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PDF LMC835 Data sheet ( Hoja de datos )
| Número de pieza | LMC835 | |
| Descripción | LMC835 Digital Controlled Graphic Equalizer | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LMC835 (archivo pdf) en la parte inferior de esta página. Total 18 Páginas | ||
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February 1995
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 g12 dB or g6
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 mP-controlled equalizer
The signal path is designed for very low noise and distor-
tion resulting in very high performance compatible with
PCM audio
Features
Y No volume controls required
Y Three-wire interface
Y 14 bands 25 steps each
Y g12 dB or g6 dB gain ranges
Y Low noise and distortion
Y TTL CMOS logic compatible
Applications
Y Hi-Fi equalizer
Y Receiver
Y Car stereo
Y Musical instrument
Y Tape equalization
Y Mixer
Y Volume controller
Connection Diagrams
Dual-In-Line Package
Molded Chip Carrier Package
Top View
Order Number LMC835N
See NS Package N28B
TL H 6753 – 1
Top View
Order Number LMC835V
See NS Package V28A
TL H 6753 – 26
C1995 National Semiconductor Corporation TL H 6753
RRD-B30M75 Printed in U S A
1 page  
Truth Tables
DATA I (Band Selection)
D7 D6 D5 D4 D3 D2 D1 D0
HXL L L L L L
HXL L L L LH
HXL L L LHL
HX L L L LHH
HXL L LHL L
HXL L LHLH
HX L L LHHL
HX L L LHHH
HXL LHL L L
HXL LHL LH
HXL LHLHL
HX L LHLHH
HX L LHHL L
HX L LHHLH
HX L LHHHL
HX L LHHHH
HX L H
Valid Binary Input
HXHL
Valid Binary Input
HXHH
Valid Binary Input
u u u u w Band Code x
jklm
j DATA 1
k Don’t Care
l Ch A g6 dB g12 dB Range
m Ch B g6 dB g12 dB Range
(Ch A Band 1E7 Ch B Band 8E14)
Ch A g 12 dB Range Ch B g 12 dB Range No Band Selection
Ch A g 12 dB Range Ch B g 12 dB Range Band 1
Ch A g 12 dB Range Ch B g 12 dB Range Band 2
Ch A g 12 dB Range Ch B g 12 dB Range Band 3
Ch A g 12 dB Range Ch B g 12 dB Range Band 4
Ch A g 12 dB Range Ch B g 12 dB Range Band 5
Ch A g 12 dB Range Ch B g 12 dB Range Band 6
Ch A g 12 dB Range Ch B g 12 dB Range Band 7
Ch A g 12 dB Range Ch B g 12 dB Range Band 8
Ch A g 12 dB Range Ch B g 12 dB Range Band 9
Ch A g 12 dB Range Ch B g 12 dB Range Band 10
Ch A g 12 dB Range Ch B g 12 dB Range Band 11
Ch A g 12 dB Range Ch B g 12 dB Range Band 12
Ch A g 12 dB Range Ch B g 12 dB Range Band 13
Ch A g 12 dB Range Ch B g 12 dB Range Band 14
Ch A g 12 dB Range Ch B g 12 dB Range No Band Selection
Ch A g 12 dB Range Ch B g 6 dB Range Band 1E14
Ch A g 6 dB Range Ch B g 12 dB Range Band 1E14
Ch A g 6 dB Range Ch B g 6 dB Range Band 1E14
This is the gain if the g12 dB range is
selected by DATA I If the g6 dB
range is selected then the values
shown must be approximately halved
See the characteristics curves for
more exact data
DATA II (Gain Selection)
D7 D6 D5 D4 D3 D2 D1 D0
Flat L X L L L L L L
1 dB Boost
LHHL L L L L
2 dB Boost
LHLHL L L L
3 dB Boost
LHL LHL L L
4 dB Boost
LHL L LHL L
5 dB Boost
LHL L L LHL
6 dB Boost
LHLHL LHL
7 dB Boost
L HH L H L H L
8 dB Boost
L H L H L HH L
9 dB Boost
LHL L L L LH
10 dB Boost
LHHLHL LH
$ 11 dB Boost
L HH L HH L H
12 dB Boost
L HH L HHHH
1 dBE12 dB Cut L
L
Valid Above Input
n DATA II
o Boost Cut
uu
no
w Gain Code x
5
5 Page 
Typical Applications (Continued)
TABLE II Tuned Circuit Elements
Q0e4 7 Q12 dBe1 4
fo (Hz) Co (F) CL (F) RL (X) Ro (X)
Z1 16
3 3m
0 47m 100k
Z2 31 5 15m 0 22m 110k
Z3 63
1m
0 1m
100k
Z4 125 0 39m 0 068m 91k
Z5 250 0 22m 0 033m 82k
Z6 500
0 1m 0 015m 100k
Z7 1k 0 047m 0 01m 82k
Z8 2k 0 022m 0 0047m 91k
Z9 4k 0 01m 0 0022m 110k
Z10 8k 0 0068m 0 001m 82k
Z11 16k 0 0033m 680p
62k
Z12 32k 0 0015m 470p
68k
680
680
680
680
680
680
680
680
680
680
680
510
L0eCL RL R0
1
f0e2q0L0C0
0Q0e
L0
C0R02
Q12 dBeR0Ra0Q15090
TL H 6753 – 15
FIGURE 10 Tuned Circuit for
12-Band Equalizer (Figure 9 )
Performance Characteristics (Circuit of Figure 9)
12 Band Equalizer Application
LMC835 Gain vs Frequency
g6 dB Range
(All Boost or Cut)
LMC835 12 Band E Q Application
Gain vs Frequency
g12 dB Range
(1 kHz Boost or Cut)
12 Band Equalizer Application
LMC835 Gain vs Frequency
g 12 dB Range
(All Boost or Cut)
LMC835 12 Band E Q Application
Gain vs Frequency
g6dB Range
(1 kHz Boost or Cut)
TL H 6753 – 16
11
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet LMC835.PDF ] | |
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