LM1823N National Semiconductor, LM1823N Datasheet

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LM1823N

Manufacturer Part Number
LM1823N
Description
IC VIDEO IF AMP/DETECTOR 28DIP
Manufacturer
National Semiconductor
Type
IF Amplifier, PLL Detectorr
Datasheet

Specifications of LM1823N

Applications
IF
Mounting Type
Through Hole
Package / Case
*
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Other names
*LM1823N
C 1995 National Semiconductor Corporation
LM1823 Video IF Amplifier PLL Detector System
General Description
The LM1823 is a complete video IF signal processing sys-
tem on a chip It contains a 5-stage gain-controlled IF ampli-
fier a PLL synchronous amplitude detector self-contained
gated AGC and a switchable AFC detector The increased
flexibility of the LM1823 makes it suitable for a wide variety
of television applications where high quality video or sound
carrier recovery is required These include home receiver
video IFs cable and subscription TV decoders and parallel
sound IF intercarrier detector systems Typical operating
frequencies are 38 9 MHz 45 75 MHz 58 75 MHz and
61 25 MHz
Test Circuit
Order Number LM1823N
See NS Package N28B
Measure parameters at indicated test points
TL H 5222
T1 - 50
L1 - 9 T
L2 - 4 T
L3 - 6 T
All caps in F unless noted
Mini-Circuits Lab TM01-1T
unbal to bal
on
22 wire
HF core shielded
Features
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
form with
Low differential gain and phase
IF and detector pin compatible with LM1822
Common-base IF inputs for SAW filters
True synchronous video detector using PLL
Excellent stability at high system gains
Noise-averaged gated AGC system
Uncommitted AGC comparator input
Internal AGC gate generator
Superior small-signal detector linearity
AFC detector with adjustable output bias
9 MHz video bandwidth
Reverse tuner AGC output
RRD-B30M115 Printed in U S A
February 1995
TL H 5222 – 1

Related parts for LM1823N

LM1823N Summary of contents

Page 1

... IF intercarrier detector systems Typical operating frequencies are 38 9 MHz 45 75 MHz 58 75 MHz and 61 25 MHz Test Circuit Measure parameters at indicated test points Order Number LM1823N See NS Package N28B C 1995 National Semiconductor Corporation TL H 5222 Features Low differential gain and phase ...

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 Supply Voltage V2 IF Supply Current I 5 AGC Gate Voltage V14 Video Output Current I 16 PLL Filter Current Electrical Characteristics ...

Page 3

Detector AC Set-Up Procedure 1 Apply 10 mVrms 45 75 MHz CW at the detector input Tune L1 for maximum AC signal at pin 25 measured with a 10x e DET FET probe or through capacitor to ...

Page 4

Design Parameters NOT TESTED OR GUARANTEED Typical Application Circuit Parameter Maximum System Operating Frequency IF Input Impedance (Differential Pin 7–8) 45 MHz IF Output Impedance 45 MHz IF Gain Control Range Detector Input Impedance 45 MHz Detector Output Bandwidth Detector ...

Page 5

Application Notes Refer to Typical Application Circuit COMMENTS ON RF Coupling The LM1823 is a high gain RF system which is critically dependent on the ground plane and positioning of the exter- nal components For this reason it is suggested ...

Page 6

Application Notes (Continued) Refer to Typical Application Circuit Pin 15-Supply Decouple Pin additional connec- tion to the 12V supply to allow RF decoupling on the detec- tor side of the chip Pin 16-Video Output Pin 16 is ...

Page 7

Application Notes (Continued) Refer to Typical Application Circuit work shown in the Typical Application sets up the output at supply it could easily be changed to equal-valued resistors When setting up the AFC detector the tank should always be tuned ...

Page 8

... 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 Package (N) Order Number LM1823N NS Package Number N28B 2 A critical component is any component of a life ...

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