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KA2425A
INTRODUCTION
SPEECH NETWORK WITH DIALER INTERFACE
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 20-SOP-375
ORDERING INFORMATION
Device KA2425B KA2425AD Package 18-DIP-300A 20-SOP-375 Operating Temperature - 20C ~ + 60C
PIN CONFIGURATION
MIC
1 2 3 4 5 6 7 8 9
Fig. 1
18 17 16 15 KA2425A 14 13 12 11 10
MT
TXI
MS
TXO
TI
STA
VDD
CC
V+
EQ
LR
RXI
LC
RXO
VR
RMT
V-
KA2425A
SPEECH NETWORK WITH DIALER INTERFACE
ABSOLUTE MAXIMUM RATINGS
Characteristic V+ Voltage VDD (V+ = 0) MT,MS inputs VLR Storage Temperature Symbol VC VDD VM VLR T STG Value -1.0 ~ +18 -1.0 ~ +6 -1.0 ~ VDD +1 -1.0V~ V+ -3.0 -65 ~ +150 (Ta = 25C) Value 0 ~ 10 +1.5 ~ +15 +3.3 ~ +15 -20 ~ +60 Unit mA V V C Unit V V V V C
RECOMMENDED OPERATING CONDITIONS
Characteristic ITXO (Instantaneous) V+ (Voltage :Speech Mode Tone Dialing Mode Operating Temperature Symbol ICC V+ (SM) V+(TM) T ORR (T a = 25C)
ELECTRICAL CHARACTERISTICS
Characteristic T X Gain from VS to V+ Gain Change Distortion Output Noise RX VRXO / VS RX Gain Change Distortion DTMF Driver V+ / VIN Sidetone Level VRXO / V+
Sidetone Rejection VRXO { (Figure 4)}dB - { VRXO
Symbol GV (TX) GV (TX) THD TX VNO (TX) GV (RX) GV (RX) THD RX GV (MF) GV (ST)
Test Conditions
Min 28
Typ 29.5 -4.5 2.0 11 -15 -3.0 2.0 4.8 -28 -13 18
Max 31 -3.6 -13 -2.0 6.2 -
Unit dB dB % dBmc dB dB % dB dB
SYSTEM SPECTIFICATIONS (Refer to Fig.3 and Fig.4) Figure (IL = 20mA) IL = 60mA -6.0 f = 1.0KHZ, IL = 20mA (See Figure.4) IL = 60mA -16 -5.0 IL = 20mA IL = 20mA IL = 60mA IL = 20mA 3.2 12
RST
(Figer 3)} dB
dB
V+
V+
IL = 5.0mA Tip-Ring Voltage (including polarity guard bridge drop of 1.4v) (Speech Mode) AC impedance Speech mode (incl. C6,See Figure 4) Zac = (600)V +/ (VS - V+) Tone Mode (including C6) None : Typicals are tested or guaranteed. Zac IL = 20mA IL = 60mA 20mA < IL , 60mA IL = 10mA VTR IL = 20mA IL = 40mA IL = 60mA
-
2.4 3.9 4.6 5.6 6.6
VDC
-
750 300 1650
KA2425A
SPEECH NETWORK WITH DIALER INTERFACE
(Continued) Symbol Test Conditions Min Typ Max Unit
ECTRICAL CHARACTERISTICS
Characteristic SYSTEM AMPLIFIERS TX Gain TXO Bias Voltage TXO Bias Voltage TXO Bias Voltage TXO Bias Voltage TXI input Resistance RX 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 MICROPHONE, RECEIVER CONTROLS MIC Saturation Voltage MIC Leakage Current RMT Resistance RMT Delay EQUALIZATION AMPLIFIER GAIN (V + to EQ) Speech Mode Speech Mode Pulse Mode Pulse Mode EQ Bias Voltage Speech Mode Pulse Mode Speech, Pulse Mode
GV (TX) VBIAS (SPM) VBIAS (TM) VOL (SPM) VOL (SPM) RI (TXI) VBIAS (AM) ISOURCE (SM) ISOURCE (PTM) VOH (AM) VOL (AM)
TXI to TXO Speech/Pulse Mode Tone Mode Speech/Pulse Mode Speech/Pulse Mode
24 0.45 VR -25 VR -25 -
26 0.52 VR -5.0 VR -5.0 125 10
28 0.60 250 -
dB xVR mV mV mV K xVR mA A mV mV
All Mode Speech Mode Pulse/tone Mode All Mode All Mode
0.45 1.5 200 VR -100 -
0.52 2.0 400 VR -50 50
0.60 150
GV (STA)
@VLR = 0.5V @VLR = 2.5V @VLR = 0.2V @VLR = 1.0V
0.65
-15 -21 -15 -21 0.8
0.9 xVR dB
VBIAS (STA)
All Modes
VSAT (MIC) ILKG (MIC) RRMT (SM) RRMT (DM) tD (RMT)
Speech Mode,1 = 500A Dialing Mode, Pin 1=3.0V Speech Mode Dialing Mode Dialing to Speech
5.0 2.0
50 0 8.0 10 4.0
125 5.0 15 18 20
mV A K ms
@ VLR = 0.5V GV (EQ) @ VLR = 2.5V @ VLR = 0.2V @ VLR = 1.0V VBIAS (EQ) @ VLR = 0.5V @ VLR = 0.5V @ VLR = 2.5V
-
-12 -2.5 -12 -2.5 0.66 1.3 3.3
Vdc dB
KA2425A
SPEECH NETWORK WITH DIALER INTERFACE
(Continued) Test Conditions Min Typ Max Unit
ELECTRICAL CHARACTERISTICS
Characteristic DIALING INTERFACE MT Input Resistance MT Input High Voltage MT Input Low Voltage MS Input Resistance MS Input High Voltage MS Input Low Voltage TI Input Resistance DTMF Gain 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 Tone Mode LC Terminal Resistance VOLTAGE REGULATORS VR Voltage Load Regulation Line Regulation VDD Voltage Load Regulation (Dialing Mode) Line Regulation (All Modes) Max. Output Max. Output Current Current
Symbol
R1 (MT) VIH (MT) VIL (MT) RI (MS) VIH (MS) VIL MS) RI (T1) GV (MF)
-
50 VDD-0.3 280 2.0 3.2
100 600 1.25 4.8
1.0 0.3 6.2
K Vdc Vdc K Vdc Vdc K dB
1+
V+ = 1.7V V+ = 12V V+ = 12V IL = 20mA
4.5 5.5 6.0 2.6 3.0 7.0 4.1 4.5 36
7.1 8.4 8.8 3.2 3.7 8.2 4.9 6.4 2.7 4.3 57
9.0 12.5 14.0 3.8 4.4 9.5 5.7 6.2 94 K Vdc Vdc mA
V+
IL = 30mA IL = 120mA IL = 20mA IL = 30mA
VLR RLC
V + -VLR -
VR VO VO VDD VO (DM) VO (AM) IOSM (MAX) IODM (MAX) ILKG (VDD)
(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 V + = 0, VDD = 3.0V
1.1 3.0 375 1.6 -
1.2 20 25 3.3 0.25 50 550 2.0 -
1.3 3.8 1000 3.6 1.5
Vdc mV mV Vdd Vdd mV A mA A
VDD Leakage Current
KA2425A
TEST
V+
SPEECH NETWORK WITH DIALER INTERFACE
CIRCUIT
14 22K 16 VIN 18
13
12 +
KA2425A
17 10 204 47
20F 600 ILOOP
400mVrms 1.0V
Fig 2. DTMF
150K V+ 503 8.2K 33K 4 2 10K 6
20mVrms 1KHz
Driver
Test
150 8 3 11 12 10 10
7
KA2425A
14
15
17
18
13
Vs ILOOP
Microphone Equivalent
+ 20F 203 600
47
204
150 503
Fig 3. Transmit and sidetone level test
150K V+ 503 8.2K 33K 4 2 6 14 15 17 18 13 7 8 3 11 12 10 10
KA2425A
20F +
20mVrms 1KHz
47 203 ILOOP 204
150 503
Vs
Fig 4. AC
Impedance, Receive and Sidetone Rejection Test
KA2425A
APPLICATION
TIP H/S SW
SPEECH NETWORK WITH DIALER INTERFACE
CIRCUIT
8.2K
RING
+
14 103 220K 223 6 3.3K 4 2 200 15 3 2.2K 1 102 MIC
4.7K
KA2425A
68, 1/2 13 33F 7 47F 12 8
+
393
+
SPEAKER
11 10 120K
9
+
102 383 383 22F 472

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