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PDF LA3246 Data sheet ( Hoja de datos )
| Número de pieza | LA3246 | |
| Descripción | Stereo Preamplifier for Compact Double Cassette Playback-only Use | |
| Fabricantes | Sanyo Semicon Device | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LA3246 (archivo pdf) en la parte inferior de esta página. Total 13 Páginas | ||
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Ordering number: EN 2651B
Monolithic Linear IC
LA3246
Stereo Preamplifier for Compact Double Cassette
Playback-only Use
Overview
The LA3246 is a stereo preamplifier IC for double cassette
tape playback-only use. The LA3246 is intended for use in
portable radio-cassette tape recorders and tape decks.
Applications
. Stereo compact cassette player for playback-only use
. Stereo cassette deck player
Package Dimensions
unit : mm
3021B-DIP20
[LA3246]
Functions
. Preamplifier × 2, Mixing amplifier × 1, Electronic switch × 6
Features
. On-chip electronic switch for input select (auto reverse or
. A deck/B deck select)
On-chip electronic switch for normal/higher dubbing select
and electronic switch for metal/normal tape select
. Wide operating voltage range (VCC op = 3.5 to 14 V)
. With output MIX pin (for music select control)
. Low noise voltage range (VNI = 0.9 µV typ, Rg = 2.2 kΩ
. NAB)
Can be used in conjunction with the LA3240, 3241, 3242 to
easily make up a doublecassette dubbing system.
SANYO : DIP20 (300 mil)
Specifications
Maximum Ratings at Ta = 25°C
Parameter
Maximum supply voltage
Allowable power dissipation
Operating temperature
Storage temperature
Symbol
VCC max
Pd max
Topr
Tstg
Maxiumum Ratings at Ta = 25°C
Parameter
Recommended supply voltage
Operating voltage range
Symbol
VCC
VCC op
Conditions
Conditions
Ratings
16
500
–20 to +75
–40 to +125
Ratings
6
3.5 to 14
Unit
V
mW
°C
°C
Unit
V
V
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN
D3097HA(II)/41594HK/N107TA, TS No.2651-1/13
1 page  
LA3246
(3) When an electrolytic capacitor is connected to input pins 1, 2 (or 23, 24), make the value of RIN1 as equal to that of RIN2 as
possible.
The difference in the value between RIN1 and RIN2 causes the variation in amp output DC voltage at the time of F/R
switching. Therefore, the input DC voltage (voltage across RIN) must be made as equal as possible.
(4) The amplifier output characteristics are designed to be the same in the Nor Tape/High Speed (pin 15 GND/pin 6 VCC) and
Me Tape/Nor Speed (pin 15 VCC/pin 6 GND) modes. (Refer to sample application circuit, external constants.)
(5) When externally turning ON/OFF power supply pin 11 (by bringing pin 11 to +VCC/GND level) with a capacitor connected
to pin 13, connect external diode D, as shown below, so that no breakdown (or deterioration) of the IC system is caused by
ICD when the switch is turned OFF. When no capacitor is connected to pin 13, diode D is not required.
(6) The output MIX circuit is of the emitter follower configuration as shown below.
Unit (resistance: Ω)
The MIX OUT output level VO MIX at the time a signal is applied to preamp1 (or preamp2) only is 1/2 as compared with
output levels VO1, VO2 at the time the same input signal is applied to both channels.
VO MIX = 1/2 VO1(= 1/2 × VO2)
where VO1 = VO2
No.2651-5/13
5 Page 
VNO – Rg
LA3246
VNI – Rg
Signal source resistance, Rg – Ω
VGo – VCC
Signal source resistance, Rg – Ω
VG – fi
Supply voltage, VCC – V
Rr –fr
Input frequency, fi – Hz
Rr – Cr
Cr = 47 µF or greater
(Pin 12)
Ripple frequency, fr – Hz
tS – Cr
Capacitor for ripple filter (pin 12), Cr – µF
tS – CNF
Cr = 47 µF or greater
Capacitor for ripple filter (pin 12), Cr – µF
or less
Reverse transfer capacitance, CNF – µF
No.2651-11/13
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet LA3246.PDF ] | |
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