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