LM1868N National Semiconductor, LM1868N Datasheet

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LM1868N

Manufacturer Part Number
LM1868N
Description
AM/FM RADIO SYSTEM
Manufacturer
National Semiconductor
Datasheet

Specifications of LM1868N

Function
AM, FM, Tuner
Package / Case
20-DIP (0.300", 7.62mm)
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Other names
*LM1868N
LM1868

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
LM1868N
Manufacturer:
NS/国半
Quantity:
20 000
C 1995 National Semiconductor Corporation
LM1868 AM FM Radio System
General Description
The combination of the LM1868 and an FM tuner will pro-
vide all the necessary functions for a 0 5 watt AM FM radio
Included in the LM 1868 are the audio power amplifier FM
IF and detector and the AM converter IF and detector
The device is suitable for both line operated and 9V battery
applications
Block Diagram
Note See table for coil data
TL H 7909
See NS Package Number N20A
Order Number LM1868N
Features
Y
Y
Y
Y
Y
reducing amplifier noise in the AM band
characteristics
DC selection of AM FM mode
Regulated supply
Audio amplifier bandwidth decreased in AM mode
AM converter AGC for excellent overload
Low current internal AM detector for low tweet radiation
RRD-B30M115 Printed in U S A
February 1995
TL H 7909 – 1

Related parts for LM1868N

LM1868N Summary of contents

Page 1

... Regulated supply Y Audio amplifier bandwidth decreased in AM mode Y reducing amplifier noise in the AM band AM converter AGC for excellent overload Y characteristics Low current internal AM detector for low tweet radiation Y Order Number LM1868N See NS Package Number N20A February 1995 TL H 7909 – 1 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 Supply Voltage (Pin 19) Package Dissipation Above Derate Based 150 C and J(MAX) JA Electrical Characteristics Parameter STATIC CHARACTERISTICS Supply Current Regulator Output Voltage (Pin 16) ...

Page 3

Typical Performance Characteristics All curves are measured at audio output (Test Circuit) AM Characteristics Power Dissipation vs Power Output Test Circuit Note See table for coil data (Continued) Gain vs Frequency Audio Recovered Audio vs Supply ...

Page 4

Typical Application 4 ...

Page 5

PC Board Layout Typical Performance Characteristics All curves are measured at audio output Component Side Typical Application TL H 7909 – 7909– 7909– 8 ...

Page 6

IC External Components (Application Circuit) Typical Component Comments Value C1 100 pF Removes tuner LO from IF input Antenna coupling capacitor decoupling capacitors 005 F AM ...

Page 7

Layout Considerations AM SECTION Most problems radio design are associated with radiation of undesired signals to the loopstick Depending on the source this radiation can cause a variety of problems including tweet poor signal-to-noise and low frequency ...

Page 8

Equivalent Schematic 8 ...

Page 9

9 ...

Page 10

... 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 LM1868N NS Package Number N20A 2 A critical component is any component of a life ...

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