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LA7138M 데이터시트(PDF) 9 Page - Sanyo Semicon Device |
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LA7138M 데이터시트(HTML) 9 Page - Sanyo Semicon Device |
9 / 13 page LA7138M No.A0220-9/16 Continued from preceding page. Pin No. Pin name I/O Pin voltage Input/ Output impedance Function Equivalent circuit 6 C.IN I 4.8V 10k Ω Video signal input pin. Enter the chroma signal for input of composite/S signal. Enter the B-Y or R-Y signal for input of the component signal input. For input of the base band signal, enter any of RGB signals that have a sync signal. 8 REG O 8V 1.5k Ω Pin for the regulator that generates an 8V supply voltage in IC. To use the supply voltage of 12V, connect a collector of the external PNP transistor (see the test circuit A). Since the noise in IC is dependent on the stability of regulator, it is recommended to connect a 470 µF capacitor when the S/N ratio of –80dB is to be secured for controls other than Y/C-MIX. To secure the S/N ratio of –74dB for Y/C-MIX, set the supply voltage to 8V (VCCB) and apply 8V also to this pin. (See the test circuit B.) 10 Y.IN I 4.2V Clamp form Video signal input pin. Enter the Y signal for input of composite/S and component signal. For input of the base band signal, enter any of RGB signals that have a sync signal. 11 AMP.SW I 2.4V 9.0G Ω Control pin to select the AMP gain according to the input signal amplitude. Control is possible with a microcontroller that operates on 3.3 to 5.0V power supply as well as through selection of VCC/GND on a substrate. 12 PNP-B-IN O 3.4V 4.0G Ω Base input pin of the external PNP transistor for the 8V regulator. Connect to the transistor in case of the supply voltage of 12V (see the test circuit A). To use the supply voltage of 8V, keep this pin open (see the test circuit B). Continued on next page. |
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