TDA9535 STMicroelectronics, TDA9535 Datasheet - Page 8

• Manufacturer Part Number: TDA9535
• Manufacturer: STMicroelectronics

Specifications of TDA9535

• Single Supply Voltage (typ): Not RequiredV
• Single Supply Voltage (min): Not RequiredV
• Single Supply Voltage (max): Not RequiredV
• Mounting: Through Hole
• Lead Free Status / RoHS Status: Supplier Unconfirmed

TDA9535
8 VIDEO RESPONSE OPTIMIZATION
The dynamic video response is optimized by care-
fully designing the supply decoupling of the video
board
Section 8.2), then by adjusting the input/output
component network (see Section 8.3).
Figure 5. Video response optimization for one channel
8.1 Supply decoupling
The decoupling of V
quality HF capacitors (respectively C10 and C12)
close to the device is necessary to improve the dy-
namic performance of the video signal.
8.2 - Tracks
Careful attention has to be given to the three out-
put channels of the amplifier.
8/15
TDA9207
TDA9209
(
– Capacitor: The parasitic capacitive load on the
– Cross talk: Output and input tracks must be set
*
): To be connected as close as possible to the device
amplifier outputs must be as small as possible.
Figure 11
the
Reducing this capacitive load is achieved
moving away the output tracks from the other
tracks (especially ground) and by using thin
tracks (<0.5mm), see
apart. We recommend to install input and out-
put tracks on opposite sides of the amplifier.
Once again, this is achievable by using thin
tracks (<0.5 mm) to pass through the pin of the
device, see
t
R
(see
/t
F
when the capacitive load increases.
clearly shows the deterioration of
15/50
Section 8.1),
Figure 13
R20
4.7 F
C11
CC
IN
and V
Figure
(b).
TDA9535/36
the
V
CC
DD
13.
V
REF
through good
tracks
C10(
100nF
GNDS
*
)
+
-
(see
C12(
100nF
V
*
DD
)
For dynamic measurements such as rise/fall time
and bandwidth, a 8pF load is used (total load in-
cluding the parasitic capacitance of the PC board
and CRT Socket).
8.3 - Network adjustment
Video response is always a compromise between
several parameters. An improvement of the rise/
fall time leads to a deterioration of the overshoot.
The recommended way to optimize the video re-
sponse is:
We recommend our customers to use the sche-
matic shown on
video board and then to apply the optimization
they need.
– Length: Connection between amplifier output
1 To set R10+R11 for arcing protection (min.
2. To adjust R20 and R10+R11.
3. To adjust L1
GND
and cathode must be as short and direct as
possible.
300
Increasing their value increases the
t
Increasing L1 speeds up the device and
increases the overshoot.
R
/t
F
values and decrease the overshoot
OUT
)
4.7 F
C24
150
R10
Figure 5
0.39 H
as a starting point for the
L1
150
R11
CRT