tda4857, Elektronika i elektryka, Serwisówki
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INTEGRATED CIRCUITS
DATA SHEET
TDA4857PS
I
2
C-bus autosync deflection
controller for PC monitors
Product specification
File under Integrated Circuits, IC02
2000 Jan 31
Philips Semiconductors
Product specification
I
2
C-bus autosync deflection controller for
PC monitors
TDA4857PS
FEATURES
Concept features
·
Full horizontal plus vertical autosync capability
·
Extended horizontal frequency range from
15 to 130 kHz
Output for I
2
C-bus controllable vertical sawtooth and
parabola (for pin unbalance and parallelogram)
·
·
Comprehensive set of I
2
C-bus driven geometry
adjustments and functions, including standby mode
·
Vertical picture size independent of frequency
Very good vertical linearity
·
·
Differential current outputs for DC coupling to vertical
booster
·
Moire cancellation
·
Start-up and switch-off sequence for safe operation of
all power components
·
50 to 160 Hz vertical autosync range.
·
X-ray protection
East-West (EW) section
·
Flexible switched mode B+ supply function block for
feedback and feed forward converter
I
2
C-bus controllable output for horizontal pincushion,
horizontal size, corner and trapezium correction
·
·
Internally stabilized voltage reference
·
Optional tracking of EW drive waveform with line
frequency selectable by I
2
C-bus.
·
Drive signal for focus amplifier with vertical parabola
waveforms
Focus section
·
DC controllable inputs for Extremely High Tension
(EHT) compensation
I
2
C-bus controllable output for vertical parabola
·
·
SDIP32 package.
·
Vertical parabola is independent of frequency and tracks
with vertical adjustments.
Synchronization
·
Can handle all sync signals (horizontal, vertical,
composite and sync-on-video)
GENERAL DESCRIPTION
The TDA4857PS is a high performance and efficient
solution for autosync monitors. All functions are
controllable by the I
2
C-bus.
The TDA4857PS provides synchronization processing,
horizontal and vertical synchronization with full autosync
capability and very short settling times after mode
changes. External power components are given a great
deal of protection. The IC generates the drive waveforms
for DC-coupled vertical boosters such as the TDA486x
and TDA835x.
·
Output for video clamping (leading/trailing edge
selectable by I
2
C-bus), vertical blanking and protection
blanking
·
Output for fast unlock status of horizontal
synchronization and blanking on grid 1 of picture tube.
Horizontal section
I
2
C-bus controllable wide range linear picture position,
pin unbalance and parallelogram correction via
horizontal phase
·
The TDA4857PS provides extended functions e.g. as a
flexible B+ control, an extensive set of geometry control
facilities and an output for vertical focus signals.
Together with the I
2
C-bus driven Philips TDA488x video
processor family, a very advanced system solution is
offered.
·
Frequency-locked loop for smooth catching of horizontal
frequency
·
Simple frequency preset of f
min
and f
max
by external
resistors
·
Low jitter
Soft start for horizontal and B+ control drive signals.
·
Vertical section
I
2
C-bus controllable vertical picture size, picture
position, linearity (S-correction) and linearity balance
·
2000 Jan 31
2
Philips Semiconductors
Product specification
I
2
C-bus autosync deflection controller for
PC monitors
TDA4857PS
QUICK REFERENCE DATA
SYMBOL
PARAMETER
MIN.
TYP.
MAX.
UNIT
V
CC
supply voltage
9.2
-
16
V
I
CC
supply current
70
mA
-
-
I
CC(stb)
supply current during standby mode
-
9
-
mA
VSIZE
vertical size
60
-
100
%
VGA
VGA overscan for vertical size
-
16.8
-
%
VPOS
vertical position
-
±
11.5
-
%
VLIN
vertical linearity (S-correction)
-
2
-
-
46
%
VLINBAL
vertical linearity balance
-
±
2.5
-
%
V
HSIZE
horizontal size voltage
0.13
-
3.6
V
V
HPIN
horizontal pincushion voltage (EW parabola)
0.04
1.42
V
-
V
HEHT
horizontal size modulation voltage
0.02
-
0.69
V
V
HTRAP
horizontal trapezium correction voltage
-
±
0.33
-
V
V
HCOR
horizontal corner correction voltage
-
0.64
-
+0.08
V
HPOS
horizontal position
13
%
-
±
-
HPARAL
horizontal parallelogram
-
±
1
-
%
HPINBAL
EW pin unbalance
-
±
1
-
%
T
amb
ambient temperature
-
20
-
+70
°
C
ORDERING INFORMATION
PACKAGE
TYPE
NUMBER
NAME
DESCRIPTION
VERSION
TDA4857PS
SDIP32
plastic shrink dual in-line package; 32 leads (400 mil)
SOT232-1
2000 Jan 31
3
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EHT compensation
via vertical size
7 V
EHT compensation
via horizontal size
22
k
W
100
nF
(5%)
150
nF
1.2 V
(1%)
VREF
VCAP
VAGC
VSMOD
HSMOD
EWDRV
23
24
22
21
31
11
VERTICAL
SYNC INPUT
AND POLARITY
CORRECTION
VERTICAL
SYNC
INTEGRATOR
VERTICAL
OSCILLATOR
AND AGC
EHT COMPENSATION
EW-OUTPUT
HORIZONTAL PINCUSHION
HORIZONTAL CORNER
HORIZONTAL TRAPEZIUM
HORIZONTAL SIZE
12
VERTICAL OUTPUT
VSYNC
14
VOUT2
HORIZONTAL SIZE
AND
VERTICAL SIZE
VERTICAL LINEARITY
VERTICAL LINEARITY
BALANCE
(TTL level)
13
VOUT1
VIDEO CLAMPING
AND
VERTICAL BLANK
VERTICAL POSITION
VERTICAL SIZE, VOVSCN
clamping
blanking
CLBL
16
OUTPUT
ASYMMETRIC
EW-CORRECTION
or
20
ASCOR
17
HUNLOCK
OUTPUT
HUNLOCK
PROTECTION
AND SOFT START
32
FOCUS
TDA4857PS
VERTICAL
FOCUS
19
18
SDA
SCL
I
2
C-BUS
RECEIVER
X-RAY
I
2
C-BUS REGISTERS
6
4
3
BDRV
BSENS
BOP
V
CC
10
(2)
+
CONTROL
B
CONTROL
APPLICATION
B
+
9.2 to 16 V
SUPPLY
AND
REFERENCE
PGND
7
X-RAY
PROTECTION
COINCIDENCE DETECTOR
FREQUENCY DETECTOR
5
BIN
SGND
25
H/C SYNC INPUT
AND POLARITY
CORRECTION
PLL1 AND
HORIZONTAL
POSITION
PLL2, PARALLELOGRAM,
PIN UNBALANCE AND
SOFT START
HORIZONTAL
OUTPUT
STAGE
HSYNC
HDRV
15
HORIZONTAL
OSCILLATOR
8
(TTL level)
26
27
28
29
30
1
9
2
(video)
HPLL1
HBUF
HREF
HCAP
HPLL2
MHB658
HFLB
XSEL
XRAY
10 nF
8.2 nF
R
HBUF
(2%)
W
100 nF
3.3 k
(1)
8.2
nF
R
HREF
(1%)
(1)
For the calculation of f
H
range see Section “Calculation of line frequency range”.
(2)
See Figs 21 and 22.
Fig.1 Block diagram and application circuit.
Philips Semiconductors
Product specification
I
2
C-bus autosync deflection controller for
PC monitors
TDA4857PS
PINNING
SYMBOL
PIN
DESCRIPTION
HFLB
1
horizontal flyback input
XRAY
2
X-ray protection input
BOP
3
B+ control OTA output
BSENS
4
B+ control comparator input
BIN
5
B+ control OTA input
BDRV
6
B+ control driver output
PGND
7
power ground
HDRV
8
horizontal driver output
XSEL
9
select input for X-ray reset
V
CC
10
supply voltage
EWDRV
11
EW waveform output
VOUT2
12
vertical output 2 (ascending sawtooth)
VOUT1
13
vertical output 1 (descending sawtooth)
VSYNC
14
vertical synchronization input
HSYNC
15
horizontal/composite synchronization input
CLBL
16
video clamping pulse/vertical blanking output
HUNLOCK
17
horizontal synchronization unlock/protection/vertical blanking output
SCL
18
I
2
C-bus clock input
SDA
19
I
2
C-bus data input/output
ASCOR
20
output for asymmetric EW corrections
VSMOD
21
input for EHT compensation (via vertical size)
VAGC
22
external capacitor for vertical amplitude control
VREF
23
external resistor for vertical oscillator
VCAP
24
external capacitor for vertical oscillator
SGND
25
signal ground
HPLL1
26
external filter for PLL1
HBUF
27
buffered f/v voltage output
HREF
28
reference current for horizontal oscillator
HCAP
29
external capacitor for horizontal oscillator
HPLL2
30
external filter for PLL2/soft start
HSMOD
31
input for EHT compensation (via horizontal size)
FOCUS
32
output for vertical focus
2000 Jan 31
5
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