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AGC Processor. NTE842 Datasheet

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AGC Processor. NTE842 Datasheet
















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Part

NTE842

Description

Integrated Circuit Television Video IF Amplifier / Sync Separator / and AGC Processor



Feature


NTE842 Integrated Circuit Television Vid eo IF Amplifier, Sync Separator, and AG C Processor Description: The NTE842 is a monolithic silicon integrated circuit in a 16–Lead DIP type package design ed to perform IF amplification, tuner A GC, and composite sync–separation fun ctions in color or monochrome TV receiv ers. PIN diodes are used in the IF ampl ifiers for gain contro.
Manufacture

NTE Electronics

Datasheet
Download NTE842 Datasheet


NTE Electronics NTE842

NTE842; l, resulting in increased dynamic range and better signal–to–noise ratio. F eatures: D High–Gain Wide–Band IF A mplifiers D Sample–and–Hold Keyed A GC D Composite Sync Separator with Nois e Immunity D Fast AGC using PIN Diodes D Gain Reduction with Excellent Stabili ty D Internal Varactor Pole Shift at Ma x Gain Absolute Maximum Ratings: DC Sup ply Voltage, VCC Between Pin11.


NTE Electronics NTE842

and Pin3, Pin13 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14V B etween 24K connected to Pin6 and Pin3, Pin13 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25V DC Supply Current, IC At Pin1 + Pin2 + Pi n11 + Pin14 at Max. Gain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.


NTE Electronics NTE842

0mA At Pin (Open Collector) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2mA Device Dissipatio n (TA ≤ +55°C), PD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 50mW Derate Above +55°C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..





Part

NTE842

Description

Integrated Circuit Television Video IF Amplifier / Sync Separator / and AGC Processor



Feature


NTE842 Integrated Circuit Television Vid eo IF Amplifier, Sync Separator, and AG C Processor Description: The NTE842 is a monolithic silicon integrated circuit in a 16–Lead DIP type package design ed to perform IF amplification, tuner A GC, and composite sync–separation fun ctions in color or monochrome TV receiv ers. PIN diodes are used in the IF ampl ifiers for gain contro.
Manufacture

NTE Electronics

Datasheet
Download NTE842 Datasheet




 NTE842
NTE842
Integrated Circuit
Television Video IF Amplifier,
Sync Separator, and AGC Processor
Description:
The NTE842 is a monolithic silicon integrated circuit in a 16–Lead DIP type package designed to per-
form IF amplification, tuner AGC, and composite sync–separation functions in color or monochrome
TV receivers.
PIN diodes are used in the IF amplifiers for gain control, resulting in increased dynamic range and
better signal–to–noise ratio.
Features:
D High–Gain Wide–Band IF Amplifiers
D Sample–and–Hold Keyed AGC
D Composite Sync Separator with Noise Immunity
D Fast AGC using PIN Diodes
D Gain Reduction with Excellent Stability
D Internal Varactor Pole Shift at Max Gain
Absolute Maximum Ratings:
DC Supply Voltage, VCC
Between Pin11 and Pin3, Pin13 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14V
Between 24K connected to Pin6 and Pin3, Pin13 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25V
DC Supply Current, IC
At Pin1 + Pin2 + Pin11 + Pin14 at Max. Gain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60mA
At Pin (Open Collector) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2mA
Device Dissipation (TA +55°C), PD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 750mW
Derate Above +55°C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.9mW/°C
Operating Ambient Temperature Range, Topr . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –40° to +85°C
Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –65° to +150°C
Lead Temperature (During Soldering, 1/16” from case, 10sec max), TL . . . . . . . . . . . . . . . . . +265°C




 NTE842
Electrical Characteristics: (TA = +25°C, +12V Supply)
Parameter
Test Conditions
Operating Supply Current
Supply Current
Initial Alignment
Note 1, I1 + I2 + I11 + I14
Note 2, I1 + I2 + I11 + I14
Note 3, Fixture Tune Voltage
Bandwidth 45.75MHz Response Note 4
Skew (Pole Shift)
Note 5
Maximum Gain
Note 6
AGC Gain Reduction
Note 16
Sensitivity
Note 6
AGC Delay 1
Notes 7, 9
AGC Delay 2
Notes, 8, 9
Noise
Note 10
Picture/Noise
Note 11
Sync Output
1 Note 12
2
IF AGC
A @ 50mV Note 13
B @ 5mV
C @ 100mV
Bar (100 IRE) To Sync
Note 14
Sync Tip
Note 15
Input Impedance
Note 1
Min Typ Max Unit
40 60 mA
15 20.5 30 mA
0 8 15 V
55 70 85 %
35 60 85 %
80 dB
80 dB
1.5 3 V
0 0.75 1 mA
0 100 150 µA
9 11 mV(rms)
55 57 dB
4.5 5
4.5 5
6 Vpp
6
6Vpp
95 110
Ref
%
90 105
2 2.5 3 Ratio
1.4 1.8 2.2 V
1K
Note 1. No signal, AGC bias = GND (maximum gain).
Note 2. No signal, AGC bias = +10V (minimum gain).
Note 3. Adjust sweep generator for 50mV(rms) across an external 50termination and sweep width
of 10MHz centered at 44MHz. Apply sweep signal (without 50termination) to testfixture
input. Apply positive voltage (0V to 10V) to AGC bias input on fixture and adjust for a peak
response (44MHz) of 3V above GND while adjusting fixture tune voltage so that the re-
sponse at 42.17MHz and 45.75MHz are equal. This corresponds to a 5 to 8V peaktopeak
response curve on an oscilloscope. Measure the fixture bandwidth tune supply voltage.
Note 4. Retain tune voltage and AGC bias voltage from previous test. Measure response at
45.75MHz with respect to peak response (44MHz)
Note 5. Retain tune voltage. Reduce amplitude of sweep signal 34dB (1mV(rms) across 50). Ad-
just AGC bias votlage so that the response at 45.75MHz is 3V above GND. Measure re-
sponse at 42.17MHz with respect to 45.75MHz.
Note 6. Retain tune voltage. Remove sweep signal. Apply +10V to AGC bias input. Measure video
output, VOH. (The voltage will depend on the individual unit of NTE842 used in the test circuit
and will be between 8 and 11V.) Remove +10V at AGC bias input, and ground the AGC bias
input. Apply a 200µV signal at 45.75MHz (as measured across an external 50termination),
and measure the change in the video output voltage with respect to VOH. Note that the actual
sensitivity in a TV receiver can be higher because the test fixture includes a 5.2dB attenua-
tor.




 NTE842
Note 7. Retain tune voltage. With AGC bias open and video input switch closed, apply a 15mV(rms)
signal (as measured across an external 50termination) at 45.75MHz. As the AGC delay
current is varied from 0 to 1mA, the reverse tuner output voltage should go from high to low,
and forward tuner output from low to high.
Note 8. Same as Note 7, except increase input signal to 60mV(rms). As the delay current is varied
from 0 to 150µA, the reverse tuner output voltage should go from high to low and forward
tuner output from low to high.
Note 9. The reverse tuner AGC output is an open collector. A 12Kresistor may be connected to
a +12V supply or a 24Kresistor to a +24V supply. The output high voltage will be within
1V of the supply voltage.
Note10. Apply a 45.75MHz, 50mV(rms) signal (as measured across an external 50termination) to
the fixture input. Apply a positive DC voltage to the AGC bias input and close the video input
switch. Adjust the AGC bias for a 2V reading at the video output. Measure the AC rms noise.
Note 11. Apply a 100 IRE barmodulated IF signal to the fixture IF input. Modulation should be set
at 87.5%. Close the video input switch. Using an external 75to 50matching pad and
50step attenuators, adjust the modulated IF signal to a 50mV equivalent (141.5mVpp sig-
nal on a wideband oscilloscope). Apply a key pulse to fixture input. Measure amplitude
of 100 IRE bar signal (black level to white level) at video output. (S + N) ÷ N = 20 Log10 (Bar
÷ Noise).
Note12. Signal conditions same as Note 11. Measure amplitude of sync output. Repeat test with IF
input attenuated 20dB (14.5mVpp). Output at Pin12 is 9Vpp to 12Vpp.
Note13. A. Signal conditions same as Note 11. Measure amplitude of 100 IRE bar.
B. Repeat test with IF input attenuated 20dB. B% = 100 x Test 13B ÷ Test 13A.
C. Repeat test with IF input increased 6dB (283 mVpp). C% = 100 x Test 13C ÷ Test 13A.
Note14. Same signal and conditions as Note 11. Measure ratio of 100 IRE bar signal to sync signal
of composite video output. Repeat test with input IF signal increased 6dB.
Note15. The sync tip to ground voltage is equivalent to the keyed AGC threshold. The test signal and
conditions are the same as Note 11. Measure the sync tip to ground voltage at the video
output.
Note16. A typical application circuit includes a tuner having at least 20dB AGC gain reduction.
Pin Connection Diagram
Max Gain Bias 1
1st Amp Output 2
Input GND 3
1st Amp Input 4
AGC Filter 5
Reverse AGC Output 6
Forward AGC Output 7
Key Pulse Input 8
16 2nd Amp Input
15 AGC Delay
14 2nd Amp Output
13 Substrate GND
12 Sync Output
11 (+) 12V Supply
10 Video Input
9 Sync Filter




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