Daewoo 14Q1 User Manual
Page 20
19
No
Name
Description
A flash protection becomes active when this pin is forced >6V. The horizontal
drive is switched-off immediately.
Once the voltage is <6V the horizontal drive is switched-on again via the slow
start procedure.
43
PHI-1 FILTER
The loopfilter connected to pin 43 is suitable for various signal conditions as
strong/weak and VCR signal.
This is achieved by switching of the loopfilter time constant by changing the
PHI-1 output current.
Via I2C bus FOA/B, different time constants can be chosen, including an
automatic mode which gives optimal performance under varying conditions.
44
GROUND
To this pin are connected the IC-substrate and horizontal output.
45
EAST-WEST DRIVE
not used
46
VERT DRIVE +
The vertical drive has a current output. The output is balanced which ensures
47
VERT DRIVE -
a good common mode behavior with temperature and makes the output signal
less sensitive for disturbances.
48
IF INPUT
The PLL frequency range is 32-60MHz with corresponding VCO frequency
49
64-120MHz.
The IF input impedances is 2
in parallel with 3pF and matches the required
load for commonly used SAW filters.
A DC coupling is allowed, so no series capacitors between SAW filter and IF
input are necessary.
50
EHT/OVERVOLTAGE
not used
PROTECT INPUT
51
VERT
This pin requires a capacitor to ground of l00nF +, - 5%.
SAWTOOTH
The optimal sawtooth amplitude is 3.5V and is determined by the external
CAPACITOR
capacitor and charge current.
The sawtooth bottom-level is 2V.
52
REFERENCE
This pin requires a resistor to ground.
CURRENT INPUT
The optimal reference current is 100 . which is determined by this resistor.
53
AGC
The AGC capacitor value is 2.2
and has been defined for an optimal
DECOUPLING
compromise between AGC speed and tilt for all AGC modes
CAPACITOR
(negative/positive modulation).
54
TUNER AGC
This output is used to control (reduce) the tuner gain for strong RF signals.
OUTPUT
The tuner AGC is an open collector output which is acting as a variable
current source to ground.
55
AUDIO
Only a capacitor has to be connected to this pin that defines the deemphasis
DEEMPHASSIS
time constant.
The signal is internally connected through to the Audio switch.
The deemphasis output is fixed, thus not controlled by the volume, and can be
used for SCART.
56
DECOUPLING
This pin requires a capacitor of 10
connected to ground.
SOUND
The pin acts as a low pass filter needed for the DC feedback loop.
DEMODULATOR