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TL1051FR Folha de dados(PDF) 5 Page - Texas Instruments |
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TL1051FR Folha de dados(HTML) 5 Page - Texas Instruments |
5 / 13 page TL1051 VIDEO PREPROCESSOR CIRCUIT SOCS032B – NOVEMBER 1991 4-5 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 analog output channels Terminals 27, 28, and 29 (ROUT, GOUT, and BOUT) are the individual analog output signals used in RGB color applications. Their gain can be affected by the control voltage applied to terminal 31 (AGCCONT). AGC section The AGC amplifier is a high-gain amplifier that requires an appropriate feedback network. AGCLMT input (terminal 30): A dc voltage applied to this terminal limits the amount of gain for R, G, B, and Y. AGCCONT input (terminal 31): A dc voltage applied to this terminal sets the gain (see Figure 3). It is also possible to build a feedback network and obtain AGC action. In this case, the video signal is fed back through AGCCONT. REF2V output (terminal 32): This terminal provides a 2-V reference output. AGCOUT output (terminal 33): This is the output from the AGC block. AGCDET input (terminal 34): Video from terminal 26 (YOUT) can be applied to this node to obtain feedback action. AGCSET input (terminal 35): A dc voltage applied to this terminal sets the gain for AGC action. gate section GATEIN input (terminal 38): If a gating function is desired, video from the YOUT output (terminal 26) can be applied to this terminal. GATEOUT output (terminal 39): Video is passed from GATEIN to GATEOUT if GATE (terminal 40) is low. If GATE is high, GATEOUT is in the high-impedance state. GATE input (terminal 40): A TTL signal can be applied to this input to control the active video (see the description of the GATEOUT terminal above). ALC section An amplifier similar to that in the AGC section is available for use as an integrator. If used, a capacitor should be connected from the ALC -input (terminal 42) to the ALCDRV output (terminal 43). A reset switch is available at the RESET input (terminal 44). The ALC amplifier is a high-gain amplifier requiring an appropriate feedback network. |
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