Datasheet LAG639D Datasheet (MITSMI)

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 5V±0.25 IL 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 8Ω 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=25°C, VCC=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 V0 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

O11

V

CC=15~45V

4.75 5.00 5.25 V

I

L=0~250mA

Output voltage V

O21

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 ICCq1

I

L=0mA

610mA

Amp & reception off

SWR transmission frequency F

OSC 180kHz

Output current on short-circuit I

OS 1RS=0.2Ω 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 2VS=Vo

-

VS 0.2 V

Output current while on IR

ON 2 Vo=4V 10 20 mA

Leakage output current while off

IROFF 2 Vo=5.25V 1 µA

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

PO 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

-

8dB

Input IMP1 R

IN1 3 Mute off 10 15 kΩ

Input IMP2 R

IN2 3 Mute on 2.5 3.5 kΩ

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=25°C, VCC=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 µA

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

IWOFF 11µA

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 RIN3 3 Both pins 7and 8 25 36 46 kΩ

Transmission delay time Td1 1

cf. transmit/receive

0.5 µS

waveform diagrams

Transmission delay time Td2 1

cf. transmit/receive

0.4 µS

waveform diagrams

Transmission delay time Td3 1

cf. transmit/receive

1.2 µS

waveform diagrams

Transmission delay time Td4 1

cf. transmit/receive

1.5 µS

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 µA

L level input current IiL 3 V

IN=0.4V

-

300 µA

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

Td2Td1

Td4Td3

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

CCq

-

1 A1 only

I

OS

-

1 A2 only

G

V, PO 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 56kΩ to 560kΩ

Cw is between 0.01µF and 10µF

2. The beep sound frequency is determined by Rb and Cb.
Fb .=.1/Rb

•Cb where Rb is 56 kΩ to 330kΩ

Cb is between 4700PF and 22,000PF.

3. The beep sound volume can be varied through the resistance connected to pin 10. At 4.7kΩ the

voltage is approx. 4V

P-P, and at 47kΩ it is about 0.4VP-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.