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| ILA1062/ILA1062A TELEPHONE SPEECH NETWORK WITH DIALER INTERFACE DESCRIPTION The ILA1062 and ILA1062A are integrated circuits that perform all speech and line interface functions required in fully electronic telephone sets. They perform electronic switching between dialing and speech. The ICs operates at line voltage down to 1.6 V DC (with reduced performance) to facilitate the use of more telephone sets connected in parallel. All statements and values refer to all versions unless otherwise specified. The ILA1062(ILA1062A) is packaged in a standard 16-pin plastic DIP and special plastic DIP with internal heatsink is also available. FEATURES Low DC line voltage; operates down to 1.6V (excluding polarity guard) * Voltage regulator with adjustable static resistance * Provides a supply for external circuits * Symmetrical high-impedance inputs (64 k) for dynamic, magnetic or piezo-electric microphones * Asymmetrical high-impedance input (32 k) for electret microphones * DTMF signal input with confidence tone * Mute input for pulse or DTMF dialing - ILA1062: active HIGH (MUTE) - ILA1062A: active LOW (MUTE) * Receiving amplifier for dynamic, magnetic or piezo-electric earpieces * Large gain setting range on microphone and earpiece amplifiers * Line loss compensation (line current dependent) for microphone and earpiece amplifiers * Gain control curve adaptable to exchange supply * DC line voltage adjustment facility * LN 1 PIN CONNECTION 16 15 14 13 12 11 10 9 SLPE AGC REG VCC MUTE DTMF IR VEE GAS1 2 GAS2 OR GAR MICMIC+ STAB 3 4 5 6 7 8 ILA1062A BT1062A 1 ILA1062/ILA1062A QUICK REFERENCE DATA Characteristic Line Voltage Operating Line Current Normal Operation with Reduced Performance Internal Supply Current Supply Voltage for Peripherals I CC VCC VCC = 2.8V Iline= 15mA Ip= 1.2mA Ip= 0mA Symbol VLN I line 11 1 0.9 2.2 2.2 44 20 DGV Test Condition Iline = 15mA Min 3.55 Typ 4.0 2.0 Max 4.25 140 11 1.35 Unit V Vdc mA mA mA V 2.7 3.4 52 31 5.8 dB dB dB 60 1 V kW Voltage Gain microphone amplifier receiving amplifier Line loss compensation Gain Control Exchange Supply Voltage Exchange Feeding bridge Resistance BLOCK DIAGRAM VCC 13 10 GV Vexch Rexch 36 0.4 LN 1 5 - IR GAR ILA1062A + 4 QR MIC+ MIC- 7 6 + 2 GAS1 DTMF (1) 11 + dB - + 3 GAS2 MUTE 12 SUPPLY AND REFERENCE CONTROL CURRENT LOW VOLTAGE CIRCUIT CURRENT REFERENCE 9 VEE 14 REG 15 AGC 8 STAB 16 SLPE (1) Pin 12 is active HIGH (MUTE) for ILA1062. Fig.1 Block diagram for ILA1062A 2 ILA1062/ILA1062A FUNCTIONAL DESCRIPTION Supplies VCC, LN, SLPE, REG and STAB Power for the IC and its peripheral circuits is usually obtained from the telephone line. The supply voltage is delivered from the line via a dropping resistor and regulated by the IC. The supply voltage VCC may also be used to supply external circuits e.g. dialing and control circuits. Decoupling of the supply voltage is performed by a capacitor between VCC and VEE . The internal voltage regulator is decoupled by a capacitor between REG and VEE. The DC current flowing into the set is determined by the exchange supply voltage Vexch , the feeding bridge resistance Rexch and the DC resistance of the telephone line Rline . The circuit has internal current stabilizer operating at a level determined by a 3.6 k? resistor connected between STAB and VEE (see Fig.6). When the line current (Iline) is more than 0.5mA greater than the sum of the IC supply current (ICC) and the current drawn by the peripheral circuitry connected to VCC (Ip) the excess current is shunted to VEE via LN. The regulated voltage on the line terminal (VLN) can be calculated as: VLN = Vref + ISLPE x R9 VLN = Vref + {(Iline - ICC - 0.5 x 10-3A) - Ip} x R9 Vref is an internally generated temperature compensated reference voltage of 3.7V and R9 is an external resistor connected between SLPE and VEE. In normal use the value of R9 would be 20?. Changing the value of R9 will also affect microphone gain, DTMF gain, gain control characteristics, sidetone level, maximum output swing on LN and the DC characteristics (especially at the lower voltages). Fig.2 Equivalent impedance circuit Under normal conditions, when ISLPE >>ICC + 0.5mA + Ip, the static behaviour of the circuit is that of a 3.7V regulator diode with an Rp R1 Leq internal resistance equal to that of R9. In the audio frequency range the dynamic impedance is largely determined by R1. Fig.2 show the equivalent impedance of the circuit. Vref At line currents below 9mA the internal reference voltage is REG VCC automatically adjusted to a lower value (typically 1.6V at 1mA). R9 This means that more sets can be operated in parallel with DC 20 C1 C3 line voltage (excluding the polarity guard) down to an absolute 100F 4.7F minimum voltage of 1.6V. At line currents below 9mA the circuit VEE has limited sending and receiving levels. The internal reference Leq = C3 x R9 x Rp voltage can be adjusted by means of an external resistor (RVA). Rp = 16.2 k This resistor when connected between LN and REG will decrease the internal reference voltage and when connected between REG and SLPE will increase the internal reference voltage. Microphone inputs MIC+ and MIC- and gain pins GAS1 and GAS2 The circuit has symmetrical microphone inputs. Its input impedance is 64 k? (2 x 32k?) and its voltage gain is typically 52 dB (when R7 = 68k?; see Fig.6). Dynamic, magnetic, piezo-electric or electret (with built-in FET source followers) can be used. The gain of the microphone amplifier can be adjusted between 44 dB and 52 dB to suit the sensitivity of the transducer in use. The gain is proportional to the value of R7 which is connected between GAS1 and GAS2. Stability is ensured by two external capacitors, C6 connected between GAS1 and SLPE and C8 connected between GAS1 and VEE. The value of C6 is 100pF but this may be increased to obtain a first-order low-pass 3 LN ILA1062/ILA1062A filter. The value of C8 is 10 times the value of C6. The cut-off frequency corresponds to the time constant R7 x C6. Input MUTE (ILA1062) When MUTE is LOW or open-circuit, the DTMF input is enable and the microphone and receiving amplifier inputs are inhibited. The reverse is true when MUTE is HIGH. MUTE switching causes only negligible clicking on the line and earpiece output. If the number of parallel sets in use causes a drop in line current to below 6 mA the DTMF amplifier becomes active independent to the DC level applied to the MUTE input. Dual-tone multi-frequency input DTMF When the DTMF input is enable dialing tones may be sent on to the line. The voltage gain from DTMF to LN is typically 25.5 dB (when R7=68k?) and varies with R7 in the same way as the microphone gain. The signalling tones can be heard in the earpiece at a low level (confidence tone). Receiving amplifier IR, QR and GAR The receiving amplifier has one input (IR) and a non-inverting output (QR). The IR to QR gain is typically 31dB (when R4 = 100k?). It can be adjusted between 20 and 31dB to match the sensitivity of the transducer in use. The gain is set with the value of R4 which is connected between GAR and QR. The overall receive gain, between LN and QR, is calculated by subtracting the anti-sidetone network attenuation (32dB) from the amplifier gain. Two external capacitors, C4 and C7, ensure stability. C4 is normally 100pF and C7 is 10 times the value of C4. The value of C4 may be increased to obtain a first-order low-pass filter. The cut-off frequency will depend on the time constant R4 x C4. The output voltage of the receiving amplifier is specified for continuous-wave drive. The maximum output voltage will be higher under speech conditions where the peak to RMS ratio is higher. Automatic gain control input AGC Automatic line loss compensation is achieved by connecting a resistor (R6) between AGC and VEE. The automatic gain control varies the gain of the microphone amplifier and the receiving amplifier in accordance with the DC line current. The control range is 5.8 dB which corresponds to a line length of 5 km for a 0.5mm diameter twisted-pair copper cable with a DC resistance of 176 ?/km and average attenuation of 1.2dB/km. Resistor R6 should be chosen in accordance with the exchange supply voltage and its feeding bridge resistance. The ratio of start and stop currents of the AGC curve is independent of the value of R6. If no automatic line-loss compensation is required the AGC pin may be left open-circuit. The amplifiers, in this condition, will give their maximum specified gain. Sidetone suppression The anti-sidetone network, R1//Zline, R2, R3, R8, R9 and Zbal suppresses the transmitted signal in the earpiece. Maximum compensation is obtained when the following conditions are fulfilled: R9 x R2 = R1 x R3+ R 8 x Z bal R 8 + Zbal (2) (1) Z bal Z bal + R 8 = Z line Z line+ R 1 If fixed values are chosen for R1, R2, R3 and R9, then condition (1) will always be fulfilled when To obtain optimum sidetone suppression, condition (2) has to be fulfilled which results in: 4 ILA1062/ILA1062A Zbal = R8 R1 x Zline = k x Zline R8 R1 Where k is scale factor; k = The scale factor k, dependent on the value of R8, is chosen to meet the following criteria: * compatibility with a standard capacitor from the E6 or E12 range for Zbal * |Zbal//R8|< (1) TA=45oC; Ptot=0.94W (2) TA=55oC; Ptot=0.82W (3) TA=65oC; Ptot=0.71W (4) TA=75oC; Ptot=0.58W 150 ILN (mA) 130 (1) TA=45oC; Ptot=1.07W (2) TA = 55oC; Ptot=0.93W (3) TA=65oC; Ptot=0.80 W (4) TA=75oC; Ptot=0.67 W (1) 150 ILN (mA) 130 110 110 (1) (2) (3) 90 (2) (3) (4) 90 70 70 (4) 50 50 30 2 4 6 8 10 VLN - VSLPE (V) 12 30 2 4 6 8 10 VLN - VSLPE (V) 12 Fig.3a Safe operating area(Standard DIP) Fig.3b Safe operating area (DIP with HS) 5 ILA1062/ILA1062A CHARACTERISTICS Characteristic Iline = 11mA to mA; VEE = 0V; f = 800Hz; TA = 25 C; unless otherwise specified. Symbol Test Condition Min Typ Max Unit o Voltage Drop over Circuit between LN and VEE VLN Variation with Temperature Voltage Drop over Circuit Between LN and VEE with External Resistor RVA Supply Current Supply Voltage available for Peripheral Circuitry |VLN/|T VLN ICC VCC MIC inputs open-circuit Iline = 1mA Iline = 4mA Iline = 15mA Iline = 100mA Iline = 140mA Iline = 15mA Iline = 15mA RVA(LN to REG) = 68kW RVA(REG to SLPE) = 39kW VCC = 2.8V Iline = 15mA; Ip = 1.2mA Ip = 0mA 3.55 4.9 1.6 1.9 4.0 5.7 -0.3 3.5 4.5 0.9 V 4.25 6.5 7.5 mV/ C V 1.35 mA V o 2.2 2.7 3.4 Microphone inputs MIC- and MIC+ (pins 6 and 7) Input Impedance Differential Single-ended Common mode rejection ratio Voltage Gain MIC+ or MIC- to LN Gain Variation with Frequency referenced to 800Hz Gain Variation with Temperature referenced o to 25 C DTMF Input (Pin 11) |Zi | CMRR Gv DGvf DGvT kW between MIC- and MIC+ MIC- or MIC+ to VEE Iline = 15mA; R7 = 68kW f = 300 and 3400 Hz without R6; Iline = 50mA; o TA = -25 and +75 C 50.5 64 32 82 52.0 0.2 0.2 kW dB dB dB dB 53.5 Input Impedance Voltage Gain from DTMF to LN Gain Variation with Frequency referenced to 800Hz Gain Variation with Temperature referenced o to 25 C |Zi | Gv DGvf DGvT Iline = 15mA; R7 = 68kW f = 300 and 3400 Hz Iline = 50mA; o TA = -25 and +75 C 243.0 20.7 25.5 0.2 0.2 27.0 kW dB dB dB Gain adjustment inputs GAS1 and GAS2 (Pins2 and 3) Transmitting Amplifier Gain variation by adjustment of R7 between GAS1 and GAS2 Sending amplifier output LN (Pin1) DGv -8 0 dB Output Voltage (RMS value) VLN(rms) Noise Output Voltage (RMS value) Receiving amplifier input IR (Pin 10) Vno(rms) THD = 10 % Iline = 4mA Iline = 15mA Iline = 15mA; R7 = 68kW; 200W between MIC- and MIC+; V 1.7 0.8 2.3 -69 dBmp Input Impedance Receiving amplifier output QR (Pin 4) |Zi | 21 kW Output Impedance Voltage Gain from IR to QR Gain Variation with Frequency referenced to 800Hz Gain Variation with Temperature referenced o to 25 C |Zo | Gv DGvf DGvT Iline = 15mA; RL = 300W; (from pin 9 to pin 4) f = 300 and 3400 Hz without R6; Iline = 50mA; o TA = -25 and +75 C 29.5 4 31 0.2 0.2 32.5 W dB dB dB Output Voltage (RMS value) Vo(rms) THD = 2%; sine wave drive; R4 = 100kW; Iline = 15mA; Ip = 0mA RL = 150W RL = 450W 0.22 0.3 0.33 0.48 V V 6 ILA1062/ILA1062A Characteristic Symbol Test Condition Min Typ Max Unit Output Voltage (RMS value) Noise Output Voltage (RMS value) Vo(rms) Vno(rms) THD = 10%; R4 = 100kW; RL = 150W; Iline = 4mA Iline = 15mA; R4 = 100kW; IR open-circuit RL = 300W 15 50 mV mV Gain adjustment input GAR (Pin 5) Receiving Amplifier Gain Variation by adjustment of R4 between GAR and QR Mute input (Pin 12) DGv -11 0 dB HIGH Level Input Voltage LOW Level Input Voltage Input Current Reduction of Gain VIH VIL IMUTE 1.5 8 VCC 0.3 15 V V mA MIC+ or MIC- to LN TEA1062 TEA1062A Voltage Gain from DTMF to QR TEA1062 TEA1062A Automatic Gain Control Input AGC (Pin 15) DGv Gv dB MUTE = HIGH MUTE = LOW R4 = 100kW; RL = 300W MUTE = HIGH MUTE = LOW 70 70 dB -17 -17 Controlling the Gain from IR to QR and the Gain from MIC+, MIC- to LN Gain Control Range Highest Line Current for Maximum Gain Lowest Line Current for Minimum Gain 2.4 Ip (mA) 1.6 DGv R6 = 110kW (between AGC and VEE) Iline = 70mA IlineH IlineL (1) 5.8 23 61 dB mA mA (2) 0.8 0 0 1 2 3 VCC(V) 4 Fig.4 Typical current Ip available from VCC for peripheral circuitry. The supply possibilities can be increased by setting the voltage drop over the circuit VLN to a higher value be resistor RVA connected between REG and SLPE. VCC > 2.2V; Iline = 15mA at VLN = 4V; R1 = 620W; R9 = 20W (1) Ip = 2.1mA. Curve (1) is valid when the receiving or when MUTE = HIGH(ILA1062), MUTE = LOW(ILA1062A). (2) Ip = 1.7mA. Curve (2) is valid when MUTE = LOW(ILA1062), MUTE = HIGH(ILA1062A) and the receiving amplifier is driven; Vo(rms) = 150mV, RL = 150W. 7 ILA1062/ILA1062A 0 GV (dB) -2 R6 = -4 -6 0 R9 = 20 20 40 60 80 100 8 120 Iline (mA) 140 Fig. 5 Variation of gain as a function of the line current with R6 as a parameter TABLE 1 Values of resistor R6 for optimum line-loss compensation at various values of exchange supply voltage (Vexch) and exchange bridge resistance (Rexch ); R9 = 20W. Vexch (V) 36 48 60 PINNING Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Symbol LN GAS1 GAS2 QR GAR MICMIC+ STAB VEE IR DTMF MUTE VCC REG AGC SLPE Positive Line Terminal Gain Adjustment; Transmitting Amplifier Gain Adjustment; Transmitting Amplifier Non-inverting Output; Receiving Amplifier Gain Adjustment; Receiving Amplifier Inverting Microphone Input Non-inverting Microphone Input Current Stabilizer Negative Line Terminal Receiving Amplifier Input Dual-tone Multi-Frequency Input Mute Input (see note 1) Positive Supply Decoupling Voltage Regulator Decoupling Automatic Gain Control Input Slope (DC resistance) Adjustment Description 400 Rexch (W) 600 Rexch (W) R6 (kW) 100 140 78.7 110 93.1 120 82 102 800 Rexch (W) 1000 Rexch (W) Note 1. Pin 12 is active HIGH (MUTE) for ILA1062 8 R1 R10 13 R2 130k 1 C5 10 IR LN VCC BAS11 (2x) 100 nF C2 4 QR C4 R3 3.92k 5 GAR C7 1 nF 7 MIC+ R4 100pF BZW14 (2x) telephone line 11 DTMF from dial and control circuits (1) BZX79 C12 620 13 + C1 100 F APPLICATION INFORMATION + ILA1062A MUTE 12 - ILA1062/ILA1062A Fig. 6 Typical application of ILA1062A, with piezo-electric earpiece and DTMF dialling 9 MICSLPE 16 R8 390 C6 100 pF Zbal R9 20 The diode bridge, the Zener and R10 limit the A different (1) Pin 12 is protection arrangement is required for pulse dialling or register recall. RVA (REG to SLPE). BT1062. active HIGH (MUTE) for The DC line voltage can be set to a higher value by the resistor 6 GAS1 2 R7 GAS2 3 REG 14 AGC 15 STAB 8 VEE 9 RVA(R16-14) C8 1 nF + C3 4.7 F R6 R5 3.6 k current into, and the voltage across, the circuit during line transients. |
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