IF Amp. NTE1785 Datasheet

NTE1785 Amp. Datasheet pdf. Equivalent

Part NTE1785
Description Integrated Circuit TV IF Amp
Feature NTE1785 Integrated Circuit TV IF Amp w/Demod and AFC (For PNP Tuners) Description: The NTE1785 is an.
Manufacture NTE
Datasheet
Download NTE1785 Datasheet



NTE1785
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–Lead DIP type package designed for
use in color and black and white television receivers using PNP tuners.
Features:
D Gain–Controlled Wide–Band 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, V11–13 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13.2V
Tuner AGC Voltage, V4–13 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12V
Total Power Dissipation, Ptot . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 900mW
Operating Ambient Temperature Range, TA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –25° to +60°C
Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –55° to +125°C
Electrical Characteristics: (TA = +25°C, V11–13 = 12V, f = 38.9MHz unless otherwise specified)
Parameter
Symbol Test Conditions Min Typ Max Unit
Supply Voltage Range
IF Input Voltage for Onset of AGC (RMS Value)
Differential Input Impedance
Zero–Signal Output Level
Top Sync Output Level
IF Voltage Gain Control Range
V11–13
V1–16(rms)
|Z1–16|
V12–13
V12–13
GV
In parallel with 2pF
Note 1
10.2 12.0 13.2
– 100 150
–2–
– 6 ±0.3 –
2.9 3.07 3.2
– 64 –
V
µV
k
V
V
dB
Bandwidth of Video Amplifier
B 3dB
– 6 – MHz
Note 1. So–called “Projected Zero Point”, e.g. with switched demodulator.



NTE1785
Electrical Characteristics (Cont’d): (TA = +25°C, V1113 = 12V, f = 38.9MHz unless otherwise
specified)
Parameter
Symbol
Test Conditions
Min Typ Max Unit
SignaltoNoise Ratio
Differential Gain
S/N Vi = 10mV, Note 2
dG
58 dB
4 10 %
Differential Phase
2 10 deg.
Intermodulation, Blue
1.1MHz, Note 3
46 60 dB
Intermodulation, Yellow
46 50 dB
Intermodulation
3.3MHz, Note 4
46 54 dB
Carrier Signal at Video Output
2nd Harmonic of Carrier at Video Output
4 30 mV
20 30 mV
White Spot Inverter Threshold Level
6.6 V
White Spot Insertion Level
4.7 V
Noise Inverter Threshold Level
1.8 V
Noise Insertion Level
3.8 V
External Video Switch (VCR) Switched Off
Tuner AGC Output Current Range
Tuner AGC Output Voltage
Tuner AGC Output Leakage Current
Maximum AFC Output Voltge Swing
Detuning for AFC Output Voltage Swing
V1413
I4
V413
I4
V513
f
I4 = 10mA
V1413 = 11V, V413 = 12V
of 10V
0
10
1.1 V
10 mA
0.3 V
15 µA
11 V
100 200 kHz
AFC ZeroSignal Output Voltage
(Minumum Gain)
V513
4 6 8V
AFC Switches ON
AFC Switches OFF
V613
V613
3.2
V
– – 1.5 V
Note 2. S/N = VO blacktowhite/Vn(rms) at B = 5MHz.
Note 3. 20 log (VO at 4.4MHz/VO at 1.1MHz) + 3.6dB.
Note 4. 20 log (VO at 4.4MHz/VO at 3.3MHz)
Pin Connection Diagram
IF Input 1
Coupling Cap 2
AGC Delay Input 3
AGC Output 4
AFC Output 5
AFC Switch Input 6
AFC Tank (Sync) 7
AFC Tank (Amp) 8
16 IF Input
15 Coupling Cap
14 AGC Filter
13 GND
12 Video Output
11 VCC
10 AFC Tank (Sync)
9 AFC Tank (Amp)







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