TECHNICAL DATA IL3726AN 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. • • • • • • • • 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 9 6 1 4 DC 12 17 13 18 10 5 3 11 2 15 14 16 1 IL3726A PIN DESCRIPTION Pin No PIN CONFIGURATION Designation Description 1 V+ 2 TXO 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 47 F - 100 F. 3 TXI 4 VDD 5 MUTE Mute input : Active low . 6 GR Gain regulation control input 7 DCS Sense input to the DC supply 8 DCO Output from the DC supply 9 DCC Control output from the DC supply 10 DTMF Dual-tone Multi-Frequency Input 11 MIC0 Microphone a ifier output. 12, 13 MIC1, MIC2 V Negative power line 15 RXI Receive amplifier input. . Input impedance is ~38k 20% 16 DR Receive amplifier driving capability control input RXO1, RXO2 2 V+ RXO1 18 1TXO RXO2 17 3 TXI DR 16 4 VDD RXI 15 5 Mute V- 14 6 GR MIC2 13 7 DCS MIC1 12 8 DCO MICO 11 9 DCC DTMF 10 Microphone amplifier inputs. Input impedance is 1.7k 20% 14 17, 18 1 Receive amplifier output. Output impedance is 3 (Typ). 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 = 25 C) 2 IL3726A Characteristic Symbol Test Conditions Min. Typ. Max. Unit Line Voltage VLN IL = 15mA IL = 100mA 3.3 11.0 3.7 13.0 4.1 15.0 V TX Gain GV (TX) RL = 0 RL = 400 RL = 900 – 2.2 k RL = 0 - 900 , 1 kHz 41 43.5 46 3 45 47.5 50 7 dB dB ±1 dB 43 45.5 48 5 TX Range of Regulation ∆GTX TX Frequency Response ∆GTX(RE S) VO(TX) 200Hz to 3400 Hz 200Hz to 3400 Hz, IL = 20 – 100 mA 1.5 Vp-p TX Max Output Voltage VOTX(M AX) 200Hz to 3.4 kHz, IL = 0 - 100mA 3 Vp-p TX Input Impedance ZI (TX) 1 kHz Mute Input Voltage RX Gain VI (MUTE) GV (RX) RX Range of Regulation ∆GRX RX Frequency Response ∆GRX(RE S) 200 Hz – 3400 Hz RX Dynamic Output Voltage VO(RX) 200 Hz – 3400 Hz IL = 20 – 100 mA 0.5 Vp-p RX Max Output Voltage VORX(M AX) 200 Hz – 3400 Hz IL = 0 - 100mA 0.9 Vp-p RX output impedance Microphone input impedance ZO(RX) ZI (Mic) 1 kHz 1 kHz 3 1.7 Ω kΩ -75 - 85 dB dB TX Dynamic Output Voltage Transmitter output noise Receiver output noise DC supply voltage DC supply current DTMF transmitting gain DTMF input impedance z RL = 0Ω RL = 400Ω RL = 900Ω - 2.2 kΩ RL =0 - 900Ω, 1 kHz IL = 21 – 100 mA IDC = 0 mA IDC = 2 mA 13.5 -18.5 -16 -13.5 3 17 -16.5 -14 -11.5 5 -1 20.5 kΩ 0.3 V -14.5 -12 -9.5 7 dB 1 dB dB 2.1 1.95 2.35 2.2 2.6 2.45 V V 2 24.5 20 26.5 25 28.5 30 mA dB kΩ 3 IL3726A PACKAGE DIMENSIONS N SUFFIX PLASTIC (MS – 001AC) A 18 10 B 1 9 F L C -T- SEATING PLANE N G K M D H J 0.25 (0.010) M T Dimensions, mm NOTES: 1. Dimensions “A”, “B” do not include mold flash or protrusions. Maximum mold flash or protrusions 0.25 mm (0.010) per side. Symbol MIN MAX A 22.35 23.37 B 6.10 7.11 C 5.33 D 0.36 0.56 F 1.14 1.78 G 2.54 H 7.62 J 0° 10° K 2.92 3.81 L 7.62 8.26 M 0.20 0.36 N 0.38 4 4