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
Applications
.
Detection of spaces between programs recorded on tape
.
Detection of end of tape
.
Other
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.
Package Dimensions
unit : mm
3032B-MFP8
[LA2000M]
SANYO : MFP8
Specifications
Maximum Ratings
at Ta = 25C
Parameter
Symbol
Conditions
Ratings
Unit
Maximum supply voltage
V
CC
max
15
V
Allowable power dissipation
Pd max
300
mW
Flow-in current
I
6
max
50
mA
Operating temperature
Topr
-20 to +75
C
Storage temperature
Tstg
-40 to +125
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.
Ordering number: EN4158
Monolithic Linear IC
LA2000M
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
Operating Conditions
at Ta = 25C
Parameter
Symbol
Conditions
Ratings
Unit
Operating supply voltage
V
CC
op
3.5 to 14
V
Operating Characteristics
at Ta = 25C, V
CC
= 9.0 V, f = 1 kHz
Parameter
Symbol
Conditions
min
typ
max
Unit
Circuit current
I
CC
f = 1 kHz, V
IN
= -45 dBm
6
12
mA
Output transistor saturating
voltage
V
CE (sat)
I
6
= 50 mA
0.5
1.8
V
Output diode forward voltage
V
F
I
F
= 50 mA
0.7
1.5
V
Output-off level in input
equivalent
V
IN
f = 1 kHz
-43
-50
-54
dBm
Comparator-on level
V
TH-H
3.0
3.5
4.0
V
Comparator-off level
V
TH-L
1.8
2.2
2.6
V
Pin 7 high level
V
7
pin
0.45
0.55
V
Output transistor leakage
current
I
L-TR
100
A
Output diode leakage current
I
L-Di
100
A
Equivalent Circuit Block Diagram
Allowable
power
dissipation,
Pd
max
-
m
W
Ambient temperature, Ta - C
LA2000M
No.4158-2/7
Test Circuit
Test Conditions
Test items
Symbol
SW-1
SW-2
SW-3
SW-4
Conditions
Circuit current
I
CC
1
1
1
3
Measure current flowing into pin 8 at
V
IN
= -45 dB
Output transistor saturation voltage
V
CE (sat)
2
2
2
3
Measure V
IN
at pin 5
Output diode forward voltage
V
F
2
4
2
1
Measure V
IN
at pin 5
Output-off level in input equivalent
V
IN
1
1
1
3
Input level (v.v) when pin 5 turns
over
Comparator-on level
V
H
2
3
1
3
Measure V
3
when pin 5 turns over
Comparator-off level
V
L
2
3
1
3
Measure V
3
when pin 5 turns over
Pin 7 high level
Vp-7
2
4
1
3
Measure V
2
at pin 7
Output transistor leakage current
I
TL
2
4
3
3
Measure M3
Output diode leakage current
I
DL
2
4
4
2
Measure M2
Sample Application Circuit 1
Unit (resistance:
, capacitance: F)
Mechanism-coupled switch
(OFF at play mode)
Plunger
Unit (resistance:
, capacitance: F)
LA2000M
No.4158-3/7
Sample Application Circuit 2
1.
Externally connected components
C1
Input coupling capacitor
0.47 to 2.2 F 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 F.
C3, R1
For designation of time delays
Any time delay can be obtained by adequate choice of C3 and R1. We recommend
150 k
to 500 k
for R1.
C4, R3
Power supply ripple filter
R2
Bias resistor
For diode when pin 7 is used to drive external transistors. A 1 k
resistor is
recommended.
Use a mechanism for the plunger off while
functioning for program selection
Unit (resistance:
, capacitance: F)
LA2000M
No.4158-4/7
2.
Individual pins and their operations
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
E0 : Initial voltage
E1 : Threshold voltage
: Time constant
Accordingly,
t = -
In
E1
E0
E1/E0, within the IC, is 0.26. A desired time delay is obtained by an appropriate choice of
(
= 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 k
to 500 k
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.
Input signal level, V
IN
- dBm
LA2000M
No.4158-5/7
I
CC
- V
CC
Circuit
current,
I
CC
-m
A
Supply voltage, V
CC
- V
Quiescent
Operating
V
2
pin, V
H
, V
L
- V
CC
V
2
pin,
V
H
,V
L
-V
Supply voltage, V
CC
- V
V
IN
- V
CC
Input
level,
V
IN
-
dBm
Off
On
Supply voltage, V
CC
- V
V
IN
- f
Input
level,
V
IN
-
dBm
Input level when pin 5
[L]
[H]
Frequency, f - Hz
V
2
pin - f
V
2
p
i
n-V
Frequency, f - Hz
V
2
pin - V
IN
V
2
p
i
n-V
Input level, V
IN
- dBm
V
2
pin - V
CC
V
2
p
i
n-V
Supply voltage, V
CC
- V
V
CE (sat)
- I
C
Output
transistor
saturation
voltage,
V
CE
(sat)
-V
Collector current, I
C
- mA
LA2000M
No.4158-6/7
No products described or contained herein are intended for use in surgical implants, life-support systems, aerospace equipment,
nuclear power control systems, vehicles, disaster/crime-prevention equipment and the like, the failure of which may directly or
indirectly cause injury, death or property loss.
Anyone purchasing any products described or contained herein for an above-mentioned use shall:
1
Accept full responsibility and indemnify and defend SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors
and all their officers and employees, jointly and severally, against any and all claims and litigation and all damages, cost and
expenses associated with such use:
2
Not impose any responsibility for any fault or negligence which may be cited in any such claim or litigation on SANYO
ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors or any of their officers and employees jointly or severally.
Information (including circuit diagrams and circuit parameters) herein is for example only; it is not guaranteed for volume
production. SANYO believes information herein is accurate and reliable, but no guarantees are made or implied regarding its use
or any infringements of intellectual property rights or other rights of third parties.
This catalog provides information as of April, 1996. Specifications and information herein are subject to change without notice.
V
F
- Di
Output
diode
forward
voltage,
V
F
-V
Diode forward current, Di - mA
V
2
pin - Ta
V
2
p
i
n-V
Ambient temperature, Ta - C
V
2
pin - Ta
V
2
p
i
n-m
W
Ambient termperature, Ta - C
V
IN
- Ta
Input
level,
V
IN
-
dBm
Off level
On level
Ambient temperature, Ta - C
I
CC
- Ta
Circuit
current,
I
CC
-m
A
Ambient temperature, Ta - C
LA2000M
No.4158-7/7
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