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MAX7482 Datasheet(PDF) 9 Page - Maxim Integrated Products |
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MAX7482 Datasheet(HTML) 9 Page - Maxim Integrated Products |
9 / 13 page Short-Circuit Protection The MAX7481/MAX7482 typical application circuit includes a 75 Ω back-termination resistor that limits short- circuit current if an external short is applied to the video output. The MAX7481/MAX7482 provide additional out- put short-circuit protection to prevent damage in appli- cations where amplifier output can be directly shorted. Charge Pump and Linear Regulator Portable video applications have space constraints that limit the use of AC-coupling capacitors and power con- straints that limit the use of batteries to generate the negative supply rail. The MAX7481/MAX7482 simplify and reduce space and power constraints by integrating a charge pump and linear regulator to create a low- noise negative supply from a single positive supply. The charge pump inverts the positive supply to create Bidirectional Video Filters/Buffers for Composite and S-Video Portable Media Devices _______________________________________________________________________________________ 9 P/R CVBSON YCON OUT3 (CVBS) OUT1 (Y) AND OUT2 (C) OUT4 (Y, CVBS) OUT5 (C) IN3 AND IN4 (Y, C) IN5 (CVBS) IN1 (Y) IN2 (C) Low Low Low Not Active Not Active GND GND Not Used Not Used Active Active Low Low High Not Active Active GND GND Not Used Not Used Active Active Low High Low Active Not Active GND GND Not Used Not Used Active Active Low High High Active Active GND GND Not Used Not Used Active Active High Low Low GND GND GND GND Not Used Not Used Not Used Not Used High Low High GND GND Active Active Active Not Used Not Used Not Used High High Low GND GND Active GND Not Used Active Not Used Not Used High High High GND GND GND GND Not Used Not Used Not Used Not Used Table 1. Input/Output Truth Table CVBSON YCON P/R = LOW LPF LPF VIDEO ADC VIDEO DAC VIDEO ADC CONTROL LOGIC VIDEO DAC MAX7481 MAX7482 S4 S5 S1 S2 S3 75 Ω 0.1 μF 75 Ω 75 Ω 0.1 μF 0.1 μF OUT2 OUT3 S8 S7 OUT1 IN3 IN5 IN4 IN2 IN1 S6 OUT5 OUT4 Figure 4. Signal Flow Diagram for Playback Mode |
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