1996 Oct 25
2
Philips Semiconductors
Product specification
Video processor with automatic cut-off
and white level control
TDA4680
FEATURES
Operates from an 8 V DC supply
Black level clamping of the colour difference, luminance
and RGB input signals with coupling-capacitor DC level
storage
Two fully-controlled, analog RGB inputs, selected either
by fast switch signals or via I
2
C-bus
Saturation, contrast and brightness adjustment via
I
2
C-bus
Same RGB output black levels for Y/CD and RGB input
signals
Timing pulse generation from either a 2 or 3-level
sandcastle pulse for clamping, horizontal and vertical
synchronization, cut-off and white level timing pulses
Automatic cut-off control with picture tube leakage
current compensation
Software-based automatic white level control or fixed
white levels via I
2
C-bus
Cut-off and white level measurement pulses in the last
4 lines of the vertical blanking interval (I
2
C-bus selection
for PAL, SECAM, or NTSC, PAL-M)
Increased RGB signal bandwidths for progressive scan
and 100 Hz operation (selected via I
2
C-bus)
Two switch-on delays to prevent discolouration before
steady-state operation
Average beam current and peak drive limiting
PAL/SECAM or NTSC matrix selection via I
2
C-bus
Three adjustable reference voltage levels (via I
2
C-bus)
for automatic cut-off and white level control
Emitter-follower RGB output stages to drive the video
output stages
Hue control output for the TDA4555, TDA4650/T,
TDA4655/T or TDA4657.
GENERAL DESCRIPTION
The TDA4680 is a monolithic integrated circuit with a
colour difference interface for video processing in TV
receivers. Its primary function is to process the luminance
and colour difference signals from multistandard colour
decoders, TDA4555, TDA4650/T, TDA4655/T or
TDA4657, Colour Transient Improvement (CTI) IC,
TDA4565, Picture Signal Improvement (PSI) IC,
TDA4670, or from a feature module.
The required input signals are:
Luminance and negative colour difference signals
2 or 3-level sandcastle pulse for internal timing pulse
generation
I
2
C-bus data and clock signals for microcontroller
control.
Two sets of analog RGB colour signals can also be
inserted, e.g. one from a peritelevision connector and the
other from an on-screen display generator; both inputs are
fully-controlled internally. The TDA4680 includes full
I
2
C-bus control of all parameters and functions with
automatic cut-off and white level control of the picture tube
cathode currents. It provides RGB output signals for the
video output stages.
There is a very similar IC TDA4681 available. The only
differences are in the NTSC matrix.
ORDERING INFORMATION
TYPE NUMBER
PACKAGE
NAME
DESCRIPTION
VERSION
TDA4680
DIP28
plastic dual in-line package; 28 leads (600 mil)
SOT117-1
TDA4680WP
PLCC28
plastic leaded chip carrier; 28 leads
SOT261-2
1996 Oct 25
3
Philips Semiconductors
Product specification
Video processor with automatic cut-off
and white level control
TDA4680
QUICK REFERENCE DATA
SYMBOL
PARAMETER
MIN.
TYP.
MAX.
UNIT
V
P
supply voltage (pin 5)
7.2
8.0
8.8
V
I
P
supply current (pin 5)
-
85
-
mA
V
8(p-p)
luminance input (peak-to-peak value)
-
0.45
-
V
V
6(p-p)
-
(B
-
Y) input (peak-to-peak value)
-
1.33
-
V
V
7(p-p)
-
(R
-
Y) input (peak-to-peak value)
-
1.05
-
V
V
14
3-level sandcastle pulse
H + V
-
2.5
-
V
H
-
4.5
-
V
BK
-
8.0
-
V
2-level sandcastle pulse
H + V
-
2.5
-
V
BK
-
4.5
-
V
V
i(p-p)
RGB input signals at pins 2, 3, 4, 10, 11 and 12 (peak-to-peak value)
-
0.7
-
V
V
o(b-w)
RGB outputs at pins 24, 22 and 20 (black-to-white value)
-
2.0
-
V
T
amb
operating ambient temperature
0
-
70
C
1996 Oct 25
5
Philips Semiconductors
Product specification
Video processor with automatic cut-off
and white level control
TDA4680
PINNING
SYMBOL PIN
DESCRIPTION
FSW
2
1
fast switch 2 input
R
2
2
red input 2
G
2
3
green input 2
B
2
4
blue input 2
V
P
5
supply voltage
-
(B
-
Y)
6
colour difference input
-
(B
-
Y)
-
(R
-
Y)
7
colour difference input
-
(R
-
Y)
Y
8
luminance input
GND
9
ground
R
1
10
red input 1
G
1
11
green input 1
B
1
12
blue input 1
FSW
1
13
fast switch 1 input
SC
14
sandcastle pulse input
BCL
15
average beam current limiting input
C
PDL
16
storage capacitor for peak drive
limiting
C
L
17
storage capacitor for leakage current
WI
18
white level measurement input
CI
19
cut-off measurement input
B
O
20
blue output
C
B
21
blue cut-off storage capacitor
G
O
22
green output
C
G
23
green cut-off storage capacitor
R
O
24
red output
C
R
25
red cut-off storage capacitor
HUE
26
hue control output
SDA
27
I
2
C-bus serial data input/output
SCL
28
I
2
C-bus serial clock input
SYMBOL PIN
DESCRIPTION
Fig.2 Pin configuration for DIP-version.
handbook, halfpage
TDA4680
MED694
1
2
3
4
5
6
7
8
9
10
11
12
13
14
FSW2
R2
G2
B2
VP
-
(B
-
Y)
-
(R
-
Y)
Y
GND
R1
G1
B1
FSW1
SC
SCL
SDA
HUE
CR
RO
CG
GO
CB
BO
CI
WI
CL
CPDL
BCL
28
27
26
25
24
23
22
21
20
19
18
17
16
15
Fig.3 Pin configuration for PLCC-version.
TDA4680WP
MED695
5
6
7
8
9
10
11
VP
-
(B
-
Y)
-
(R
-
Y)
Y
GND
R1
G1
CR
RO
CG
GO
CB
BO
CI
B
2
G
2
R
2
FSW
2
SCL
SDA
HUE
B
1
FSW
1
SC
BCL
C
PDL
C
L
WI
25
24
23
22
21
20
19
12
13
14
15
16
17
18
4
3
2
1
28
27
26
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