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| TECHNICAL DATA Universal Speech Circuit with Dialler Interface The IL3726AN is a low voltage speech network which includes Mic amp. transmit amp, receive amp. and stabilized DC-supply 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. IL3726AN ORDERING INFORMATION IL3726AN TA = -40 to 70 C * * * * * * * * Uses a minimum of external components (7 Capacitors & 11 Resistors) Low Voltage Operating Symmetrical inputs for microphones, provided good balance to ground DTMF signal input with confidence tone Mute input for DTMF dialling Line loss compensation (line current dependent) for microphone and earpiece amplifiers Gain control curve adaptable to exchange supply DC line voltage adjustment facility BLOCK DIAGRAM 7 8 DC 9 6 1 4 12 13 17 18 10 5 3 11 2 15 14 16 1 IL3726A PIN DESCRIPTION PIN CONFIGURATION Pin No Designation Description Positive power line and transmit amplifier output. Transmit amplifier output. The resistor which is connected this pin to V - sets the DC resistance of circuit. The value of resistor is suitable for 47 to 100. Transmit amplifier input. Input impedance is 17k 20%. Positive power supply pin for internal circuitry. This pin will be connected to a decoupling capacitor 47F - 100F. Mute input : Active low . Gain regulation control input Sense input to the DC supply Output from the DC supply Control output from the DC supply Dual-tone Multi-Frequency Input Microphone a ifier output. Microphone amplifier inputs. Input impedance is 1.7k 20% Negative power line Receive amplifier input. . Input impedance is ~38k 20% Receive amplifier driving capability control input Receive amplifier output. Output impedance is 3(Typ). 1 2 V+ TXO TXI VDD MUTE GR DCS DCO DCC DTMF 1 2 V+ RXO1 18 17 16 15 14 13 12 11 10 1TXO TXI VDD Mute RXO2 3 4 5 6 7 DR 3 4 5 6 7 8 9 10 11 RXI VMIC2 GR DCS DCO MIC1 8 9 MICO DCC DTMF MIC0 MIC1, MIC2 V RXI DR 12, 13 14 15 16 17, 18 RXO1, RXO2 MAXIMUM RATINGS Symbol Parameter VLN Positive line voltage, tp = 2s Iline Line current continious Tstg Storage temperature TJ Operating temperature range No input should be set on higher level than pin4 Min 0 0 -55 -40 Max 18 130 +125 +70 Unit V mA C C ELECTRICAL CHARACTERISTICS (Tamb = 25C) 2 IL3726A Characteristic Line Voltage TX Gain Symbol VLN GV (TX) RL = 0 RL = 400 RL = 900 - 2.2 k RL = 0 - 900 , 1 kHz 200Hz to 3400 Hz 200Hz to 3400 Hz, IL = 20 - 100 mA 200Hz to 3.4 kHz, IL = 0 - 100mA 1.5 3 41 43.5 46 3 43 45.5 48 5 45 47.5 50 7 1 dB dB dB Vp-p Vp-p Test Conditions IL = 15mA IL = 100mA Min. 3.3 11.0 Typ. 3.7 13.0 Max. 4.1 15.0 Unit V TX Range of Regulation TX Frequency Response TX Dynamic Output Voltage TX Max Output Voltage GTX GTX(RE S) VO(TX) VOTX(M AX) TX Input Impedance Mute Input Voltage RX Gain ZI (TX) VI (MUTE) GV (RX) 1 kHz 13.5 17 20.5 0.3 k V dB RX Range of Regulation GRX GRX(RE S) VO(RX) VORX(M AX) ZO(RX) ZI (Mic) RL = 0 RL = 400 RL = 900 - 2.2 k RL =0 - 900, 1 kHz 200 Hz - 3400 Hz -18.5 -16 -13.5 3 -16.5 -14 -11.5 5 -14.5 -12 -9.5 7 dB RX Frequency Response -1 1 dB RX Dynamic Output Voltage RX Max Output Voltage RX output impedance Microphone input impedance Transmitter output noise Receiver output noise DC supply voltage 200 Hz - 3400 Hz IL = 20 - 100 mA 200 Hz - 3400 Hz IL = 0 - 100mA 1 kHz 1 kHz 0.5 0.9 3 1.7 -75 - 85 Vp-p Vp-p k dB dB 2.6 2.45 28.5 30 V V mA dB k IL = 21 - 100 mA IDC = 0 mA IDC = 2 mA 2.1 1.95 2 24.5 20 2.35 2.2 26.5 25 DC supply current DTMF transmitting gain DTMF input impedance 3 IL3726A PACKAGE DIMENSIONS N SUFFIX PLASTIC (MS - 001AC) A 18 10 B 1 9 F L C -T- SEATING N G D 0.25 (0.010) M T K PLANE M H J Dimensions, mm Symbol A B NOTES: 1. Dimensions "A", "B" do not include mold flash or protrusions. Maximum mold flash or protrusions 0.25 mm (0.010) per side. C D F G H J K L M N 0 2.92 7.62 0.20 0.38 0.36 1.14 2.54 7.62 10 3.81 8.26 0.36 MIN 22.35 6.10 MAX 23.37 7.11 5.33 0.56 1.78 4 4 |
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