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PDF STK301-220 Data sheet ( Hoja de datos )
| Número de pieza | STK301-220 | |
| Descripción | 7-Band / 2-Channel Electronic Graphic Equalizer | |
| Fabricantes | Sanyo | |
| Logotipo |  |
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Ordering number : EN4793A
Thick-Film Hybrid IC
STK301-220
7-band, 2-channel Electronic Graphic Equalizer
Overview
The STK301-220 is a hybrid IC (HIC) for electronically
controlled graphic equalizer applications and is equipped
with on-chip electronic volume control for 7-band, 2-
channel graphic equalization, thereby permitting one-
touch up-down control of all band gains. The STK301-
220 is a hybrid IC which combines SC system and
photoresist techniques with folded board construction
while incorporating Sanyo’s unique insulated metal
substrate technology (IMST) to the base.
Applications
• Car stereos
• Portable radio-cassette players
• Home stereos
Features
• All bands are set for L/R simultaneous 2 dB incremental
operation (typ).
• All bands are equipped with 13 positions and range
between +12 dB maximum boost to –12 dB maximum cut.
• Crossover frequencies include fo; 60 Hz, 150 Hz,
400 Hz, 1 kHz, 2.5 kHz, 6 kHz and 15 kHz.
• The following features can be made available with an
electronic graphic equalizer system which incorporates
the 3-IC construction consisting of the STK301-220, a
controller (universal microcontroller) along with the
display LSI (LC75821→LCD, LC7565→FLT, LED):
— One-touch up-down control of all band gains.
— Immediate recall of preferred frequency levels tailored
to suit musical selections. This is possible using preset
functions to retrieving items from one-touch memory.
— Such functions as setting all bands to 0 dB (flat
function), or switching frequency characteristics
from 0 dB to center (reverse function) may be
simply performed with supported software.
— Dual control lines permit mutual use with display
LSI and help to simplify wiring between
microcontroller and LSI.
• Minimal operating shock noise when boost or cut is used.
Package Dimensions
unit : mm
4143
[STK301-220]
Specifications
Maximum Ratings at Ta = 25°C, VSS = 0 V
Parameter
Maximum supply voltage
Input voltage
Allowable power dissipation
Operating temperature
Storage temperature
Symbol
VDD-VEE max
VCC1 max
VCC2 max
VI1
VI2
Pd max
Topr
Tstg
CLK, DI, IN1, IN2
CLK, DI, IN1, IN2
Conditions
Ratings
16
±18 (36)
7
0 to VCC2 + 0.3
VEE – 0.3 to VDD + 0.3
920
–20 to +70
–40 to +100
Unit
V
V
V
V
V
mW
°C
°C
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN
N3096HA (OT)/82294TH (OT) 5-3398 No. 4793-1/8
1 page  
STK301-220
Pins f (1) through f (7) are used as pin connections for the
LC7522 band filter. Supported frequencies and their pin
assignments are listed in the following.
Pin Name Frequency
f (1) 60Hz
f (2) 150Hz
f (3) 400Hz
f (4) 1kHz
f (5) 2.5kHz
f (6) 6kHz
f (7) 15kHz
In order to minimize the noise which occurs during changeover,
connections are made using 1 MΩ resistors from pins f (1)
through f (7) to 1/2 VCC1.
Resistor Equivalent Circuit
(single band)
Principles of Operation
The graphic equalizer section is constructed from 7 resonance circuits and output buffer amplifiers (every channel);
variable resistors (LC7522) and resonance circuit capacitors C1 and C2 are built-in. Resonance circuits utilize
semiconductor inductors and apply resonation to reduced impedance; all frequency gains are altered.
1. Resonance Circuit
Semiconductor inductors replace the L of the R, L, C series
resonance circuit with a CR element passing through the
buffer function of active elements such as the transistor and
op-amp (operational amplifier), thereby effecting the
equivalent operation of a R, L, C series resonance circuit.
The STK301-220 resonance circuit buffer is constructed
using transistors and arranged as illustrated in Figure 2.
Resonance frequency fo is determined using the following
formula:
fo = 1
2π C1 · C2 · R1 · R2
2. Flat, Boost and Cut
Gains matching resonance circuit frequency gains are altered
by altering the built-in resonance circuits and electronic
volume control. Figure 3 is presented to describe the
equivalent circuit. Z represents the impedance of the
resonance circuit in Figure 2.
Figure 2 Resonance Circuit
Figure 3 Equivalent Circuit
No. 4793-5/8
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet STK301-220.PDF ] | |
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