Samsung KA8501A Datasheet

KA8501A SPEECH NETWORK WITH DIALER INTERFACE

ORDERING INFORMATION

INTRODUCTION

The KA8501A is a telephone speech network in­tegrated circuit which includes transmit amp, receive
amp, DTMF amp, voltage regulator, line equalizer,
voltage comparator. It handles the voice signal, perfor­ming the 2/4 wires interface and changing the gain on
both sending and receiving amplifiers to compensate
the line current. The KA8501A can work in fixed gain
mode.

FEATURES

• Adjusts sending and receiving attenuation length

• Regulated voltage for dialer

• Linear interface for DTMF

• Suitable for ceramic transducers

• Mute function

PIN CONFIGURATION

MIC1

16-DIP-300A

Device Package Operating Temperature

KA8501A 16-DIP-300A

1

16

MIC2

- 45°C ~ + 70°C

V +

MUTING

BIAS ADJ.

2

3

4

15

14

13

V

DD

MF

RXO2

KA8501A

REGULATOR

Fig. 1

REGULATOR

LINE CURRENT

Z

SWITCH

BAL

5

6

7

8 9

12

11

10

RXO1

RXI +

RXI -

V -

KA8501A SPEECH NETWORK WITH DIALER INTERFACE

f = 1KHz

ABSOLUTE MAXIMUM RATINGS

Characteristic Symbol Value Unit

Line Voltage (3msec max)
Forward Line Current
Reverse Line Current
Power Dissipation (Ta = 70°C)
Operating Temperature
Storage Temperature

V

L

I

LF

I

LR

P

D

T

OPR

T

STG

22

150

-150
1

- 45 ~ + 70

- 65 ~ + 150

V
mA
mA

W

°C
°C

ELECTRICAL CHARACTERISTICS (Ta = 25°C)

Characteristic Symbol Test Conditions Min Typ Max Unit

IL = 12mA 3.9 - 4.7

Line Voltage V

Ta = 25°C

L

Common Mode Rejection Ratio CMRR f = 1KHz, IL = 12 ~ 80mA 50 - - dB
Line Matching Impedance Z

VRI = 0.3V, IL = 12 ~ 80mA

L

f = 1KHz
Ta = 25°C

TX Gain G

V (TX) I

f = 1KHz
VMI = 2mV

IL = 25 ~ 52mA 48 49 50

TX Gain Flatness

TX Distortion

TX Noise V
Side Tone G

MIC Input Impedance Z

Tx Loss in MF Operation

G

∆ G

THD

NO (TX)

V (ST)

I (MIC)

V (LOSS)

V (TX)

VMI = 2mV, f
IL = 12 ~ 80mA
f = 1KHz VSO = 1V - - 2

TX

IL = 16 ~ 80mA VSO = 1.3V - - 10
VMI = 0V, IL = 40mA - - -70 dBmp
Ta = 25°C, f= 1KHz
IL = 25 ~ 52mA
VMI = 2mV, IL = 12 ~ 80mA 40 - -

VMI = 2mV

Ta = 25°C

RX Gain G

V (RX)

VRI = 0.3V

IL = 25 ~ 52mA 7 8 9

IL = 20mA - - 5.5 V
IL = 80mA - - 12.2

500 600 700

= 1KHz

ref

IL = 25mA

= 52mA

L

48 49 50
44 45 46

- -

- -

IL = 25mA - 30 - ­IL = 52mA - 30 - ­IL = 25mA

IL = 52mA

7 8 9

2.5 3.5 4.5

± 1

36 dB

Ω

dB

dB

%

KΩ

dB

dB