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STV2110A bảng dữ liệu(PDF) 4 Page - STMicroelectronics |
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STV2110A bảng dữ liệu(HTML) 4 Page - STMicroelectronics |
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4 / 15 page  Automatic Standard Identification The circuit is alternately forced in each mode during two fields (PAL mode, SECAM mode disabled or SECAM mode, PAL mode disabled). If PALsignal is identified, the alternate PAL/SECAM sequency is locked in PAL mode. To have a SECAM identification, the circuit must memorizes a first SECAM identification, than test the PAL mode and confirm a second SECAM iden- tification. The SECAM identification will take from four to six fields. Output Pin 21, named PS, is high level in PAL mode and low level in SECAM mode. Forced standard : Pin 21 can be used for the purpose : - Pin 21 to HVCC : PAL mode - Pin 21 to ground : SECAM mode VIDEO Input Stage The luminance input is controlled by the contrast control stage which range is 20dB. The luminance and color difference signals are added in the video matrix circuit to obtain the color signals. The color signals are sent to an RGB switch which will drive to the outputs either internal RGB signals or external RGB signals. Automatic Cut-off Control The black levels of the RGB outputs are controlled with the cut-off loops during three line periods after the frame retrace. The cut-off measurements are sequentially achieved during these three lines. The leakage current measurement is achieved during the frame retrace and memorized on an internal capacitor, thus the circuit is able to extract the cut-off current from the total current measurement. Warm-up Detector At the start-up, the cut-off loops are switch off, a white level is inserted on the luminance signal until a cathode current is detected. Then the cut-off loops are released. RGB Inputs To avoid the black level of the inserted signal differing from the black level of the normal video signal, the external RGB are clamped to the black level of the luminance signal. Therefore, an AC coupling is required for the RGB inputs. The RGB inputs are controlled by a 12dB range contrast control stage. ABSOLUTE MAXIMUM RATINGS Symbol Parameter Value Unit HVcc Horizontal Supply Voltage (Pin 5) 12 V Vcc Video & Chroma Supply Voltage (Pins 1-41) HVCC + 0.5 V HOUT Horizontal Output (Pin 15) 12 V Tstg Storage Temperature -55, +150 oC Toper Operating Temperature 0, +70 oC THERMAL DATA Symbol Parameter Value Unit Rth (j-a) Junction-ambient Thermal Resistance Max. 60 oC/W DC AND AC ELECTRICAL CHARACTERISTICS (HVCC =VCC =9V, Tamb =25 oC unless otherwise specified) Symbol Parameter Test Conditions Min. Typ. Max. Unit HVcc Scanning Supply Voltage (Pin 5) 8.1 9 9.9 V Vcc Video & Chroma Supply Voltage (Pins 1-41) 8.1 9 9.9 V Icch Scanning Supply Current (pin 5) No load 25 35 mA Iccv&c Video & Chroma Supply Current (Pins 1-41) No load 45 55 mA PD Total Power Dissipation No load 630 890 mW STV2110A 4/15 |
Số phần tương tự - STV2110A |
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Mô tả tương tự - STV2110A |
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