NTE715 Integrated Circuit TV Chroma IF Amp Description: The NTE715 is a combined two–stage chroma amplifier and functional control circuit. The input signal is received from the video amplifier and applied to Pin2 of the input amplifier stage. The first amplifier stage is part of the ACC system and is controlled by differential adjustment from the ACC input Pin1 and Pin14. The output of the 1st amplifier is directed to Pin6 from where the signal may be applied to the ACC detection system of the NTE714 or an equivalent circuit. The output at Pin6 is also applied to Pin7 which is the input to the 2nd amplifier stage. Another output of the 1st amplifier at Pin13 is directed to the killer adjustment circuit. The DC voltage level at Pin13 rises as the ACC differential voltage decreases with a reduction in the burst amplitude. At a pre–set conditions determined by the killer adjustment resistor the killercircuit is activated and causes the 2nd chroma amplifier stage to be cut off. The 2nd chroma amplifier stage is also gain controlled by the adjustment of DC voltage at Pin10. The output of the 2nd chroma amplifier stage is available at Pin9. Both amplifier outputs utilize emitter–followers with short–circuit protection. Absolute Maximum Ratings: (TA = +25°C unless otherwise specified) DC Supply Voltage (Pin8 to Pin4) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30V Device Dissipation (Up to TA = +70°C), PD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 530mW Derate Above 70°C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.7mW/°C Operating Ambient Temperature Range, Topr . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –40° to +85°C Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –65° to +150°C Lead Temperature (During Soldering, 1/32” (3.17mm) from seating plane, 10s max), TL . . +265°C Electrical Characteristics: (TA = +25°C unless otherwise specified) Parameter Symbol Test Conditions Min Typ Max Unit Static Characteristics Voltages Bias Reference Terminal V12 S1 Open, S2 Open – 17.3 – V Amplifier No. 1 Chroma Input V2 S1 Open, S2 Open – 1.75 – V Amplifier No. 1 Chroma Output Balanced V6 S1 Open, S2 Open – 20 – V S1 Open, S2 Closed – 13.5 – V Unbalanced Amplifier No 2 Chroma Input V7 S1 Open, S2 Open – 1.5 – V Amplifier No 2 Chroma Output V9 S1 Closed, S2 Open – 20.6 – V Supply Current IT S1 Open, S2 Open 17 24.5 31 mA Electrical Characteristics: (TA = +25°C unless otherwise specified) Parameter Symbol Test Conditions Min Typ Max Unit Dynamic Characteristics Amplifier No. 1 Voltage Gain AV1 Eg = 30mVRMS Measure V6 14 – – dB Amplifier No. 2 Voltage Gain AV2 Vg = 1.0V(RMS) Measure V7 – 14 – dB Maximum Chroma Output Voltage V9 – 2 – VRMS 2.1 3.8 6.8 V 10% Chroma Gain Control Reference Voltage V8–V10 Eg = 50mVrms, adjust Chroma Gain Control to Change Vg to 10% of Maximum Chroma Output Output Voltage, Killer Off V9 S1 in Position 2, Eg = 50mVRMS, adjust “Killer Adjust” for an abrupt decrease in V9 – – 12 mVRMS Output Voltage, Chroma V9 Eg = 50mVRMS, adjust Chroma control to min. Chroma Output – – 12 mVRMS Bandwidth Amplifier No. 1 BW – 12 – MHz – 30 – MHz Amplifier No. 2 Amplifier No. 1 Input Impedance rI 1 – 2 – kΩ Amplifier No. 1 Input Capacitance ci 1 – 4 – pF Amplifier No. 1 Output Impedance ro 1 – 85 – Ω Ampl. No. 2 Input Impedance ri 2 – 2.1 – kΩ Ampl. No. 2 Output Impedance ro 2 – 85 – Ω Pin Connection Diagram ACC Input 1 Chroma 1 Input 2 14 ACC Input 12 Decouple GND 4 11 Decouple N.C. 5 10 Chroma Level Control Chroma 2 Input 7 8 1 7 13 Killer Adjust Gain Preselect 3 Chroma 1 Output 6 14 .785 (19.95) Max .300 (7.62) .200 (5.08) Max 9 Chroma 2 Output 8 VCC .100 (2.45) .600 (15.24) .099 (2.5) Min