Overview

　　The LA1135 is a high-performance AM electronic tuner IC that is greatly improved in cross modulation characteristics. It is especially suited for use in car radio and home stereo (antenna: loop) applications.

　　Features

　　• Excellent cross modulation characteristics: Meets the requirements for preventing not only adjacent-channel interference but also interference caused by all channels within broadcast band.

　　• Narrow-band signal meter output: Usable as auto search stop signal. Has linearity up to 80 dBµ.

　　• Local oscillation buffer output: Facilitates designing of electronic tuner system, frequency display, etc.

　　• OSC (with ALC): Improves tracking error because oscillation output is stabilized at a low level (380 mVrms) for varactor diode.

　　• MIX: Double-balanced differential MIX meeting the requirements for preventing spurious interference, IF interference.

　　• Good characteristics at high input: 130 dBµ input fm= 400 Hz 80% mod THD = 0.4% typ

　　• Low noise: Good S/N at medium input (56 dB typ)

　　• Usable sensitivity: (S/N = 20 dB input): 25 dBµ (2SK315 IDSS = 11mA)

　　• VCC variation compensation: Less variation in gain, distortion: 8 to 12 V

　　• Reduced pop noise: Capable of reducing pop noise at the time of VCC ON, mode select by adjusting AGC time constant.

　　Functions

　　• MIX

　　• OSC (with ALC)

　　• IF amplifier

　　• Detector

　　• AGC (normal)

　　• RF wide-band AGC

　　• Auto search stop signal (signal meter output)

　　• Local oscillation buffer output

　　• Others