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MAX9680AXT Datasheet(PDF) 6 Page - Maxim Integrated Products |
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MAX9680AXT Datasheet(HTML) 6 Page - Maxim Integrated Products |
6 / 9 page 3V Video Amplifier with Internal Gain and Filter in SC70 6 ______________________________________________________________________________________ Pin Description Detailed Description The MAX9680 filters and amplifies the video DAC output in applications such as mobile phones. The MAX9680 consists of two resistors, an input buffer, lowpass filter, and output amplifier capable of driving a standard 150I video load to ground. The output amplifier provides a fixed gain of 5.17V/V. RSET Resistor The video current DAC imposes a reference voltage, VREF, across RSET. The resulting current (VREF/RSET) is the reference current for the video current DAC. Input The video input should be directly connected to the out- put of the video current DAC. RIN, the equivalent input resistance, is 872I to ground. The output current of the video DAC flows through RIN to create the video signal in the voltage domain. Video Filter The filter bandwidth (-3dB) is typically 9MHz, making the device suitable for standard-definition video signals from all sources (e.g., broadcast and DVD). Broadcast video signals are channel limited: NTSC signals have 4.2MHz bandwidth, and PAL signals have 5MHz bandwidth. Video signals from a DVD player, however, are not chan- nel limited; so the bandwidth of DVD video signals can approach the Nyquist limit of 6.75MHz. Recommendation: ITU-R BT.601-5 specifies 13.5MHz as the sampling rate for standard-definition video. Therefore, the maximum bandwidth of the signal is 6.75MHz. To ease the filtering requirements, most modern video systems oversample by two times, clocking the video current DAC at 27MHz. Output The MAX9680 features 5.17V/V gain. Operating from a 2.7V to 3.6V supply, the output amplifier is able to drive a 2.3V signal into a 150I video load to ground. The out- put is typically offset 120mV above ground to guarantee linear operation of the amplifier. The MAX9680 output only sources current; all loads should be connected to ground. Short-Circuit Protection The MAX9680 Typical Application Circuit includes a 75I back-termination resistor that limits short-circuit currents for an external short applied at the video output. The MAX9680 features internal output short-circuit protection to prevent device damage in prototyping and applica- tions where the amplifier output can be directly shorted. Short-circuit protection activates if the output is short circuited and the output current exceeds 90mA. During short-circuit protection, the output of the MAX9680 is shut off for 18Fs and then turns on for 0.6Fs. If the short is still present, the MAX9680 output shuts off again. Extended short circuits result in a pulsed output. The device resumes normal operation after the short is removed. PIN NAME DESCRIPTION 1 IN Input 2 GND Ground 3 RSET Resistor Set. The reference voltage of the current digital-to-analog converter (DAC) is applied across the internal RSET resistor to generate the reference current of the DAC. 4 OUT Output 5 ENABLE Enable. Drive high to enable the device. Pull low to disable the device. 6 VDD Positive Power Supply. Bypass to GND with a 0.1FF capacitor. |
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