UPD64084 NEC, UPD64084 Datasheet - Page 16

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

3.5
to output 4f
ST0S = 01 on the serial bus causes a clamp pulse to be output from the ST0 pin. It is used as a pedestal clamp pulse
for external ADC. The clamp potential for the pedestal level of external ADC must be determined so that the sampled
value becomes about 256 ±8LSB. Supply converted 10-bit data to the DYCO9 to DYCO0 pins via a 100
using 8-bit ADC (exp. PC659A), Pull down the DYCO1 and DYCO0 pins via 100
AYI pins via a 0.1 F capacitor.
16
Setting up EXADINS = 1 on the serial bus puts the IC in the external ADC mode. In this mode, the ALTF pin is used
In this mode, for ADC in the PD64084, keep the VRTY, VRBY and VCOMY pins open, and pull down the VCLY and
External ADC Connection Method
Remark Serial bus registers setting: EXADINS = 1, ST0S = 01
= 0.8 V
140 IRE
Composite input
SC
p-p
sampling clock pulses, and the DYCO9 to DYCO0 pins are used to receive digital data inputs. Setting up
Figure 3-3. Example of Application Circuit Set Up for External ADC
Clamp Bias
47 k : 1%
15 k : 1%
5 V
0.1
0.1
2.2
0.1
0.1
10
F
F
F
F
F
F
1
F
Data Sheet S16021EJ2V0DS
V
NC
AV
V
AGND
PCL
V
AV
AGND
V
AV
AGND
RT
IN
CL
RB
CC
CC
CC
(Pin 1)
PC659AGS
Clamp pulse
MSB:
LSB:
DGND
OVER
DV
CLK
DB
DB
DB
DB
DB
DB
DB
DB
CC
1
2
3
4
5
6
7
8
10
0.1
10
resistor.
F
100
F
4f
SC
10
ALTF (Pin 73)
DYCO9 (Pin 72): MSB
DYCO8 (Pin 71)
DYCO7 (Pin 70)
DYCO6 (Pin 69)
DYCO5 (Pin 68)
DYCO4 (Pin 67)
DYCO3 (Pin 66)
DYCO2 (Pin 65): LSB
DYCO1 (Pin 64)
DYCO0 (Pin 63)
ST0 (Pin 59)
PD64084
resistor. For