Document
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 chrominance 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 PULBFir\
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.
FAIRCHILD • TBA990
E L E C T R I C A L C H A R A C T E R I S T I C S : T A = 25°C, V + = 1 2 V , See Test Circuit, unless otherwise specified.
CHARACTERISTICS
Supply Current (Ig)
Color Difference Gain R-Y Channel ( A V 4 / 1 3) B-Y Channel (Av7/1ol G-Y Channel
M a x i m u m Color Difference O u t p u t Voltage (Notes 2, 3) R-Y Output (V4 pk-pk) B-Y Output (V7 pk-pk) G-Y Output (V5 pk-pk)
Color Difference DC Output Voltage R-Y Output (V4) B-Y Output (V7) G-Y Output (V5)
Input Resistance of Chroma Inputs (R10, R13)
Input Capacitance of Chroma Inputs (C10, C13) Output Resistance at Color Difference Terminals (R4, R5, R7) Input Resistance of Reference Inputs (R2, R8) Peak-to-Peak PAL Switch Output Voltage ( V 3 pk-pk' Activation Threshold Voltage (V^l Deactivation Threshold Voltage (V-|) Identification Input Current (!-)) O u t p u t Voltage D r i f t (A T a = 4 0 ° C )
DC Output Voltage IV4) DC Output Voltage IV7) DC Output Voltage (V5) Relative DC Output Voltage Change between Channels
CONDITIONS
v10 =
= 50 mV pk-pk
f = 4.4 MHz
(Note 3)
(Notes 2, 3)
v 1 0 = V ^ = 20 mV rms (Sinusoidal) f = 4.4 MHz
(Note 4) I d e n t i f i c a t i o n C i r c u i t is A c t i v e I d e n t i f i c a t i o n C i r c u i t is Inactive
V11 = V12 = 6 V
MIN
1.6 2.0 0.9
800
6.5 -100
-50 -50 -50 -20
NOTES:
1. G - Y o u t p u t is t y p j c a l l y equal t o - 0 . 5 1 ( R - V ) —0.19 ( B - Y ) .
2. Increase V-|o and V 1 3 u n t i l gain is equal t o 0.7 of small signal gain. 3. Reference i n p u t ( V 2 p k . p k a ° d v 8 p k - p k ^ range is 0 . 5 V t o 2 . 0 V . { t y p i c a l l y 1.0 V ) . 4. f 0 = 0.5 x line pulse frequency; V-|4 = 2.0 to 5.0 Vpk-pk {See application information).
TYP 17
3.8 6.8 ( N o t e 1)
7.5 7.5 7.5
3.0 5.0 3.5
MAX
10
5.5 +50 +50 +50 +20
UNITS mA
V/V wv
vpk-pk vpk-pk Vpk-pk
V V V a
pF kn
kn Vpk-pk
V V MA
mV mV mV mV
4-229
FAIRCHILD • TBA990
TEST CIRCUIT
PULSE INPUT
Q
CHROMA INPUT
CHROMA
INPUT
Q
V
56 7
IOENT. INPUT
RV REF
IN
PAL SW OUT
IRY)
(GYI
OUTPUT OUTPUT
(BY)
REF
OUTPUT INPUT
APPLICATION INFORMATION
V-11 = V-I2 = 6.0 V V 9 = 9.5 V
5 . 6 KFL
RY
COLOR DIFFERENCE OUTPUTS
4-231
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 out.