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LA1130 AM Tuner for Car Radio


Overview
 The LA1130 is an IC developed for AM tuner systems in car radio applications. It provides low-level local oscillation so that it can be applied in varactor diode tuning applications as well as ยต tuning applications.

Functions
  RF amplification
 MIX
 OSC (with ALC)
 IF amplification
 Detection
 AGC (normal)
 RF wide-band AGC
 Others


Features
  Good space factor due to single-end package.
 Easy to design printed circuit pattern due to 3mm-pitch pin interval.
 Double-balanced type MIX : Improvement in IF interference, spurious interference.
 Normal AGC : Less variation in detector output to input.
 RF wide-band AGC : Improvement in cross modulation distortion, especially strong input characteristics in varactor diode tuning applications because of low operating level (300mVrms).
 AGC drive output for FET : Possible to apply AGC to FET at input stage in varactor diode tuning applications.
 ALC at OSC stage : Improvement in tracking error due to stabilized low-level (350mVrms) oscillation output in varactor diode tuning applications.
 Reference voltage output : Possible to use 5.6V reference voltage for other bias (FET, etc.).
V CC variation compensation : Less variation in gain, distortion, etc. (7.5 to 16V)
 Less ripple voltage : Less modulation of carrier by supply voltage ripple.
 Low pop noise : Possible to reduce pop noise at the time of V CC -on, mode-on by selecting AGC time constant.





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