●Overview
●The LA1136N/NM and LA1137N/NM are high-performance AM electronic tuner ICs offering sophisticated functions. They are especially suited for use in car radio and home stereo
●(antenna: loop) applications.
●Features
●.Excellent cross modulation characteristic: 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 100 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 (350 mVrms: LA1137N) for varactor diode.
●.MIX: Double-balanced differential MIX meeting the requirements for preventing spurious interference, IF interference.
●.Good characteristic at high input: 130 dBµ input fm = 400 Hz 80%mod THD = 0.5% typ.
●.High S/N: Good S/N at medium input (55 dB typ).
●.Usable sensitivity: (S/N = 20 dB input): 25 dBµ(when using 2SK715 )
●.VCC variation compensation: Less variation in gain, distortion: 8 to 12 V
●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
●.IF band switching circuit (for LA1136N only)
●.IF count buffer
●.Stop detector output (can be set independently)
●.Tweet prevention circuit
●.AGC (RF, IF) time constant switching circuit
●.IF AGC circuit
●.Pin-diode driver
●.AM stereo decoder IF output (for LA1136N only)
●.Circuit preventing incorrect seek operation
