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TDA1330<br />

LOW~LEVEL VIDEO DETECTOR<br />

. TUNED CIRCUIT<br />

I CARRIE<br />

·....----+-0 ~~~~~;<br />

::PUT C7 >----l--t---,<br />

4<br />

2.5k 8. u.<br />

+-4_-~_-----~-~~~--_6----~~~~4_--~~~~_oGND<br />

FIG. 2 Internal Circuitry<br />

CARRIER<br />

OUTPUT<br />

TDA· 1330<br />

2 3 4<br />

6.8k 3.3k<br />

AUXILIARY OUTPUT<br />

20V[~J<br />

10V ----<br />

PRIMARY OUTPUT<br />

V<br />

'" e<br />

~<br />

g<br />

0-<br />

:::><br />

D-<br />

o-<br />

:::><br />

0<br />

~<br />

8.0<br />

t"-....<br />

6.0<br />

~<br />

4.0<br />

'"<br />

2.0<br />

o o<br />

--""<br />

I<br />

~ ...... 1<br />

""<br />

Vs'<br />

20Vdc<br />

-........ r----....<br />

....... ~<br />

r-----.<br />

15Vdc<br />

r--.. r-....<br />

-- t::--- I::::::<br />

I~<br />

I<br />

20 40 60<br />

f'45MHz<br />

(unmodulat.~) _<br />

r---. :---....<br />

~<br />

Vi INPUT VOLTAGE (rms)<br />

I::'---. i"""" ~<br />

.......<br />

80<br />

I""-<br />

b<br />

100<br />

mV<br />

FIGURE 3- TEST CIRCUIT<br />

FIGURE 4 -<br />

OUTPUT VOLTAGE<br />

V 8.0<br />

6.0<br />

'" e.<br />

...<br />

~<br />

g<br />

4.0<br />

0-<br />

:::><br />

D-<br />

o-<br />

:::><br />

0<br />

2.0<br />

g<br />

~<br />

o<br />

V<br />

./ ~<br />

V<br />

V<br />

./ V<br />

./ VI '0 l/<br />

V<br />

V /<br />

~VI=40mV<br />

V<br />

8.0 10 12 14 16 18 20 22 24<br />

Vs SUPPLY VOLTAGE<br />

FIGURE 5- OUTPUT VOLTAGE<br />

~<br />

Vs' 20V<br />

900/0 MOD<br />

fM'lkHz<br />

fe' 45 MHz<br />

Q'30<br />

" ~<br />

'"<br />

/'<br />

L<br />

L<br />

lL<br />

10 20 30 40 50 60 70 80 90 100<br />

mV<br />

V INPUT CARRIER LEVEL (rma)<br />

. FIGURE 6- DETECTOR LINEARITY<br />

8-44

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