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PDF TBA990 Data sheet ( Hoja de datos )
| Número de pieza | TBA990 | |
| Descripción | Pal TV Chroma Demodulator | |
| Fabricantes | Fairchild | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de TBA990 (archivo pdf) en la parte inferior de esta página. Total 5 Páginas | ||
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TBA990J
PAL "TV CHROMA DEMODULATOR
FAIRCHILD LINEAR INTEGRATED CIRCUIT
G E N E R A L D E S C R I P T I O N - T h e T B A 9 9 0 is an i n t e g r a t e d c o l o r d e m o d u l a t o r c i r c u i t for color
television receivers incorporating two active synchronous demodulators for the R-V and B-Y chromi-
nance signals, a matrix (producing the G-Y color difference signal), P A L phase switch and flip-flop.
It is suitable for dc c o u p l e d d r i v e t o t h e p i c t u r e tube. W h e n associated w i t h t h e m a t r i x i n t e g r a t e d
circuit (TBA530) it provides RGB output signals.
Special a t t e n t i o n has been given in the design to m i n i m i z i n g dc level d r i f t w i t h temperature and
d i r e c t i n t e r f a c e w i t h T B A 5 3 0 , T B A 5 4 0 and T B A 5 6 0 . It is c o n s t r u c t e d on a single s i l i c o n c h i p using
the Fairchild Planar* process.
• DOUBLE BALANCED SYNCHRONOUS DEMODULATOR
• INTERNAL DECODING MATRIX
• INTERNAL PAL SWITCH
• PROVISION FOR OUTPUT DC LEVEL MATCHING
• MINIMIZED DC LEVEL DRIFT WITH TEMPERATURE
• SIMULTANEOUS DC ADJUSTMENT ON CHROMA OUTPUTS
CONNECTION DIAGRAM
16-PIN DIP
(TOP VIEW)
PACKAGE OUTLINE 9B
IN L .
NITCH p3-
OUT L -
Y OUT Q
5
v OUT ^
6
L
7
r OUT £
v fltr p8-
iN I—
] GND
15
] NC
I LINE PULBF-
ir\
I R V CHROMA
• 6 V CHROMA
ABSOLUTE MAXIMUM RATINGS
Supply Voltage
Internal Power Dissipation
Operating Ambient Temperature
Storage Temperature
Pin T e m p e r a t u r e ( S o l d e r i n g , 10 s)
BLOCK DIAGRAM
B-Y OUTPUT
13.2 V
300 mW
— 20"C to +60 C
- 5 5 ° C to +1 25°C
260°C
ORDER INFORMATION
TYPE
PART NO.
990
990Q
TBA990
TBA990QT
t N o t recommended for new designs
R-V OUTPUT
B-Y
REFERENCE
INPUT
GROUND
0
3-Y CHROMA INPUT
LEVEL ADJUST
6
R-Y DC
LEVEL ADJUST
R - Y C H R O M A INPUT
.
A-cdO
16T* RR E F E R E N C E
3 , PAL
SWITCH
| OUTPUT
' P l a n a r is a p a t e n t e d F a i r c h i l d process.
1 page  
FAIRCHILD • TBA990
APPLICATION INFORMATION (Cont'd)
The function is quoted against the corresponding lead number,
IDENTIFICATION BIAS
1. The PAL flip-flop is stopped, for identification purposes, when the voltage on pin 1 increases above 6 V. This threshold is internally
generated and has a proportional behavior w i t h the 12 V supply voltage. The threshold level of 6 V is chosen t o match the o u t p u t
characteristic of the T B A 5 4 0 and has sufficiently high safety margin above the zero chroma signal level of 4 V t o eliminate spurious
identifying.
R-Y SUBCARRIER REFERENCE INPUT
2. A 1 V pk-pk signal is required via a dc blocking capacitor. Under no circumstances should this signal be less than 0.5 V pk-pk. The input
resistance at this pin is typically 5 k f i .
PAL SQUARE WAVE CIRCUIT
3. The amplitude is 3.5 V pk-pk f r o m an emitter follower.
R-Y S I G N A L OUTPUT (G-Y at pin 5 and 8-Y at pin 7)
4. These outputs require no external dc loads except that direct connection must be made via the low pass filter t o the appropriate pins on
the RGB matrix TBA530.
The signals produced are in the following ratios:
VB_Y = 1.78 VR_Y
(a) V G _ y = 0.85 VR_Y
(t»> VG_Y = 0.17 VR_Y
Condition (a) refers to (B-Y) + (R-Y) addition in the G-Y matrix.
Condition (b) refers t o the phase reversed (R-Y) input signal where (G-Y) is obtained by subtraction.
The dc levels should each be adjusted, starting w i t h the (B-Y), t o +7.5 V at nominal supply voltage. However, in a complete circuit
using the T B A 5 3 0 matrix and feedback integrated circuit these dc levels will be adjusted to give the correct setting of the picture tube
drive black levels. The changes in dc level w i t h supply voltage are approximately linear and track together.
The unwanted products of demodulation occurring in the color difference outputs are chiefly 8.86 MHz and harmonics together with a
small amount of 4.43 MHz due to possible unbalance in the demodulators. T o avoid possible troubles in the receiver because of the
radiation of these demodulation products f r o m the RGB drive circuits, filters must be employed in each of the color-difference outputs
from the TBA990. The roll-off should begin at about 1.5 MHz and attention should be given to the parallel resonance of the inductors
t o ensure that no serious attenuation will occur at less than 1.5 MHz. Also, some advantage may be secured by designing the inductor so
that the dip due to its self-resonance occurs at about 4.43 MHz.
G-Y SIGNAL OUTPUT
5. See pin 4.
POSITIVE SUPPLY
6. The m a x i m u m allowable voltage on this pin is 13.2 V.
B-Y SIGNAL OUTPUT
7. See pin 4.
B-Y SUBCARRIER REFERENCE INPUT
8. The requirements here are identical with those for pin 2.
DC L E V E L SETTING FOR B-Y OUTPUT S I G N A L
9. See test circuit diagram, and also pin 4.
CHROMINANCE B-Y INPUT SIGNAL
10. An input signal of approximately 360 m V pk-pk (color bars) is required at this pin. The input impedance is greater than 8 0 0 ft and the
input capacitance is less than 10 pF.
DC L E V E L SETTING FOR G-Y OUTPUT S I G N A L
11. See test circuit diagram, and also pin 5.
DC L E V E L SETTING FOR R-Y OUTPUT S I G N A L
12. See test circuit diagram, and also pin 4.
CHROMINANCE R-Y INPUT SIGNAL
13. A n input signal of approximately 500 mV pk-pk (color bars) is required at this pin. The input imedpance is the same as for pin 10.
LINE PULSE INPUT (flip-flop synchronizing)
14. A waveform derived f r o m the line timebase can be used for synchronizing providing that its amplitude lies between 2 V and 5 V pk-pk.
The trigger point occurs where the negative going edge crosses approximately +0.6 V.
NOT CONNECTED
15. This pin should not be used for external connections.
GROUND
16. See pin 16.
4-232
5 Page | ||
| Páginas | Total 5 Páginas | |
| PDF Descargar | [ Datasheet TBA990.PDF ] | |
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