CRT Display Synchronization Deflection Circuit
Overview
The LA7852 is a sync-deflection circuit IC dedicated to CRT
display use. It can be connected to the LA7832/7833, 7837/
7838 (for vertical output use) to form a sync-deflection circuit
that meets every requirement for CRT display use.
So far, ICs for color TV use have been applied to the sync-
deflection circuit for CRT display use, and general-purpose ICs
such as one-shot multivibrator, inverter and a lot of transistors
have been used to form the peripherals such as sync input
interface, horizontal phase shifter. The LA7852 contains these
peripherals on chip and adopts a stable circuit for horizontal
oscillation from 15 kHz to 100 kHz aiming at improving the
characteristics required for CRT display use.
The LA7852 has independent GND pins for the horizontal
block and vertical block, thus facilitating pattern layout for
applications where the LA7852 is used at high frequencies.
Features
.
The vertical pull-in range is approximately 10 Hz at
fv = 60 Hz.
.
The horizontal oscillation frequency can be adjusted stably
from 15 kHz to 100 kHz.
.
The horizontal display can be shifted right/left.
.
The horizontal/vertical sync input can be used intact
regardless of the difference in pulse polarity and pulse width.
.
The AFC feedback sawtooth wave can be obtained by
simply applying a flyback pulse to the IC as a trigger pulse.
.
Any duty of the horizontal pulse can be set.
.
Good vertical linearity because DC bias at vertical output
stage is subjected to sampling control within retrace time.
.
Excellent interlace and vertical jitter characteristics on the
high-definition display because of independent GND pins for
the horizontal block and vertical block.
Package Dimensions
unit : mm
3059-DIP22S
[LA7852]
SANYO : DIP22S
Built-in Functions
[Horizontal Block]
.
AFC
.
Horizontal OSC
.
X-ray protector
.
Horizontal phase shift
.
AFC sawtooth wave generator
.
Horizontal pulse duty setting
[Vertical Block]
.
Vertical OSC
.
Vertical sawtooth wave generator
.
Sampling type DC voltage control
Allowable
power
dissipation,
Pd
max
m
W
Pd max Ta
Ambient temperature, Ta C
Ordering number: EN2781B
Monolithic Linear IC
LA7852
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN
81096HA(II)/9138YT/8228YT,TS No.2781-1/5
Specifications
Maximum Ratings
at Ta = 25C
Parameter
Symbol
Conditions
Ratings
Unit
Maximum supply voltage
V
11
, V
22
14
V
Allowable power dissipation
Pd max
Ta
%
65 C
780
mW
Operating temperature
Topr
20 to +85
C
Storage temperature
Tstg
55 to +125
C
Operating Conditions
at Ta = 25C
Parameter
Symbol
Conditions
Ratings
Unit
Recommended supply voltage
V
11
, V
22
12
V
Operating voltage range
V
11
, V
22
9 to 13.5
V
Recommended vertical pulse input peak value
V
PULSE
5
Vp-p
Operating vertical pulse input peak value range
V
PULSE
2 to 6
Vp-p
Recommended horizontal pulse input peak value
H
PULSE
5
Vp-p
Operating horizontal pulse input peak value range
H
PULSE
2 to 6
Vp-p
Operating Characteristics
at Ta = 25C, V
11
, V
22
= 12 V
Parameter
Symbol
Conditions
min
typ
max
Unit
V
CC11
current dissipation
I
11
12
30
mA
V
CC22
current dissipation
I
22
5
12
mA
Vertical frequency pull-in range
Vp
IN
Vertical sync 60 Hz
10.0
12.0
Hz
Vertical free-running frequency
fv
fv center 55 Hz
50
60
Hz
Increased/reduced voltage
characteristic of vertical
frequency
fv-v
V
22
= 12
1 V, 55 Hz at 12 V
0.1
+0.1
Hz
Midpoint control
threshold level
3.8
4.4
V
Vertical OSC start voltage
Fv
c
st
4.0
V
Temperature characteristic of
vertical frequency
Ta = 10 to +60C
0.028
+0.028 Hz/C
Vertical driver
amplification factor
Gv
12
18
dB
Horizontal AFC DC loop gain
I
AFC
+
0.85
1.6
mA
I
AFC
1.6
0.85
mA
Horizontal free-running
frequency
f
H
f
H
center 15.734 kHz
750
+750
Hz
Horizontal OSC start voltage
f
H
c
st
4.0
V
Increased/reduced voltage
characteristic of horizontal
frequency
f
H
c
v
V
11
= 12
1 V, 15.734 kHz at 12 V
50
+50
Hz
Horizontal OSC warm-up drift
f
H
5 s to 30 min. after application of power
50
+50
Hz
Temperature characteristic of
horizontal frequency
Ta = 10 to +60C
2.9
+2.9 Hz/C
Horizontal output drive current
I
13
6.0
12.0
mA
Increased/reduced voltage
characteristic of phase shifter
delay time
V
11
= 12
1 V
0.5
+0.5
%/V
Temperature characteristic of
phase shifter delay time
Ta = 10 to +60C
0.1
+0.1
%/C
Increased/reduced voltage
characteristic of phase shifter
delay time
V
11
= 12
1 V
1.0
+1.0
%/V
Temperature characteristic of
phase shifter pulse width
Ta = 10 to +60C
0.13
+0.13
%/C
AFC phase comparison center
time
15.734 kHz after FBP input
9.9
11.5
s
LA7852
No.2781-2/5
Parameter
Symbol
Conditions
min
typ
max
Unit
Increased/reduced voltage
characteristic of AFC phase
comparison center time
V
11
= 12
1 V
1.5
+1.5
%/V
Temperature characteristic of
AFC phase comparison center
time
Ta = 10 to +60C
0.2
+0.2
%/C
Comparison waveform
generating
input operation voltage
V
5
0.6
0.9
V
Pin 14 voltage at hold-down
operation start
V
14
0.5
0.8
V
Equivalent Circuit Block Diagram
V
ertical
power
supply
V
ertical
trigger
input
V
ertical
OSC
time
constant
Midpoint
voltage
control
input
V
ertical
sawtooth
wave
generation
V
ertical
drive
output
V
ertical
ground
Horizontal
ground
X-ray
protection
input
Horizontal
drive
output
Horizontal
drive
pulse
width
setting
Horizontal
trigger
input
Phase
adjust
time
constant
NC
Sync
pulse
width
time
constant
FBP
trigger
input
Sawtooth
wave
generating
capacitor
Comparison
voltage
generating
capacitor
AFC
output
Horizontal
OSC
time
constant
Discharge
resistor
Horizontal
power
supply
LA7852
No.2781-3/5
Sample Application Circuit
14'' Color Monitor / fv = 60 Hz, f
H
= 15.734 kHz
( ): Negative pulse
mode
VR2 is fixed after adjustment.
(Note)
Co is connected when
oscillation occurs in vertical
output in Sample Application
Circuit.
(Note) For the LA7853, the vertical pull-in range is
20 Hz at vertical sync 60 Hz.
Unit (resistance:
, capacitance: F)
LA7852
No.2781-4/5
Sample Application Circuit
14'' Color Monitor / fv = 60 Hz, f
H
= 15.734 kHz
LA7850 Family
Type Number
LA7850
LA7851
LA7852
LA7853
Package
DIP-20S
(Slim Type)
DIP-20S
(Slim Type)
DIP-22S
(Shrink Type)
DIP-22S
(Shrink Type)
Differences in
characteristics
Vertical
pull-in range
(fv = 60 Hz)
10 Hz
20 Hz
10 Hz
20 Hz
Ground pin
Horizontal/vertical
common
horizontal/vertical
common
Horizontal/vertical
separated
Horizontal/vertical
separated
No products described or contained herein are intended for use in surgical implants, life-support systems, aerospace equipment,
nuclear power control systems, vehicles, disaster/crime-prevention equipment and the like, the failure of which may directly or
indirectly cause injury, death or property loss.
Anyone purchasing any products described or contained herein for an above-mentioned use shall:
1
Accept full responsibility and indemnify and defend SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors
and all their officers and employees, jointly and severally, against any and all claims and litigation and all damages, cost and
expenses associated with such use:
2
Not impose any responsibility for any fault or negligence which may be cited in any such claim or litigation on SANYO
ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors or any of their officers and employees jointly or severally.
Information (including circuit diagrams and circuit parameters) herein is for example only; it is not guaranteed for volume
production. SANYO believes information herein is accurate and reliable, but no guarantees are made or implied regarding its use
or any infringements of intellectual property rights or other rights of third parties.
This catalog provides information as of August, 1996. Specifications and information herein are subject to change without notice.
( ): Negative pulse mode
VR2 is fixed after adjustment
A05903
LA7852
No.2781-5/5
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