Electronic Components Datasheet Search
  English  ▼

Delete All
ON OFF
ALLDATASHEET.COM

X  

Preview PDF Download HTML

STV2001 Datasheet(PDF) 28 Page - STMicroelectronics

Part No. STV2001
Description  I2C SINGLE FREQUENCY DEFLECTION PROCESSOR AND 120 MHz RGB PREAMPLIFIER
Download  46 Pages
Scroll/Zoom Zoom In 100% Zoom Out
Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
Logo 

STV2001 Datasheet(HTML) 28 Page - STMicroelectronics

Zoom Inzoom in Zoom Outzoom out
 28 / 46 page
background image
STV2001
28/46
14.2.5 - X-RAY Protection
X-Ray protection is activated when the ABL input (1 V on Pin 20) is at a low level. It inhibits both H-Drive,
and Vout while Video goes into off-mode.
This activation is internally delayed by 2 lines to avoid erratic detection (short parasitics).
This protection is latched; it may be reset either by switching VCC off or by I
2C (see Figure 13).
Figure 13. Safety Functions Block Diagram
14.3 - VERTICAL PART
14.3.1 - Function
When the synchronization pulse is not present, an
internal current source sets the free running fre-
quency. For an external capacitor, COSC = 150nF,
the typical free running frequency is 100Hz.
The typical free running frequency can be calculat-
ed according to:
fo(Hz) = 1.5 . 10-5 .
A positive TTL level pulse applied on Pin 2 (Vin) is
used to synchronize the ramp in the range [fmin,
fmax] (see Figure 14). This frequency range de-
pends on the external capacitor connected on
Pin 6 (VCAP). A 150nF (
± 5%) capacitor is recom-
mended for 50 Hz to 165 Hz applications.
The typical maximum and minimum frequency, at
25oC and without any correction (S correction),
can be calculated as follows:
f(Max.) = 3.5 x fo and f(Min.) = 0.33 x fo
When an S correction is applied, these values are
slightly modified.
With a synchronization pulse, the internal oscilla-
tor is synchonized immediately but its amplitude
changes. An internal correction then adjusts it in
less than half a second. The ramp top value (Pin 6)
is sampled on the AGC capacitor (Pin 4) at each
clock pulse. A transconductance amplifier modi-
fies the charge current of the capacitor so as to
make the amplitude constant again. We recom-
mend using an AGC capacitor with a low leakage
current. A value lower than 100nA is mandatory.
A good level of stability for the internal closed loop
is obtained by a 470nF
± 5% capacitor value on
Pin 4 (VAGC).
VRB (Pin 8) is used for decoupling the internal 2V
reference voltage by a capacitor.
14.3.2 - I2C Control Adjustments
S correction shapes can then be added to this
ramp. This frequency-independent S correction is
generated internally. Its amplitudes is adjustable
via the I2C. S correction can be inhibited by apply-
ing the selected bits.
Finally, the amplitude of the S corrected ramp is
adjustable via the vertical ramp amplitude control
register.The adjusted ramp is available on Pin 7
(VOUT) to drive an external power stage.
HORIZONTA L
OUTPUT
INHIBITION
VERTICAL
OUTPUT
INHIBITION
S
R
Q
Horizontal Flyback
0.7V
XRAY Protection
V
CC Checking
V
CC
V
CC off or I
2
C Reset
VSCinh
I2C Drive on/off
I2C Ramp on/off
+
20
ABL
+1V
Video-off
1
COSC


Html Pages

1  2  3  4  5  6  7  8  9  10  11  12  13  14  15  16  17  18  19  20  21  22  23  24  25  26  27  28  29  30  31  32  33  34  35  36  37  38  39  40  41  42  43  44  45  46 


Datasheet Download




Link URL




Privacy Policy
ALLDATASHEET.COM
Does ALLDATASHEET help your business so far?  [ DONATE ]  

About Alldatasheet   |   Advertisement   |   Datasheet Upload   |   Contact us   |   Privacy Policy   |   Alldatasheet API   |   Link Exchange   |   Manufacturer List
All Rights Reserved© Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn