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MAX9588AUA+T Datasheet(PDF) 9 Page - Maxim Integrated Products |
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MAX9588AUA+T Datasheet(HTML) 9 Page - Maxim Integrated Products |
9 / 18 page Single, Dual, Triple, and Quad Standard-Definition Video Filter Amplifiers with AC-Coupled Input Buffers _______________________________________________________________________________________ 9 Detailed Description The MAX9586–MAX9589 filter and amplify the video DAC output in applications such as set-top boxes and televisions. These devices consist of input clamps, input bias circuits, lowpass filters, and gain of 2V/V out- put amplifiers capable of driving a standard 150Ω video load to ground. Inputs The input stages of the MAX9586–MAX9589 are either sync-tip clamps or bias circuits. Sync-tip clamps accept AC-coupled CVBS or luma video signals with sync puls- es. The sync-tip voltage is internally set to 300mV. Bias circuit inputs accept AC-coupled chroma, a subcarrier modulated with the color information. The bias voltage of the bias circuits is approximately 500mV. Video Filter The filter passband (±1dB) is typically 7MHz, which makes the device suitable for standard-definition video signals from all sources (e.g., broadcast and DVD). Broadcast video signals are channel limited: NTSC sig- nals have 4.2MHz bandwidth and PAL signals have 5MHz bandwidth. Video signals from a DVD player, however, are not channel 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, clock- ing the video current DAC at 27MHz. Outputs The video output amplifiers can both source and sink load current, allowing output loads to be DC- or AC- coupled. The amplifier output stage needs approxi- mately 300mV of headroom from either supply rail. The devices have an internal level-shift circuit that positions the sync tip at approximately 300mV at the output. If the supply voltage is greater than 3.135V (5% below a 3.3V supply), each amplifier can drive two DC-cou- pled video loads to ground. If the supply is less than 3.135V, each amplifier can drive only one DC-coupled or AC-coupled video load. Shutdown (MAX9586) The MAX9586 draws less than 1µA supply current when SHDN is low. In shutdown mode, the amplifier output becomes high impedance. Applications Information AC-Coupling the Outputs The outputs can be AC-coupled since the output stage can source and sink current as shown in Figure 1. Coupling capacitors should be 220µF or greater to keep the highpass filter, formed by the 150Ω equivalent resistance of the video transmission line, to a corner frequency of 4.8Hz or below. The frame rate of PAL systems is 25Hz, and the frame rate of NTSC systems is 30Hz. The corner frequency should be well below the frame rate. Power-Supply Bypassing and Ground The MAX9586–MAX9589 operate from a single-supply voltage down to 2.7V, allowing for low-power operation. Bypass VDD to GND with a 0.1µF capacitor. Place all external components as close as possible to the device. |
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