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參數(shù)資料
| 型號： | LA2000M |
| 廠商： | Sanyo Electric Co.,Ltd. |
| 英文描述： | Audio Level Sensor |
| 中文描述： | 音頻電平傳感器 |
| 文件頁數(shù)： | 5/7頁 |
| 文件大?。?/td> | 138K |
| 代理商： | LA2000M |
2.
Individual pins and their operations
As shown above, when input level is raised and the pin 2 voltage reaches the V
TH-H
level of the comparator, pins 5 and 7 turn
over. (V
IN
= 45 dBm).
.
pin 5 is for driving plungers. When it is on the ‘‘L’’ side, pin 5 turns on and can draw current up to 50 mA maximum.
.
Pin 6 is a diode that prevents reverse voltages induced when the plunger is turned off from on.
.
Pin 7 functions in phase with pin 5 and can drive external transistors (such as for MUTE).
3.
Time delays and obtaining CRs
When input signals that have been applied at a level not less than 45 dBm are removed, discharging occurs through the CR
connected at pin 2, lowering pin 2 potential. A time delay is provided before the hysteresis comparator turns over.
E1
E0
=
t
e
τ
E0 : Initial voltage
E1 : Threshold voltage
τ
: Time constant
Accordingly,
t =
τ
In
E1
E0
E1/E0, within the IC, is 0.26. A desired time delay is obtained by an appropriate choice of
τ
(
τ
= C
3
R
1
). Therefore, the time delay
is obtained by the following formula:
t = 1.34
×
C
3
R
1
(sec)
We recommend 150 k
to 500 k
for R when determining CR.
Maximum ratings
When maximum ratings are surpassed, destruction or deterioration may result.
.
Interpin short circuits and reverse insertions
These cause destruction or deterioration of the IC: be careful when mounting on circuit board.
.
Voltage applied to pin 7 should never exceed pin 8 voltage.
.
The current flowing into pin 7 is to be 0.5 mA maximum.
4.
IC usage notes
Input signal level, V
IN
dBm
LA2000M
No.4158-5/7
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