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Ordering number: EN2781B
Monolithic Linear IC
LA7852 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 syncdeflection 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.
Package Dimensions
unit : mm
3059-DIP22S
[LA7852]
SANYO : DIP22S
Features
Allowable power dissipation, Pd max - mW
. The vertical pull-in range is approximately 10 Hz at 60 Hz. . fv = horizontal oscillation frequency can be adjusted stably The 15 kHz 100 kHz. . fromhorizontaltodisplay can be shifted right/left. The . The horizontal/vertical sync input can be used intact of the difference pulse polarity and pulse . regardlessfeedback sawtoothinwave can be obtained by width. The AFC a flyback as . simply applying horizontalpulse to thebeICset. a trigger pulse. Any duty of the pulse can . Good vertical linearity because DC bias at vertical output sampling within retrace time. . stage is subjected toand verticalcontrolcharacteristics on the Excellent interlace jitter
high-definition display because of independent GND pins for the horizontal block and vertical block.
Pd max - Ta
Ambient temperature, Ta - C
Built-in Functions
[Horizontal Block] [Vertical Block]
. AFC . Horizontal OSC . X-ray protector . Horizontal phase shift . AFC sawtooth wave generator . Horizontal pulse duty setting
. Vertical OSC . Vertical sawtooth wave generator . Sampling type DC voltage control
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81096HA(II)/9138YT/8228YT,TS No.2781-1/5
LA7852
Specifications
Maximum Ratings at Ta = 25C
Parameter Maximum supply voltage Allowable power dissipation Operating temperature Storage temperature Symbol V11, V22 Pd max Topr Tstg Ta % 65 C Conditions Ratings 14 780 -20 to +85 -55 to +125 Unit V mW C C
Operating Conditions at Ta = 25C
Parameter Recommended supply voltage Operating voltage range Recommended vertical pulse input peak value Operating vertical pulse input peak value range Recommended horizontal pulse input peak value Operating horizontal pulse input peak value range Symbol V11, V22 V11, V22 VPULSE VPULSE HPULSE HPULSE Conditions Ratings 12 9 to 13.5 5 2 to 6 5 2 to 6 Unit V V Vp-p Vp-p Vp-p Vp-p
Operating Characteristics at Ta = 25C, V11, V22 = 12 V
Parameter VCC11 current dissipation VCC22 current dissipation Vertical frequency pull-in range Vertical free-running frequency Increased/reduced voltage characteristic of vertical frequency Midpoint control threshold level Vertical OSC start voltage Temperature characteristic of vertical frequency Vertical driver amplification factor Horizontal AFC DC loop gain Horizontal free-running frequency Horizontal OSC start voltage Increased/reduced voltage characteristic of horizontal frequency Horizontal OSC warm-up drift Temperature characteristic of horizontal frequency Horizontal output drive current Increased/reduced voltage characteristic of phase shifter delay time Temperature characteristic of phase shifter delay time Increased/reduced voltage characteristic of phase shifter delay time Temperature characteristic of phase shifter pulse width AFC phase comparison center time Symbol I11 I22 Vp IN fv fv-v Conditions min 12 5 10.0 50 -0.1 3.8 Fvcst Ta = -10 to +60C Gv IAFC+ IAFC- fH fHcst fHcv fH V11 = 12 1 V, 15.734 kHz at 12 V 5 s to 30 min. after application of power Ta = -10 to +60C I13 V11 = 12 1 V Ta = -10 to +60C V11 = 12 1 V Ta = -10 to +60C 15.734 kHz after FBP input -50 -50 -2.9 6.0 -0.5 -0.1 -1.0 -0.13 9.9 fH center 15.734 kHz -0.028 12 0.85 -1.6 -750 typ max 30 12 12.0 60 +0.1 4.4 4.0 Unit mA mA Hz Hz Hz V V
Vertical sync 60 Hz fv center 55 Hz V22 = 12 1 V, 55 Hz at 12 V
+0.028 Hz/C 18 1.6 -0.85 +750 4.0 +50 +50 dB mA mA Hz V Hz Hz
+2.9 Hz/C 12.0 +0.5 +0.1 +1.0 +0.13 11.5 mA %/V %/C %/V %/C s
No.2781-2/5
Parameter Increased/reduced voltage characteristic of AFC phase comparison center time Temperature characteristic of AFC phase comparison center time Comparison waveform generating input operation voltage Pin 14 voltage at hold-down operation start
Horizontal trigger input Vertical power supply
V14
V5
Symbol
Equivalent Circuit Block Diagram
Phase adjust time constant Vertical trigger input Vertical OSC time constant Midpoint voltage control input Vertical sawtooth wave generation Vertical drive output Vertical ground Horizontal ground X-ray protection input Horizontal drive output Horizontal drive pulse width setting 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
V11 = 12 1 V
Ta = -10 to +60C
LA7852
Conditions
Horizontal power supply
min
-1.5
-0.2
0.5 0.8 V
0.6 0.9 V
typ max +1.5
+0.2 %/C
Unit
%/V
No.2781-3/5
LA7852
Sample Application Circuit
14'' Color Monitor / fv = 60 Hz, fH = 15.734 kHz
(Note) Co is connected when oscillation occurs in vertical output in Sample Application Circuit.
( ): Negative pulse mode VR2 is fixed after adjustment.
(Note) For the LA7853, the vertical pull-in range is 20 Hz at vertical sync 60 Hz.
Unit (resistance: , capacitance: F)
No.2781-4/5
LA7852
Sample Application Circuit
14'' Color Monitor / fv = 60 Hz, fH = 15.734 kHz
( ): Negative pulse mode
VR2 is fixed after adjustment
A05903
LA7850 Family
Type Number Package Differences in characteristics Vertical pull-in range (fv = 60 Hz) Ground pin LA7850 DIP-20S (Slim Type) 10 Hz LA7851 DIP-20S (Slim Type) 20 Hz LA7852 DIP-22S (Shrink Type) 10 Hz LA7853 DIP-22S (Shrink Type) 20 Hz
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.
No.2781-5/5

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