UPD64084 NEC, UPD64084 Datasheet - Page 28

• Manufacturer Part Number: UPD64084
• Description: THREE-DIMENSIONAL Y/C SEPARATION LSI WITH ON-CHIP MEMORY
• Manufacturer: NEC

12. VIDEO SIGNAL OUTPUT BLOCK
without performing D/A conversion.
12.1 Digital YC Output Processing
signals in straight binary and 10 bits of C signals in offset binary. And ALTF pin outputs alternative flag of Y or C
signals. When ALTF = 'L' means "C Signal Outputs", when ALTF = 'H' means "Y Signal Outputs".
When the DYCO pins are not used, setting DYCOS = 1x on the serial bus reduces radiation noise of these pins.
digital YC output is not available.
12.2 Video Signal Output Level
is input (see 3. VIDEO SIGNAL INPUT BLOCK).
28
The video signal output block can convert digital video signals to analog form. It can also output digital video signals
When setting up DYCOS = 00 on the serial bus, DYCO9 (MSB) to DYCO0 (LSB) pins alternately output 10 bits of Y
When setting up DYCOS = 1x on the serial bus, DYCO9 (MSB) to DYCO0 (LSB) and ALTF pins are high-impedance.
When the external ADC is used, DYCO9 to DYCO0 pins are used as the digital input terminal of video signal. So the
Figure 12-2 shows sample waveforms that would be observed at the AYO and ACO pins after a typical video signal
C signal input
Y signal input
DYCOS1
Y signal output
C signal output
Digital YC / alternate flag output
4f
processing
processing
SC
,910f
H
Figure 12-1. Video Signal Output Block Diagram
System clock (4f
10
10
10-bit DAC
CLK
(Z
2ch
SC
Data Sheet S16021EJ2V0DS
)
1
)
CBPY
CBPC
AGND
AVDD
ACO
AYO
10
0.1
0.1
0.1
Supply voltage 2.5 V for analog block
F
F
F
F
Supply voltage
Analog Y output
Analog C output
PD64084