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LM3820

National Semiconductor
Part Number LM3820
Manufacturer National Semiconductor
Description AM RADIO SYSTEM
Published Oct 25, 2005
Detailed Description LM3820 AM Radio System February 1989 LM3820 AM Radio System General Description The LM3820 is a 3-stage AM radio IC c...
Datasheet PDF File LM3820 PDF File

LM3820
LM3820

Overview
LM3820 AM Radio System February 1989 LM3820 AM Radio System General Description The LM3820 is a 3-stage AM radio IC consisting of an RF amplifier oscillator mixer IF amplifier AGC detector and zener regulator The device was originally designed for use in slug-tuned auto radio applications but is also suitable for capacitortuned portable radios The LM3820 is an improved replacement for the LM1820 Features Y Input protection diodes Y Good control on sensitivity Y Improved S N and tweet Y Versatile building-block approach Y Gain-controlled RF stage Y Cascode IF amplifier Y Regulated supply Y Pin compatible with LM1820 Connection Diagram Dual-In-Line Package Circuit Schematic Order Number LM3820N See NS Package Number N14A TL H 7967 – 1 C1995 National Semiconductor Corporation TL H 7967 TL H 7967 – 2 RRD-B30M115 Printed in U S A Absolute Maximum Ratings If Military Aerospace specified devices are required please contact the National Semiconductor Sales Office Distributors for availability and specifications Power Dissipation (Note 1) 1200 mW Supply Voltage 16V Current into Supply Terminal (Pin 3) Operating Temperature Range Storage Temperature Range Lead Temperature (Soldering 10 sec ) 35 mA b25 C to a85 C b65 C to a150 C 260 C Electrical Characteristics (Figure 1 TA e 25 C VS e 6V unless noted) Symbol Parameter Conditions Min Typ Max Units IS Supply Current No RF Input 12 18 24 mA VZ Internal Zener Voltage 70 75 80 V Input Sensitivity f e 1 MHz 30% Mod 400 Hz Measure RF Input Level for 10 mV Audio Output with 15 35 70 mV Tuning Peaked Signal to Noise Ratio f e 1 MHz 30% Mod 1 kHz (S a N) N at Audio Output 22 28 dB with 100 mV RF Input Overload Distortion f e 1 MHz 90% Mod 1 kHz THD at Audio Output with 30 mV RF Input 6 10 % Note 1 Above TA e 25 C derate based on TJ(Max) e 150 C and iJA e 100 C W Typical Applications 100 mV RF INPUT is equivalent to approx 1 mV meter field strength See Applications Informati...


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