
and measure V
OUT
at any output; isolation (in dB) = -20log
10
(V
OUT
/V
IN
).
14. Drive V
IN
on one input which connects to one output (e.g., IN7 to OUT7).
15. Terminate all other inputs to GND.
16. Enable all outputs.
17. Measure V
OUT
at any undriven output; crosstalk (in dB) = 20log
10
(V
OUT
/V
IN
).
18. Terminate one input to GND, and connect that input to a single output (e.g., IN0 to OUT0).
19. Drive the other seven inputs with V
IN
, and connect these active inputs to the remaining seven outputs.
20. Measure V
OUT
at the quiescent output; crosstalk (in dB) = 20log
10
(V
OUT
/V
IN
).
IN0
IN1
IN2
IN3
IN4
IN5
IN6
IN7
OUT0
OUT3
OUT4
OUT5
OUT6
OUT7
OUT1
OUT2
V
OUT
V
IN
= 1V
P-P
, SWEEP FREQUENCY
IN0
IN1
IN2
IN3
IN4
IN5
IN6
IN7
OUT0
OUT3
OUT4
OUT5
OUT6
OUT7
OUT1
OUT2
V
IN
= 1V
P-P
, AT 10MHz
V
OUT
V
OUT
V
OUT
V
OUT
V
OUT
V
OUT
V
OUT
V
OUT
IN0
IN1
IN2
IN3
IN4
IN5
IN6
IN7
OUT0
OUT3
OUT4
OUT5
OUT6
OUT7
OUT1
OUT2
V
IN
= 1V
P-P
, AT 10MHz
V
OUT
V
OUT
V
OUT
V
OUT
V
OUT
V
OUT
V
OUT
7 X 75Ω
IN0
IN1
IN2
IN3
IN4
IN5
IN6
IN7
OUT0
OUT3
OUT4
OUT5
OUT6
OUT7
OUT1
OUT2
V
IN
= 1V
P-P
, AT 10MHz
V
OUT
75Ω
HA456
