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| ICs for Telephone AN6426NK Hands-free Speech Network IC s Overview The AN6426NK incorporates both speech network and hands-free functions. Its well designed block configuration allows realization of a hands-free telephone with a minimal number of components. 36.80.3 1 42 0.50.1 0.90.25 21 13.70.3 4.760.25 0.3 - 0.05 +0.1 Unit : mm s Features * Incorporates all the functions required of a hands-free telephone. * Incorporates all the functions required of a handset. * Complies with AC and DC impedance requirements. * Provides a wide dynamic range. * A noise detecting circuit prevents inadvertent transmission. * Operation on an external power supply is available. * Each mode can be easily controlled. * A built-in loudspeaker amplifier can operated either on line voltage or an external power supply. 22 0.960.25 4.50.25 3 to 15 15.30.25 SDIP package with 42 pins (SDIP042-P-0600A) s Block Diagram VL 38 37 - MA2 Vrl + 40 Vrl + 12 13 18 16 - + + - + - MA1 - VCC1 42 36 34 VCC2 29 6 5 35 GND 1 39 19 14 AP Buffer 15 Send 41 Power Regulator Power Regulator Power Regulator Matrix Circuit 33 32 VB TATT VB T Log Matrix Circuit 31 30 Vr1 20 21 22 23 AGC VCC1 17 24 28 VB 27 Vrl Rec Pre 11 AP Buffer - S.Amp + R Log Comp Attenator Control Vr1 - Rec.1 + - Rec.2 + Vr2 VB RATT Vr1 2 3 26 4 25 10 9 7 8 1 AN6426NK s Pin Descriptions Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 Symbol GND AGC SAO SAI Vr2 VPO RO1 RO2 RBO RPO RPI MAI1 MAO1 TL1 TLO ND1 ND2 TAI TAO ATC TAC Ground Loudspeaker amp. time constant Loudspeaker amp. output Loudspeaker amp. input Reference voltage (2) Loudspeaker amp. power supply Receiver output (1) Receiver output (2) Receiver buffer output Receiver preamp. output Receiver preamp. input MIC amp. input (1) MIC amp. output (1) Transmitter LOG amp. input Transmitter LOG amp. output Noise detection time constant (1) Noise detection time constant (2) Transmitter att. input Transmitter att. output Att. timing control Transmitter att. control Description Pin No. 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 Symbol AC RAC RVR RAO RAI RLO RLI VCC2 Att. control ICs for Telephone Description Receiver att. control To receiver rheostat Receiver att. output Receiver att. input Receiver LOG amp. output Receiver LOG amp. input Supply voltage (2) Mute (R) Receiver mute HSu/SPu HS/HF switching Mute (S) Transmitter mute APC Vr1 VB VCC MAO2 MAO2 TSI S0 VL Auto. PAD control Reference voltage (1) Reference voltage Supply voltage (1) MIC amp. input (2) MIC amp. output (2) Transmitter signal input Transmitter output Line voltage MFI MF MF signal input 2 ICs for Telephone s Absolute Maximum Ratings (Ta=25C) Parameter Supply voltage Supply current Power dissipation (Ta = 60C) Operating ambient temperature Storage temperature Symbol VL IL PD Topr Tstg Rating 14.4 120 1700 -20 to + 60 -55 to +150 AN6426NK Unit V mA mW C C Note) The IC must be used under the condition PD>VCC x ICC. s Recommended Operating Range (Ta=25C) Parameter Operating supply voltage range Symbol VL Range 3V to 12V s Electrical Characteristics (Ta=25C) Parameter Power Supply DC line voltage (1) DC line voltage (2) Int. supply voltage (1) Int. supply voltage (2) Int. regulated voltage (1) Int. regulated voltage (2) HSU Receiver Rec. gain Max. rec. level MF rec. gain MF max. rec. level AP (R) characteristics HSU Transmitter Trans. gain Max. trans. level MF trans. gain MF max. trans. level AP (S) characteristics SPU Receiver Att. rec. gain Att. trans. gain Loudspeaker amp. (1) Loudspeaker amp. (2) Loudspeaker amp. (3) Rheostat characteristics (1) GARR GART VOSP (1) VOSP (2) VOSP (3) VV 26 26 4 4 4 26 25 25 3 3 3 25 ni=-20dBm ni=-20dBm, I20=14A T12-T11 Value VPO=3V, THD=5% VPO=5V, THD=5% VPO=7V, THD=5% V24=V35, ni=-20dBm, IL=60mA -6.5 -38 -10 -4 0 -28 -3.5 -33 -5 1 4 -25 -22 - 0.5 -28 dB dB dBm dBm dBm dBm GS VS GMS VMS DGS 37 37 40 40 37 42 42 42 42 42 ni=-25dBm nO=2.5dBm fi=1kHz, ni=-25dBm fi=1kHz, nO=1dBm Gain difference with ni=-25dBm as IL changes between 30 and 80mA 26 2.5 22 1 -6 29 5.5 25 4 -4 32 8.5 28 7 0 dB dBm dB dBm dB GR VR GMR VMR DGR VL (1) VL (2) VCC (1) VCC (2) VB (1) VB (2) Voltage at Pin42 with IL=20mA Voltage at Pin42 with IL=120mA Voltage at Pin36 with IL=20mA Voltage at Pin36 with IL=120mA Voltage at Pin35 with IL=20mA Voltage at Pin35 with IL=120mA input pin output pin Symbol Condition min 3.6 9.0 1.8 6.0 0.95 1.10 36 4 3 5 -8 typ 4.2 11.0 2.3 7.0 1.10 1.20 39 7 6 8 -6 max 5.2 12.0 2.8 9.0 1.35 1.45 42 10 9 11 -4 Unit V V V V V V dB dBm dB dBm dB 11 11 40 40 11 nO=4dBm fi=1kHz, 7, 8 ni=-25dBm fi=1kHz, 7, 8 nO=5dBm Gain difference with 7, 8 ni=-60dBm as IL changes between 30 and 80mA 7, 8 7, 8 ni=-60dBm 3 AN6426NK s Electrical Characteristics (cont.) (Ta=25C) Parameter Rheostat characteristics (2) LOG amp. linearity SPU Transmitter MIC amp. gain MIC amp. max. output Trans. gain Max. trans. level Att. trans. gain Att. rec. gain Idling LOG amp. linearity GMAI VMAI GTS VTS GATT DGATR VId LT Symbol DGV LR 26 25 Condition V24=0V, ni=-20dBm, IL=60mA min -27 40 ICs for Telephone typ -22 50 max -17 Unit dBm dB IL=60mA, Ii=-1A to -300A Input pins Output pins 12 12 39 39 18 18 18 13 13 42 42 19 19 19 ni=-60dBm IL=60mA IL=60mA THD=5% ni=-25dBm IL=60mA IL=60mA THD=10% ni=-20dBm IL=60mA ni=-20dBm IL=60mA ni=-20dBm IL=60mA 32 1 17 4 -2.5 -34 -18 40 35 4 20 7 0.5 -29 -15 50 38 7 23 10 3.5 -24 -12 dB dBm dB dBm dB dB dB dB IL=60mA Ii= -1A to -300A Note) Unless otherwise specified, fi=1kHz, IL=30mA(HSU), 60mA (SPU). s Application Circuit DPin D.B. Q1 L1 R132 1M R29 ZNR 100k 390V Q2 R31 680 L2 R21 100k R25 3.9k R27 R26 330 3.3k MFIN MIC(HSU) R36 100k D3 b Q6 C180.1F R23 SW C26 + R18 a 680 R24A 100k 220F R21 2.2k 12k R16 R20 0.068F C17 C28 S3 2.2 C25 43k 33 0.039F S2 a b + M + C24 ++ + F 0.001 C19 6.8 220 220 F 1F F F b a C21 k C23 b R28 20kB C22 47F R19 33 R28A R15 C20 C33 D4 C34 0.1 4.7 C18 10 F R17 F 10 D5 20 2.2 + F F 5.1 1F k Z R14 R13 k R22 27 22k k 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 AN6426NK 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 D6 AC Adaptor 100mA R24 10k D1 C3 + 220 F C2 10 F Q3 R35 10 C1 10F + 3300 pF C7 C5 0.033F GND R2 R3 C30 C31 + 1000F + 100F + 100F C32 0.033F 1k 1k 220 k R1 + C4 100F C6 a SP(SPU) CS(HSU) C9 1F 820 C14 R4 pF R6 C11 390 22 220 1 k k F R8 C27 R10 820 22F 100 C15 + k 2.2F R7 R5 1k + C12 + R11 + C8 C10 1 220 0.1F 1F F R9 k 2.2 M R37 2.2k + C16 2.2 F R10 5.1 k R12 22k SW6 MIC(SPU) Note) The circuit a applies when a ceramic receiver is used. When a dynamic receiver is used, the following circuits apply. 7 8 C5 0.033F + C6 10F CS (HSU) C6 0.033F 4 ICs for Telephone s Pin Descriptions 1. Hand Set Communications Block (HSu) [ Transmitter System] Microphone amplifier Input : pin3 (minus input), Output : Pin38 (collector output) The gain and frequency characteristics are determined by the external resistors R19 (6.8k)and R20 (43k), and capacitors C24 (0.068F)and C25 (1,000pF). R21 (2.2k)is a resistor for the power supply for ECM. AN6426NK 33 37 38 [Receiver System] Receiver preamplifier Input : Pin11(minus input), Output : Pin10 (collector output) The gain and frequency characteristics are determined by the external resistors R5 (1k)and R4 (22k), and capacitors C8 (0.1F)and C7 (3,300pF) Transmitter selector switch Input : Pin39 (speech), Pin40 (MF, holding tone) The switch changes over transmitter input for hand set communications, transmitter input for hand-free communications, and MF (Multi Frequency) input. The input impedance at the Pin39 is 3.9k and DC is VR (Pin34) C33 (4.7F) is a DC preventive capacitor. R22 (33k) is to adjust the input to the log amplifier. which is to detect the transmission level. It attenuates the amplifier input to 3.9/(3.9+R22 (33k) The input impedance at the Pin40 is 3.35k and DC is VR. C34 is input through 10F. 11 10 39 Receiver selector switch Input : Pin10, Pin40 The switch changes over receiver input for hand set communications and MF input. Receiver automatic pad Control : Pin33 Common with transmitter automatic pad Receiver buffer amplifier Output : Pin9 Outputs a receiver signal for hand-free communications at low inpedance. 40 9 Transmitter automatic pad Control : Pin33 Varies the transmitter/receiver gain by the value of the current supplied to the IC. A variable point can be moved by R18 (100k). Increasing R18 causes AP to start operation at a higher line current. 5 AN6426NK s Pin Descriptions (cont.) Receiver output Output : Pin7, Pin8 Drives the ceramic receiver directly. The gain depends on an internal resistance and is about 23dB. The frequency characteristic control capacitors C5 (0.033F) and C6 (0.033F), and output level control resistors R2(1k)and R3 (1k)are attached. 14 15 ICs for Telephone 16 17 28 27 + - 8 7 24 2. Hand-free Speech network Block (SPU) [Transmitter System] Microphone amplifier Input : Pin12(minus input), Output : Pin13(emitter output) The gain and frequency characteristics are determined by the external resistors R7(820)and R6(47k), and capacitors C10 (1F) and C9 (820pF). R37 (2.2k) is a resistor for the power supply to ECM. 13 12 Transmitter log amplifier Input : Pin14(current input), Output : Pin15 (voltage output) The input voltage is converted into a current at R8(390)and C11 (0.1F). The attack and recovery time are determined by R9 (2.2M)and C12(1F). Receiver log amplifier Input : Pin28 (current input), Output : Pin27 (voltage output) The input voltage is converted into a current at R17 (2.2k)and C20 (0.1F). The attack and recovery time are determined by R16 (2.2M)and C19 (1F). Noise detector circuit Output : Pin16, Pin17 When a continuous sound (noise 9) is input, the transmitter is set to -10dB. The attack time for this operation is determined by R10 (100k)and C27 (22F), and the recovery time by R11(220k)and C15 (2.2F). To stop the noise detector circuit, ground the Pin16. Receiver VR Control : Pin24 A smoothed voltage is given by C17 (33F). Normally, VB (Pin35) is divided and given by R15 (20k). The output becomes maximum when the voltage at the Pin24 is VB, and -31dB when 0V. Transmitter attenuator Input : Pin18 (Zi=15k), Output : Pin19 (emitter output) The input is of only AC component due to C14 (1F). At transmission time, an attenuation amount is varied within a range of about 0 to -36dB by the Gilbert circuit. The Pin18 is 15k and connected to the VB Pin (1.2V) 6 ICs for Telephone s Pin Descriptions (cont.) Receiver attenuator Input : Pin26 (Zi=15k), Output : Pin25 (emitter output) The input is of only AC component due to C18 (1F). At transmission time, an attenuation amount is varied within a range of about 0 to -36dB by the Gilbert circuit. The Pin25 is 15kk and connected to the VB pin (1.2V). 18 19 AN6426NK Attenuator timing control (TAC) Control : Pin20 Controls the transmitter/receiver attenuator switching speed with C16(2.2F). V20-29 0V in the transmitter mode, and V20-29 -120mV in the receiver mode. Transmitter attenuator control (TAC) Control : Pin21 Controls the transmitter attenuator gain with R12(22k). Receiver attenuator control (RAC) Control : Pin23 Controls the receiver attenuator gain with R13 (22k). Transmitter/receiver attenuator control (AC) Control : Pin22 Controls the transmitter/receiver attenuator gain with R14 (27k). 26 25 20 21 22 23 [Control System] High level ; 1 to 5V, Low level ; 0 to 0.5V Controllable with the microcomputer. HSU/SPU selector switch Control : Pin30 High : HSU, Low : SPU Transmitter mute switch Control : Pin32, High : Transmission, Low : Mute (MF transmission) Receiver mute switch Control : Pin30, High : Reception, Low : Mute (MF reception) Speaker amplifier Input : Pin4, Output : Pin3, AGC : Pin2 Plus input amplifier of about 34 dB and driven at 25. The input is of only AC component due to C3 (10F). The output drives the 25 speaker througt C2 (220F). The attack time and recovery time for AGC is determined by C1 (10F) and R1(220k). 6 2 4 Logic Circuit 3 5 30 31 32 7 AN6426NK s Pin Descriptions (cont.) 3. Power Supply Block HSU voltage source (VCC1) Stabilized by the Pin36 and C22 (220F). HSU reference voltage (Vr1) Results in VCC/2 by resistance division (20k)from the Pin34 and VCC, and stabilized by C22 (220F) Constant voltage source (VB) Results in 1.2V by the Pin35 (band gap reference). Stabilized by C23 (220F) Ground pin (GND) Pin1 (common with the GND pin of the speaker amplifier) ICs for Telephone Speaker amplifier voltage source (VPO) Pin6. It is necessary to stabilize the power supply in order to prevent a receiver signal from leaking to the circuit.(R34, C30, D1, Q3, C31, R35, C32, Q4) An AC adapter is available. (Q5, R33, D2, S5) Speaker amplifier reference voltage (Vr2) Pin5 (VCC2/2) Stabilized by C4 (100F) 42 6 Bandgap reference 35 34 4. Other Circuit Blocks Balance network circuit Prevents howling. (R25, R26, R24, C28, R27, R28) Telephone circuit connection circuit Determines the polarity of the telephone circuit. (DB, R30, Q1, R32, R29, Q2, R31, C29) SPU voltage source (VCC2) The Pin29 (normally connected to VCC Pin1) is stabilized by C21 (100F). A voltage can be applied from the outside. (S4, Q6, R36, D3, S1) 29 42 36 41 1 s Supplementary Explanation * Electrical Characteristics Design Reference Values (Ta=25C) Parameter AC Impedance (1) AC Impedance (2) AC Impedance (3) Symbol Zac (1) Zac (2) Zac (3) Condition HSU IL=20mA, f=1kHz HSU IL=90mA, f=1kHz SPU IL=20mA, f=1kHz min 450 450 450 typ 610 610 610 max 750 750 750 Unit Note) The above characteristics are design reference values and not guaranteed values. 8 ICs for Telephone s Characteristics Curve VL -- IL 10 AN6426NK Handset Receiver I/O Characteristics Transmitter Output 42 (dB) 10 Handset Transmitter I/O Characteristics 10 Receiver Output 7--8 (dB) 0 0 Circuit Voltage VL (V) 8 -10 -10 6 -20 -20 4 -30 IL=40mA f=1kHz -30 2 -40 -40 0 0 20 40 60 80 100 120 -50 -70 -60 -50 -40 -30 -20 -10 -50 -70 - 60 -50 -40 -30 -20 -10 Circuit Current IL (mA) Receiver Input ( 11) (dB) Microphone Input 37 (dB) Transmitter Output 4--2 (dB) i= 60dBm f=1kHz Log Amplifier Output Voltage Change Amount DVO (mV) Handset Receiver Automatic Pad Characteristics Receiver Output 7--8 (dB) Handset Transmitter Automatic Pad Characteristics Log Amplifier Characteristics for Hands-free Speech Network 200 150 100 50 0 -50 6 4 2 0 -2 -4 -6 i=25dBm f=1kHz -20 -30 0 20 40 60 80 100 120 0 20 40 60 80 100 120 - 0.1 -1 -10 -100 Circuit Current IL (mA) Circuit Current IL (mA) Log Amplifier Input Current (A) Hands-free Speech network Transmitter Receiver Switching Attenuation (dB) 0 Receiver ( 25) Speaker out 1 VPP -10 Mic in Transmitter out 20mVPP -20 Trabsnutter ( 19) Power Dissipation PD (mW) Receiver in -30 ,,,,,,,,,,, ,,,,,,,,,,, ,,,,,, ,,,,,, ,,,,,,, ,,,,,,, ,,,,,,, ,,,,,,, 40ms Hands-free Speech network Transmitter/Receiver Switching 10mVPP 2000 PD--Ta (IC Singular) (1880mW) 2 VPP 1000 0 20 40 60 80 100 120 0 0 25 50 75 100 125 150 DV (VCC--VATC) (mV) Ambient Temperature Ta (C) 9 |
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