TLG1100资料

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TLG1100资料

Description
The TLG1100 is a high performance, ultra-low
power RF tuner combined with an NTSC/PAL
compatible 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 200 mW. Capable of
receiving any channel from 50 to 850 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 40 dB. A
single down conversion I/Q mixer then translates
the desired channel to DC.
At baseband, an anti-aliasing filter is combined
with a second 60 dB 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 component video and
output onto the video data bus.
Telegent Systems’ digiTune 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 compensate
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
applications, the digiTune architecture provides

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