參數(shù)資料
型號: TDA8840
廠商: NXP Semiconductors N.V.
英文描述: I2C-bus controlled PAL/NTSC/SECAM TV processors
中文描述: I2C總線控制的PAL / NTSC制式/ SECAM電視處理器
文件頁數(shù): 60/68頁
文件大?。?/td> 316K
代理商: TDA8840
December 16, 1997
60
Philips Semiconductors
Tentative Device Specification
I
2
C-bus controlled PAL/NTSC/SECAM TV
processors
TDA884X/5X-N2 series
East-West output stage
In order to obtain correct tracking of the vertical and
horizontal EHT-correction, the EW output stage should be
dimensioned as illustrated in Fig.24.
Resistor R
EW
determines the gain of the EW output stage.
Resistor R
c
determines the reference current for both the
vertical sawtooth generator and the geometry processor.
The preferred value of R
c
is 39 k
which results in a
reference current of 100
μ
A (V
ref
= 3.9 V).
The value of R
EW
must be:
Example: With V
ref
= 3.9 V; R
c
= 39 k
and V
scan
= 120 V
then R
EW
= 68 k
.
R
EW
R
c
V
18
×
V
ref
----------------------
×
=
handbook, full pagewidth
MLA744 - 1
TDA8366
884X
HORIZONTAL
DEFLECTION
STAGE
DIODE
MODULATOR
VDD
Vscan
VEW
Rew
EW output
stage
EWD
Csaw
100 nF
(5%)
Vref
Rc
39 k
(2%)
Iref
43
45
49
51
50
52
Fig.24 East-West output stage.
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