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PDF LM1880 Data sheet ( Hoja de datos )
| Número de pieza | LM1880 | |
| Descripción | No-Holds Vertical/Horizontal | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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June 1987
LM1880 No-Holds Vertical Horizontal
General Description
The LM1880 uses compatible Linear I2L technology to pro-
duce the first T V horizontal and vertical processing system
which completely eliminates the hold controls The heart of
the system is a precision 32 times horizontal frequency VCO
which is designed to use a low-cost ceramic resonator as a
tuning element
The VCO signal is divided down in the horizontal section to
produce a pre-driver output which is locked to negative sync
by means of an on-chip phase detector The vertical output
ramp is injection-locked by vertical sync subject to a sync
window derived from the vertical countdown section A gate
pulse centered on the chroma burst is also provided
Features
Y No frequency set-up required for horizontal or vertical
Y Ceramic resonator frequency reference
Y Accurate horizontal pre-driver duty cycle
Y Vertical sync window referenced to horizontal
Y Precise interlaced vertical output
Y APC loop parameters completely adjustable
Y Vertical retrace time adjustable
Y Chroma burst gate output
Y Internal voltage regulator
Y Improved vertical lock time
Block Diagram
C1995 National Semiconductor Corporation TL H 7915
TL H 7915 – 1
RRD-B30M115 Printed in U S A
1 page  
External Components (Application Circuit)
Component
Rg1
Rg2
Rf
Cf
C1
Rh
Ch
Rv
Cv
C10
Typical
Value
30k
1 5k
3 9k
0 1 mF
0 1 mF
7 5k
510 pF
16k
0 05 mF
0 1 mF
Comments
Burst Gate series resistor
Burst Gate shunt resistor works
with Rg1 to divide flyback pulse
and set Burst Gate amplitude
Rg2
VB G pk e Rg1 a Rg2 VFLYBACK
Flyback Sawtooth integrator
resistor works with Cf to
integrate flyback pulse to 1 Vp-p
min sawtooth For Cf e 0 1 mF
85VFLYBACK
VSAW p-p j
Rf
Flyback Sawtooth integrator
capacitor
Sawtooth input coupling
capacitor
Horizontal Sync input coupling
resistor
Rh e 0 4 c VSYNC p-p kX
Horizontal Sync input coupling
capacitor blocks vertical sync
components
Vertical sync input integrator
resistor
Vertical sync input integrator
capacitor works with Rv to
integrate composite sync to b2
Vp-p min pulse For
N T S C sync Vert sync j
1 4 c 10b4
(Comp sync) Vp-p
RvCv
Vertical sync coupling capacitor
Rt 16k Vertical Retrace timing resistor
Component
Ct
Ro
Co
Rs
CL
Rr
C9
Rd
C2
Rx
Ry
Cc
Typical
Value
0 05 mF
2k
130 pF
510X
1000 pF
510X
0 1 mF
1 2k
0 01 mF
3 3k
(100k
1 mF
Comments
Vertical Retrace timing capacitor
works with Rt to determine ON
time of vertical ramp switch at
pin 12
tV RETRACE j 0 75 RtCt sec
Oscillator phase shift resistor
Works with Ro to produce 45 lag
required by VCO phase shifter
Defines Q of ceramic resonator
tuned network which affects
VCO control curve
Completes VCO loop with phase
lag required to sustain oscillation
and suppress resonator
overtones
Series resistor to device supply
pin 9 Must supply sufficient
current to activate internal shunt
regulator
V(unreg) b 9V
Rr e
0 03
X
Device supply decoupling
capacitor
Horizontal pre-driver output
resistor supplies base current to
Horizontal driver transistor when
pin 8 is OFF
Horizontal APC loop filter high
frequency roll-off C2 also
prevents signal on loop filter from
saturating phase detector output
Rx RY and Cc form the Horizontal
APC loop filter See Applications
Information to modify loop
parameters
5
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet LM1880.PDF ] | |
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