LMC835N

Manufacturer Part NumberLMC835N
DescriptionIC GRAPHIC EQUALIZER DGTL 28-DIP
ManufacturerNational Semiconductor
TypeEqualizer
LMC835N datasheet
 


Specifications of LMC835N

ApplicationsReceiverMounting TypeThrough Hole
Package / Case*Lead Free Status / RoHS StatusContains lead / RoHS non-compliant
Other names*LMC835N
LMC835
  
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LMC835 Digital Controlled Graphic Equalizer
General Description
The LMC835 is a monolithic digitally-controlled graphic
equalizer CMOS LSI for Hi-Fi audio The LMC835 consists
of a Logic section and a Signal Path section made of analog
switches and thin-film silicon-chromium resistor networks
The LMC835 is used with external resonator circuits to
make a stereo equalizer with seven bands
dB gain range and 25 steps each Only three digital inputs
are needed to control the equalization The LMC835 makes
it easy to build a P-controlled equalizer
The signal path is designed for very low noise and distor-
tion resulting in very high performance compatible with
PCM audio
Connection Diagrams
Dual-In-Line Package
Top View
Order Number LMC835N
See NS Package N28B
C 1995 National Semiconductor Corporation
TL H 6753
Features
No volume controls required
Y
Three-wire interface
Y
14 bands 25 steps each
Y
12 dB or
6 dB gain ranges
Y
g
g
Low noise and distortion
Y
12 dB or
6
g
g
TTL CMOS logic compatible
Y
Applications
Hi-Fi equalizer
Y
Receiver
Y
Car stereo
Y
Musical instrument
Y
Tape equalization
Y
Mixer
Y
Volume controller
Y
Molded Chip Carrier Package
Order Number LMC835V
See NS Package V28A
TL H 6753– 1
February 1995
TL H 6753– 26
Top View
RRD-B30M75 Printed in U S A

LMC835N Summary of contents

  • Page 1

    ... The signal path is designed for very low noise and distor- tion resulting in very high performance compatible with PCM audio Connection Diagrams Dual-In-Line Package Top View Order Number LMC835N See NS Package N28B C 1995 National Semiconductor Corporation TL H 6753 Features No volume controls required ...

  • Page 2

    Block Diagram 2 ...

  • Page 3

    ... Absolute Maximum Ratings If Military Aerospace specified devices are required please contact the National Semiconductor Sales Office Distributors for availability and specifications Supply Voltage Allowable Input Voltage (Note 1) Storage Temperature T b stg Lead Temperature (Soldering 10 sec) N Pkg Lead Temperature V Pkg Vapor Phase (60 sec) ...

  • Page 4

    Electrical Characteristics SIGNAL PATH SECTION Symbol Parameter E Gain Error THD Total Harmonic A Distortion Maximum Output Voltage A O Max S N Signal to Noise Ratio A ...

  • Page 5

    Truth Tables DATA I (Band Selection ...

  • Page 6

    Test Circuits FIGURE 3 Test Circuit for AC Measurement FIGURE 4 Test Circuit for Leakage Current Measurement 6753 – 6753 – 6 ...

  • Page 7

    Test Circuits (Continued) Typical Performance Characteristics Supply Current vs Supply Voltage TL H 6753 – 7 FIGURE Converter FIGURE 6 Simple Word Generator Supply Current vs Temperature 6753– 8 Input Capacitance vs Input ...

  • Page 8

    Typical Performance Characteristics Maximum Output Voltage vs Supply Voltage Distortion vs Frequency 12 dB Range g Distortion vs Output Voltage 6 dB Range g Gain vs Frequency 6 dB Range (Boost) g (Continued) Maximum Output Voltage Nominal Resistor vs Temperature ...

  • Page 9

    Typical Applications TABLE I Tuned Circuit Elements 12dB Z1 f (Hz) C ( 100k Z2 160 ...

  • Page 10

    Typical Applications (Continued) Performance Characteristics (Circuit of Figure 7 ) LMC835 Gain vs Frequency 12 dB Range g (All Boost or Cut) LMC835 Gain vs Frequency 6 dB Range g (All Boost or Cut) LMC835 Gain vs Frequency 12 dB ...

  • Page 11

    Typical Applications (Continued) TABLE II Tuned Circuit Elements (Hz) C ( 100k ...

  • Page 12

    Typical Applications (Continued) FIGURE 11 Single Supply Stereo Equalizer TL H 6753 – The output is used to bias the gyrators ...

  • Page 13

    Typical Applications (Continued) FIGURE 12 Stereo 7-Input 1-Output Mixers (THD is not as low as equalizer circuit) FIGURE 14 LMC835-COP404L CPU Interface TL H 6753– 18 FIGURE 13 Stereo Volume Control Very Low THD 6753 – 19 ...

  • Page 14

    Typical Applications (Continued) Sample Subroutine Program for Figure 14 LMC835-COP404L CPU Interface HEX CODE LABEL MNEMONICS 3F LMC835 LBI 05 SEND 335F OGI 4F XAS XDS XAS XDS ...

  • Page 15

    Application Hints (Continued) MODEL REDUCING EXTERNAL COMPONENTS The typical application shown in Figure 7 is switching noise free The DC-coupled circuit in Figure 16 is also switching noise free except switch turn ON OFF This ...

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    16 ...

  • Page 17

    ... Physical Dimensions inches (millimeters) Order Number LMC835N NS Package N28B 17 ...

  • Page 18

    ... National Semiconductor National Semiconductor National Semiconductores Japan Ltd Hong Kong Ltd Do Brazil Ltda Sumitomo Chemical 13th Floor Straight Block ...