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NTE875 Integrated Circuit Video IF Amplifier/PLL Detector System
Description: The NTE875 is a complete video IF signal processing system on a single 28-Lead DIP type package. This device contains a 5-stage gain-controlled IF amplifier, a PLL synchronous amplitude detector, self-contained gated AGC, and a switchable AFC detector. The increased flexibility of the NTE875 makes it suitable for a wide variety of television applications where high quality video or sound carier recovery is required. These include home receiver video IFs, cable and subscription TV decoders, and parallel sound IF/intercarrier detector systems. Typical operating frequencies are 38.9MHz, 45.75MHz, 58.75MHz, and 61.25MHz. Features: D Low Differential Gain and Phase D IF and Detector pin Compatible with NTE878 (Discontinued) D Common-Base IF Inputs for SAW Filters D True Synchronous Video Detector using PLL (Phase Lock Loop) D Excellent Stability at High System Gains D Noise-Average Gated AGC System D Uncommitted AGC Comparator Input D Internal AGC Gate Generator D Superior Small-Signal Detector Linearity D AFC Detector with Adjustable Output Bias D 9MHz Video Bandwidth D Reverse Tuner AGC Output Absolute Maximum Ratings: Power Supply Voltage, V2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15V IF Supply Current, I5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60mA AGC Gate Voltage, V14 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5V Video Output Current, I16 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10mA Phase Lock Loop (PLL) Filter Current, I18 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5mA Detector Input Signal, DET . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1Vrms Power Dissipation, PD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2W Thermal Resistance, Junction-to-Ambient, RthJA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50C/W Junction Temperature, TJ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +125C Operating Temperature Range, Topr . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0C to +70C Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -65C to +150C Lead Temperature (During Soldering, 10sec), TL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +260C
DC Electrical Characteristics: (TA = +25C, VIF = DET = 0, VPH = 4V, VCOMP = 4V, and all switches in position 0 (open) unless otherwise specified)
Parameter 12V Supply Current IF Regulator Voltage IF Input Voltage IF Decouple Offset IF Peaker Voltage (Max Gain) IF Output Current IF Peaker Voltage (Min Gain) Detector Input Voltage Limiter Tank Voltage AFC Tank Voltage VCO Tank Voltage AGC Sync Threshold AGC Filter Leakage Current AGC Filter Charge Current AGC Filter Discharge Current RF AGC Leakage Current RF AGC Output Current Symbol I1 + I2 V5 V7, V8 V3, V4 I1 V3, V4 V28 Test Conditions VAGC = 6.7V, VCOMP = 6V VAGC = 6.7V, SW4 Position 1 VAGC = 2V, SW2, 3, 4 Position 1 VAGC = 2V, SW2, 3, 4 Position 1 VAGC = 9V, SW2, 3, 4 Position 1, Measure V1, I1 = (12 - V1)/50 VAGC = 9V, SW2, 3, 4 Position 1 VAGC = 6.7V, SW1, 4 Position 1 Min 35 5.8 3.2 - 2.3 3.1 5.5 4.3 6.4 4.3 4.7 3.8 - 1.6 - 1.5 Typ 60 6.4 3.7 0 3.0 5.5 6.2 4.9 7.0 4.9 5.2 4.0 0 2.2 0 1.8 Max Unit 80 7.0 4.1 30 3.6 7.8 - 5.5 7.6 5.5 5.7 4.2 5 2.8 20 - mA V V mV V mA V V V V V V A mA mA A mA
V6 - V9 VAGC = 2V, SW2, 3, 4 Position 1
V24, V25 VAGC = 6.7V, SW1, 4 Position 1 V23, V26 VAGC = 6.7V, SW1, 4 Position 1 V19, V20 VAGC = 6.7V, SW1, 4 Position 1 V17 I13 I13 I13 I11 I11 SW1, 2 Position 1, Adjust VCOMP for I13 = 0 SW1, 2, 4 Position 1 SW1, 2 Position 1, VCOMP = 3.5V SW1, 2 Position 1, VCOMP = 4.5V VAGC = 2V, All Switches Position 1, Measure V11, I11 = (12 - V11)/6000 VAGC = 10V, All Switches Position 1, Measure V11, I11 = (12 - V11)/6000
-0.45 -0.70 -0.90
Detector AC Set-Up Procedure: (SW1, 4 position 1, VAGC = 0V) 1. Apply DET = 10mVrms, 45.75MHz CW at the detector input. Tune L1 for maximum AC signal at Pin25, measured with a 10x FET probe or through a 1pF capacitor to prevent loading of the limiter tank. 2. Increase DET to 60mVrms. Adjust L3 until the PLL locks, as indicated by a DC voltage at the video output Pin16. 3. With the detector locked, adjust L3 for 4V at Pin18. 4. Adjust VPH for maximum detector efficiency by monitoring Pin16 for a minimum DC voltage. 5. Adjust L2 for 3.0V at Pin27 (on sensitive slope of AFC curve). AC Electrical Characteristics: (TA = +25C, Detector set-up as above, f = 45.75MHz, VAGC = 6.7V, VCOMP = 4V, and allswitches in position 0 (open) unless otherwise specified)
Parameter IF Amplifier Gain VAGC for 15dB Gain Reduction Symbol Test Conditions Min 25 4.2 Typ 35 4.6 Max Unit - 5.0 dB V OUT/IF VAGC = 2V, SW2, 3, 4 Position 1, IF = 500Vrms, Note 1 SW2, 3, 4 Position 1, IF = 2.8mVrms, Adjust VAGC for Same OUT as Gain Test SW2, 3, 4 Position 1, IF = 89mVrms, Adjust VAGC for Same OUT as Gain Test
VAGC for 45dB Gain Reduction
5.1
5.5
6.1
V
AC Electrical Characteristics (Cont'd): (TA = +25C, Detector set-up as above, f = 45.75MHz, VAGC = 6.7V, VCOMP = 4V, and allswitches in position 0 (open) unless otherwise specified)
Parameter Zero Carrier Level Detected Output Level Symbol V16 V16 Test Conditions SW1, 2, 4 Position 1, DET = 0 SW1, 2, 4 Position 1, DET = 60mVrms, Measure Change in V16 from Zero Carrier Test SW1, 2, 4 Position 1, DET = 600mVrms SW1, 2, 4 Position 1, DET = 0 SW1, 4 Position 1, DET = 60mVrms, 46.75MHz SW1, 4 Position 1, DET = 60mVrms, 44.75MHz SW1, 4 POsition 1, DET = 60mVrms, Vary Frequency and Measure the Difference between Lock Points Min 6.6 2.0 Typ 7.4 3.0 Max Unit 8.4 4.3 V V
Overload Output Voltage AFC Output Voltage (OFF) AFC Minimum Output Voltage AFC Maximum Output Voltage PLL Pull-In Range
V16 V27 V27 V27 f
- 2.8 - 9 2
2 3.0 0.5 10 3
3 3.2 1.0 - -
V V V V MHz
Note 1. The IF amplifier gain is specified with the IF output connected to a 50 measurement system which results in a 25 loaded impedance. The gain in an actual application will typically be 26dB higher.
Pin Connection Diagram IF Output VCC IF Gain Adjust IF Gain Adjust IF Supply IF Decouple IF Input IF Input IF Decouple 1 2 3 4 5 6 7 8 9 28 Detector Input 27 AFC Output 26 AFC Tank 25 Limiter Tank 24 Limiter Tank 23 AFC Tank 22 Detector Phase Adjust 21 Substrate GND 20 VCO Tank 19 VCO Tank 18 PLL Filter 17 Input to AGC Comparator 16 Video Output 15 Supply Decouple
IF GND 10 RF AGC Output 11 RF AGC Takeover Adjust 12 AGC Filter 13 AGC Gate Generator Time Constant 14
14
1
15
28
1.469 (37.32) Max
.540 (13.7) .250 (6.35)
.100 (2.54) 1.300 (33.02)
.122 (3.1) Min
.600 (15.24)

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