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Número de pieza | TA8155FN | |
Descripción | REC / PB System Dual Pre-amplifier | |
Fabricantes | Toshiba Semiconductor | |
Logotipo | ||
Hay una vista previa y un enlace de descarga de TA8155FN (archivo pdf) en la parte inferior de esta página. Total 17 Páginas | ||
No Preview Available ! TA8155F / FN
TOSHIBA Bipolar Linear Integrated Circuit Silicon Monolithic
TA8155F,TA8155FN
REC / PB System Dual Pre−amplifier (1.5 / 3V USE)
The TA8155F and TA8155FN are REC / PB system dual pre
amplifier ICs, which are developed for low voltage operation (1.5 /
3V use). These are especially suitable for a stereo headphone
cassette player.
Features
· Built−in dual playback amplifiers.
Input coupling condenser−less.
Built−in capacitor for buzz noise.
· Built−in dual buffer amplifiers.
For radio signal inut.
Monitor for REC mode.
· Built−in dual microphone amplifiers.
B uilt−in an ALC circuit for MIC−REC mode.
Attack time. : 0.1s (typ.)
Recovery time. : 3.5s (typ.)
· Built−in dual recording amplifiers.
Single−end output type.
· Built−in a power switch.
· Low quiescent current. (VCC = 1.2V, Ta = 25°C)
PB mode . ................... ICCQ2 = 2.6mA (typ.)
Radio mode ............. ICCQ3 = 2.4mA (typ.)
Radio−REC mode ... ICCQ4 = 3.0mA (typ.)
MIC−REC mode ... ..... ICCQ5 = 4.5mA (typ.)
· Low power dissipation.
PB mode : 2.9mW (typ.)
MIC−REC mode : 8.9mW (typ.)
· Operating supply voltage range. (Ta = 25°C)
VCC (opr) = 0.9~4V
VCC (opr) (REC) = 1.8~4V
Weigh
SSOP24-P-300-1.00: 0.32g (typ.)
SSOP24-P-300-0.65A: 0.14g (typ.)
1 2002-10-30
http://www.Datasheet4U.com
1 page TA8155F / FN
Application Note
(1) PW SW
It is necessary to connect an external pull-down resistor with the terminal PW SW (pin(12)), in case that this IC
is turned on due to external noise etc.
(2) Mode SW T
able.1 IC mode
IC mode is determined by switch condition
of RED SW (pin(11)) and LINE SW (pin(15))
(Table.1)
H level: Bias current should be applied
to switch terminal more than 5µA.
L level: Bias voltage should be applied to
switch terminal from 0V to 0.3V.
LINE SW
REC SW
LH
L
PB mode
(PB)
H
Radio mode
(BUF)
( ) : Operating amplifier.
MIC-REC
(BUF,MIC,REC)
Radio-REC mode
(BUF,REC)
The leak current flows through the terminal of REC SW (pin(11)) or LINE SW (pin(15)), in case that the
terminals connected with VCC line independently, even though this IC is off-mode (the terminal of PW SW
(pin(12)) is off-mode).
And it is necessary to connect an external pull-down resistor with the terminal REC SW (pin(11)) and LINE SW
(pin(15)), in case that this IC is turned on due to external noise etc.
(3) Playback amplifier
Output voltage of playback amplifier is determined by an external resistor R1 and Rf.
VO
(PRE)
=
VREF-∆V-Rf
(
DV
R1
- IB(NF) )
∆V is an off-set voltage which is designed to 18mV.
In case that β of transistor is assumed 100, IB(NF) is flowed 0.2µA in Fig.1. And output voltage of playback
amplifier (pin (8),(9)) in Fig.1 is
VO (PRE) = 0.85V-0.018V- (330kΩ+13kΩ)
x
(
0.018V
18kW
-
0.2mA )
=
0.56(V)
Output voltage of playback amplifier should be fixed VCC / 2,
because playback amplifier get a enough dynamic range.
And current source of 20µA is operated except playback
mode, in order to reduce a pop sound in
swichover between playback on / off mode (Fig.2).
Fig.1 DC output voltage of
playback amplifier.
5 2002-10-30
5 Page TA8155F / FN
11 2002-10-30
11 Page |
Páginas | Total 17 Páginas | |
PDF Descargar | [ Datasheet TA8155FN.PDF ] |
Número de pieza | Descripción | Fabricantes |
TA8155F | REC / PB System Dual Pre-amplifier | Toshiba Semiconductor |
TA8155FN | REC / PB System Dual Pre-amplifier | Toshiba Semiconductor |
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