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LM1818N
Electronically Switched Audio Tape System
TL/H/7509
LM1865
Advanced
System
February 1995
LM1865 Advanced FM IF System
General Description
Reduced external component cost, improved performance,
and additonal functionsarekey featurestothe LM1865FM system.The LM1865is designedforusein electronically
tuned radio applications.It contains both deviationandsig-
nal level stop circuitryin additiontoan open-collector stop
output.The LM1865 generatesa reverse AGC voltage(ie:
decreasing AGC voltagewith increasing signal).
Features On-chip bufferto provide gain and terminate twoce-
ramic filters Low distortion 0.1% typical witha single tuned quadra-
turecoilfor 100% modulation. Broadoff frequency distortion characteristic Low THDat minimum AFT offset Meter output proportionalto signal level Stop detector with open-collector output Adjustable signal level mute/stop threshold, controlled
eitherby ultrasonic noiseinthe recovered audioorby
the meter output Adjustable deviation mute/stop threshold Separate time constantsfor signal level and deviation
mute/stop Dual threshold AGC eliminates needfor local/distance
switchand offers improved immunity from third orderin-
termodulation productsdueto tuner overload User controlof both AGC thresholds Excellent signalto noise ratio,AM rejectionand system
limiting sensitivity
Block Diagram
Order Number LM1865M LM1865N
SeeNS Package Number
M20Bor N20A
TL/H/7509–1
FIGURE1
C1995National SemiconductorCorporation RRD-B30M115/PrintedinU.S.A.
