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| KA8503 LOW VOLTAGE SPEECH NETWORK INTRODUCTION The KA8503 is a telephone low voltage speech network which includes mic amp. transmit amp, side-tone amp, receive amp. It handles the voice signal performing the 2/4 wire interface and changing the gain on both sending and receiving amplifiers to compensate for line attenuation by sensing the line length through the line current. Application dependent parameters such as amplitude of each amp, sidetone level line balance, and frequency response are controlled by external components. Each gain can be controlled by external component exchange. The receiver output driving capability is adjustable. 18-DIP-300A www..com FEATURES * Adjust Sending and Receiving Attenuation Length * Mute Function * Side Tone Balance Network Constitution * Low Voltage Operating * AC Impedance Matching * Uses in Inexpensive Components (5 Capacitors & 10 Resistors) * Uses a minimum of external components ORDERING INFORMATION Device KA8503 Package 18-DIP-300A Operating Temperature - 40C ~ + 70C BLOCK DIAGRAM VDD MUTE V+ ST3 STO RXI 4 5 1 9 10 15 MIC 1 MIC 2 12 13 17 18 RXO2 RXO3 6 11 3 2 T XO 8 ST2 7 ST1 14 16 VRXO1 GR MICO TXI Fig. 1 KA8503 LOW VOLTAGE SPEECH NETWORK PIN CONFIGURATION V+ 1 2 3 4 5 6 7 8 9 KA8503 18 17 16 15 14 13 12 11 10 RXO3 TXO RXO2 TXI RXO1 VDD RXI www..com MUTE V- GR MIC2 ST1 MIC1 ST2 MIC0 ST3 ST0 Fig. 2 PIN DESCRIPTION Pin No 1 2 3 4 5 6 7, 8, 9 10 11 12, 13 14 15 16 17, 18 Symbol V+ TXO TXI VDD MUTE GR ST1, ST2, ST3 STO MIC0 MIC1, MIC2 VRXI RXO1 RXO2, ROX3 Seperate amplifier output. Microphone amplifier output. Microphone amplifier inputs. Input impedance is 1.7 K Negative power line. Receive amplifier input. Receive amplifier output. Receive amplifier output. Output impedance is 3(Typ) 20% Description Postive power line and transmit amplifier output. Transmit amplifier output. The resistor which is connected this pin to V - sets DC resistance of the circuit. The value of resistor is suitable for 47 ~ 100. Transmit amplifier input. Input impedance is 17K 20% DC power supply pin. This pin will be connected to a decoupling capacitor 47F~ 100 F. Mute active high input. Gain regulation control input. Input impedance is 5.5 K Seperate amplifier control inputs. 20%. KA8503 LOW VOLTAGE SPEECH NETWORK ABSOLUTE MAXIMUM RATINGS Characteristic Line Voltage (3ms max) Forward Line Current Reverse Line Current Power Dissipation (Ta = 70C) Operating Temperature Storage Temperature Symbol VL ILF ILR PD T OPR T STG Value 22 150 -150 1 - 40 ~ + 70 - 55 ~ + 125 Unit V mA mA W C C www..com ELECTRICAL CHARACTERISTICS (Refer to the test circuits, IL = 15 ~ 100mA, f = 200 ~ 3.4KHz, Ta = 25C, unless otherwise specified) Characteristic Line Voltage Symbol VL GV (TX) GTX GTX (RES) VMI = 5mV f = 1KHz Test Conditions IL = 15mA IL = 100mA IL = 20mA IL = 38.5mA IL = 55mA Test Fig Min 3.3 11 46 43.5 41 3 0.1 -13.5 -16 -18.5 3 0.3 0.3 0.3 0.3 Typ 3.7 13 48 45.5 43 5 1.5 1.5 1.5 1.5 1.7 -11.5 -14 -16.5 5 0.5 0.5 0.5 0.5 0.9 0.9 Max 4.1 15 50 47.5 45 7 1 1 1 1 -9.5 -12 -14.5 7 1 1 1 1 Unit V dB dB T X Gain T X Range of Regulation 4 T X Frequency Response T X Dynamic Output Voltage T X Max Output Voltage T X Input Impedance Mute Input Current RX Gain RX Range of Regulation RX Frequency Response VO (TX) VOTX (MAX) ZI (TX) II (MUTE) GV (RX) GRX GRX (RES) RX Dynamic Output Voltage VO (RX) RX Max Output Voltage VORX (MAX) GTX = GTX1 - GTX3 VMI = 5mV f = 200Hz IL = 20mA f = 3.4KHz VMI = 5mV f = 200Hz IL = 80mA f = 3.4KHz IL = 20mA, f = 200Hz ~ 3.4KHz IL = 100mA, f = 200Hz ~ 3.4KHz IL = 20mA, f = 200Hz ~ 3.4KHz IL = 100mA, f = 200Hz ~ 3.4KHz IL = 20mA, f = 200Hz ~ 3.4KHz IL = 20mA IM = 0.1mA IL = 20mA VRI = 0.5V IL = 38.5mA f = 1KHz IL = 55mA GRX = GRX1 - GRX3 VRI = 0.5V f = 200Hz IL = 20mA f = 3.4KHz VRI = 0.5V f = 200Hz IL = 80mA f = 3.4KHz f = 200Hz IL = 20mA f = 3.4KHz f = 200Hz IL = 100mA f = 3.4KHz IL = 20mA f = 200Hz VRI = 10V f = 3.4KHz 4 4 4 4 dB Vp-p Vp-p K mA dB dB 5 5 dB 5 Vp-p 5 Vp-p KA8503 LOW VOLTAGE SPEECH NETWORK TEST CIRCUIT A IL + Line 62K 6.2K 47uF 1.5M 12K 910 Mute 470uF 470uF 62K 300 20uF www..com SW2 15 17 10 9 1 4 5 12 C 1.7K SW3 350 310 KA8503 18 16 14 7 8 3.6K 104 18K 1.5M 13 2 3 11 6 SW1 VM1 560 D 600 10 820 47uF VRI 22uF - Line 9.1K 75 27K 1.5M Fig. 3 C *sw1 : y *sw2 : ON *sw3 : y A E KA8503 V RO F B 560 470uF V SO VM I D G *Side tone = 20 Log Fig. 4 VRO VMI * GV(TX) = 20 Log VSO VMI C *sw1: OFF *sw2: ON *sw3: x D G A E KA8503 F B V RO 470uF 560 VRI *GV (RX) = 20 Log VSO VRI Fig. 5 |
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