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.
Package Dimensions
unit : mm
3032B-MFP8
[LA2000M]
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
SANYO : MFP8
.
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
V
CC
max
Pd max
I
6
max
Topr
Tstg
Conditions
Ratings
15
300
50
−20 to +75
−40 to +125
Unit
V
mW
mA
°C
°C
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.
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
LA2000M
Operating Conditions
at Ta = 25°C
Parameter
Operating supply voltage
Symbol
V
CC
op
Conditions
Ratings
3.5 to 14
Unit
V
Operating Characteristics
at Ta = 25°C, V
CC
= 9.0 V, f = 1 kHz
Parameter
Circuit current
Output transistor saturating
voltage
Output diode forward voltage
Output-off level in input
equivalent
Comparator-on level
Comparator-off level
Pin 7 high level
Output transistor leakage
current
Output diode leakage current
Symbol
I
CC
V
CE (sat)
V
F
V
IN
V
TH-H
V
TH-L
V
7
pin
I
L-TR
I
L-Di
Conditions
f = 1 kHz, V
IN
= −45 dBm
I
6
= 50 mA
I
F
= 50 mA
f = 1 kHz
−43
3.0
1.8
0.45
min
typ
6
0.5
0.7
−50
3.5
2.2
0.55
max
12
1.8
1.5
−54
4.0
2.6
Unit
mA
V
V
dBm
V
V
V
µA
µA
100
100
Allowable power dissipation, Pd max − mW
Ambient temperature, Ta − °C
Equivalent Circuit Block Diagram
No.4158-2/7
LA2000M
Test Circuit
Unit (resistance:
Ω,
capacitance: F)
Test Conditions
Test items
Circuit current
Output transistor saturation voltage
Output diode forward voltage
Output-off level in input equivalent
Comparator-on level
Comparator-off level
Pin 7 high level
Output transistor leakage current
Output diode leakage current
Symbol
I
CC
V
CE (sat)
V
F
V
IN
V
H
V
L
Vp-7
I
TL
I
DL
SW-1
1
2
2
1
2
2
2
2
2
SW-2
1
2
4
1
3
3
4
4
4
SW-3
1
2
2
1
1
1
1
3
4
SW-4
3
3
1
3
3
3
3
3
2
Conditions
Measure current flowing into pin 8 at
V
IN
= −45 dB
Measure V
IN
at pin 5
Measure V
IN
at pin 5
Input level (v.v) when pin 5 turns
over
Measure V
3
when pin 5 turns over
Measure V
3
when pin 5 turns over
Measure V
2
at pin 7
Measure M3
Measure M2
Sample Application Circuit 1
Mechanism-coupled switch
(OFF at play mode)
Plunger
Unit (resistance:
Ω,
capacitance: F)
No.4158-3/7
LA2000M
Sample Application Circuit 2
Use a mechanism for the plunger off while
functioning for program selection
Unit (resistance:
Ω,
capacitance: F)
1.
C1
C2
Externally connected components
Input coupling capacitor
NF capacitor
For designation of time delays
Power supply ripple filter
Bias resistor
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 kΩ to 500 kΩ for R1.
For diode when pin 7 is used to drive external transistors. A 1 kΩ resistor is
recommended.
C3, R1
C4, R3
R2
No.4158-4/7
LA2000M
2.
Individual pins and their operations
Input signal level, V
IN
− dBm
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 = −τIn
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 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
IC:
.
These cause destruction7 or deterioration of thepin 8be careful when mounting on circuit board.
voltage.
.
Voltage applied to pin shouldisnever exceed maximum.
The current flowing into pin 7 to be 0.5 mA
No.4158-5/7
Talking
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