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CV-A50 / CV-A60
5.3. Input and Output Circuits
In the following schematic diagrams the input and output circuits for video and timing signals
are shown. Jumper settings are shown as for factory default. For alternative connections refer
to “10.1. CV-A50/60 emulating CV-M50 interfacing.”
5.3.1. Video output
GND
#4/12
75
Video
Output
NC
82p
2µ7
CXA1310
32
300 mV
420 mV
L
BNC
GND
#4/12
75
Video
Output
NC
82p
2µ7
CXA1310
32
300 mV
420 mV
L
BNC
The video output is a 75 Ω DC coupled
circuit. The BNC connector and pin #4 on
the 12-pin connector is in parallel. Avoid
double termination. The video DC level is
shown with 75 Ω termination.
Fig. 4. Video output.
5.3.2. Trigger input
The trigger input is AC coupled. To allow a
long pulse width, the input circuit is a flip
flop, which is toggled by the negative or
positive differentiated spikes caused by
the falling or rising trigger edges.
GND
+5V
33k
TTL
1k
GND
100n
1k
Trigger
input
33k
100k
1n
NCNC
#5/6
JP4#11/12
100
100n
+12v
JP1
GND
+5V
33k
TTL
1k
GND
100n
1k
Trigger
input
33k
100k
1n
NCNC
#5/6
JP4#11/12
100
100n
+12v
JP1
The trigger polarity can be changed.
Trigger input level 4 V ±2 V.
The trigger-input impedance is 1 kΩ.
JP1 and JP4 are for alternative
configuration for pin #10.
Fig. 5. Trigger input.
5.3.3. HD and VD input
+5V
47p
33k
TTL
1k2
GND
10µ
4k7
VD HD
Input/output
+
75
SW2
1k
1n
NC
From VD HD
output
SW1
+5V
47p
33k
TTL
1k2
GND
10µ
4k7
VD HD
Input/output
+
75
SW2
1k
1n
NC
From VD HD
output
SW1
The input circuit for external HD and VD
signals are shown. It can be 75 Ω terminated
by closing SW2. SW1 will switch to output the
internal HD and VD signal.
HD and VD input level is 4 V ±2 V.
Fig. 6. HD and VD input.
5.3.4. HD, VD, PCLK, WEN and EEN output
Output circuit for these signals are 75 Ω
complementary emitter followers. It will
deliver a full TTL signal. JP5 and JP3 are for
alternative configuration for pin #10.
GND
+5V
10
10
10k
10k
67
TTL
220
VD, HD
WEN/ EEN
PCLK
WEN
#10/12
#6/6
#9/12
SW1
JP3
JP2
JP5
GND
+5V
10
10
10k
10k
67
TTL
220
VD, HD
WEN/ EEN
PCLK
WEN
#10/12
#6/6
#9/12
SW1
JP3
JP2
JP5
Output level ≥4 V from 75Ω. (No
termination).
The WEN polarity can be changed.
Fig. 7. HD, VD, PCLK, WEN and EEN output.
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