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参数资料
| 型号： | LA2000M |
| 元件分类： | 模拟信号调理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PDSO8 |
| 封装： | 0.225 INCH, MFP-8 |
| 文件页数： | 5/8页 |
| 文件大小： | 107K |
| 代理商： | LA2000M |
LA2000M
No.4158-5/8
1. Externally connected components
C1
Input coupling capacitor
: 0.47 to 2.2
μF recommended.
C2
NF capacitor
: Capacitance is reduced, so the off level in input equivalent becomes lower
in the bass frequency range. We recommend 1 to 10
μF.
C3, R1
For designation of time delays
: Any time delay can be obtained by adequate choice of C3 and R1. We
recommend 150k
Ω to 500kΩ for R1.
C4, R3
Power supply ripple filter
R2
Bias resistor
: For diode when pin 7 is used to drive external transistors. A 1k
Ω resistor is
recommen.
2. Individual pins and their operations
As shown above, when input level is raised and the pin 2 voltage reaches the VTH-H level of the comparator, pins 5 and
7 turn over. (VIN = -45dBm).
Pin 5 is for driving plungers, When it is on the “L” side, pin 5 turns on and can draw current up to 50mA 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 -45dBm 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
eτ
Accordingly,
t = -
τIn
E1
E0
E1/E0, within the IC, is 0.26. A desired time is obtained by an appropriate choice of
τ (τ = C3R1). Therefore, the time
delay is obtained by the following formula :
t = 1.34
× C3R1 (sec)
We recommend 150k
Ω to 500kΩ for R when determining CR.
4. IC usage notes
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 0.5mA maximum.
E0 : Initial voltage
E1 : Threshold voltage
τ : Time constant
pin7
pin5
pin2
Gnd
pin7
pin5
VIN
Gnd
high
low
off
on
time
delay
high
low
off
VTH-H
on
-60
-50
-40
-30
VTH-L
Input signal level, VIN – dBm
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