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| GL3820 GL3820 Description This integrated circuit provides all video switching allowing connections between the peri TV plug and video sections in the TV set. Pin configuration GND 1 75 2 VIDEO OUTPUT INTERNAL VIDEO INPUT 3 8 EXTERNAL 7 VCC Features * 1 Video Output 75U- 1 VPP No Switched * 1 Switched Video Output 2 VPP * Video Cross Talk : 50 dB Typical * Short Circuit Protection of Inputs and Outputs * Clamped Video Inputs Maximum Ratings RATING Supply Voltage Operating Temperature with Load > 150 with Load = 75 Junction Temperature Storage Temperature Minimum DC Load Resistor P6 Minimum DC Load Resistor P2 SYMBOL Vcc Topr GL6850 6 5 SWITCHED VIDEO OUTPUT SWITCHING INPUT NC 4 VALUE 18 -10 to + 100 -10 to + 70 -40 to + 150 -40 to + 150 600 75 UNIT V E Tj Tstg E E Typical Application and Test Circuit VCC Switching Input . 0 or no connected = Video TV . > 7V = external video 5 G=2 10k 7 External Video Input 1 VPP 8 Video Coming from TV 2 VPP Ref. (low impedance) 3 2mA G=1 6 Video 2 VPP 600 2 Video 1 VPP 75 75 1 Note : We advice to protect the 75 output through a 75 resistor for supply voltage upper than 9 V. 1 GL3820 Electrical Characteristics : Ta = + 25 EVCC = 9V (unless otherwise noted) , CHARACTERISTIC Supply Voltage Range Supply Current (no load on pin 2 and pin 6) Supply Current (with 75 between pin 2-1, with 600 between pin 6-1) Total Power Dissipation with Load Internal Video Input Swing from PIF (positive video) Internal Video Input Impedance (positive video) External Video input Swing (positive video) External Video Input Impedance (positive video) Switched Video Output Swing Switched Video Output Dynamic Impedance Switched Video DC Output Voltage (sync. Pulse level, note) (600) Switched Video Band Width (- 1 dB) Switched Video Output Gain Pin 6 - Pin 8 (gain with 600 load) Pin 6 - Pin 3 (gain with 600 load) External Video Output swing( with 150 load) External Video Dynamic Output Impedance External Video DC Output Voltage (sync. Pulse level, note) (150) External Video Output Gain (pin 2 - pin3 gain with 150 load) Switching Input Unactive Low Level or Unconnected Pin (TV receiving) Switching Input Active Level (ext. receiving) Switching Input Impedance Video Rejection between Two Inputs 0 to 5 MHz 1kHz Differential Group Delay Linearity Distortion Luma Chroma Intermodulation Luma - Chroma Supply Voltage Rejection (1 kHz) SYMBO L VCC ICC ICC Ptot MIN 8 50 50 105 6 +5 -1 1.5 -1.8 0 7 10 -50 40 TYP 40 450 10 1.8 +6 -0.5 2 10 1.8 -1 -50 15 2 2 5 50 2.2 +7 0 2.2 2.2 -0.4 3 VCC dB MAX UNIT 14 20 4.5 2 4.5 V mA mA mW VPP k VPP k VPP V MHz DB V V dB V V kU dB ns % Note : Use a video signal with a synchro pulse in order to make the clamp work in a correct way (75 to the ground and 10i F in series). 2 |
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