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PDF LA2000M Data sheet ( Hoja de datos )
| Número de pieza | LA2000M | |
| Descripción | Audio Level Sensor | |
| Fabricantes | Sanyo Semicon Device | |
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Ordering number: EN4158
Monolithic Linear IC
LA2000M
Audio Level Sensor
Overview
LA2000M is an IC for detecting interprogram spaces to pick
out the starting point of a program immediately preceding or
following a musical program recorded on tape, and to detect
end of tape.
Used in
. Radio-cassette recorders
. Cassette decks
. Car stereos
Package Dimensions
unit : mm
3032B-MFP8
[LA2000M]
Applications
. Detection of spaces between programs recorded on tape
. Detection of end of tape
. Other
SANYO : MFP8
Features
. Has transistors capable of driving plungers with maximum
50 mA, and a protective diode to prevent induced reverse
. voltages.
Can provide designated time delays by externally connected
. capacitors and resistors.
Has a comparator with stable hysteresis to handle variations
. in power supply voltage.
Detects unrecorded portions of tape.
Specifications
Maximum Ratings at Ta = 25°C
Parameter
Maximum supply voltage
Allowable power dissipation
Flow-in current
Operating temperature
Storage temperature
Symbol
VCC max
Pd max
I6 max
Topr
Tstg
Conditions
Note:1. The voltage at pin 7 must not exceed the supply voltage at pin 8.
2. The maximum current flowing into pin 7 should be no greater than 0.5 mA.
Ratings
15
300
50
−20 to +75
−40 to +125
Unit
V
mW
mA
°C
°C
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN
42896HA(II) No. 4158-1/7
1 page  
2. Individual pins and their operations
LA2000M
Input signal level, VIN − dBm
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 = −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 t
E0 = − eτ
Accordingly,
E1
t = −τIn
E0
E0 : Initial voltage
E1 : Threshold voltage
τ : Time constant
E1/E0, within the IC, is 0.26. A desired time delay 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 150 kΩ to 500 kΩ 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 0.5 mA maximum.
No.4158-5/7
5 Page | ||
| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet LA2000M.PDF ] | |
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