TL1051 Datasheet, PDF (5/13 Pages) Texas Instruments – VIDEO PREPROCESSOR CIRCUIT

TL1051
VIDEO PREPROCESSOR CIRCUIT
SOCS032B – NOVEMBER 1991
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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