NTE879 Integrated Circuit RGB to PAL/NTSC Encoder for Color TV Description: The NTE879 is an integrated circuit in a 20–Lead DIP type package used to generate a composite TV signal from baseband red, blue, green, and sync inputs. This device has color subcarrier oscillator, voltage controlled 90° phase shifter, two DSB suppressed carrier chroma modulators, RGB input matrices, and blanking level clamps. It can be operated with very few external parts, but has the pin–outs for a fully implemented, top quality composite signal. It is ideal for encoding signals from color cameras and graphic generators. Features: D Reference Oscillator Self–Contained or Externally Driven D Nominal 90° ±5° Axes are Optionally Trimmable D Simple PAL/NTSC Switch D Luminance and Chroma Channels can accept Delay Line/Bandpass Elements or Direct Connection D Provides DC Reference to Permit Direct Drive to RF Modulator Absolute Maximum Ratings: Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15V 8.2Vdc Regulator Output Current, IREG . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10mA Power Dissipation, PD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.25W Derate Above 25°C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10mW/°C Junction Temperature, TJ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +150°C Operating Temperature Range, TA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0° to +70°C Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –65° to +150°C Recommended Operating Conditions: Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 ±2V Sync Tip Level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.5 to +1.0V Sync, Blanking Level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +1.7 to +8.2V Reg, Green, Blue Inputs (Saturated) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1VP–P Electrical Characteristics: (VCC = 12V, TA = +25°C unless otherwise specifed) Parameter Pin Number/Test Conditions Min Typ Max Unit Supply Current Pin14 – 32 – mA Oscillator Amplitude Pin18 – 0.5 – VP–P External Subcarrier Input Oscillator Components Removed, Pin17 – 0.25 – VRMS Subcarrier Input Resistance Pin17 – 5.0 – kΩ – 2.0 – pF Capacitance Modulation Angle (R–Y) to (B–Y) 85 90 95 Degrees Angle Adjustment (R–Y), Pin19 – 0.25 – Deg/µA R, G, B Input 100% Color Saturation Pin3, Pin4, Pin5 0.95 1.0 1.05 VP–P R, G, B Input Resistance Pin3, Pin4, Pin5 – 10 – kΩ – 2.0 – pF Capacitance Sync Threshold Pin2 – 1.7 – V Sync Input Resistance Input > 1.7V, Pin2 – 10 – kΩ Chroma Output Level 100% Saturation. Pin13 – 1.0 – VP–P Chroma Output Resistance Pin13 – – 80 Ω Chroma Input Resistance Pin10 – 10 – kΩ – 2.0 – pF – 0.6 – VP–P Luminance – 1.4 – VP–P Chroma – 1.7 – VP–P Burst – 0.6 – VP–P Capacitance Composite Output Sync 100% Saturation, Pin9 Output Impedance Pin9, Note 1 – – 100 Ω Luminance Bandwidth 3dB, Less Delay Line, Pin9 – 8.0 – MHz Subcarrier Leakage in Output Pin9 – – 40 mVP–P Note 1. Output impedance can be reduced to less than 10Ω by using a 150Ω output load from Pin9 to GND. Power supply current will increase to about 60mA. Pin Connection Diagram Ramp Generator Input 1 20 PAL/NTSC Select Sync Input 2 19 Decoupling Red Input 3 18 X’tal OSC Green Input 4 17 X’tal OSC Blue Input 5 16 Vref 8.2V Luminance Output 6 15 GND Decoupling 7 14 VCC Luminance Input 8 13 Chroma Output Composite Output 9 12 Decoupling Chroma Input 10 11 Decoupling 20 11 .339 (8.6) 1 10 1.063 (27.0) Max .400 (10.16) .200 (5.08) Max .100 (2.54) .100 (2.54) Min