tda4680wp NXP Semiconductors, tda4680wp Datasheet - Page 17

• Manufacturer Part Number: tda4680wp
• Description: Video Processor With Automatic Cut-off And White Level Control
• Manufacturer: NXP Semiconductors

Philips Semiconductors
Notes to the characteristics
1. The values of the (B
2. The pins are capacitively coupled to a low ohmic source, with a recommended maximum output impedance of 600 .
3. The white potentiometers affect the amplitudes of the RGB output signals including the white measurement pulses.
4. The RGB outputs at pins 24, 22 and 20 are emitter followers with current sources.
5. Sandcastle pulses are compared with internal threshold voltages independent of V
6. A sandcastle pulse with a maximum voltage equal to (V
7. Average beam current limiting reduces the contrast, at minimum contrast it reduces the brightness.
8. Peak drive limiting reduces the RGB outputs by reducing the contrast, at minimum contrast it reduces the brightness.
1996 Oct 25
I
f
V
V
I
I
t
t
t
t
I
V
V
I
I
I
t
t
t
2
SCL
IL
IH
L
H
r
f
2
IL
IH
OL
r
f
SU;DAT
SYMBOL
C-bus transceiver clock SCL (pin 28)
IL
IH
C-bus transceiver data input/output SDA (pin 27)
IL
IH
Video processor with automatic cut-off
and white level control
separate the components of the sandcastle pulse. The particular component is generated when the voltage on pin 14
exceeds the defined internal threshold voltage.
The internal threshold voltages (control bit SC5 = 0) are:
The internal threshold voltages (control bit SC5 = 1) are:
The maximum RGB outputs are determined via the I
the maximum voltage, peak drive limiting is delayed by one horizontal line.
1.5 V for horizontal and vertical blanking pulses
3.5 V for horizontal pulses
6.0 V for the burst key pulse.
1.5 V for horizontal and vertical blanking pulses
3.5 V for the burst key pulse.
input frequency range
LOW level input voltage
HIGH level input voltage
LOW level input current
HIGH level input current
clock pulse LOW
clock pulse HIGH
rise time
fall time
LOW level input voltage
HIGH level input voltage
LOW level input current
HIGH level input current
LOW level output current
rise time
fall time
data set-up time
PARAMETER
Y) and (R
Y) colour difference input signals are for a 75% colour-bar signal.
V
V
V
2
C-bus under sub-address 0AH. When an RGB output exceeds
28
27
27
17
= 0.4 V
= 0.4 V
= 0.4 V
P
CONDITIONS
+ 0.7 V) is obtained by limiting a 12 V sandcastle pulse.
0
3.0
4.7
4.0
3.0
3.0
0.25
MIN.
10
10
P
. The threshold voltages
TYP.
Product specification
100
1.5
6.0
10
1.0
0.3
1.5
6.0
10
1.0
0.3
TDA4680
MAX.
kHz
V
V
V
V
mA
UNIT
A
A
s
s
s
s
A
A
s
s
s