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ISL59960 Folha de dados(PDF) 11 Page - Intersil Corporation |
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ISL59960 Folha de dados(HTML) 11 Page - Intersil Corporation |
11 / 17 page ISL59960 11 FN8358.0 December 18, 2012 go low until/unless the device is reset by toggling the INVERT pin. A reset should only be necessary if the length or type of cable was changed without cycling power. To enable the Lock Until Reset mode, tie the LOCKED output pin to the FREEZE input pin as shown in Figure 9 on page 9. To generate a reset (and trigger a re-equalization), toggle the external INVERT pin. Depending on the initial state of INVERT, this would be a high-low-high or low-high-low sequence. CONTINUOUS UPDATE In the Continuous Update mode, 960MegaQ™ will continuously try to find the optimum equalization solution. When the equalization has settled for 100 sequential video lines with no changes, the LOCKED pin will go high. However, once lock is achieved, noise and average-picture-level changes may cause the device to unlock, causing some image perturbation while 960MegaQ™ re-equalizes. The Continuous Update mode is enabled whenever the FREEZE pin is set to a logic low (grounded). Polarity Detection and Correction 960MegaQ™ features polarity detection and correction, automatically detecting incorrectly-wired input signals and inverting the signal inside the IC as necessary. The detected polarity is indicated by the state of the INVERT pin. The INVERT pin has 2 modes of operation. It is typically used to indicate whether or not the incoming signal is inverted (the “+” signal on the “-” input and vice-versa). The state of the invert signal is then used to tell the signal processing logic whether or not to invert the signal in the signal path. A logic high on INVERT indicates that the positive differential input signal is on IN- (pin 5) and the negative differential input signal is on IN+ (pin 3). A logic low indicates nominal polarity. However, the unique design of the INVERT I/O pin (Figure 12) also allows 960MegaQ™’s internal inversion detector to be overdriven externally, forcing 960MegaQ™ to invert or not invert the signal regardless of the state of the inversion detection function. This is not necessary in normal operation, but it may improve performance in particularly noisy environments when the polarity of the signal is guaranteed to be correct. The COLOR Pin The color pin has 2 modes of operation. It is typically used to indicate whether or not the incoming signal has a colorburst or not. The state of the color signal is then used to tell the signal processing logic whether or not it can rely on the presence of a colorburst signal. A logic high indicates a color signal; a logic low indicates monochrome. However, the unique design of the COLOR I/O pin (Figure 13) also allows 960MegaQ™’s internal color detector to be overdriven externally. This is not necessary in normal operation, but it may improve performance in particularly noisy environments when the signal type is predetermined. Monochrome Video Signals 960MegaQ™ will equalize monochrome signals to the same distance as color signals. However, due to the high level of noise past ~3500 feet, the COLOR and LOCKED indicators may become invalid for monochrome signals. The device will still equalize properly if this occurs. Security Cameras 960MegaQ™ is ideal for security camera installations. The automatic adaptive equalizer doesn't need any active silicon on the transmit side of the cable, enabling upgrading of older installations without having to touch the installed camera base, including older monochrome cameras. 960MegaQ™ automatically adjusts for wiring polarity errors as well as for optimum image quality. These features eliminate the need for the installer to make any adjustments. With an extended equalization range of 4000ft, the ISL59960 enables cameras to be placed in even more remote locations, enabling coverage of up to three square miles from a single monitoring station. Additional Equalization Modes Available With the Serial Interface In addition to the Lock Until Reset and Continuous Update modes, software control of 960MegaQ™ through the SPI interface adds a Lock Until Signal Loss mode and a Manual Equalization mode. Note: When controlling 960MegaQ™ through the SPI interface, the external FREEZE pin must be tied to ground (logic low). Failure to keep FREEZE at a logic low will prevent the software controls from working properly. INVERSION DETECTION LOGIC 13k Ω ISL59960 SIGNAL PROCESSING INVERT PIN FIGURE 12. INVERT PIN STRUCTURE COLOR DETECTION LOGIC 13k Ω ISL59960 SIGNAL PROCESSING COLOR PIN FIGURE 13. COLOR PIN STRUCTURE |
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