Features • • • • • • • • • • • • • • • • DC Characteristic Adjustable Transmit and Receive Gain Adjustable Symmetrical Input of Microphone Amplifier Anti-clipping in Transmit Direction Automatic Line-loss Compensation Built-in Ear Protection DTMF and MUTE Input Adjustable Sidetone Suppression Independent of Sending and Receiving Amplification Integrated Amplifier for Loudhearing Operation Anti-clipping for Loudspeaker Amplifier Improved Acoustical Feedback Suppression Selectable Line Impedance Voice Switch Supply Voltages for All Functional Blocks of a Subscriber Set Operation Possible from 10-mA Line Current Filters Against EMI on Critical I/O Benefits • Complete System Integration of Analog Signal Processing on One Chip • Very Few External Components • Less Components for EMI protection Monolithic Integrated Feature Phone Circuit U4089B-P Applications • • • • Feature Phones Answering Machines Fax Machines Speaker Phones Description The telephone circuit U4089B-P is a linear integrated circuit for use in feature phones, answering machines and fax machines. It contains the speech circuit, sidetone equivalent and ear protection rectifiers. The circuit is line-powered and contains all components necessary for the amplification of signals and adaptation to the line. An integrated voice switch with loudspeaker amplifier enables loudhearing or handsfree operation. With an anti-feedback function, acoustical feedback during loudhearing can be reduced significantly. The generated supply voltage is suitable for a wide range of peripheral circuits. Electrostatic sensitive device. Observe precautions for handling. Rev. 4518A–CORD–05/02 1 Figure 1. Simple Block Diagram Speech circuit Audio amplifier Voice switch Dialer Figure 2. Block Diagram GT STO 44 MIC1 MIC2 32 VL 7 IMPSEL AGA IND 600 Ω 3 MIC 41 TTXA TLDT 9 10 13 900 Ω 26 29 28 Power supply Impedance control 33 VM GND 8 TX ACL 27 TLDR 6 TXA 1 INLDT 30 4 DTMF INLDR 20 V MP SENSE V B Current supply AGA control Acoustical feedback suppression control 25 Transmit mute control 31 I REF Supply ATAFS 11 SAO 21 Rattenuation SACL TSACL 23 SAI 22 GSA 2 24 39 MUTX RECO 40 GR 36 STI 42 RECIN U4089B-P 4518A–CORD–05/02 U4089B-P Pin Configuration TLDR TLDT INLDR INLDT 32 31 30 29 28 27 26 25 24 23 VMP 13 NC 14 NC 15 NC 16 NC 17 NC 18 NC 19 20 21 IMPSEL TSACL GSA 22 SAI AGA 33 NC 12 MUTX IREF 34 SAO 11 ATAFS STO 35 VB 10 VM 36 9 SENSE NC 37 8 GND NC NC 38 7 VL STI NC 39 6 IND RECO 40 5 NC GR 41 4 MIC1 TTXA 42 3 MIC2 NC 43 2 NC GT 44 1 DTMF RECIN Figure 3. Pinning SSO44 Pin Description Pin Symbol Function 1 DTMF Input for DTMF signals. Also used for the answering machine and hands-free input. 3 MIC 2 Non-inverting input of microphone amplifier. 4 MIC 1 Inverting input of microphone amplifier. 6 IND The internal equivalent inductance of the circuit is proportional to the value of the capacitor at this pin. A resistor connected to ground may be used to reduce the DC line voltage. Line voltage. 7 VL 8 GND 9 SENSE 10 VB 11 SAO Output of loudspeaker amplifier. 13 VMP Regulated supply voltage 3.3 V for peripheral circuits. The maximum output current is 2 mA. Reference point for DC and AC output signals. A small resistor (fixed) connected from this pin to VL sets the slope of the DC characteristic and also affects the line-length equalization characteristics as well as the line current at which the loudspeaker amplifier is switched on. Unregulated supply voltage for peripheral circuits (voice switch); limited to typically 7 V. 20 IMPSEL Control input for selection of line impedance 1) 600 Ω 2) 900 Ω 3) Mute of second transmit stage (TXA); also used for indication of external supply (answering machine); last chosen impedance is stored. 21 TSACL Time constant of anti-clipping of speaker amplifier. 22 GSA Current input for setting the gain of the speaker amplifier. Adjustment characteristic is logarithmical. For RGSA > 2 MΩ, the speaker amplifier is switched off. SA I Speaker amplifier input (for loudspeaker, tone ringer and hands-free use). 23 Note: Filters against electromagnetic interference (EMI) are located at the Pins MIC1, MIC2, RECIN and STI. 3 4518A–CORD–05/02 Pin Description Pin Function 24 MUTX Three-state input of transmit mute: 1) Speech condition; inputs MIC1/MIC2 active. 2) DTMF condition; input DTMF active. A part of the input signal is passed to the receiving amplifier as a confidence signal during dialing. 3) Input DTMF used for answering machine and hands-free use; receive branch is not affected. 25 ATAFS Attenuation of acoustical feedback suppression. Maximum attenuation of AFS circuit is set by a resistor at this pin. Without the resistor, AFS is switched off. 26 INLDT Input of transmit level detector. 27 INLDR Input of receive level detector. 28 TLDT Time constant of transmit level detector. 29 TLDR Time constant of receive level detector. 30 AGA Automatic gain adjustment with line current. A resistor connected from this pin to GND sets the starting point. Maximum gain change is 6 dB. 31 IREF Internal reference current generation; RREF = 62 kΩ; IREF = 20 µA 32 STO Side-tone reduction output. Output resistance is approximately 300 Ω. Maximum load impedance is 10 kΩ. 33 VM Reference node for microphone-earphone and loudspeaker amplifier. Supply for electret microphone (IM ≥ 300 mA). 36 STI Input for side-tone network. 39 RECO Output of receiving amplifier. 40 GR A resistor connected from this pin to GND sets the receiving amplification of the circuit; amplifier RA1 can be muted by applying V MP to GR. 41 TTXA Time constant of anti-clipping in transmit path. 42 RECIN Input of receiving path; input impedance is typically 80 kΩ. 44 GT Note: 4 Symbol A resistor from this pin to GND sets the amplification of microphone and DTMF signals; the input amplifier can be muted by applying VMP to GT. Filters against electromagnetic interference (EMI) are located at the Pins MIC1, MIC2, RECIN and STI. U4089B-P 4518A–CORD–05/02 U4089B-P DC Line Interface and Supply-voltage Generation The DC line interface consists of an electronic inductance and an output stage which charges the capacitor at VB. The value of the equivalent inductance is given by: L = RSENSE × CIND × (RDC × R30) / (RDC + R30) In order to improve the supply during worst-case operating conditions, the PNP current source (IBOPT) supplies an extra amount of current to the supply voltages when the NPN in parallel is unable to conduct current. The U4089B-P contains a series regulator which provides a supply voltage VMP of 3.3 V at 2 mA suitable for a microprocessor. Figure 4. DC Line Interface with Electronic Inductance and Generation of Regulated and Unregulated Supply VL 10 SENSE RSENSE I BOPT < 5 mA V MP CIND 10 µF IND + + - - R30 30 k RDC 3.3 V/ 2 mA 3.3 V 47 µF VB 7V 220 µF V OFFS Figure 5. Functional Blocks for Power Supply VB VL Voltage regulator Power supply LIDET 7V V MP ES V LON TXA TXACL OFFSA COMP SAL, SA SACL AFS IMPED CONTR IMPSEL MIC, DTMF AGA, RA TX MUTE MUT REC, STBAL RECATT 5 4518A–CORD–05/02 1. In speech condition, the system is supplied by the line current. If the LIDET-block detects a line voltage above the fixed threshold (1.9 V), the internal signal VLON is activated, thus switching on all blocks of the chip. For line voltages below 1.9 V, the switches remain in their quiescent state as shown in Figure 5. OFFSACOMP disables the group listening feature (SAI, SA, SACL, AFS) below line currents of approximately 10 mA. 2. Selecting IMPSEL = high impedance activates all switches at the ES line. Acoustic Feedback Suppression Acoustical feedback from the loudspeaker to the handset microphone may cause instability in the system. The U4089B-P offers a very efficient feedback suppression circuit which uses a modified voice switch topology. Figure 6 shows the basic system configuration. Two attenuators (TX ATT and RX ATT) reduce the critical loop gain by introducing an externally adjustable amount of loss either in the transmit or in the receive path. The sliding control in block ATT CONTR determines whether the TX or the RX signal has to be attenuated. The overall loop gain remains constant under all operating conditions. Selection of the active channel is made by comparison of the logarithmically compressed TX and RX envelope curves. The system configuration for group listening, which is realized in the U4089B-P, is illustrated in Figure 7. TXA and SAI represent the two attenuators; the logarithmic envelope detectors are shown in a simplified way (operational amplifiers with two diodes). Figure 6. Basic Voice-switch System TX attenuation Handset microphone Logarithmic Hybrid Attenuation control Line Logarithmic Loud speaker 6 RX attenuation U4089B-P 4518A–CORD–05/02 U4089B-P Figure 7. Integration of the Acoustic Feedback-suppression Circuit Into the Speech Circuit Environment V GT INLDT VBG TLDT STO B VL VL ZL + Zint SAO AFS control Max att. - GSA + AGA VBG RECIN SAI SAI TLDR RECO INLDR GR STI STO STN Figure 8. Acoustic Feedback Suppression by Alternative Control of Transmit- and Speaker Amplifier Gain TLDT TXA RLDT SAI INLDT AGA AGA IAGAFS RLDR INLDR IATGSA TLDR ATAFS IGSA GSA RATAFS 7 4518A–CORD–05/02 A detailed diagram of the AFS (Acoustic Feedback Suppression) is given in Figure 8. Receive and transmit signals are first processed by logarithmic rectifiers in order to produce the speech envelopes at TLDT and RLDT. After amplification, a decision is made by the differential pair which direction should be transmitted. The attenuation of the controlled amplifiers TXA and SAI is determined by the emitter current IAT which is comprised of three parts: IATAFS IATGSA IAGAFS sets maximum attenuation decreases the attenuation when speaker amplifier gain is reduced decreases the attenuation according to the loop-gain reduction caused by the AGA function IAT = IATAFS - IATGSA - IAGAFS ∆G = IAT × 0.67 dB/µA Figure 9 illustrates the principal relationship between speaker amplifier gain (GSA) and attenuation of AFS (ATAFS). Both parameters can be adjusted independently, but the internal coupling between them has to be considered. The maximum GSA value to be used is 36 dB. The shape of the characteristic is moved in the x-direction by adjusting resistor RATAFS, thus changing ATAFS m . The actual value of the attenuation (ATAFSa), however, can be determined by reading the value which belongs to the actual gain GSAa. If the speaker amplifier gain is reduced, the attenuation of AFS is automatically reduced by the same amount in order to achieve a constant loop gain. Zero attenuation is set for speaker gains GSA ≥ GSA0 = 36 dB - ATAFSm. Figure 9. Reducing Speaker Amplifier Gain Results in an Equal Reduction of AFS Attenuation ATAFS (dB) ATAFS m ATAFS a GSA o Operating Range of Speaker Amplifier 8 RATAFS RATAFS GSA a 36 dB not usable GSA (dB) The basic behavior is illustrated in Figure 10. Actual values of ILON/ILOFF vary slightly with the adjustment of the DC characteristics and the selection of the internal line impedance. U4089B-P 4518A–CORD–05/02 U4089B-P Figure 10. Threshold of Speaker Amplifier SA on SA off IL off IL on IL Figure 11. Comparator Thresholds Depend on DC Mask and Line Impedance 7 RDC = ∞ 6 VL ( V) RDC = 130 k 5 RDC = 68 k 4 3 10.0 12.0 14.0 16.0 18.0 20.0 I L ( mA ) = ILON at line impedance = 600 Ohm = ILOFF at line impedance = 600 Ohm = ILON at line impedance = 900 Ohm = ILOFF at line impedance = 900 Ohm Absolute Maximum Ratings Parameters Symbol Value Unit Line current IL 140 mA DC line voltage VL 12 V Junction temperature Tj 125 °C Ambient temperature Tamb - 25 to + 75 °C Storage temperature Tstg - 55 to + 150 °C Total power dissipation, Tamb = 60°C, SSO44 Ptot 0.9 W ESD (Human Body Model), ESD S 5.1 Standard VESD 1.5 kV ESD (Machine Model), JEDEC A115A VESD 150 V Symbol Value Unit RthJA 70 K/W Thermal Resistance Parameters Junction ambient 9 4518A–CORD–05/02 Electrical Characteristics f = 1 kHz, 0 dBm = 775 mVrms, IM = 0.3 mA, IMP = 2 mA, RDC = 130 kΩ, Tamb = 25°C, RGSA = 560 k, Zear = 68 nF + 100 Ω, ZM = 68 nF, Pin 30 open (AGA), VMUTX = GND, see Figure 22 (AC tests), unless otherwise specified. Parameters Test Conditions Pin Symbol Min. Typ. Max. Unit DC Characteristics (see Figure 19) DC voltage drop over circuit IL IL IL IL = 2 mA = 14 mA = 60 mA = 100 mA VL 4.6 8.8 2.4 5.0 7.5 9.4 10.0 V V V V 5.4 Transmission Amplifier, IL = 14 mA, VMIC = 2 mV, RGT = 27 k, Unless Otherwise Specified Adjustment range of transmit gain GT 40 45 50 dB 47 39.8 48 49 41.8 dB Transmitting amplification RGT = 12 k RGT = 27 k GT Frequency response IL ≥ 14 mA, f = 300 to 3400 Hz ∆GT ± 0.5 dB Gain change with current Pin 30 open (AGA), IL = 14 to 100 mA ∆GT ± 0.5 dB Gain deviation Tamb = -10 to +60°C ∆GT ± 0.5 dB CMRR of microphone amplifier CMRR 60 80 45 50 75 Input resistance of MIC amplifier RGT = 12 k RGT = 27 k Ri Distortion at line IL > 14 mA VL = 700 mVrms dt Maximum output voltage IL > 19 mA, d < 5% Vmic = 25 mV CTXA = 1 µF Noise at line psophometrically weighted IL > 14 mA GT = 48 dB Anti-clipping attack time release time CTXA = 1 µF each 3 dB overdrive Gain at low operating current Distortion at low operating current IL = 10 mA IM = 300 µA IMP = 1 mA RDC = 68 kΩ Vmic = 10 mV dt Mute suppression a) MIC muted (microphone preamplifier) IL ≥ 14 mA Mutx = open 110 kΩ 2 % 3 4.2 dBm -80 -72 dBmp 0.5 9 GT IL = 100 mA, RAGA = 20 kΩ 1.8 no IL = 10 mA IMP = 1 mA RDC = 68 kΩ Vmic = 1 mV IM = 300 µA Line-loss compensation 10 VLmax dB 40 ∆GTI -6.4 -5.8 GTM 60 80 ms ms 42.5 dB 5 % -5.2 dB dB U4089B-P 4518A–CORD–05/02 U4089B-P Electrical Characteristics (Continued) f = 1 kHz, 0 dBm = 775 mVrms, IM = 0.3 mA, IMP = 2 mA, RDC = 130 kΩ, Tamb = 25°C, RGSA = 560 k, Zear = 68 nF + 100 Ω, ZM = 68 nF, Pin 30 open (AGA), VMUTX = GND, see Figure 22 (AC tests), unless otherwise specified. Parameters Test Conditions Pin Symbol Min. Typ. Max. Unit +2 dB Receiving Amplifier, IL = 14 mA, RGR = 62 kΩ, Unless Otherwise Specified, VGEN = 300 mV Adjustment range of receiving gain IL ≥ 14 mA, single-ended GR Receiving amplification RGR = 62 kΩ RGR = 22 kΩ GR Amplification of DTMF signal from DTMF IN to RECO IL ≥ 14 mA VMUTX = VMP GRM Frequency response IL > 14 mA, f = 300 Hz to 3400 Hz Gain change with current Gain deviation -8 -7.75 -7 1.5 -6.25 1 4 7 dB ∆G RF ± 0.5 dB IL = 14 to 100 mA ∆G R ± 0.5 dB Tamb = -10 to +60°C ∆G R ± 0.5 dB Ear protection IL ≥ 14 mA VGEN = 11 Vrms EP 1.1 Vrms MUTE suppression DTMF operation IL ≥ 14 mA VMUTX = VMP ∆G R Output voltage d ≤ 2% IL = 14 mA Zear = 68 nF Maximum output current d ≤ 2% Zear = 100 Ω Receiving noise psophometrically weighted Zear = 68 nF + 100 Ω IL ≥ 14 mA ni Output resistance Output against GND Ro Line-loss compensation RAGA = 20 kΩ, IL = 100 mA Distortion at low operating current 60 dB 0.5 Vrms 4 mA (peak) -80 -77 dBmp 10 Ω ∆GRI -7.0 -6.0 -5.0 dB Zimp 840 900 960 Ω IL = 10 mA IMP = 1 mA IM = 300 µA VGEN = 560 mV RDC = 68 kΩ GR -8 -7 -6 dB IL = 10 mA IMP = 1 mA VGEN = 560 mV RDC = 68 kΩ dR 5 % ILmin 15 mA 22 kΩ 37.5 dB dB AC impedance Gain at low operating current dB Speaker Amplifier Minimum line current for operation No AC signal Input resistance Gain from SAI to SAO 23 VSAI = 3 mV, IL = 15 mA, RGSA = 560 kΩ RGSA = 20 kΩ 14 GSA 35.5 36.5 -3 11 4518A–CORD–05/02 Electrical Characteristics (Continued) f = 1 kHz, 0 dBm = 775 mVrms, IM = 0.3 mA, IMP = 2 mA, RDC = 130 kΩ, Tamb = 25°C, RGSA = 560 k, Zear = 68 nF + 100 Ω, ZM = 68 nF, Pin 30 open (AGA), VMUTX = GND, see Figure 22 (AC tests), unless otherwise specified. Parameters Test Conditions Output power Load resistance RL = 50 Ω, d < 5% VSAI = 20 mV IL = 15 mA IL = 20 mA Output noise (input SAI open) psopho-metrically weighted IL > 15 mA Gain deviation Mute suppression Pin Symbol Min. Typ. PSA PSA 3 7 20 Max. Unit mW mW nSA 200 µVpsoph IL = 15 mA Tamb = -10 to +60°C ∆G SA ±1 dB IL = 15 mA, VL = 0 dBm, VSAI = 4 mV Pin 23 open VSAO -60 dBm Gain change with current IL = 15 to 100 mA ∆G SA ±1 dB Resistor for turning off speaker amplifier IL = 15 to 100 mA 2 MΩ Gain change with frequency IL = 15 mA f = 300 to 3400 Hz ±0.5 dB Attack time of anti-clipping 20 dB over drive Release time of anti-clipping RG SA 0.8 1.3 ∆G SA tr 5 ms tf 80 ms TMF Amplifier Test Conditions: IMP = 2 mA, IM = 0.3 mA, VMUTX = VMP Adjustment range of DTMF gain IL = 15 mA Mute active GD 40 DTMF amplification IL = 15 mA, VDTMF = 8 mV Mute active: MUTX = VMP GD 40.7 Gain deviaton IL = 15 mA Tamb = -10 to +60°C GD Input resistance RGT = 27 kΩ, RGT = 15 kΩ Ri Distortion of DTMF signal IL ≥ 15 mA VL = 0 dBm Gain deviation with current IL = 15 to 100 mA 50 dB 42.7 dB ±0.5 dB 300 130 kΩ dD 2 % ∆GD ±0.5 dB 50 dB 60 26 41.7 180 70 AFS Acousting Feedback Suppression Range of attenuation IL ≥ 15 mA Attenuation of transmit gain IL ≥ 15 mA, IINLDT = 0 µA RATAFS = 30 kΩ IINLDR = 10 µA ∆GT 45 dB Attenuation of speaker amplifier IL ≥ 15 mA IINLDP = 0 µ RATAFS = 30 kΩ IINLDR = 10 µ ∆G SA 50 dB AFS disable IL ≥ 15 mA VATAFS 12 0 1.5 V U4089B-P 4518A–CORD–05/02 U4089B-P Electrical Characteristics (Continued) f = 1 kHz, 0 dBm = 775 mVrms, IM = 0.3 mA, IMP = 2 mA, RDC = 130 kΩ, Tamb = 25°C, RGSA = 560 k, Zear = 68 nF + 100 Ω, ZM = 68 nF, Pin 30 open (AGA), VMUTX = GND, see Figure 22 (AC tests), unless otherwise specified. Parameters Test Conditions Pin Symbol Min. Typ. Max. Unit IL = 14 mA, RDC = 68 kΩ IMP = 2 mA VMP 3.1 3.3 3.5 V IL w 14 mA, IM = 300 µA RDC = 130 kΩ VM 1.4 3.3 V IB = + 20 mA, IL = 0 mA VB 7 7.6 V Input current VMUTX = VMP VMUTX = GND IMUTX IMUTX +20 -20 +30 -30 µA µA Input voltage Input high Supply Voltages, Vmic = 25 mV, Tamb = -10 to +60°C VMP VM VB MUTX Input (see Figure 20) Input low VMUTX VMUTX VMP 0.3 V V 0.3 V 13 4518A–CORD–05/02 U4089B-P Control MUTX MODE 0 MIC 1/2 transmit enabled receive enable AFS = on AGA = on TXACL = on Speech Z DTMF transmit enabled receive enable AFS = on AGA = on TXACL = on For answering machine 1 DTMF transmit enabled DTMF to receive enable AFS = off AGA = off TXACL = off DTMF dialling IMPSEL MODE 0 Line impedance = 600 Ω TXA = on ES = off Speech 0 to Z Line impedance = 600 Ω TXA = off ES = on Transmit mute 1 to Z Line impedance = 900 Ω TXA = off ES = on Transmit mute 1 Line impedance = 900 Ω TXA = on ES = off Speech Logic-level 0 = < (0.3 V) Z = > (1 V) < (VMP - 1 V) or (open input) 1 = > (VMP - 0.3 V) AFS = Acoustical feedback-suppression control AGA = Automatic gain adjustment TXACL = Transmit anti-clipping control ES = External supply 14 U4089B-P 4518A–CORD–05/02 U4089B-P Figure 12. Typical DC Characteristic Figure 13. Typical Adjustment Range of the Transmit Gain GT (dB) RGT (kohm) 15 4518A–CORD–05/02 Figure 14. Typical Adjustment Range of the Receive Gain Figure 15. Typical AGA Characteristic 16 U4089B-P 4518A–CORD–05/02 U4089B-P Figure 16. Typical Load Characteristic of VB for a Maximum (RDC = infinity) DC Characteristic and a 3-mW Loudspeaker Output Figure 17. Typical Load Characteristic of VB for a Medium DC Characteristic (RDC = 130 kΩ) and a 3-mW Loudspeaker Output 17 4518A–CORD–05/02 Figure 18. Typical Load Characteristic of VB for a Minimum DC Characteristic (RDC = 68 kΩ) and a 3-mW Loudspeaker Output 18 U4089B-P 4518A–CORD–05/02 U4089B-P Figure 19. DC Voltage Absolute 44 GT GT RECIN open 1 42 DTMF TTXA 41 IDIO 68N CMIC S5 3 MIC2 CRIN 47N VL RGS CTXA 1U RGR GR 40 CH 68N RH 4 MIC1 RECO 39 100 IL S4 6 IND RNW2 7 VL STI 36 3K 8 GND 10 9 SENSE RSENSE s2a b IB c DC VB S1 CB VM 10U CIND RDC 10 VB VM 33 CM 100U IM RSAO 11 SAO 100K STO 32 open RREF IREF 31 62K RAGA AGA 30 CMP 4.7U 29 TLDT 28 CLDR 1N CLDT 1N 13 VMP RVMP 2MEG 2.2N 1.65K INLDR 27 2MEG DC ATAFS 25 20 IMPSEL GSA 22 + open RGSA CSACL 21 TSACL SAI 23 VMU TX RATAFS MUTX 24 + 1U 26 DC VIMPSEL 2.2N INLDT on adapter cause of stability TLDR 19 4518A–CORD–05/02 Figure 20. DC Voltage Current Test RGR GR 40 4 MIC1 RH RECO 39 STI 36 3K S6 8 GND s2 9 SENSE RSENSE 10 VB VM 33 CM 100U IM b 10 a CB S8 RNW2 ISTIHS VB DC VM 10U CIND IL 6 IND 7 VL + CH 68N 100 RDC S1 + RSAO ISTO 11 SAO + S12 STO 32 100K RREF IREF 31 VSTO DC CMIC 68N 3 MIC2 DC TTXA 41 CTXA 1U VTXA 1 DTMF CRIN 47N VM open 42 ITXA RECIN VL 44 GT GT ID C U7 S10 RGS 62K RAGA TLDT 28 CLDT 1N 13 VMP RVMP 2MEG 2.2N 1.65K INLDR 27 2MEG 2.2N INLDT 26 ATAFS 25 CSACL ISACL 21 TSACL SAI 23 GSA 22 open RGSA S4 1U 20 VSACL DC + IMPSEL + DC 20 + VMU TX RATAFS MUTX 24 IAGA CLDR 1N VAGA DC CMP 4.7U 29 on adapter cause of stability TLDR S5 AGA 30 U4089B-P 4518A–CORD–05/02 U4089B-P Figure 21. DC Ramps RGS 44 GT GT open 1 42 DTMF TTXA 41 VL CMIC 68N 3 MIC2 RGR GR 40 4 MIC1 RECO 39 CH 68N 100 RDC 10U CIND s4 s1 IL 6 IND RNW2 + VB 7 VL VM STI 36 3K 8 GND 10 9 SENSE RSENSE s2 a b DC CTXA 1U RH + DC CRIN 47N VL RECIN CB VM 33 CM 100U IM 10 VB RSAO a S4 11 SAO STO 32 b 100K offen + ILCUR DC RREF IREF 31 62K RAGA AGA 30 TLDR 4.7U CLDT 1N 13 VMP s5 1.65K TLDT 28 CLDR 1N 2MEG + VMP DC 2.2N INLDR 27 2MEG ATAFS 25 MUTX 24 + 20 IMPSEL GSA 22 + offen RGSA 1U CSACL 21 TSACL SAI 23 RATAFS DC DC 26 VMU TX VIMPSEL 2.2N INLDT on adapter cause of stability CMP 4.7U 29 21 4518A–CORD–05/02 Figure 22. AC Tests RGS RECIN open 1 42 DTMF TTXA 41 VL CMIC 68N 3 MIC2 RGR GR 40 4 MIC1 RECO 39 CH 68N 100 RDC 6 IND RNW2 VB 7 VL VM 10U CIND s4 s1 IL STI 36 3K 10 a s2 9 RSENSE SENSE 10 VB CB VM 33 CM 100U IM b 8 GND IDC + DC CTXA 1U RH + DC CRIN 47N VL 44 GT GT RSAO a S4 11 SAO STO 32 b 100K open + ILCUR DC RREF IREF 31 62K RAGA AGA 30 29 4.7U TLDT 28 CLDT 1N 13 VMP s5 1.65K CLDR 1N 2MEG + VMP DC 2.2N INLDR 27 2MEG ATAFS 25 RATAFS DC + 20 IMPSEL GSA 22 open RGSA CSACL 1U SAI 23 + DC MUTX 24 21 TSACL 22 26 VMU TX VIMPSEL 2.2N INLDT on adapter cause of stability TLDR U4089B-P 4518A–CORD–05/02 U4089B-P Table 1. Typical Values of External Components (see Figure 23) Name Value Name Value Name Value Name Value C2 4.7 nF C16 47 µF R3 >68 kΩ R16 1 kΩ C3 10 µF C17 10 µF R4 10 kΩ R17 1.2 kΩ C4 220 µF C18 10 µF R6 62 kΩ R18 30 kΩ C5 47 µF C21 1 µF R8 22 kΩ R21 15 kΩ C7 1 µF C23 6.8 nF R9 330 kΩ R22 330 kΩ C8 100 µF C24 10 nF R10 3 kΩ R23 220 kΩ C10 150 nF C25 100 nF R11 62 kΩ R24 68 kΩ C11 68 nF C26 470 nF R12 30 kΩ R25 2 kΩ C12 33 nF C27 33 nF R13 62 kΩ R26 3.3 kΩ C14 100 nF C28 10 µF R14 120 kΩ R29 1 kΩ C15 1 µF R2 20 kΩ R15 47 kΩ R30 12 kΩ 23 4518A–CORD–05/02 DTMF 24 C 26 C 27 R 16 R 17 Loud speaker LOGTX RECO R 22 R 23 R 29 R 30 C 25 Micro- R 14 C 14 C 15 C 16 C 17 C 18 C 21 phone R 18 R 15 C 24 R 26 23 21 11 25 28 29 26 27 22 44 41 1 3 4 R 13 R1 32 R 12 C2 24 7 13 V 30 Earpiece 39 R2 C3 6 C 28 R3 9 R 11 40 U4089B-P VM R 24 HF-Mic C 23 R 25 VM R 10 R4 10 to pin 32 VM VL 8 VM VM R8 36 33 C8 C 11 R9 3 C5 C 12 C4 C 10 LOGTX 42 29 31 R6 R 21 BC177 VB Micro controller hook switch V MP Ring C7 Tip Figure 23. Application for Hands-free Operation U4089B-P 4518A–CORD–05/02 U4089B-P Ordering Information Extended Type Number Package Remarks U4089B-PFN SSO44 Tubes U4089B-PFNG3 SSO44 Taped and reeled Package Information 9.15 8.65 Package SSO44 Dimensions in mm 18.05 17.80 7.50 7.30 2.35 0.3 0.25 0.10 0.8 16.8 44 0.25 10.50 10.20 23 technical drawings according to DIN specifications 1 22 25 4518A–CORD–05/02 Atmel Headquarters Atmel Operations &RUSRUDWH+HDGTXDUWHUV 0HPRU\ 2325 Orchard Parkway San Jose, CA 95131 TEL 1(408) 441-0311 FAX 1(408) 487-2600 (XURSH Atmel Sarl Route des Arsenaux 41 Case Postale 80 CH-1705 Fribourg Switzerland TEL (41) 26-426-5555 FAX (41) 26-426-5500 $VLD Room 1219 Chinachem Golden Plaza 77 Mody Road Tsimhatsui East Kowloon Hong Kong TEL (852) 2721-9778 FAX (852) 2722-1369 -DSDQ 9F, Tonetsu Shinkawa Bldg. 1-24-8 Shinkawa Chuo-ku, Tokyo 104-0033 Japan TEL (81) 3-3523-3551 FAX (81) 3-3523-7581 2325 Orchard Parkway San Jose, CA 95131 TEL 1(408) 441-0311 FAX 1(408) 436-4314 5)$XWRPRWLYH Theresienstrasse 2 Postfach 3535 74025 Heilbronn, Germany TEL (49) 71-31-67-0 FAX (49) 71-31-67-2340 0LFURFRQWUROOHUV 2325 Orchard Parkway San Jose, CA 95131 TEL 1(408) 441-0311 FAX 1(408) 436-4314 La Chantrerie BP 70602 44306 Nantes Cedex 3, France TEL (33) 2-40-18-18-18 FAX (33) 2-40-18-19-60 $6,&$6636PDUW&DUGV Zone Industrielle 13106 Rousset Cedex, France TEL (33) 4-42-53-60-00 FAX (33) 4-42-53-60-01 1150 East Cheyenne Mtn. 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