TDA4680 Philips Semiconductors, TDA4680 Datasheet - Page 16

• Manufacturer Part Number: TDA4680
• Description: Video processor with automatic cut-off and white level control
• Manufacturer: Philips Semiconductors

Philips Semiconductors
1996 Oct 25
Automatic cut-off and white level control (pins 19 and 18); notes 9 to 11; see Fig.8
V
I
V
V
V
D
REFERENCE LEVEL
I
R
Storage of cut-off control voltage/output clamping voltage (pins 25, 23 and 21)
Storage of leakage information (pin 17)
V
Hue control (under I
nominal voltage and data byte 00H for minimum voltage); note 12
V
I
19
18
int
I
I
SYMBOL
V
V
19
24,22,20
19(th)
ref
17
26
Video processor with automatic cut-off
and white level control
ATA BYTE
18
21/23/25
17
19
19
07H
permissible voltage (also during
scanning period)
output current
input current
additional input current
warming up amplitude (under I
control; sub-address 0AH)
voltage threshold for picture tube
cathode warming up
internally controlled voltage
difference between V
white level measurement voltage) and
V
input current
internal resistance
white level register (measured value
within tolerance range)
charge and discharge currents
input currents of storage inputs
charge and discharge currents
leakage current
voltage for reset to switch-on below
output voltage
current of the internal current source
at pin 26
FOR RED REFERENCE LEVEL
ref
2
C-bus control; sub-address 03H; data byte 3FH for maximum voltage; data byte 20H for
PARAMETER
MEAS
(cut-off or
,
DATA BYTE
2
C-bus
08H
only during warming up
switch-on delay 1
switch-on delay 1
during leakage
measurement period
3FH (maximum V
20H (nominal V
00H (minimum V
white level measurement
to V
white level measurement
during cut-off
measurement lines
outside measurement
time
during leakage
measurement period
outside time LM
at 3FH
at 20H
at 00H
16
FOR GREEN REFERENCE LEVEL AND DATA BYTE
ref
CONDITIONS
; I
18
800 A
MEAS
MEAS
MEAS
)
)
)
150
1.5
4.8
500
MIN.
0.5
V
5.0
3.0
1.0
100
250
0.3
0.4
3.0
pdl
TYP.
0.7
Product specification
V
0.5
800
0.1
0.1
3.0
1.0
TDA4680
140
MAX.
P
09H
1.4 V
FOR BLUE
mA
V
V
V
V
V
V
mV
mA
mA
V
V
V
V
UNIT
A
A
A
A
A
A