Texas Instruments EUROTEXT CF70200 Manual page 13

UNIVERSAL TELETEXT DECODERS
'EUROTEXT' CF70200
The value of the voltage generated across RL is fixed by:
1. The reference circuit
2. The adjustable current source
3. The resistors R
(RGBSET)
Minimum and maximum output voltages can be calculated using the following equations:
R =
(RGBSET)
R
(RGBSET)
R
L
V
REF
V
L
I
lmin
I
lmax
I
lmin/max
R
The circuit diagram of the RGB outputs is shown on the following page.
DRAFT 11
5.0 RGB OUTPUTS (continued)
and RL.
R V 60
 
L REF
V
L
R, G, B output current determined by this resistor value
Load resistor on R, G, B outputs
Reference voltage
R, G, B output voltage


(typ) 60
0.75 V
REF
 
R R
(RGBSET)
 
1.25 V (typ) 60
REF
 
R R
(RGBSET)
R, G, B output current
Resistor tolerance of R
(RGBSET)
15-Feb-96
'EUROTEXT'
CF70200
11
1Q96