LM3820N National Semiconductor, LM3820N Datasheet

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LM3820N

Manufacturer Part Number
LM3820N
Description
AM RADIO SYSTEM
Manufacturer
National Semiconductor
Datasheet

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Part Number
Manufacturer
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Part Number:
LM3820N
Manufacturer:
NS/国半
Quantity:
20 000
C 1995 National Semiconductor Corporation
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 capacitor-
tuned portable radios
The LM3820 is an improved replacement for the LM1820
Connection Diagram
Circuit Schematic
TL H 7967
See NS Package Number N14A
Order Number LM3820N
Dual-In-Line Package
Features
Y
Y
Y
Y
Y
Y
Y
Y
Input protection diodes
Good control on sensitivity
Improved S N and tweet
Versatile building-block approach
Gain-controlled RF stage
Cascode IF amplifier
Regulated supply
Pin compatible with LM1820
TL H 7967 – 1
RRD-B30M115 Printed in U S A
February 1989
TL H 7967 – 2

Related parts for LM3820N

LM3820N Summary of contents

Page 1

... 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 Y Dual-In-Line Package Order Number LM3820N See NS Package Number N14A February 1989 TL H 7967 – 7967 – 2 RRD-B30M115 Printed ...

Page 2

... 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) Supply Voltage Electrical Characteristics ( Figure 1 T Symbol Parameter I Supply Current S V Internal Zener Voltage Z Input Sensitivity Signal to Noise Ratio ...

Page 3

Applications Information The circuit shown in Figure 1 is recommended as a starting point for portable radio designs Loopstick antenna L1 is used in place of L0 and the RF amplifier is used with a resistor load to drive the ...

Page 4

Applications Information (Continued) TRANSFORMERS T1 C FIGURE 2 Slug-Tuned Auto Radio Schematic Reference Toko America 1250 Feehanville Drive Mount Prospect IL 60056 (312) 297-0070 FIGURE 3 Representative Part Numbers T2 C primary tap ratio 8 ...

Page 5

5 ...

Page 6

... National does not assume any responsibility for use of any circuitry described no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications Molded Dual-In-Line Package (N) Order Number LM3820N NS Package Number N14A 2 A critical component is any component of a life ...

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