SANYO LA2000 Datasheet
Ordering number: EN982C
Monolithic Linear IC
LA2000
Audio Level Sensor
Overview
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.
Used in
.
Radio-cassette recorders
.
Cassette decks
.
Car stereos
Applications
.
Detection of spaces between programs recorded on tape
.
Detection of end of tape
.
Other
Features
.
Has transistors capable of driving plungers with maximum
600 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.
Package Dimensions
unit : mm
3017B-SIP9
[LA2000]
SANYO : SIP9
Specifications
Maximum Ratings atTa=25°C
Parameter Symbol Conditions Ratings Unit
Maximum supply voltage V
Allowable power dissipation Pd max 540 mW
Flow-in current I
Operating temperature Topr –20 to +75 °C
Storage temperature Tstg –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.
max 15 V
CC
max 600 mA
6
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53096HA(II)/0267KI/5085MW/MW No.982-1/8
LA2000
Operating Conditions at Ta = 25°C
Parameter Symbol Conditions Ratings Unit
Operating voltage range V
Electrical Characteristics at Ta = 25°C, VCC=9.0V,f=1kHz
Parameter Symbol Conditions min typ max Unit
Circuit current I
Output transistor saturating
voltage
Output diode forward voltage V
Output-off level in input
equivalent
Comparator-on level V
Comparator-off level V
Pin 8 high level V
Output transistor leakage
current
Output diode leakage current I
1. Description of external parts
CC
V
CE (sat)I6
V
TH-H
TH-L
8
I
L-TR
L-Di
op 3.5 to 14 V
CC
f = 1 kHz, VIN= –45 dB 6 12 mA
= 600 mA 1.5 2.5 V
IF= 600 mA 1.5 2.0 V
F
IN
f = 1 kHz –43 –50 –54 dBm
pin 0.45 0.55 V
3.0 3.5 4.0 V
1.8 2.2 2.6 V
100 µA
100 µA
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
C3, R1 For designation of time delays Any time delay can be obtained by adequate choice of C3 and R1. We
C4, R3 Power supply ripple filter
R2 Bias resistor For diode when pin 8 is used to drive external transistors. A 1 kΩ resistor is
the bass frequency range. We recommend 1 to 10 µF.
recommend 150 k to 500 kΩ for R1.
recommended.
2. Individual pins and their operations
V
IN
Input signal level, VIN– dBm
As shown above, when input level is raised and the pin 2 voltage reaches the V
over. (V
.
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 ).
= –45 dBm).
IN
level of the comparator, pins 6 and 8 turn
TH-H
No.982-2/8
LA2000
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.
=−
t
τ
e
E0 : Initial voltage
E1 : Threshold voltage
τ : Time constant
E1
E0
Accordingly,
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
.
Maximum ratings
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.
E1
E0
Note: I
I6– Duty cycle
–mA
6
Collector current, I
Duty cycle – %
= 600 mA continuous is within 3 seconds
C
I
= 300 mA continuous is within 30 seconds
C
I
= 100 mA or less can be left on at all times.
C
Ta = 60°C
or lower
Allowable power dissipation, Pd max – mW
Pd max – Ta
Ambient temperature, Ta – °C
No.982-3/8
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