cxa3516r Sony Electronics, cxa3516r Datasheet - Page 46

• Manufacturer Part Number: cxa3516r
• Description: 3-channel 8-bit 165msps A/d Converter Amplifier Pll
• Manufacturer: Sony Electronics

• SYNCSEP circuits for the SYNC signal for the clamp pulse
• SYNC ON GREEN output enable
A SYNC ON GREEN signal is input to the SOGIN1 (Pin 132) or SOGIN2 (Pin 135). The AC coupled signal
is internally sync tip clamped and the minimum level (bottom of sync) is turned into the internally-set DC
level (approximately 2.8V).
The sync tip clamped input signal is separated from the threshold of 165mV (at SYNC DUTY 5%) above
from the bottom of the sync by the SYNCSEP circuit. After this, the signal is output at TTL level from the
SOGOUT pin and used as a reference signal for generating a clamp pulse.
Since no clamp pulse is required for the sync tip clamp, it is possible to output a SYNC signal from the
SOGOUT pin even when there is no external clamp pulse present such as when power supply is turned on.
An input capacitor of 0.1µF is recommended.
A control register can be used to select output either the SYNC signal separated out from the signal input
from the SOGIN1 pin or the SOGIN2 pin by SW SOG O or the previously described PLL SYNC signal
output from the SW PLL circuit.
Output from the SOGOUT pin
SYNCT1, SYNCT2/SYNCP1, SYNCP2/SYNCIN1, SYNCIN2 output selection
The SOGIN1, SOGIN2 and the previously described G/YIN1, G/YIN2 are interlocked as for the 2-ch
selection (Register: RGB In Select).
Input channel selection
The polarity of signals output from the SOGOUT pin can be set by using registers.
When the SOGOUT pin is not used, it is possible to turn off the TTL output using a control register. But it
cannot be set to high impedance.
SYNCT1, SYNCT2: The SYNC signal sync tip clamped and separated from the SOGIN1 and SOGIN2 pins
SYNCP1, SYNCP2: The SYNC signal pedestal clamped and separated from the G/YIN1 and G/YIN2 pins
SYNCIN1, SYNCIN2: The SYNC signal input from the SYNCIN1 and SYNCIN2 pins
Output from the SOGOUT pin
Register: SYNC OUT SW
Register: SOGOUT POL
SOGOUT output polarity
Register: RGB In Select
SOGOUT output status
Register: SOG Enable
SOGIN pin selection
G/YIN pin selection
SYNCT1, SYNCT2
Negative
IN1
IN1
Off
0
0
0
0
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Positive
SYNCP1, SYNCP2 or SYNCIN1, SYNCIN2
IN2
IN2
On
1
1
1
1
CXA3516R