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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 perform 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 +55C), PD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 750mW Derate Above +55C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.9mW/C Operating Ambient Temperature Range, Topr . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -40 to +85C Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -65 to +150C Lead Temperature (During Soldering, 1/16" from case, 10sec max), TL . . . . . . . . . . . . . . . . . +265C
Electrical Characteristics: (TA = +25C, +12-V Supply) Parameter Operating Supply Current Supply Current Initial Alignment Bandwidth 45.75-MHz Response Skew (Pole Shift) Maximum Gain AGC Gain Reduction Sensitivity AGC Delay 1 AGC Delay 2 Noise Picture/Noise Sync Output IF AGC A@ B@ Bar (100 IRE) To Sync Sync Tip Input Impedance 1 2 50mV 5mV Note 14 Note 15 Note 1 Note 13 Test Conditions Note 1, I1 + I2 + I11 + I14 Note 2, I1 + I2 + I11 + I14 Note 3, Fixture Tune Voltage Note 4 Note 5 Note 6 Note 16 Note 6 Notes 7, 9 Notes, 8, 9 Note 10 Note 11 Note 12 Min - 15 0 55 35 - - 1.5 0 0 - 55 4.5 4.5 - 95 90 2 1.4 - Typ 40 20.5 8 70 60 80 80 3 0.75 100 9 57 5 5 6Vp-p - - 2.5 1.8 1K Max 60 30 15 85 85 - - - 1 150 11 - 6 6 - 110 105 3 2.2 - Ratio V Ref % Unit mA mA V % % dB dB V mA A mV(rms) dB Vp-p
C @ 100mV
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 50 termination and sweep width of 10MHz centered at 44MHz. Apply sweep signal (without 50 termination) to test-fixture 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 response at 42.17MHz and 45.75MHz are equal. This corresponds to a 5 to 8V peak-to-peak 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). Adjust AGC bias votlage so that the response at 45.75MHz is 3V above GND. Measure response 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 200V signal at 45.75MHz (as measured across an external 50 termination), 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 5.2-dB attenuator.
Note 7. Retain tune voltage. With AGC bias open and video input switch closed, apply a 15mV(rms) signal (as measured across an external 50 termination) 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 150A, 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 12K resistor may be connected to a +12V supply or a 24K resistor 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 50 termination) 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 bar-modulated IF signal to the fixture IF input. Modulation should be set at 87.5%. Close the video input switch. Using an external 75 to 50 matching pad and 50 step attenuators, adjust the modulated IF signal to a 50mV equivalent (141.5mVp-p signal on a wide-band 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 (14.5mVp-p). Output at Pin12 is 9Vp-p to 12Vp-p. 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 mVp-p). 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 1st Amp Output Input GND 1st Amp Input AGC Filter Reverse AGC Output Forward AGC Output Key Pulse Input
1 2 3 4 5 6 7 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
16
9
1
8
.870 (22.0) Max .200 (5.08) Max
.260 (6.6) Max
.100 (2.54) .700 (17.78)
.099 (2.5) Min

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