5.3. Input and Output Circuits
In the following schematic diagrams the input and output circuits for video and timing signals
are shown. For alternative connections refer to "10.1. CV-A11 emulating CV-M10 interfacing."
Jumper settings are shown as for factory default.
5.3.1. Video output
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.
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.
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.
5.3.3. HD and VD input
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.
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.
Output level ≥4 V from 75Ω. (No
termination).
The WEN polarity can be changed.
Signal on pin #6/6 can be changed.
CV-A11
Fig. 4. Video output.
Trigger
Trigger
input
input
Fig. 5. Trigger input.
Fig. 6. HD and VD input.
TTL
TTL
Fig. 7. HD, VD, PCLK, WEN and EEN output.
- 5 -
CXA1310
CXA1310
L
L
2µ7
2µ7
75
75
32
32
82p
82p
NC
NC
+12v
+12v
JP1
JP1
100
100
#11/12
#11/12
JP4
JP4
100n
100n
100n
100n
#5/6
#5/6
NC
NC
NC
NC
GND
GND
From VD HD
From VD HD
output
output
VD HD
VD HD
SW1
SW1
Input/output
Input/output
1n
1n
1k
1k
NC
NC
GND
GND
10k
10k
220
220
10
10
10
10
10k
10k
#4/12
#4/12
Video
Video
Output
Output
BNC
BNC
GND
GND
+5V
+5V
33k
33k
1k
1k
33k
33k
100k
100k
1k
1k
1n
1n
+5V
+5V
33k
33k
+
+
1k2
1k2
10µ
10µ
47p
47p
75
75
SW2
SW2
4k7
4k7
+5V
+5V
VD, HD
VD, HD
SW1
SW1
67
67
WEN/ EEN
WEN/ EEN
JP2
JP2
PCLK
PCLK
WEN
WEN
JP5
JP5
JP3
JP3
300 mV
300 mV
420 mV
420 mV
TTL
TTL
GND
GND
TTL
TTL
#6/6
#6/6
#9/12
#9/12
#10/12
#10/12
GND
GND