MITSUMI
IC for Multifunction Telephones LAG639
IC for Multifunction Telephones
Monolithic IC LAG639
This IC was developed for use in home-use telephone and small-scale telephone systems, and incorporates
data transmission functions (AMI).
Features
1. Incorporates efficient switching regulator with broad input voltage range
V
OUT
5V0.25 I
L
250mA (13~45V)
V
IN
15~45V
2. Internal data transmission/reception circuits
Data can be superposed on the power supply line for transmission.
AMI format is used for transmission route coding.
3. Internal system reset circuit
5V line abnormal voltage detection circuit
Watchdog timer reset circuit
4. Internal speaker amp
260 mW typ. at 8
load
Mute pin
5. Internal beep sound generator circuit
With pin to vary audio volume (also used to turn beep sound on and off)
Package
SDIP-30A (LAG639D)
Item
Symbol
Ratings
Units
Operating temperature
T
OPR
-20~+70
C
Storage tempereture
T
STG
-40~+125
C
Power supply voltage
V
CC
max.
46
V
Allowable loss
Pd
750
mW
Absolute Maximum Ratings
(Ta=25
C)
Outline
MITSUMI
IC for Multifunction Telephones LAG639
Electrical Characteristics
(Except where noted otherwise, Ta=25C, V
CC
=30V)
Note:
The asterisk (
*
) indicates that the power supply voltage detection unit characteristics are standards in
the transient power on/off states. However, for convenience the detection voltage is taken to be the
value of V
0
when V
0
in measurement circuit 2 is varied and the pin 6 output state is switched from off
to on.
Item
Symbol
Measurement
Measurement conditions
Min. Typ. Max. Units
circuit
SWR unit
Output voltage
V
O
1
1
V
CC
=15~45V
4.75
5.00
5.25
V
I
L
=0~250mA
Output voltage
V
O
2
1
V
CC
=13~45V
4.70
5.00
5.25
V
I
L
=0~200mA
Output ripple voltage
Vr
1
I
L
=250mA
50
mV
P-P
Reactive current
I
CC
q
1
I
L
=0mA
6
10
mA
Amp & reception off
SWR transmission frequency
F
OSC
1
80
kHz
Output current on short-circuit
I
OS
1
R
S
=0.2
70
110
150
mA
Power supply voltage detection unit
Detection voltage
V
S
2
*
4.30
4.50
4.80
V
Detection drop voltage
V
S
2
V
S
=Vo-V
S
0.2
V
Output current while on
IR
ON
2
Vo=4V
10
20
mA
Leakage output current while off
IR
OFF
2
Vo=5.25V
1
A
Item
Symbol
Measurement
Measurement conditions
Min. Typ. Max. Units
circuit
Power amp unit
Amp gain
G
V
1
Voa=0.775Vrms
35
38
41
dB
Maximum distortion-free output
P
O
max.
1
THD=10%
150
260
mV
Distortion
THD
1
P
O
=100mW
2
%
Attenuation at 100 Hz
GF1/GF0
1
F
O
=1kHz, Fl=100Hz
-14
dB
Voa=0.775Vrms
Attenuation at 10 Hz
GF2/GF0
1
F2=10 kHz, above conditions
-8
dB
Input IMP1
R
IN
1
3
Mute off
10
15
k
Input IMP2
R
IN
2
3
Mute on
2.5
3.5
k
Mute on
Residual noise 1
Vno1
1
AUDIO IN 20mVrms
0.5
mVrms
IL=10 70mA 1.5kHz
Transmission unit ON Ft=1kHz
Mute off
Residual noise 2
Vno2
1
AUDIO OFF
1.2
mVrms
IL=10 70mA 1.5kHz
Transmission unit ON Ft=1kHz
Electrical Characteristics
(Except where noted otherwise, Ta=25C, V
CC
=30V Faudio=1kHz)
MITSUMI
IC for Multifunction Telephones LAG639
Item
Symbol
Measurement
Measurement conditions
Min. Typ. Max. Units
circuit
Beep sound generator unit
Beep sound frequency
Fb
1
0.85
1.0
1.15
kHz
Beep off switching point
Ibsw
1
Pin 9 input current
20
35
48
A
Beep sound output 1
Vob1
1
Pin 9 connected to GND through 4.7k
1.0
1.4
1.8
Vrms
Amp output voltage
Beep sound output 2
Vob2
1
Pin 9 connected to GND through 47k 0.11
0.16
0.22 Vrms
Watchdog timer unit
Timer time
Tt
1
cf. watchdog timer
0.8
1.0
1.2
S
waveform diagram
cf. watchdog timer
Output pulse width
T
PW
1
waveform diagram
0.45
1.1
mS
T=beep sound period
(1/2T)
(1T)
Output voltage while on
V
WON
1
0.5
V
Leakage output current while off
I
WOFF
1
1
A
Transmission circuit unit
Transmission output voltage
Vto
1
Both pins 27 and 28
3.8
4.2
4.6
V
P-P
Transmission waveform symmetry
Vtr
1
Vt1/Vt2
0.75
1
1.25
Reception sensitivity
Vrs
1
1.0
1.2
1.5
V
P-P
Noise resistance
Vrn
1
Level at which no errors are output
0.8
V
P-P
Input IMP
R
IN
3
3
Both pins 7and 8
25
36
46
k
Transmission delay time
Td1
1
cf. transmit/receive
0.5
S
waveform diagrams
Transmission delay time
Td2
1
cf. transmit/receive
0.4
S
waveform diagrams
Transmission delay time
Td3
1
cf. transmit/receive
1.2
S
waveform diagrams
Transmission delay time
Td4
1
cf. transmit/receive
1.5
S
waveform diagrams
Reception output H voltage
VroH
1
4
V
Reception output L voltage
VroL
1
0.5
V
Transmission waveform LOSS 1
Vtloss1
1
Vt=5V applied, power on
4.5
V
P-P
Transmission waveform LOSS 2
Vtloss2
1
Vt=5V applied, power off
4.5
V
P-P
General logic unit characteristics
H level input voltage
ViH
3
2.4
V
L level input voltage
ViL
3
0.8
V
H level input current
IiH
3
V
IN
=2.4V
10
A
L level input current
IiL
3
V
IN
=0.4V
-300
A
MITSUMI
IC for Multifunction Telephones LAG639
Watchdog timer waveform
Transmission/Reception waveform
Measuring Circuit
Tt
Tpw
TIMER CLEAR
(23PIN)
(22PIN)
Interrupt output
(20PIN)
Td1
Td3
Td2
Td4
Td2
Td1
Td4
Td3
RESET (25PIN)
(24PIN)
(28PIN)
(26PIN)
(6PIN)
(24PIN)
(27PIN)
(26PIN)
(6PIN)
Transmission
DATA IN
Reception DATA OUT
Transmission
waveform
Transmission
waveform
Measuring Cuicuit 1
MITSUMI
IC for Multifunction Telephones LAG639
Measuring Cuicuit 2
Measuring Cuicuit 3
MITSUMI
IC for Multifunction Telephones LAG639
Vo1, Vo2
-
1
Vr
-
1
No spike noise
I
CC
q
-
1
A1 only
I
OS
-
1
A2 only
G
V
, P
O
max., THD
-
1
THD measured after passing
GF1/GF0, GF2/GF0
through 400Hz-15kHz BPF
Vno1
-
1
Using 400Hz-15kHz BPF
Vno2
-
1
Using 400Hz-15kHz BPF
Fb, IbSW, Vob1, Vob2
-
1
-
-
-
1
cf. watchdog timer
Tt, T
PW
, Vwon
waveform diagram
I
WOFF
-
-
-
1
Vto, Vtr
*
1
SW5-1, 2 measured
Vrs, Vrn
-
1
Measured with Rt adjusted
Td, VroH, VroL
-
1
cf. transmit/receive
waveform diagrams
Vtloss 1
*
2
With power on, SW5-1, 2 measured
Vtloss 2
*
2
With power on, SW5-1, 2 measured
Measurement item
SW1
SW2
SW3
SW4
SW5
SW6
Other conditions
Switch Operation
(Measurement circuit 1)
Note: Circles and X's mean the switch display should be on and off respectively; dashes (-) mean either
state is allowed.
MITSUMI
IC for Multifunction Telephones LAG639
Block Diagram and Application Circuits
1. The watchdog timer time is determined by the values of Rw and Cw.
Tt .=. Rw
Cw where Rw is 56k
to 560k
Cw is between 0.01F and 10F
2. The beep sound frequency is determined by Rb and Cb.
Fb .=. 1/Rb
Cb where Rb is 56 k
to 330k
Cb is between 4700PF and 22,000PF.
3. The beep sound volume can be varied through the resistance connected to pin 10. At 4.7k
the
voltage is approx. 4V
P
-
P
, and at 47k
it is about 0.4V
P
-
P
.
4. In overload protection operation the voltage across pins 1 to 30 is tested, with a limit of 100 20mV.
On load shorting, the test voltage is dropped to about 1/4 to conserve power.
MITSUMI
IC for Multifunction Telephones LAG639
(SWR circuit not used)
Additional application example 1
Even when a 5V external voltage can be supplied, an addition voltage of 13 to 45V must be applied to
pins 3 and 4 in order to obtain an internal biased power supply of 7.4V.
(Speaker amp not used)
Additional application example 2
In order to prevent abnormal oscillation of the amplification circuit, a 5V power supply must be
connected to pin 15 to halt amplification functions.
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