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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 -
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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
Page 3
KA8501A SPEECH NETWORK WITH DIALER INTERFACE
ELECTRICAL CHARACTERISTICS (Continued)
Characteristic Symbol Test Conditions Min Typ Max Unit
RX Gain Flatness
RX Distortion
RX Noise V
RX Output Impedance R
MF Supply Voltage V
MF Supply Current
Stand by I
Operation I
MF Amplifier Gain G
∆ G
THD
NO (RX)
O (RX)
DD (MF)
SB (MF)
DD (MF)
V (MF)
DC Input Voltage Level (pin 14) V
Input Impedance (pin 14) Z
Distortion THD
Starting Delay Time t
Muting Threshold Voltage (pin 3)
Muting Current
Stand by I
Operation I
D (ST)
V
TH(MUTE)
SB (MUTE)
DD (MUTE)
V (RX)
I (MF)
I (MF)
VRI = 0.3V, f
IL = 12 ~ 80mA
f = 12mA VRO = 1.9V - - 10
RX
1KHz IL = VRO = 1.8V - - 2
VRI = 0V, IL = 12 ~ 80mA - - 100
V
= 50mV, IL = 40mA - - 100
RO
IL = 12 ~ 80mA 2.4 2.5 - V
IL = 12 ~ 80mA
IL = 12 ~ 80mA
fMF = 1KHz
VMF = 80mV
VMF = 80mV - 0.3V
VMF = 80mV 40 - -
VMF = 110mV
MF
IL = 12 ~ 80mA
IL = 12 ~ 80mA - - 5 mS
IL = 12 ~ 80mA - - -10
IL = 12 ~ 80mA - - +10
= 1KHz
ref
- -
± 1
IL = VRO = 1.6V - - 2
50mA VRO = 2.1V - - 10
0.5 - 2 - -
15 - 17 dB
- V
DD
- -
- - 1
1.6 - -
dB
%
µV
Ω
mA
KΩ
2 %
V
µA
Page 4
KA8501A SPEECH NETWORK WITH DIALER INTERFACE
p
g
APPLICATION CIRCUIT
5K
13K
4
9
10uF 30
1K
7.5K
8
10
330
5
7
AGC
6
68
11
to Dialer
MUTE MF Signal
Reg.
Tx Amp
Rx Amp
Output
Amp
3
1415
MF Amp
Mic Amp
16
1
3.6K
SPEAKER
Io
13
12
1.8K
1.8K
1uF
2
MIC
_
15V
+
Rin
Ti
Fig. 2
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