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ADV7196A датащи(PDF) 10 Page - Analog Devices |
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ADV7196A датащи(HTML) 10 Page - Analog Devices |
10 / 36 page REV. 0 ADV7196A –10– FUNCTIONAL DESCRIPTION Digital Inputs The digital inputs of the ADV7196A are TTL compatible. 30-bit YCrCb or RGB pixel data in 4:4:4 format or 20-bit YCrCb pixel data in 4:2:2 format is latched into the device on the rising edge of each clock cycle at 74.25 MHz or 74.1758 in HDTV mode. It is also possible to input 3 × 10 bit RGB data in 4:4:4 to the ADV7196A. It is recommended to input data in 4:2:2 mode to make use of the Chroma SSAFs on the ADV7196A. As can be seen in the figure below, this filter has a 0 dB pass band response and prevents signal components being folded back in to the fre- quency band. In 4:4:4: input mode, the video data is already interpolated by the external input device and the Chroma SSAFs of the ADV7196A are bypassed. RBW 10kHz VBW 300Hz SWP 17.0SEC START 100kHz STOP 20.00MHz RL –10.0dBm 10dB/ 3.18MHz ATTEN 10dB VAVG 1 MKR 0dB Figure 6. ADV7196A SSAF Response to a 2.5 MHz Chroma Sweep Using 4:2:2 Input Mode RBW 10kHz VBW 300Hz SWP 17.0SEC START 100kHz STOP 20.00MHz RL –10.0dBm 10dB/ 3.12MHz ATTEN 10dB VAVG 4 MKR –3.00dB Figure 7. Conventional Filter Response to a 2.5 MHz Chroma Sweep Using 4:4:4 Input Mode Control Signals The ADV7196A accepts sync control signals accompanied by valid 4:2:2 or 4:4:4 data. These external horizontal, vertical and blanking pulses (or EAV/SAV codes) control the insertion of appropriate sync information into the output signals. Analog Outputs The analog Y signal is output on the 11-Bit + Sync DAC A, the color component analog signals on the 11-Bit DACs B, C conforming to EIA-770.1 or EIA-770.2 standards in PS mode or EIA-770.3 in HDTV mode. RSET has a value of 2470 Ω (EIA-770.1, EIA-770.2, EIA-770.3), RLOAD has a value of 300 Ω. For RGB outputs conforming to RS-170/RS-343A output standards RSET must have a value of 2820 Ω. I 2C Filters A selectable internal I 2C filter allows significant noise reduction on the I 2C interface. In setting ALSB high, the input bandwidth on the I 2C lines is reduced and pulses of less than 50 ns are not passed to the I 2C controller. Setting ALSB low allows greater input bandwidth on the I 2C lines. Undershoot Limiter A limiter can be applied to the Y data before it is applied to the DACs. Available limit values are –1.5 IRE, –6 IRE, –11 IRE below blank- ing. This functionality is available in Progressive Scan mode only. Internal Test Pattern Generator The ADV7196A can generate a cross-hatch pattern (white lines against a black background). Additionally, the ADV7196A can output a uniform color pattern. The color of the lines or uniform field/frame can be programmed by the user. Y/CrCb Delay The Y output and the color component outputs can be delayed wrt the falling edge of the horizontal sync signal by up to four clock cycles. Gamma Correction Gamma correction may be performed on the luma data. The user has the choice to use either of two different gamma curves, A or B. At any one time one of these curves is operational if gamma correction is enabled. Gamma correction allows the mapping of the luma data to a user-defined function. 54 MHz Operation In Progressive Scan mode, it is possible to operate the three out- put DACs at 54 MHz or 27 MHz. The ADV7196A is supplied with a 27 MHz clock synced with the incoming data. If required, a second stage interpolation filter interpolates the data to 54 MHz before it is applied to the three output DACs. The second stage interpolation filter is controlled by MR36. After applying a Reset it is recommended to toggle this bit. Before toggling this bit, 3Ehex must be written to address 09hex. PROGRAMMABLE SHARPNESS FILTER Sharpness Filter Mode is applicable to the Y data only in Progres- sive Scan mode. The desired frequency response can be chosen by the user in programming the correct value via the I 2C. The variation of frequency responses can be seen in the figures on the following pages. PROGRAMMABLE ADAPTIVE FILTER CONTROL If the Adaptive Filter Mode is enabled (Progressive Scan mode only), it is possible to compensate for large edge transitions on the incoming Y data. Sensitivity and attenuation are all program- mable over the I 2C. For further information refer to Sharpness Filter Control and Adaptive Filter Control section. |
Аналогичный номер детали - ADV7196A |
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Аналогичное описание - ADV7196A |
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