Ordering number: EN 3507
Monolithic Linear IC
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
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Excellent cross modulation characteristic: Meets the
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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 )
V
CC
variation compensation: Less variation in gain,
distortion: 8 to 12 V
Functions
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MIX
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OSC (with ALC)
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IF amplifier
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Detector
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AGC (normal)
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RF wide-band AGC
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Auto search stop signal (Signal meter output)
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Local oscillation buffer output
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IF band switching circuit (for LA1136N only)
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IF count buffer
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Stop detector output (can be set independently)
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Tweet prevention circuit
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AGC (RF, IF) time constant switching circuit
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IF AGC circuit
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Pin-diode driver
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AM stereo decoder IF output (for LA1136N only)
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Circuit preventing incorrect seek operation
AM stereo capability (LA1136N only)
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IF band switching circuit on chip; controlled by
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microcontroller for AM stereo; SUB S/N improved to
Oscillating circuit
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6 dB for AM stereo decoder
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IF output tweet characteristics: 10 dB increase, controlled by
Improved
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microcontroller modulation characteristics, especially
Improved cross
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sensitivity suppression characteristics: 15 dB improvement,
wide-band AGC operation even for SW band interference
Improved low-frequency modulation distortion
Improved temperature characteristics: S-meter, SD sensitivity
Faster RF AGC response: RF: 1/3; IF: 1/8 (compared to
predecessors)
Improved capability for driving external RF AGC transistors:
I
B
max = 200 µA
Measures to prevent incorrect seek operation
IF count buffer on chip; controlled by microcontroller
Time constant switching circuit on chip for RF and IF
AGC
IF AGC clear circuit on chip
Measures that prevent stopping one station too soon
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SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN
93097HA(II)/4281TS(US) No.3507-1/28
SANYO [ SANYO SEMICON DEVICE ]
