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參數(shù)資料
| 型號： | LA3242 |
| 廠商： | Sanyo Electric Co.,Ltd. |
| 英文描述： | Preamplifier for Compact Cassette Recorder Recording-only Use |
| 中文描述： | 對小型收錄機錄音前置放大器，僅使用 |
| 文件頁數(shù)： | 6/12頁 |
| 文件大?。?/td> | 480K |
| 代理商： | LA3242 |
IC usage Notes
(1) The base of a PNP transistor is connected to input pins 2 and 23.
When a voltage is applied to input pins 2 and 23 externally, connect a
capacitor to the input pins. The recommended value of capacitor C is
0.1 μF to 10 μF. DC voltage V
INDC
with input pins 2 and 23 open is
50 mV max (V
INDC
= 20 mV typ).
(2) Output waveform starting time (Refer to Data t
s
– C
r
.)
When supply voltage V
CC
is switched ON, the amplifier output (pins 7 and 18) will rise. Output waveform ON time ts can be
varied by capacitor Cr connected to pin 12. The minimum value of Cr is 33 μF. If the value of Cr is made less than 33 μF, more
pop noise will occur and the ripple rejection will worsen at the time supply voltage V
CC
is switched ON. (ts = 0.7 s. typ at
Cr = 100 μF)
(3) Electronic switch control circuit
The control circuit for control pins 9 and 16 is configured as
shown left.
Control level V
CONT
of the control circuit is given by:
V
CONT
= 1/2
×
(V
CC
– 0.9) [V]
(4) Relation between control voltage to turn ON/OFF electronic switch and supply voltage (Refer to Data V
CONT
– V
CC
.)
The control level at electronic switch CONT pin 9 and 16 is fixed
by supply voltage V
CC
. The threshold region has a range of
approximately 1 V. The middle point of threshold region at a
given value of supply voltage V
CC
is represented by approximately
1/2
×
(V
CC
– 0.9) V.
The electronic switch can be turned ON/OFF by applying a
voltage of the middle point voltage
±
0.5 V or more/less,
respectively, to electronic switch CONT pins 9 and 16.
For the relation between supply voltage V
CC
and V
INDC
, refer to the V
CC
– V
INDC
characteristic.
Rise waveform at pin 7 or 18
Control
pin
.
4 μAmin
Electronic
SW ON
signal
Electronic SW OFF
Electronic SW ON
Threshold region (
.
1 V)
LA3242
No.2620-6/12
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