Level Sensor. LA2000 Datasheet
Ordering number: EN982C
Monolithic Linear IC
Audio Level Sensor
LA2000 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.
unit : mm
. Radio-cassette recorders
. Cassette decks
. Car stereos
. Detection of spaces between programs recorded on tape
. Detection of end of tape
. Has transistors capable of driving plungers with maximum
600 mA, and a protective diode to prevent induced reverse
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.
SANYO : SIP9
Maximum Ratings at Ta = 25 °C
–20 to +75 °C
–40 to +125 °C
Note: 1. The voltage at pin 8 must not exceed the supply
voltage at pin 9.
2. The maximum current flowing into pin 8 should be
no greater than 0.5 mA.
Any and all SANYO products described or contained herein do not have specifications that can handle
applications that require extremely high levels of reliability, such as life-support systems, aircraft’s
control systems, or other applications whose failure can be reasonably expected to result in serious
physical and/or material damage. Consult with your SANYO representative nearest you before using
any SANYO products described or contained herein in such applications.
SANYO assumes no responsibility for equipment failures that result from using products at values that
exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other
parameters) listed in products specifications of any and all SANYO products described or contained
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Operating Conditions at Ta = 25°C
Operating voltage range
Electrical Characteristics at Ta = 25°C, VCC = 9.0 V, f = 1 kHz
Output transistor saturating
Output diode forward voltage
Output-off level in input
Pin 8 high level
Output transistor leakage
Output diode leakage current
f = 1 kHz, VIN = –45 dB
I6 = 600 mA
IF = 600 mA
f = 1 kHz
3.5 to 14
min typ max Unit
6 12 mA
1.5 2.5 V
1.5 2.0 V
–43 –50 –54 dBm
3.0 3.5 4.0 V
1.8 2.2 2.6 V
1. Description of external parts
C1 Input coupling capacitor
C2 NF capacitor
For designation of time delays
Power supply ripple filter
2. Individual pins and their operations
0.47 to 2.2 µF recommended.
Capacitance is reduced, so the off level in input equivalent becomes lower in
the bass frequency range. We recommend 1 to 10 µF.
Any time delay can be obtained by adequate choice of C3 and R1. We
recommend 150 k to 500 kΩ for R1.
For diode when pin 8 is used to drive external transistors. A 1 kΩ resistor is
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 6 and 8 turn
.over. (VIN = –45 dBm).
Pin 6 is for driving plungers, When it is on the ‘‘L’’ side, pin 6 turns on and can draw current up to 600 mA maximum
(restricted by duty-cycle chart). It is not to be on continuously for more than 3 seconds.
. Pin 7 is a diode that prevents reverse voltages induced when the plunger is turned off from on.
. Pin 8 functions in phase with pin 6 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.
E0 = – eτ
E0 : Initial voltage
E1 : Threshold voltage
τ : Time constant
t = –τIn
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 150 k to 500 kΩ for R when determining CR.
.4. IC usage notes
When maximum ratings are surpassed, destruction or deterioration may result. Use the IC in the range where the maximum
. rating is not exceeded.
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 8 should never exceed pin 9 voltage.
. The current flowing into pin 8 is to be 0.5 mA maximum.
. Pin 4 is unconnected, but is not to be used for GND or an interconnecting terminal.
I6 – Duty cycle
Ta = 60°C
Pd max – Ta
Duty cycle – %
Note: IC = 600 mA continuous is within 3 seconds
IC = 300 mA continuous is within 30 seconds
IC = 100 mA or less can be left on at all times.
Ambient temperature, Ta – °C