CIRCUIT DESCRIPTIOMS
3-21
Schematic Diagram AASK: OCX)30d
COAT CCLK DTAE
Figure
3. 12 Schematic diagrarrt A-ASIC D2301
Channet
Se/eetor
The channel selector selects channel A or channel B. depending on
the level of the GHANA signal
(Input13).
If CHA is "high*'
(>
3.5 V) channel
A Is
selected.
If CHA is "low"
(<
1.5 V) channel 5 is
selected.
If
a timebase speed faster
than
20
|xs is selected, both channels are displayed
In alternate mode and
CHA is a square wave signal
with a timebase-dependent frequency
(see
table
3.7). If a timebase
speed slower than
50
ps is selected, both channels are displayed In chopped
mode. The CHA signal
is a square wave signal with a trigger-dependent frequency of 500 kH2 maximum.
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