Page 1
KA2425A SPEECH NETWORK WITH DIALER INTERFACE
ORDERING INFORMATION
INTRODUCTION
The KA2425A is telephone speech network integrated
circuit which includes transmit amp, receive amp,
side tone amp, DC loop interface function, DTMF input,
voltage regulator for speech, a regulated output voltage
for a dialer, and equalization circuit .
8-DIP-300A
FEATURES
• Low voltage operation (1.5v : speech)
• Transmit, receive, side tone and DTMF level are
controlled by external resistors
• Regulated voltage for dialer
• Loop length equalization
• MUTE function
• Linear interface for DTMF
PIN CONFIGURATION
MIC
1
2
TXI
TXO
STA
CC
3
4
5
KA2425A
20-SOP-375
Device Package Operating Temperature
KA2425B 18-DIP-300A
KA2425AD 20-SOP-375
MT
18
17
MS
TI
16
V
15
DD
V+
14
- 20°C ~ + 60°C
6
EQ
7
RXI
RXO
8
RMT
9 10
Fig. 1
13
12
11
LR
LC
VR
V-
Page 2
KA2425A SPEECH NETWORK WITH DIALER INTERFACE
V+
V+
ABSOLUTE MAXIMUM RATINGS
Characteristic Symbol Value Unit
V+ Voltage
VDD (V+ = 0)
MT,MS inputs
V
LR
Storage Temperature
RECOMMENDED OPERATING CONDITIONS (Ta = 25°C)
Characteristic Symbol Value Unit
I
(Instantaneous)
TXO
V+ (Voltage :Speech Mode
Tone Dialing Mode
Operating Temperature
V
V
V
V
T
T
V
C
DD
V
M
LR
STG
I
CC
+ (SM)
+(TM)
ORR
-1.0 ~ +18
-1.0 ~ +6
-1.0 ~ VDD +1
-1.0V~ V+ -3.0
-65 ~ +150
0 ~ 10
+1.5 ~ +15
+3.3 ~ +15
-20 ~ +60
V
V
V
V
°C
mA
V
V
°C
ELECTRICAL CHARACTERISTICS (T
a
Characteristic Symbol Test Conditions Min Typ Max Unit
SYSTEM SPECTIFICATIONS (Refer to Fig.3 and Fig.4)
TX Gain from VS to V
+
Gain Change
Distortion
Output Noise
R
X
V
/ V
RXO
S
RX Gain Change
Distortion
DTMF Driver
V+ / V
IN
Sidetone Level
V
/ V+
RXO
Sidetone Rejection
V
RXO
(Figure 4)}dB -
{ {
V
RXO
(Figer 3)} dB
G
V (TX)
∆G
V (TX)
THD
V
NO (TX)
G
V (RX)
∆G
V (RX)
THD
G
V (MF)
G
V (ST)
RST IL = 20mA 12 18 - dB
Tip-Ring Voltage (including polarity
guard
bridge drop of 1.4v)
V
TR
(Speech Mode)
AC impedance
Speech mode (incl. C6,See Figure 4)
Z
ac
Zac = (600)V +/ (VS - V+)
Tone Mode (including C6)
None : Typicals are tested or guaranteed.
= 25°C)
Figure (IL = 20mA)
TX
f = 1.0KHZ, IL = 20mA
(See Figure.4) IL = 60mA
RX
20mA < IL , 60mA
28
IL = 60mA
-6.0
-16
-5.0
29.5
-4.5
-
2.0
-
-15
-3.0
-
2.0
31
-3.6
-
11
-
-13
-2.0
-
IL = 20mA 3.2 4.8 6.2 dB
IL = 20mA
IL = 60mA
IL = 5.0mA
IL = 10mA
IL = 20mA
IL = 40mA
IL = 60mA
IL = 20mA
IL = 60mA
-
-28
-
-13
-
2.4
-
3.9
-
4.6
-
5.6
-
6.6
-
750
-
300
-
1650
-
-
-
-
-
-
-
-
-
-
dB
dB
%
dBmc
dB
dB
%
dB
V
DC
Ω
Page 3
KA2425A SPEECH NETWORK WITH DIALER INTERFACE
ECTRICAL CHARACTERISTICS (Continued)
Characteristic Symbol Test Conditions Min Typ Max Unit
SYSTEM AMPLIFIERS
T
X
Gain
TXO Bias Voltage
TXO Bias Voltage
TXO Bias Voltage
TXO Bias Voltage
TXI input Resistance
R
X
RXO Bias voltage
RXO Source current
RXO Source current
RXO High Voltage
RXO Low Voltage
SIDETONE AMPLIFIER
Gain (TXO to STA)
Speech Mode
Speech Mode
Pulse Mode
Pulse Mode
STA Bias Voltage V
MICROPHONE, RECEIVER CONTROLS
MIC Saturation Voltage V
MIC Leakage Current I
R
RMT Resistance
RMT Delay t
EQUALIZATION AMPLIFIER
GAIN (V + to EQ)
Speech Mode
Speech Mode
Pulse Mode
Pulse Mode
EQ Bias Voltage
Speech Mode
Pulse Mode
Speech, Pulse Mode
G
V (TX)
V
BIAS (SPM)
V
BIAS (TM)
V
OL (SPM)
V
OL (SPM)
R
I (TXI)
V
BIAS (AM)
I
SOURCE (SM)
I
SOURCE (PTM)
V
OH (AM)
V
OL (AM)
G
V (STA)
BIAS (STA)
SAT (MIC)
LKG (MIC)
RMT (SM)
R
RMT (DM)
D (RMT)
G
V (EQ)
V
BIAS (EQ)
TXI to TXO
Speech/Pulse Mode
Tone Mode
Speech/Pulse Mode
Speech/Pulse Mode
All Mode
Speech Mode
Pulse/tone Mode
All Mode
All Mode
@VLR = 0.5V
@VLR = 2.5V
@VLR = 0.2V
@VLR = 1.0V
24
0.45
VR -25
VR -25
-
-
0.45
1.5
200
VR -100
-
-
-
-
-
26
0.52
VR -5.0
VR -5.0
125
10
0.52
2.0
400
VR -50
50
-15
-21
-15
-21
28
0.60
-
-
250
-
0.60
-
-
-
150
-
-
-
-
All Modes 0.65 0.8 0.9 xV
Speech Mode,1 = 500µA
- 50 125 mV
Dialing Mode, Pin 1=3.0V - 0 5.0
Speech Mode
Dialing Mode
5.0
-
8.0
15
10
18
Dialing to Speech 2.0 4.0 20 ms
@ VLR = 0.5V
@ VLR = 2.5V
@ VLR = 0.2V
@ VLR = 1.0V
@ VLR = 0.5V
@ VLR = 0.5V
@ VLR = 2.5V
-
-12
-
-2.5
-
-12
-
-2.5
-
0.66
-
1.3
-
3.3
-
-
-
-
-
-
-
dB
xV
mV
mV
mV
KΩ
xV
mA
µA
mV
mV
dB
µA
Ω
KΩ
dB
V
R
R
R
dc
Page 4
KA2425A SPEECH NETWORK WITH DIALER INTERFACE
ELECTRICAL CHARACTERISTICS (Continued)
Characteristic Symbol Test Conditions Min Typ Max Unit
DIALING INTERFACE
MT Input Resistance R
MT Input High Voltage V
MT Input Low Voltage V
MS Input Resistance R
MS Input High Voltage V
MS Input Low Voltage
V
TI Input Resistance
DTMF Gain G
LINE INTERFACE
V+ Current (Pin 12 Grounded)
Speech Mode
Speech/Pulse Modes
Tone Mode
V+ Voltage
Speech/Pulse Mode
Speech/Pulse Mode
Speech/Pulse Mode
Tone Mode
Tone Mode
LR Level Shift
Speech/Pulse Mode
∆ V
Tone Mode
LC Terminal Resistance R
VOLTAGE REGULATORS
VR Voltage
Load Regulation
Line Regulation
V
Voltage
DD
Load Regulation (Dialing Mode)
Line Regulation (All Modes)
Max. Output Current
Max. Output Current
VDD Leakage Current
∆ V
∆ V
I
OSM (MAX)
I
ODM (MAX)
I
LKG (VDD)
1 (MT)
IH (MT)
IL (MT)
I (MS)
IH (MS)
IL MS)
R
I (T1)
V (MF)
1+ V+ = 1.7V
V+
LR
LC
V
R
∆ V
O
∆ V
O
V
DD
O (DM)
O (AM)
- 50 100 -
- VDD-0.3 - - V
- - - 1.0 V
- 280 600 -
- 2.0 - - V
-
-
-
-
-
1.25
0.3
- 3.2 4.8 6.2 dB
V+ = 12V
V+ = 12V
IL = 20mA
IL = 30mA
IL = 120mA
IL = 20mA
IL = 30mA
V + -V
LR
4.5
5.5
6.0
2.6
3.0
7.0
4.1
4.5
7.1
8.4
8.8
3.2
3.7
8.2
4.9
6.4
-
2.7
-
4.3
9.0
12.5
14.0
3.8
4.4
9.5
5.7
6.2
- 36 57 94
(V+ = 1.7V)
0mA < IR < 1.6mA
2.0V < V + < 6.5V
(V+ = 4.5V)
0 < IDD < 1.6mA
4.0V < V + < 9.0V
Speech Mode
Dialing Mode
1.1
3.0
375
1.6
1.2
-
-
3.3
-
0.25
550
2.0
1.3
20
25
3.8
50
1000
3.6
V + = 0, VDD = 3.0V - - 1.5
KΩ
dc
dc
KΩ
dc
V
dc
-
KΩ
mA
V
dc
-
V
dc
KΩ
V
dc
-
mV
-
mV
V
dd
-
V
dd
-
mV
µA
mA
µA
Page 5
KA2425A SPEECH NETWORK WITH DIALER INTERFACE
TEST CIRCUIT
V+
14 13 12
47Ω
+
20µF
I
47Ω
600Ω
12
10
LOOP
10
204
503
150Ω
22K
16
V
IN
400mVrms
KA2425A
18 17 10
1.0V
Fig 2. DTMF Driver Test
150K
8.2K
4 7 8
2
6
14 15 17
+
I
LOOP
503
KA2425A
20µF
600Ω
33K
203
150
3 11
18 13
20mVrms
1KHz
V+
10K
Vs
Microphone Equivalent
204
Ω
Fig 3. Transmit and sidetone level test
20mVrms
1KHz
150K
8.2K
4 7 8
2
6
14 15 17
20µF
+
203
Vs
503
KA2425A
I
LOOP
33K
3 11
18 13
12
10
47Ω
10
150Ω
204
V+
Fig 4. AC Impedance, Receive and Sidetone Rejection Test
503
Page 6
KA2425A SPEECH NETWORK WITH DIALER INTERFACE
APPLICATION CIRCUIT
H/S SW
TIP
8.2K
223
1
2
200Ω
3
7
8
9
102
2.2K
47µF
472
MIC
+
SPEAKER
RING
- +
102
103
383 383
393
220K
4.7K 3.3K
68Ω, 1/2
33µF
+
+
22µF
14
6
4
15
KA2425A
13
12
11
10
120K
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