NTE1785
Integrated Circuit
TV IF Amp
w
/Demod and AFC
(For PNP Tuners)
Description:
The NTE1785 is an IF amplifier and demodulator circuit in a 16鈥揕ead DIP type package designed for
use in color and black and white television receivers using PNP tuners.
Features:
D
Gain鈥揅ontrolled Wide鈥揃and Amplifier Providing Complete IF Gain
D
Synchronous Demodulator
D
White Spot Inverter
D
Video Preamplifier with Noise Protection
D
AFC Circuit which can be Switched ON/OFF by a DC Level (e.g. During Tuning)
D
AGC Circuit with Noise Gating
D
Tuner AGC Output (PNP Tuners)
D
VCR Switch which Switches Off the Video Output (e.g. For Insertion of a VCR Playback Signal)
Absolute Maximum Ratings:
Supply Voltage, V
11鈥?3
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13.2V
Tuner AGC Voltage, V
4鈥?3
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12V
Total Power Dissipation, P
tot
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 900mW
Operating Ambient Temperature Range, T
A
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 鈥?5擄 to +60擄C
Storage Temperature Range, T
stg
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 鈥?5擄 to +125擄C
Electrical Characteristics:
(T
A
= +25擄C, V
11鈥?3
= 12V, f = 38.9MHz unless otherwise specified)
Parameter
Supply Voltage Range
IF Input Voltage for Onset of AGC (RMS Value)
Differential Input Impedance
Zero鈥揝ignal Output Level
Top Sync Output Level
IF Voltage Gain Control Range
Bandwidth of Video Amplifier
Symbol
V
11鈥?3
V
1鈥?6(rms)
|Z
1鈥?6
|
V
12鈥?3
V
12鈥?3
G
V
B
3dB
In parallel with 2pF
Note 1
Test Conditions
Min
10.2
鈥?/div>
鈥?/div>
鈥?/div>
2.9
鈥?/div>
鈥?/div>
Typ
12.0
100
2
6
鹵0.3
3.07
64
6
Max
13.2
150
鈥?/div>
鈥?/div>
3.2
鈥?/div>
鈥?/div>
Unit
V
碌V
k鈩?/div>
V
V
dB
MHz
Note 1. So鈥揷alled 鈥淧rojected Zero Point鈥? e.g. with switched demodulator.
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