Sanyo 1 682 350 96 Service Manual

IC Block Diagram1、 TUNER IC XC5200CThe Single-Chip Multi-Standard Tuner XC5200C supports all analog TVformats transmitted worldwide in the 42-1000 MHz band on either cable orterrestrial broadcast channels. It implements on-chip tuning, and channelfiltering without external (SAW) filters and has no manually tunable parts.The broadband tuner converts the selected channel into an IntermediateFrequency (IF), which is then sampled by an internal high-resolutionanalog-to-digital converter (A/D) for further processing.The IF signals are filtered using a standard-dependent high-rejectionchannel filter and converted to a user programmable output frequency. At theoutput of the D/A converter, the TV signal is low-pass filtered using ahigh-performance smoothing filter and input to a variable gain amplifier. The IFoutput amplifier gain can be controlled via an external analog signal on Vagc.The XC5200C architecture is summarized in Figure 1. XC5200C BlockDiagram.