TLG1100 Datasheet | Telegent Systems

Ultra-Low Power NTSC/PAL TV-On-Chip MIKIMOBILE ONLY Description The TLG1100 is a high performance, ultra-low power RF tuner bined with an NTSC/PAL patible video decoder on a single chip. The TLG1100 is a true single-chip design, requiring no external SAW or ceramic filters to achieve full channel selectivity with an average power consumption is only 250 m W. Capable of receiving any channel from 50 to 800 MHz, designs employing the TLG1100 can be deployed for analog television reception nearly worldwide with only minimal software changes. The TLG1100 utilizes a direct-conversion, zero IF architecture that allows for extremely good image and adjacent channel signal rejection. A wideband, low-noise amplifier is used to receive the entire video signal band from the antenna, and provides a gain range in excess of 60 d B. A single down conversion I/Q mixer then translates the desired channel to DC. At baseband, an anti-aliasing filter is bined with a second 60 d B variable-gain amplifier to provide the first level of adjacent-channel rejection, as well as provide signal conditioning for interfacing into the dual 10-bit analog-todigital converters. Subsequent processing by the DSP provides final adjacent-channel rejection and audio/video carrier demodulation. The audio stream is FM-demodulated and passed to the audio output port, whereas the CVBS video stream is separated into ponent video and output onto the video data bus. Telegent Systems’ Sure Trak™ DSP-based tuner architecture enables several unique Features in the decoder that make it ideal for the mobile reception environment. Unlike conventional analog decoders, the TLG1100 can pensate for multi-path fading thereby preventing severe ghosting and picture degradation when the receiving antenna is small and in-motion. In addition, if momentary signal dropout is detected, the TLG1100 can be programmed to hold the prior frame, preventing severe breakup in the perceived image. For high-speed motion...