TVP5146M2PFP

Supply voltage range:   IOV_DD to I/O GND .. . . . . . . . . . . . . . . . . . . . . . .  . . 0.5 V to 4 V
                                      DV_DD to DGND . . . . . . . . . . . . . . . . . . . . . . . . . .. . −0.2 V to 2 V
                                      A33VDD (see Note 1) to A33GND (see Note 2) .. −0.3 V to 3.6 V
                                      A18VDD (see Note 3) to A18GND (see Note 4) .. .. −0.2 V to 2 V
Digital input voltage, V_I to DGND . . . . . . . . . . . . . . . . . . . . . . . . . . .  .. . . −0.5 V to 4.5 V
Digital output voltage, V_O to DGND . . . . . . . . . . . . . . . . . .  .  . .  .  . . . . . −0.5 V to 4.5 V
Analog input voltage range AIN to AGND . . . . . . . . . . . . . . . . . . .   .  .   .. . −0.2 V to 2 V
Operating free-air temperature, T_A . . . . . . . . . . . .  . . . . . . . . . . .  .  .  . .  . . . 0to 70
Storage temperature, T_stg . . . . . . . . . . . . . . . . . . . . . . . . . . .  .    .  . .. . . −65 to 150

† Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only and functional operation of the device at these or any other conditions beyond those indicated under "recommended operating conditions" is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
NOTES: 1. CH1_A33VDD, CH2_A33VDD, CH3_A33VDD, CH4_A33VDD
             2. CH1_A33GND, CH2_A33GND, CH3_A33GND, CH4_A33GND
             3. CH1_A18VDD, CH2_A18VDD, CH3_A18VDD, CH4_A18VDD, A18VDD_REF, PLL_A18VDD
             4. CH1_A18GND, CH2_A18GND, CH3_A18GND, CH4_A18GND

The TVP5146M2 decoder uses four programmable gain amplifiers (PGAs), one per channel. The TVP5146M2  PGA can scale a signal with a voltage-input compliance of 0.5-V_PP to 2-V_PP to a full-scale 10-bit A/D output code range. A 4-bit code sets the coarse gain with individual adjustment per channel. Minimum gain corresponds to a code 0x0 (2-V_PP full-scale input, 6-dB gain) while maximum gain corresponds to code 0xF (0.5 V_PP full scale, +6-dB gain). The TVP5146M2 decoder also has 12-bit fine gain controls for each channel and applies independently to coarse gain controls. For composite video, the input video signal amplitude can vary significantly from the nominal level of 1 V_PP. The TVP5146M2 decoder can adjust its PGA setting automatically: an AGC can be enabled and can adjust the signal amplitude such that the maximum range of the ADC is reached without clipping. Some nonstandard video signals contain peak white levels that saturate the ADC. In these cases, the AGC automatically cuts back gain to avoid clipping. If the AGC is on, then the TVP5146M2 decoder can read the gain currently being used.

The TVP5146M2 AGC comprises the front-end AGC before Y/C separation and the back-end AGC after Y/C separation. The back-end AGC restores the optimum system gain whenever an amplitude reference such as the composite peak (which is only relevant before Y/C separation) forces the front-end AGC to set the gain too low. The front-end and back-end AGC algorithms can use up to four amplitude references: sync height, color burst amplitude, composite peak, and luma peak.

The specific amplitude references being used by the front-end and back-end AGC algorithms can be independently controlled using the TVP5146M2  AGC white peak processing register located at subaddress 74h. The TVP5146M2 gain increment speed and gain increment delay can be controlled using the AGC increment speed register located at subaddress 78h and the AGC increment delay register located at subaddress 79h, respectively.