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THC7984 Datasheet(PDF) 6 Page - THine Electronics, Inc. |
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THC7984 Datasheet(HTML) 6 Page - THine Electronics, Inc. |
6 / 46 page THC7984_Rev.2.0_E 5 / 45 THine Electronics, Inc. Copyright©2013 THine Electronics, Inc. Functional Description Digital Input - All digital inputs are 5V tolerant during power-on. Analog Input - The THC7984 has two ports that each include three analog inputs for RGB or YPbPr. The input port can be selected by register. - In case input signals are YPbPr, Y may be input into GAIN0 (or GAIN1) and SOGIN0 (or SOGIN1) , Pr into RAIN0 (or RAIN1) , and Pb into BAIN0 (or BAIN1) . - The THC7984 accommodates analog signals ranging from 0.5 Vpp to 1.0 Vpp. Video Filter (LPF) The THC7984 has 2 kinds of low-pass filters. - 5th-order LPF for YPbPr, whose bandwidth is adjustable from 6 MHz to 92 MHz in 24 steps. - 2nd-order LPF for RGB, whose bandwidth is adjustable in 4 steps (40 MHz, 90 MHz, 170 MHz, and 310 MHz) . Serial Interface - The THC7984 is controlled by 2-wire serial interface. - Serial clock SCL supports up to 100 kHz. Sync Input - The THC7984 has two ports that each include two digital inputs for the separate sync (HSYNC and VSYNC) . The input port can be selected by register. - The THC7984 can process composite sync (CSYNC) . CSYNC may be input into HSYNC0 or HSYNC1. Digital Output - The digital outputs can operate from 2.5 V to 3.3 V (VDD) . - The output drive strength is programmable by 2-bit registers (except SDA) . Clamp - Pedestal clamp for RGB and Y (luminance) clamps black level to 0 with automatic offset cancel. - Midscale clamp for PbPr clamps to 512 with automatic offset cancel. - 256-level clamp for Y (luminance) clamps to 256 with automatic offset cancel. It can be used for A/D conversion of Y including sync signal. In this case, input signal needs to be attenuated to put it within the input rang of A/D converter. - Clamp pulses can be input from CLAMP pin when external clamp is selected. Gain, Offset - Gain is programmable by 11-bit registers (2048 steps) . - Offset from -256 to +255 can be added to the output code. - Gain and offset can be adjusted independently. Reference Voltage - The THC7984 has Band Gap Reference inside and doesn’t require external voltage reference. - The internal reference voltages (REFHI, REFCM, and REFLO) must be bypassed to stabilize. Each pin (REFHI, REFCM, and REFLO) is connected to ground through a 10 μF capacitor. |
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